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Thanks for the reply Dan. Will have a look and see how we get on.

Its obviously an earth problem, plain to see. Im assuming water may have gotten to some of the wiring causing the short, but im not entirely sure where to start.

Hello, I have a clio 1.2 16v expression. The car starts up and ticks over fine but no response from the throttle. Diagnostic scan has come back with the following 531- pedal potentiometer circuit track 1, circuit to earth. 197 - throttle angle sensor circuit short to earth 589 pressure sensor...

Sorted!!! Bent pin on the MAP sensor... thank you all for your help.

Unfortunately not. Paid a recovery company to collect and drop the car.

Yup - Saturday morning. Nothing to report, everything as it should be. It seems to me like an air intake problem. When the car is up to temperature and you disconnect the brake servo vacuum pipe, it draws more air into the intake manifold. Put the hose back on and the misfire and idle sorts...

Thanks Steve. Runs no better with the air box removed. I can appreciate what you are saying but Mick is a good hour away from me and the car is currently sorn, i wouldnt hesitate otherwise!

Thanks to the reply. Yes i did compression test and all 4 cylinders read 180 give or take 5, so i am satisfied with that

Take a look at this...

Thanks for the replies. Surely if the car has a vacuum leak, in this case on the brake servo line. It will cause the car to run rich thus potentially fouling plugs the and will in turn cause a misfire ? 1 thing is for the, this pipe is affecting the running of this car in some way . I will try...

Interesting! Thanks :)

Sorry, i should have said. Thats sorted now... cheers. But i think we are getting close to the source of the problem here is a better picture, on the back of the inlet manifold next to tge tb.

Im thinking this pipe may have something to do with my issue. If you let tghe car get up to temperaryre, ( roughly half way on the gauge ) and pull off this pipe and put it back on, the car runs sweet. No misfire, no bad idle - nothing. Not the bed picture admitedly, but it sits on the back of...

Can anybody identify what this is and what it does ? Because this one doesnt appear to do a great deal.

Jolly good for you. Certainly have not ignored you either. I went back to basics long before I posted the thread asking for advice, and I am working my way back through them as and when I can. Thanks for your input so far and all the best.

You must have understood, I wasn't implying that as I can't speak for him. I was implying that if it is good enough for him then it is good enough for me... he uses them on a daily basis I don't. I didn't say I don't believe you, I have no doubt about your knowledge or ability and i thank you...

Thank you James, appreaciate that.

I apologise, I'm not sure I said or meant that he thinks they are as good as the Renault ones. He worked in a Renault workshop and has since opened up a garage of his own, he allowed me to borrow the tools to time the Clio back up which turned out to be the tools from AST. What I meant was if...

Thanks for the replies. Shall run a compression test this evening.

Watch "172 misfire 2" on YouTube

I dont recall doing that no, guesing we should have done ?

Thats a good point... thinking about it we changed all of the cam seals and have actually had both of the pulleys off to do so. To tighten the bolts back up we locked the cams off to stop the pulleys from moving, Not with the same tool used to time the car back up may i add...

We didnt use the pulley locking tool. I was under the impression that was only neccersary when changing the dephaser pulley. Tools were AST and borrowed from an ex renault technician, they are good enough for him so i opted to use these. Interesting point about the timing mark being visible in...

Thanks for the reply. Fuel, the car is running rich and throwing out clouds of black smoke out of the exhaust. Spark, we have 8 plugs in total, albeit used. Should probably try a new set although i am reluctant at £60+ VAT for a set! Im sure out of the 8 we have, 4 of them will be good enough...

Thanks for the reply... we followed the guide on the forum to do the timing and used the correct tools for the job. I just dont see how it can be the timing personally... over 3k ish revs there is no misfire. I would imagine if the timing was out the misfire would be apparent whatever revs ?

Changed lambda sensor this evening and the problem persists. The car is running rich and the lambda change doesnt appear to have made any difference. I cant see it being the timing myself, the car revs up to well. Seems to misfire when the car is kept at a constant rev range. Car is idling alot...

Cambelt had slipped and bent a few valves. New head put on along with new timing beltkit and cam seals. Watch "Clio 172 misfire" on YouTube Here is a video - poorly sick Car!

Thanks for the replies - Appreciated. Pretty sure the timing is correct, used the correct tools from a garage who allowed use of his tools. Also, Im sure that if the timing was out, the misfire would be present at any rev range, not just below 3k ish ? Ive not been able to drive the car yet...

We have just changed the cambelt on a clio 172 and after starting the car for the first time the car appears to be misfiring. I am unsure how it sounded before as i bought it as a non runner. The car is running very lumpy on tickover but from around 3k revs the misfires seems to dissapear. We...

No problem :) I did wonder when you said it so it came as no surprise