street
Posted a lot
6.2 ft/lbs of talk
Posts: 4,662
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Yep, but i've made sure they're back on I've had a good look to make sure I havent disturbed anything, and theres no plugs or pipes dislodged from what I can see. This is typical of my sort of 'modifying', one step forwards, one tram ride backwards
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MWF
Posted a lot
Posts: 2,945
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Try dissconnecting the battery for an hour.
If it's still a problem look the airflow meter and make sure nothing is blocking it.
Also check the idle control valve.
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Hmmmmm. Have you been running the car plenty? Just wondering if it may not be just a coincidence and it just needs a bit of a run? The fuel system it runs seems a bit of a minefield... according to my Googling these are the fuel systems it could be running.... Rover Montego EFi 2 litre 90 Lucas AB17 Rover Montego EFi 2 litre 84-89 Lucas AB17 Rover Montego EFi 2 litre 89-92 Motorola MEMS MPi Rover Montego EFi 2 litre 84-87 Lucas 11CU Rover Montego EFi 2 litre 90 Lucas 14CU Rover Montego EFi 2 litre 86-91 Lucas 11CU Rover Montego EFi 2 litre Auto 87-89 Lucas 11CU ...nice to know they kept things simple.
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MWF
Posted a lot
Posts: 2,945
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May 19, 2006 10:32:54 GMT
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It certainly sounds like something has been unintentionally knocked or adjusted. With it smoking my insticts scream breather related. On my Volvo I actually thought I'd knackered the turbo after what was simply knocking sludge out the breather airbox valve.
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street
Posted a lot
6.2 ft/lbs of talk
Posts: 4,662
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May 19, 2006 14:32:44 GMT
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Cheers! Had a look at the breathers, gave them a clean out and cut of some split end bits, but no different. I'm starting to think the problem isnt related to anything i've been doing- No I havent really ran the car anywhere, just kept starting it up and whizzed it round the block once on the day I baught it, so it could just be that. gonna whizz the plugs out as i'm suspecting no1 cylinder is at fault, maybe the spark plugs just need a jolly good clean, we'll see!
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May 19, 2006 15:08:03 GMT
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It might be unrelated but that sounds pretty similar to when my brother in law fitted a K&N 57i to his mg maestro. Low idle, hesitant throttle response and missing at low revs. The adjustable fuel regulator helped matters and gave it more top end but it still had less torque than before so he ended up ditching the lot and going back to the standard setup.
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MWF
Posted a lot
Posts: 2,945
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May 19, 2006 15:33:41 GMT
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Have you tried disconnecting the battery for an hour or so?
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street
Posted a lot
6.2 ft/lbs of talk
Posts: 4,662
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May 19, 2006 16:17:44 GMT
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Have you tried disconnecting the battery for an hour or so? No I forgot that bit, i'll go and do it now. What will it do for it? PhoenixC- Thats worrying, but if I sort of restrict the intake agin temporarily with my hand, would it run correctly if the intake mods are causing the problem? Appreciating your guidence fellas
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Reynolds501
Part of things
Volvos, they're boxy, but good.
Posts: 368
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May 19, 2006 16:44:27 GMT
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Hey dude, Sorry to hear about the strange running maladies! the air bleed is on the top of the throttle body and is recessed in a small 'tunnel' and faces out sideways, you would really need to have a gas analyer on hand before effecting any adjustments though, but as long as you can remember where the start point was, it wouldn't hurt to have a twiddle with it to see if matters can be improved. Another thing, as far as my memory will allow (which ain't far, trust me!) there were two small bore vaccuum pipes one ran from the manifold to the airbox, and the other to a brass spigot on top of the throttle body, it's worth checking these are properly connected and not suffering any splits, a problem with these can make the car run like you described. Also check the very small bore plastic pipe that runs between the ECU in the engine bay and the manifold, the small rubbery plastic connectors at each end are prone to splitting with age and heat exposure, but can look perfectly fine, have a good listen for any unusual hissing/wheezing noises. Also worth checking is the small length of rubber pipe from the regulator to the manifold, this can also split, giving rise to apparently unexplained running porblems. Not directly related, but also make sure the three wires to the throttle pot on the body are connected, one of these broken can also cause loss of power and hesitantcy/misfire, been there, done that Also check that the air by-pass stepper motor is functioning, you will hear it grumble quietly to it's self on turning the ignition on and off, however, sometimes it's good to give the entire throttle body and stepper motor a good clean with carb cleaner as things can get a bit gummed up in there aswell. If I can think of anything else, I'll post it up ASAP. Any time about the M16 brain picking fella, I'd say when you get the chance, go for it, you wouldn't regret it if you did! ;D
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May 21, 2006 14:35:02 GMT
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since you've just about increased the diameter of every pipe leading to the throttle you could expect a lower velocity of air flow which would account for the low idle. it might play silly buggers with your airflow sensor too, hesitation and misfire would suggest running lean right? this is the problem with messing around with manufacturers designs, there's always a drawback...
