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Seems strange that it just went like that after being test-driven previously with no issues. Still, as you say, stale fuel and a combination of other factors could certainly cause this. If plugs, leads, oil & filter don't work, MAF sensor might be worth a look. Good luck!! I guess 9t is a bit by bit approach here, so hopefully stuff getting seen to, and eventually eliminating the potential problem. These guys aslo seem to suggest the Trottle Body may need cleaning: linkGreat stuff, thank you for picking that up, I see it is a 2009 post, shows you, the info is all out there. Spark plug leads caused similar issues on my Mk1. Lets see where the bits I bought yesterday takes us. Seems strange that it just went like that after being test-driven previously with no issues. Still, as you say, stale fuel and a combination of other factors could certainly cause this. If plugs, leads, oil & filter don't work, MAF sensor might be worth a look. Good luck!! That's what made me think of plug leads, it's got warmer and damp around here in the last few days. I started and ran it a bit in the dark last night, the rings on the headlights are ignition wired, so come on automatically as DRL’s so not complete darkness. I could not see any arcing or strange actions in the engine bay while looking in there, either at idle or revving it up. It seems to want to hunt for something, could it be that it is just trying tomfind itself some sort of “normal range” to operate in? I did a short video of it running in the dark, hoping to,capture any arcs or sparks, nothing, but it did a bit of the hunting. |
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MAF needs cleaning or replacing ?
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"It seems to want to hunt for something, could it be that it is just trying tomfind itself some sort of “normal range” to operate in?"
Throttle Body needs cleaning - clutch and brake cleaner spray and a tooth brush, don't forget to clean the edge of the butterfly as well ...
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Last Edit: Feb 12, 2023 10:11:11 GMT by westbay
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Feb 12, 2023 12:09:06 GMT
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The plug leads do go on them, run it up at night and see if you can see any arcing. For those who know. Leads are cheap enough, starting at at around £20.00 a set, delivered (in Red) These are claimed to be double silicone and 8mm I also saw some being 7mm and weirdly think the originals may be,6mm (but I could be wrong) Do not judge me for my questions as this is not my backyard……. Would the 8mm option be the better option of them all? . So this afternoon nickwheeler popped in for a few hours to chat and drop off the RivNut tool so that I can refit the passenger screen wiper. We chatted about a load of stuff, including the permutations of building “Le Lunatic” forum.retro-rides.org/thread/224087/numbers-add-mx7cv-meet-lunaticBack to the Rezin Rockit running like poo, it was due a service at some point before or after MOT. Maybe all the turning it on and off, not running for 4 years at least and stale fuel all came together to create this little mess……. . So I went down to Euro Carparts to fetch a few basic bits after inspecting the airfilter and trying to find just where the oil filter lives. Did you think it was easy ? Nope, but YouTube university showed me,,small, black, hidden in the most awkward space. Found it.  Needs a special tool, on an extension it seems to get it unstuck. Would be interesting to know when last, if ever this was changed.  Air filter has certainly seen better day as well. Camera does not quite capture just how grubby and filled with muck it is.   So,£63.00 later. Oil, filters, spark plugs and an oil drain plug And as advised by kevins and mk2cossie suggested, sparkplug leads could be degenerated and part of the problem.  Here’s to hoping that it works out on the new parts. Fingers crossed. MAF needs cleaning or replacing ? No idea yet. Starting with basic service items. "It seems to want to hunt for something, could it be that it is just trying tomfind itself some sort of “normal range” to operate in?" Throttle Body needs cleaning - clutch and brake cleaner spray and a tooth brush, don't forget to clean the edge of the butterfly as well ... May go there next, suspect it needs it, having looked at the airfilter that is a serious mess right now. Looking like it has competed in the Safari Rally. Its wet n drizzly outside and I am still coughing quite a bit, despite my heart wanting to go start on it, my head says I have work tomorrow and best I do not challenge the effect of Covid on the respiratory system. So I may just leave it alone. My other biggest fear of course is access to the oil filter, which is small and tucked away. Having once needed to address an oil filter with a screwdriver, it has left an indelible scar on my confidence and I do not need this thing to fight me once the car is up on ramps and axle stands. . |
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Last Edit: Feb 12, 2023 12:10:38 GMT by grizz
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Feb 12, 2023 13:11:44 GMT
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'Bigger' plug leads won't do anything better than stock ones in good condition. All they do is give you a nice warm empty wallet. There are far more worthwhile ways of achieving that.
