Erratic idle at start-up on a JTD and flatspot - Alfa Romeo Forum
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Erratic idle at start-up on a JTD and flatspot

Any ideas?

Ok when warm, but on start up the idle has started to fluctuate....only by a hundred or so revs...but it's annoying.

Also still got a major flatspot at 3-4k revs unless I just floor it.

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Re: Erratic idle at start-up on a JTD and flatspot

Two places to look on a diesel, the Turbo wastgate sticking open or shut or partway, or injectors. In the case of common rail diesel's in their control systems too.

Something is telling it to feed too much, or it is not being boosted enough on part throttle - sounds like too much fuel in any case. If the exhaust has a tendancy to be smoky, i.e. you can smell unburnt diesel that would confirm an injector.

Diesel's do the same as petrol's if they are being improperly fuelled - they cant hold a smooth rpm.

It could be as simple as an injector not having the right electrical resistance so the ECU thinks it is doing right but is in fact overfuelling.

An analyser should tell all, but i would be surprised if it wasn't a slight injector problem.

Good luck finding the problem

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Re: Erratic idle at start-up on a JTD and flatspot

Oh dear...sounds like it will be a struggle.....just been under the bonnet to check the black puddles under the car are mucky water and not some leak and noticed the AFM has come unplugged Hopefully this may be the cause of the problem problem


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erratic , flatspot , idle , jtd , startup

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