Paul
Posted a lot
Posts: 1,907
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Oct 26, 2021 16:14:58 GMT
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Hi all,
As above, really...just picked up a 1996 Hijet (1.0 fuel injected), 50k on the clock.
Drove fine on test, and for the first 20 minutes of the trip home when, upon putting the foot to the floor, it had no power and started misfiring, even backfiring out of the exhaust. Very gentle feathering of the throttle got me home, and I even saw 55mph with careful use of gears!
Back home I swapped out the air filter and spark plugs (which looked black and wet and stank of fuel so assuming rich running). I've ordered new HT leads and a fuel filter too.
Symptoms remain, even on the driveway. Floor the gas pedal and it starts popping and banging, nearly cutting out. No money light on the dash.
I know the thermostat is FUBAR, but it looks like I'll have to drop the engine to access it. Dunno if it's related, thought I'd mention.
Anywhere else I should be looking?
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Oct 26, 2021 16:18:00 GMT
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Pump working ok? Any smoke?
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Oct 26, 2021 17:30:55 GMT
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That might be low fuel pressure/flow, i've had cars before where something gets blocked (fuel filter, tank pick up etc.) and it restricts the flow of fuel causing issues.
If its like it all the time now that will make diagnosis easier, can yo code read it to see what the fault is? Some older cars could give you codes by flashing a light on the dash.
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Oct 26, 2021 18:06:35 GMT
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Have a good look for airleaks between the engine and air flow meter, I had a similar issue on a sierra (also on collecting it) turned out a breather hose had dropped off.
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Paul
Posted a lot
Posts: 1,907
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Oct 26, 2021 18:29:39 GMT
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That might be low fuel pressure/flow, i've had cars before where something gets blocked (fuel filter, tank pick up etc.) and it restricts the flow of fuel causing issues. If its like it all the time now that will make diagnosis easier, can yo code read it to see what the fault is? Some older cars could give you codes by flashing a light on the dash. There's a way of reading faults by bridging a diagnostic port somewhere...I'll investigate tomorrow 🙂 Definitely seems fuelling related... |
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93fxdl
Posted a lot
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Posts: 2,000
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Oct 26, 2021 19:48:20 GMT
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Fuel filter? blocked tank breather? ignition breaking down?
As said before, air leaks
Ttfn Glenn
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Paul
Posted a lot
Posts: 1,907
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Oct 30, 2021 13:16:17 GMT
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So a quick update:
New plugs and leads
New thermostat and fresh coolang
New fuel filter
Gallon of fresh fuel.
Same issue. Will bounce off the limiter when standing still, but try and take it out and move through the gears it bogs down, gas pedal does nothing, and has actually died on me a couple of times trying to navigate around my estate. So if anything it's worse than before...
What's the best way to test the fuel pump? They're practically unobtanium now otherwise I'd just fire the parts cannon at one 😕
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Last Edit: Oct 30, 2021 13:17:10 GMT by Paul
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Oct 30, 2021 17:54:17 GMT
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Check the fuel pump by either installing a gauge or removing a feed pipe and seeing what the flow is like. An inline pump will suffice.
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Oct 30, 2021 18:52:17 GMT
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So a quick update: New plugs and leads New thermostat and fresh coolang New fuel filter Gallon of fresh fuel. Same issue. Will bounce off the limiter when standing still, but try and take it out and move through the gears it bogs down, gas pedal does nothing, and has actually died on me a couple of times trying to navigate around my estate. So if anything it's worse than before... What's the best way to test the fuel pump? They're practically unobtanium now otherwise I'd just fire the parts cannon at one 😕 When you say the pumps are unobtainable, what type are they, are they inside the tank or an external unit?
If it is the pump when you test it then you should be able to rig something up with an aftermarket generic pump, even if you have to modify the intank pump unit (if thats what it is) so that it just becomes a fuel pickup pipe.
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Paul
Posted a lot
Posts: 1,907
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Oct 30, 2021 19:51:06 GMT
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So a quick update: New plugs and leads New thermostat and fresh coolang New fuel filter Gallon of fresh fuel. Same issue. Will bounce off the limiter when standing still, but try and take it out and move through the gears it bogs down, gas pedal does nothing, and has actually died on me a couple of times trying to navigate around my estate. So if anything it's worse than before... What's the best way to test the fuel pump? They're practically unobtanium now otherwise I'd just fire the parts cannon at one 😕 When you say the pumps are unobtainable, what type are they, are they inside the tank or an external unit? If it is the pump when you test it then you should be able to rig something up with an aftermarket generic pump, even if you have to modify the intank pump unit (if thats what it is) so that it just becomes a fuel pickup pipe.