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1986 Audi Coupe quattro
you need only two things in life: WD40 and duck tape. if it moves and it shouldn't use the duck tape, if it doesn't move but should then use the WD40. Genius!
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May 21, 2006 17:31:34 GMT
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I'm not sure these cars have an airflow meter - I remember searching for one on my Rover 420 and failing to find it. I think they must calculate the airflow from the eng speed + throttle position or the manifold vacuum.
If I was in your shoes street the first thing i'd do is take off the throttle body and clean it inside and out, loads of injection worries seem to be related to the butterfly getting a build-up of sh1te on it then not seating properly and messing up the idle.
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1972 Fiat 130 1985 Talbot Alpine 1974 Lancia Beta Saloon 1975 + 1986 Mazda 929 Koop + Wagon 1982 Fiat Argenta 2.0 iniezione elettronica 1977 Toyota Carina TA14 BEST CAR EVER!!!!!!!! 1979 Datsun B310 Sunny 4-dr 1984 Audi 200 Quattro Turbo 1983 Honda Accord 1.6 DX GONE1989 Alfa 75 2.0 TS Mr T says: TREAT YO MOTHER RIGHT!
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MWF
Posted a lot
Posts: 2,945
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May 21, 2006 18:37:11 GMT
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I'm confident it either has a flap based air mass meter or hotwire air mass sensor as there appears to be one here on the top left: And here at the top Can't argue with a bit of throttle body cleaning.
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May 21, 2006 22:46:15 GMT
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if it doesn't have an air flow sensor then that would be your problem. its now predicting an inaccurate air flow, its probably most likely running lean. if it does have one then find it and see if its adjustable. although i could be sprouting complete bull-poopoo as i know nothing about these cars.
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1986 Audi Coupe quattro
you need only two things in life: WD40 and duck tape. if it moves and it shouldn't use the duck tape, if it doesn't move but should then use the WD40. Genius!
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May 21, 2006 22:53:38 GMT
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It seems that earlier MG montys with the separate fuel and ignition ECU's, do have an airflow meter. But later ones with an MEMS set up do not. I haven't a clue what set-up this one has got. If it has a silver ECU in the engine bay then its MEMS, if its a black plastic one its the older two-box set-up.
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1972 Fiat 130 1985 Talbot Alpine 1974 Lancia Beta Saloon 1975 + 1986 Mazda 929 Koop + Wagon 1982 Fiat Argenta 2.0 iniezione elettronica 1977 Toyota Carina TA14 BEST CAR EVER!!!!!!!! 1979 Datsun B310 Sunny 4-dr 1984 Audi 200 Quattro Turbo 1983 Honda Accord 1.6 DX GONE1989 Alfa 75 2.0 TS Mr T says: TREAT YO MOTHER RIGHT!
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Reynolds501
Part of things
Volvos, they're boxy, but good.
Posts: 368
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May 23, 2006 11:02:29 GMT
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If it has an air flow meter, it's definitely Lucas. The air flow meter uses a resistive wire system (Lucas 'Hotwire' as pointed out by MWF), and for the kill, the flow meter is actually made by Hitachi! ;D I still don't think the increase in airflow made should be making things so difficult, my car just had a dirty (well, clean) great cone filter directly on the flow meter with big cold air feed, the management system coped perfectly well, we also fitted the same type of filter to my mate's MG Maestro and another mate's M16 Montego, and again, they worked very well. Bit puzzling this! Have you had a chance to have a poke around in the engine bay since fella?
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May 23, 2006 11:29:34 GMT
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If the hotwire AF sensor is all gunked up it can affect the running of the engine, as it'll be chucking in more fuel than necessary. A careful wipe with some spirits on a soft cloth should clean it off. Hope you get this sorted - did you check the state of the plugs? Should be able to tell the basic state of the engine from the colour...
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MWF
Posted a lot
Posts: 2,945
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May 23, 2006 11:37:16 GMT
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If the hotwire AF sensor is all gunked up it can affect the running of the engine, as it'll be chucking in more fuel than necessary. Yes I'd certainly have a look in there. There's a chance the sensor may have been jolted by taking the airbox off and something has fallen in there. Or something has been sucked in.
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