The air filter is worse than I remember and needs to be replaced, but it won't be the cause of your issues. The throttle body gets in that state due to oil from the block breather. Cleaning both and the pipework is probably a good idea. Check for air leaks on all the intake joints - a squirt of the remaining carb cleaner will do that.
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dan91
Part of things
Posts: 418
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Feb 12, 2023 18:43:32 GMT
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Mx5's can be funny with leads also, cheaper ebay versions wont last/will run like curse word, i know this from experience. I'd get them from mx5parts to be honest, they're reputable. www.mx5parts.co.uk/I don't know how much of your resin rocket is Mx5 but first port of call for me would be Cam angle sensor, known to be a bit hit and miss on the 5's sometimes, depending on what engine you have i might actually have a spare for you? Also if you need any mx5 bits poke me, i have an ungodly amount of spare parts currently. if i have it and its not needed by me its yours for the price of postage sir. Edit: Just watched your latest video, id also consider the coil pack itself, they're known to fail/be intermittent. Again i may have a spasre if you can identify which one you have. Also check for vacuum leaks, may be just me but i thought i could hear an air leak on the video once you started it up after the service. |
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Last Edit: Feb 12, 2023 18:48:32 GMT by dan91
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Feb 12, 2023 19:12:49 GMT
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'Bigger' plug leads won't do anything better than stock ones in good condition. All they do is give you a nice warm empty wallet. There are far more worthwhile ways of achieving that. The air filter is worse than I remember and needs to be replaced, but it won't be the cause of your issues. The throttle body gets in that state due to oil from the block breather. Cleaning both and the pipework is probably a good idea. Check for air leaks on all the intake joints - a squirt of the remaining carb cleaner will do that. I guess there will be more and more bits exposing themselves as I dig deeper. |
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Feb 12, 2023 19:22:35 GMT
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Mx5's can be funny with leads also, cheaper ebay versions wont last/will run like curse word, i know this from experience. I'd get them from mx5parts to be honest, they're reputable. www.mx5parts.co.uk/I don't know how much of your resin rocket is Mx5 but first port of call for me would be Cam angle sensor, known to be a bit hit and miss on the 5's sometimes, depending on what engine you have i might actually have a spare for you? Also if you need any mx5 bits poke me, i have an ungodly amount of spare parts currently. if i have it and its not needed by me its yours for the price of postage sir. Edit: Just watched your latest video, id also consider the coil pack itself, they're known to fail/be intermittent. Again i may have a spasre if you can identify which one you have. Also check for vacuum leaks, may be just me but i thought i could hear an air leak on the video once you started it up after the service. Hi Dan, Thank you for the advice and offer of parts. Funny how it works, when I had “my” Mk1 1600 for Nicola years ago, I bought and amassed a load of spares, thinking it was going to be a long term thing, alas not. I gave away and actually even stopped a “local” guy who lives in Sallys village once to give him rear lights, centre console and other parts I still had. I know too little to even start identifying things that are wrong, let alone know half the bits you mention. However, to answer your question….. a load of the MX5 is in the jeep. And you could be right regarding vacuum leaks, the airbox was relocated quite a way, using some gutter pipe etc, not sealed in place, just tucked into a grommet. Things like the coil pack are dark arts to me when you say they differ. |
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Feb 12, 2023 19:38:07 GMT