Yeah that's what I was thinking...I've spent the afternoon searching Google images and it very much looks like a generic 12v pump should fit. So I've ordered one on Amazon Prime (there ain't much you can't get on there it seems) for about £20 with good reviews. Tomorrow I'll drain the tank (if what's in there is anything like what came out of the filter then it can only be a good thing), drop it, pull the OEM pump and see what's what. If I can't make it fit then I can just return it anyway. To be continued... |
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Paul
Posted a lot
Posts: 1,907
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Oct 30, 2021 19:52:08 GMT
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Check the fuel pump by either installing a gauge or removing a feed pipe and seeing what the flow is like. An inline pump will suffice. This is plan B if I can't replace the one in the tank - thanks! |
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Oct 31, 2021 10:06:27 GMT
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Early on you said the plugs were black an wet with fuel. Doesn’t sound like a lack of fuel to me. Also the backfiring, that’s unburnt fuel lighting off in the exhaust….. again not lack of fuel.
So from what I can see it’s either tipping on too much fuel at high loads and putting the fire out or there is (still) an ignition problem. As it apparently runs ok unloaded I’m inclined to think the former…
How does the ECU get its load signal? Air flow meter? MAP sensor? Is the air filter clean and dry?
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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jimi
Club Retro Rides Member
Posts: 1,823 
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Last Edit: Nov 4, 2021 1:44:42 GMT by jimi
Black is not a colour ! .... Its the absence of colour
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Paul
Posted a lot
Posts: 1,907
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I'm sure there is a diagnostic port somewhere (apparently on a Hijet it's only 4 pins) but I'll be damned if I can find it... Current state of play is awaiting a new throttle position sensor from Hong Kong 🤞 |
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alx
Club Retro Rides Member
Posts: 367
Club RR Member Number: 21
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Paul
Posted a lot
Posts: 1,907
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I'd seen that link...can't find it under my dash. The issue is more to do with being old and normal sized...it's being able to see under there that's the main problem in the first place. If I'm feeling particularly flexible over the weekend I'll have another look, or start stripping out the dashboard  |
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toe
Part of things
Posts: 78
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I'm assuming it's a CB42 engine?
You've already done one but 2 things similar happened to my '98 1 litre, 1st one was a loose spark plug lead and 2nd was a dodgy coolant temperature sender but that created a check engine light, don't know where the connector is though as it was diagnosed by a dealer!
Got part of the manual and have a parts catalogue but no joy as you say with pump although my Charade 1 litre can have many varieties of pump as long as it fits
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1990 Daihatsu Charade GTti,
1992 Saab 900 T16s
1998 Mazda 323f ZXi
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Paul
Posted a lot
Posts: 1,907
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I'm assuming it's a CB42 engine? You've already done one but 2 things similar happened to my '98 1 litre, 1st one was a loose spark plug lead and 2nd was a dodgy coolant temperature sender but that created a check engine light, don't know where the connector is though as it was diagnosed by a dealer! Got part of the manual and have a parts catalogue but no joy as you say with pump although my Charade 1 litre can have many varieties of pump as long as it fits Correct - CB42 lump. The coolant temp sender is also on the list of possibilities - the gauge never got above 1/3 of the way up when driving it home. I assumed faulty thermostat. It also looks like it's been recently replaced, so perhaps someone's been fault chasing in the past. Idle screw on the throttle body was wound all the way in, lowering the idle so it sounded normal. Wound out to where it should be the idle started racing away, which is making me suspect throttle position. |
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toe
Part of things
Posts: 78
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Hmmm, here's hoping that is the fault and not one of many faults, been there done it lol
No doubt you also know what a sod they are to bleed and get the cooling system sorted so it's working well, I was lucky, no head gasket issues or overheating and tbh I think they are easy to work on, sure the engine is on the huh lol but changing the cam belt was a breeze compared to my Charade.
I have a troubleshooting guide to the CB80 in my Charade but it's a turbo twin cam so whilst many parts are the same I don't know if the nitty gritty stuff is, all it does say is
Checking spark plugs/leads,
Checking throttle position sensor,
Checking coolant temp sensor,
Checking fuel system amongst other things...
Do have a thought though, is the throttle cable ok, it's suggested in the guide and with you screwing it out to where it is now is way too fast and this must be messing around with the ECU readings,
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Last Edit: Nov 6, 2021 17:58:28 GMT by toe
1990 Daihatsu Charade GTti,
1992 Saab 900 T16s
1998 Mazda 323f ZXi
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Paul
Posted a lot
Posts: 1,907
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Nov 18, 2021 21:29:59 GMT
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So I ordered a new throttle position sensor, waited nearly 3 weeks for it to arrive and guess what? Made no difference. In my stupidity I did not double check the basics...popped the distributor cap and found this mess   Can I find a new one anywhere? Can I hell. They're listed on Autodoc for as little as a fiver, but OOS everywhere. Going to do my best to clean this one up for now (any tips?) and see if it makes a difference. 😡 |
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