Clio 182 LY
Wondering if anyone can help...
I have a Clio 172 phase2, however I am struggling to get to the bottom of a recent problem.
When the car is cold, it struggles to idle and the revs bounce up and down and if you use the throttle then back off the revs drop down and 9 times out of 10 it will cut out. Once the car is up to temperature it runs without fault, but cold starts are becoming a headache.
However, the blanked off vacuum pipe that runs down to the acoustic valve behind the headlight has a screw in the end, when I remove this screw then the engine idles correctly and smooth. No dipping revs when backing off the throttle and performance seems fine however I have now introduced a vacuum leak - so it shouldn't run better! Any thoughts?
It's as if an old car with a choke doesn't have it engaged, however it has the later style throttle body that has no separate idle control valve, could the throttle body cause cold start idle issues? I've removed it and cleaned it - but made no difference. What's in the black plastic cover?
I have been working my way through the car replacing components with genuine Renault parts, have replaced the following:
MAP sensor, Inlet air temp sensor, Coolant temp sensor, TDC sensor, coil pack, ht leads, spark plugs and inlet gaskets. Also carried out a coolant change and replaced the pre-cat lambda with a Bosch sensor (tested and working). Car has a de-cat fitted. No fault codes stored, no warning lights on dash.
The problem was getting worse, and I thought a coolant temp sensor change improved the problem but it only lasted a few days before going back to how it was before. Temp gauge inside is working as it should, and reaching temp. Have checked wiring and it all seems fine, and have also checked the main earth down to the gearbox / fuses and relays.
Thanks guys
I have a Clio 172 phase2, however I am struggling to get to the bottom of a recent problem.
When the car is cold, it struggles to idle and the revs bounce up and down and if you use the throttle then back off the revs drop down and 9 times out of 10 it will cut out. Once the car is up to temperature it runs without fault, but cold starts are becoming a headache.
However, the blanked off vacuum pipe that runs down to the acoustic valve behind the headlight has a screw in the end, when I remove this screw then the engine idles correctly and smooth. No dipping revs when backing off the throttle and performance seems fine however I have now introduced a vacuum leak - so it shouldn't run better! Any thoughts?
It's as if an old car with a choke doesn't have it engaged, however it has the later style throttle body that has no separate idle control valve, could the throttle body cause cold start idle issues? I've removed it and cleaned it - but made no difference. What's in the black plastic cover?
I have been working my way through the car replacing components with genuine Renault parts, have replaced the following:
MAP sensor, Inlet air temp sensor, Coolant temp sensor, TDC sensor, coil pack, ht leads, spark plugs and inlet gaskets. Also carried out a coolant change and replaced the pre-cat lambda with a Bosch sensor (tested and working). Car has a de-cat fitted. No fault codes stored, no warning lights on dash.
The problem was getting worse, and I thought a coolant temp sensor change improved the problem but it only lasted a few days before going back to how it was before. Temp gauge inside is working as it should, and reaching temp. Have checked wiring and it all seems fine, and have also checked the main earth down to the gearbox / fuses and relays.
Thanks guys