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So a quick photo report of today. I was not planning on going out as it was damp, 8’C and intermittent drizzle rain. Covid can be quite unforgiving, but stuck indoors pretty much for 8 days was getting to me. So I went down, spares in hand. Got the car up in the air.  Changed some parts around. Air filter.  Oil, oil filter changed. Filter put up a bit of a fight, but not as bad as one years ago that ended up skewered with a screwdriver. Oil was terrible and thick.    Plugs changed, old ones seemed decent to be honest. But what do I know.  Old vs new.  Made a video of the proceedings, including the engine running afterwards. VIDEO. After closing shop, showering and chatting with Anthony the lodger for a bit, I fed George and came over to Sally’s She offered to make us dinner, I declined, insisting on a kebab and chips with chilli sauce and garlic sauce. The Turkish guys who run the shop always are so nice. These were ordered as “Small” not sure what a large would look like.   Back home, there were more chips, and I had ordered a single small portion.  Dinner was good, and I have enough left for tomorrow night. Still need more investigating to get this all right, and the clutch is not engaging well, so may need some modification or further adjustment. Very lazy weekend with Covid slowing me right down, but a few small jobs done. Weekend over, just like that. |
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brachunky
Scotland
Posts: 1,339 
Club RR Member Number: 72
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Feb 12, 2023 21:40:04 GMT
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Well it's not a race bud so slowing down ain't bad. Enjoy the challenge and use the CV19 down time to research & plan. The Rezin Rocket has had me looking the net for a future project too although that would be after the Hijet is going!
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dan91
Part of things
Posts: 418
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Feb 14, 2023 20:57:11 GMT
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Mx5's can be funny with leads also, cheaper ebay versions wont last/will run like curse word, i know this from experience. I'd get them from mx5parts to be honest, they're reputable. www.mx5parts.co.uk/I don't know how much of your resin rocket is Mx5 but first port of call for me would be Cam angle sensor, known to be a bit hit and miss on the 5's sometimes, depending on what engine you have i might actually have a spare for you? Also if you need any mx5 bits poke me, i have an ungodly amount of spare parts currently. if i have it and its not needed by me its yours for the price of postage sir. Edit: Just watched your latest video, id also consider the coil pack itself, they're known to fail/be intermittent. Again i may have a spasre if you can identify which one you have. Also check for vacuum leaks, may be just me but i thought i could hear an air leak on the video once you started it up after the service. Hi Dan, Thank you for the advice and offer of parts. Funny how it works, when I had “my” Mk1 1600 for Nicola years ago, I bought and amassed a load of spares, thinking it was going to be a long term thing, alas not. I gave away and actually even stopped a “local” guy who lives in Sallys village once to give him rear lights, centre console and other parts I still had. I know too little to even start identifying things that are wrong, let alone know half the bits you mention. However, to answer your question….. a load of the MX5 is in the jeep. And you could be right regarding vacuum leaks, the airbox was relocated quite a way, using some gutter pipe etc, not sealed in place, just tucked into a grommet. Things like the coil pack are dark arts to me when you say they differ. Hi Grizz, Not a problem, i have an odd obsession with MX5's and have learnt a bit over the years. Is your engine an early 1.6? basic terms, the 1.6 and 1.8 coil pack aren't interchangeable unfortunately, if i recall correctly all of the 1.6 engines used the same coil packs but the 1.8 mk1 used both what's known as a 3 pin and a 4 pin. The coil packs in general on the mk1 are weak, ive seen people say if you leave the ignition on for an extended period of time without the engine running it can cause them to go bad, how true this is i don't know but i know i've had a few fail/start to fail on some of my Mk1s and give similar symptoms to what i saw in your video! The Cam angle sensor can also be a bit iffy, however its more likely if thats going bad it would cause issues driving not just idling.. from my experience anyhow. It's located next to the coil packs, see below. There's a bolt in a slotted hole holding it in, the slotted hole lets you adjust timing. plenty of guides for that about   You often also get oil leaks from there as it uses an O-ring that wears out. Always worth changing the O-ring if the engine is ever out as its much easier, can be done with the engine in but fiddle as its often up against the bulkhead and will only go back in one orientation.. fiddle and annoying if you have bigger hands! If your service/general lookover hasnt solved it i would guess vacuum leaks or one of the two mentioned above is best place to look to begin with.. there's not a great deal that can go wrong and the parts are dirt cheap so shouldn't ever be an expensive fix! I have a Mk1 1.6 engine in bits in the shed so if you do need anything please don't hesitate to ask! I'm sure i have a spare coilpack/CAS that were working before so could be use for testing if needed, save you buying something new you don't need. |
