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1995 I.8 Monotronic ABD engine Golf, Recnetly at idle the the engine is very slightly rough, runs well, new leads plugs, cap rotor, fuel cleaner. The same. So I am down to an air leak. Just spent 2 hours chaecking all the pipe work, operation of the purge valve and Carbon can an can find a leak anywhere. Purge valve resistance is 43 ohms and appying 12 volts it operates and opens the valve allowing air through the can into the inlet manifold. small ridged black pipe allows air in one direction i.e. you can blow but not suck, and the click sounds healthy and the feed pipe down to the can when applying suction clunks closed with no leaks. Had to give up as I am outside today and it's started to snow.. Any ideas, the other clue it only does it when the engine is hot until it is reasonable warm you would not detect the proplem. Regards Peter
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Further, by recoding the exhaust note and replaying it digitally on the PC and using time domaim analysis it is clearly quite random which cylinder if effected the miss it slight and I think it is a weak mixture at idle. I may try a gas analysis tomorrow. Regards Peter
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Have you checked that the battery terminals are clean and bright and the leads tightly connected?
My Bora started to idle roughly or cut out recently and that was the cause. Because we had had such a mild winter I didn't clean them early enough, especially as starting is normally first time.
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What\'s for you won\'t pass you by
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I've check all the manifold gaskets and throttle body flexi mount ( new 3 years ago ) sprayed everthing with carb clener whilst running all the normal tricks, nothing. Any ideas anyone.
You Bora was sorted because you disconnected the battery thus resetting the ECU and the thottle idle servo motor.
Regards Peter
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It could be that the Lamda prob is failing and it is running rich, the other symptoms of that are running much smoother and quieter at 80 and higher than normal fuel consumption. If it is the Lamda probe: i reccoment a genuine spare, the pattern parts commonly have a short lifetime.
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>>You Bora was sorted because you disconnected the battery thus resetting the ECU and the thottle idle servo motor.>>
That's interesting. However, the terminals did have that dull appearance indicating there would be resistance despite having been smeared with petroleum jelly.
But hopefully I now know the real reason, although this was the first time it had occurred.
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What\'s for you won\'t pass you by
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Mark25 Thanks for that good idea, do you know what the output of the Lambda sensor should be like and the response time This model is fitted with a single wire unheated sensor in the manifold. I had overlooked this as a possible cause as the car runs very well off tickover and normal fuel consumption.
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A single wire sensor relies on earthing thro' the exhaust system and/or manifold;not designed to be reliable.
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Mark25 Thanks for that good idea, do you know what the output of the Lambda sensor should be like and the response time This model is fitted with a single wire unheated sensor in the manifold. I had overlooked this as a possible cause as the car runs very well off tickover and normal fuel consumption.
I don't know the output chrachteristics of the probe. But i do know there are sometimes problems with the probe electrical connection, due to corrosion, etc. It's worth having a good look at the electrical connection, and the associated wire. I'm not sure how well the wire is insulated from the elements there, but the capilary action at the wire end near the probe will be increased due to the large temperature changes near the probe. Worth a look corrosion inside the cable if there's nothing else obvious IMO.
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The car does not have an emissions Lambda =1.000 and all clean so even more of a mystery. I might be chasing a failing Hall effect in the dizzy but it is very predicable at what temp the slight lumpyness at tick over starts. Regards Peter
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have you checked the coolant temp sender? not just resistance between the terminals, but also leakage ohms to the block/coolant?
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