irratic idle and missfire

[Dan-t]

Ive done a search before anyone asks but have found nothing to help me

I have a clio 172 cup and heres the problem

When i bought the car it had quite a lumpy idle, it was due a cambelt change so i took it to a reputable company who have all the correct locking tools etc, they informed me that someone had had a go at replacing the belt unsuccesfully before hand and it was a tooth out which would have explained the lumpy running and por running when cold.

Since having it replaced properly its still lumpy but it now has a very lumpy idle as if its searching and occasionally when i stop at a junction the revs die right down before jumping back up to idle, i also have a slight miss fire on part throttle below 3000rpm.

Ive changed the plugs today and tried a coil pack that i knew was working but these did nothing to help.

Does anyone have any ideas that might help me?? would be very gratefull

 

[Dan-t]

any ideas??

 

[Dan-t]

cleaned tdc sensor, changed plugs leads and coil pack but still no joy

 

[richy22]

Throttle body? and or your Fly By Wire pedal

 

[jon_d_h]

Could be an air leak maybe your throttle body gasket or another gasket.

 

[Dan-t]

ive just ordered a new throttle body today ill get there in the end

 

[Schweppy]

Let us know if that fixes it!

 

[Dan-t]

whats peoples thought son the cat? do they normally break on 172's the cars on 55000 miles

 

[Dan-t]

fitted new throtttle body today and it seems so far my problem has all but gone, still a little lumpy on idle but as far as im aware this is common on 172's ive yet to drive it from stone cold so fingers crossed itll still be good

 

[richy22]

random bump...where did you get your TB gasket from??? Renault??

 

[moosey]

Any update on this issue, Dan?

 

[SEAN172]

sounds like a pre cat lambda sensor

 

[Slammed172]

Im getting this issue, would like an update..

 

[monkeybutlerfez]

ive got the same problem, is there an update?