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Well it's not a race bud so slowing down ain't bad. Enjoy the challenge and use the CV19 down time to research & plan. The Rezin Rocket has had me looking the net for a future project too although that would be after the Hijet is going! You are right, not a race, but I feel real bad if I do nothing all day. But this Covid thing tends to knacker you, even sitting still. Looking forward to what you get onto next. |
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Feb 15, 2023 10:05:37 GMT
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Hi Dan, Thank you for the advice and offer of parts. Funny how it works, when I had “my” Mk1 1600 for Nicola years ago, I bought and amassed a load of spares, thinking it was going to be a long term thing, alas not. I gave away and actually even stopped a “local” guy who lives in Sallys village once to give him rear lights, centre console and other parts I still had. I know too little to even start identifying things that are wrong, let alone know half the bits you mention. However, to answer your question….. a load of the MX5 is in the jeep. And you could be right regarding vacuum leaks, the airbox was relocated quite a way, using some gutter pipe etc, not sealed in place, just tucked into a grommet. Things like the coil pack are dark arts to me when you say they differ. Hi Grizz, Not a problem, i have an odd obsession with MX5's and have learnt a bit over the years. Is your engine an early 1.6? basic terms, the 1.6 and 1.8 coil pack aren't interchangeable unfortunately, if i recall correctly all of the 1.6 engines used the same coil packs but the 1.8 mk1 used both what's known as a 3 pin and a 4 pin. The coil packs in general on the mk1 are weak, ive seen people say if you leave the ignition on for an extended period of time without the engine running it can cause them to go bad, how true this is i don't know but i know i've had a few fail/start to fail on some of my Mk1s and give similar symptoms to what i saw in your video! The Cam angle sensor can also be a bit iffy, however its more likely if thats going bad it would cause issues driving not just idling.. from my experience anyhow. It's located next to the coil packs, see below. There's a bolt in a slotted hole holding it in, the slotted hole lets you adjust timing. plenty of guides for that about You often also get oil leaks from there as it uses an O-ring that wears out. Always worth changing the O-ring if the engine is ever out as its much easier, can be done with the engine in but fiddle as its often up against the bulkhead and will only go back in one orientation.. fiddle and annoying if you have bigger hands! If your service/general lookover hasnt solved it i would guess vacuum leaks or one of the two mentioned above is best place to look to begin with.. there's not a great deal that can go wrong and the parts are dirt cheap so shouldn't ever be an expensive fix! I have a Mk1 1.6 engine in bits in the shed so if you do need anything please don't hesitate to ask! I'm sure i have a spare coilpack/CAS that were working before so could be use for testing if needed, save you buying something new you don't need. Thank you Dan, Short PM sent to you. Thanks for the info, input and offer here. I need to get to nickwheeler again as the clutch actuator on the pedal, through to the master cylinder is a bit short, so getting slick shifts are not quite happening right now. I also need to let the motor run once I reconnect the battery, hopefully for the last time, so the brain can programme itself more accurately. |
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Feb 15, 2023 12:12:45 GMT
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In some sort of order:
the plugs you removed are knackered! Compare the crisp edges of the electrodes on the new ones to the rounded off old ones.
Bulkhead clearance isn't a problem on this installation.....
The intake plumbing is standard from the AFM into the engine; air between the filter and AFM won't affect how the engine runs. Checking the stuck on plug that blocks where the resonator was might be a good idea.
