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Badly running engine 
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Joined: Tue May 17, 2016 9:48 pm
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Location: Selkirkshire
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Post Badly running engine
Anybody any suggestions.... Engine in son's K3 not running well. Starts ok most of the time, but revs fluctuate a lot at idle. Todays wee problem is that he is struggling to keep the car going steady. Description is it feels like it accelerates and then brakes itself.... eventhough still trying to drive up a hill!!! :(
Thoughts are maybe fuel pump? Lamda sensor?........ suggestions appreciated


Tue Feb 13, 2018 11:45 am
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Joined: Thu Jun 27, 2013 11:32 pm
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Post Re: Badly running engine
Hi this may or may not help
What engine does he have in the k3
Is the inlet manifold a plastic one and a plastic
Throttle body
on my k3 when i did the engine change
It hade a plastic throttle body and my car would not idle Well
i found it had gone out of shape warped i think air was geting in
See my post
paul-s-k3-t2686-180.html

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Last edited by catsam on Wed Feb 14, 2018 2:17 pm, edited 3 times in total.

Tue Feb 13, 2018 9:47 pm
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Post Re: Badly running engine
I'd have said unlikely to be lambda - my lambda failed and it just made it run very rich but other than a black exhaust and a very rich smell it ran fine. Could be fuel starvation, or possibly just some iffy petrol - could some water have got into the petrol? Blocked fuel filter? or could be ignition. If its a dizzy engine (mems 1.9) or early VVC (mems 2.0) I'd be looking at the ignition leads.

Hopefully something simple


Tue Feb 13, 2018 10:28 pm
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Post Re: Badly running engine
The throttle body is a good call if plastic, they are often a problem.


Wed Feb 14, 2018 11:09 am
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Post Re: Badly running engine
Fluctuating revs in the dark ages of no computers almost always points at an air leak in the inlet manifold. So the throttle body is a good call. If that dosnt show a fault then the next cause is the fuel delivery. Again in the dark ages it was usually dirt in the carb, so now it could be an injector fault. once that checks out ok all that is left is the spark, again in the past a cracked spark plug could give these symptoms.


Wed Feb 14, 2018 12:52 pm
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Joined: Tue May 17, 2016 9:48 pm
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Location: Selkirkshire
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Post Re: Badly running engine
Cheers..... plenty to go on there and hopefully its not too great a job!!!!


Wed Feb 14, 2018 2:50 pm
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Post Re: Badly running engine
My immediate thought was an inlet air leak too. You might try spraying liberal amounts of WD40 around the throttle body and inlet manifold while it is running. I'm not sure exactly why this works as a very short term fix - whether it temporarily seals any holes or richens the mixture I don't know.

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Fri Feb 16, 2018 3:20 pm
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Post Re: Badly running engine
Check fuel pump


Fri Feb 16, 2018 8:43 pm
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