The clutch is a result of adapting the Ford pedal to the Mazda master cylinder, it could do with more travel, which is why it worked better before setting the pedal height. Just adjusting the pushrod won't help, so more engineering is required.
Checking the fuel pressure is easy to do, so is worth a go. The tank is new, and the inlet was inspected for damage etc before fitting the pump
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Nathan
Club Retro Rides Member
Posts: 5,650
Club RR Member Number: 1
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Feb 15, 2023 16:01:13 GMT
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The engine came out of an NB (Mk2) MX5 isn't it? So it doesn't have a CAS to adjust on the back of the rocker.
That cutting out can be due to air leaks and the fact it's hunting, it's worth checking the IACV under the throttle body as it has symptoms of that (a can of WD etc and spray it around the air hoses and see if the engine picks up).
There isn't much to go wrong on a BP motor, but they act all funny without a set amount of engine grounds (Been there done that with the MX powered MGB).
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Feb 17, 2023 21:14:28 GMT
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In some sort of order: the plugs you removed are knackered! Compare the crisp edges of the electrodes on the new ones to the rounded off old ones. Bulkhead clearance isn't a problem on this installation..... The intake plumbing is standard from the AFM into the engine; air between the filter and AFM won't affect how the engine runs. Checking the stuck on plug that blocks where the resonator was might be a good idea. The clutch is a result of adapting the Ford pedal to the Mazda master cylinder, it could do with more travel, which is why it worked better before setting the pedal height. Just adjusting the pushrod won't help, so more engineering is required. Checking the fuel pressure is easy to do, so is worth a go. The tank is new, and the inlet was inspected for damage etc before fitting the pump Agreed. Will check tomorrow. |
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Feb 17, 2023 21:16:09 GMT
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The engine came out of an NB (Mk2) MX5 isn't it? So it doesn't have a CAS to adjust on the back of the rocker. That cutting out can be due to air leaks and the fact it's hunting, it's worth checking the IACV under the throttle body as it has symptoms of that (a can of WD etc and spray it around the air hoses and see if the engine picks up). There isn't much to go wrong on a BP motor, but they act all funny without a set amount of engine grounds (Been there done that with the MX powered MGB). Cool, Thank you. Tomorrow may be the day for some digging around. |
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Feb 18, 2023 10:08:25 GMT
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For cleaning up throttle bodies etc as seen on YouTube Worth trying? Or just carb cleaner on MX5 throttle body ? Any real world experience with this product, or recommendations  |
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Feb 18, 2023 13:49:40 GMT
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The throttle body will clean with a squirt of whatever solvent you have to hand and some scrubbing with a toothbrush. Or a couple of squirts of carb cleaner if you're feeling extravagant. On a fuel injected engine, the crankcase breather ought to be the only source of anything that isn't fuel in the intake tract. The valves sit in plenty of oil, so don't need extra lubrication. If their stem seals are bad, then there will be extra oil getting into the combustion chamber and ports. Spraying magic gunk into the airfilter won't help any of this. If you have a desperate need to lose £15, send it to me. Used fivers in a brown envelope please  |
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Feb 18, 2023 14:36:30 GMT
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The throttle body will clean with a squirt of whatever solvent you have to hand and some scrubbing with a toothbrush. Or a couple of squirts of carb cleaner if you're feeling extravagant. On a fuel injected engine, the crankcase breather ought to be the only source of anything that isn't fuel in the intake tract. The valves sit in plenty of oil, so don't need extra lubrication. If their stem seals are bad, then there will be extra oil getting into the combustion chamber and ports. Spraying magic gunk into the airfilter won't help any of this. If you have a desperate need to lose £15, send it to me. Used fivers in a brown envelope please Rain interrupted play. But I managed to clean the TB a bit and then ran the motor 20 minutes. Video and write up to follow. £15.00 not spent, so tucked safely back in the wallet. Thought I had a few cans of carb cleaner, but seems it is a few cans of brake cleaner and one used can of carb cleaner. |
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