Bump on idle

[basscrazy]

a while now ive been having a bump on idle like its trying to missfire...I had a coil pack error up so presumed it was that

Replaced coil packs all of them codes gone and its still there?

When driving its absolutley mint never skips a beat but soon as you just idle it has this cough?

Any ideas?


cheers

 

[basscrazy]

to give you an idea how well it drives were talking 34.9mpg when driving normally its just as soon as you hit traffic lights etc there it is

 

[c_dog]

Maybe the throttle boddy needs cleaning\aligning? Sorted out my dodgy idle. There are some threads knocking about on how to do it.

 

[basscrazy]

if your under the car you can hear it allmost miss its strong enough to hear

 

[basscrazy]

throttle body has been cleaned re alined etc about 8 months ago? new maf as well

 

[c_dog]

Would be worth getting VAGCOM to log for misfires. Although as I understood it a coilpack either works or it doesn't and there isn't really an inbetween. Maybe worth looking down that route, or see if VAGCOM throws anything else up!

 

[1animal1]

boost leak somewhere more than likely, check for split pipes under the inlet manifold especially

 

[basscrazy]

ray vag com`d my car and said on sheet it was running mint ...

 

[1animal1]

id still not rule it out..... the 1.8T is a weird engine when it comes to lumpy idle

 

[basscrazy]

could it be my bottom end going or such

 

[1animal1]

honestly wouldnt have thought so..... the 1.8T just idle crap..... sometimes worse than others due to various things

 

[basscrazy]

what else would cause a missfire?

and why would that explain hearing it allmost a clunk when it coughs

 

[Mattfaced]

I HAVE THIS PROBLEM, HELP!! please tell me did you ever find the cure????? old post i know but im desperate

 

[s4mark]

I too am getting this cough when sitting at lights etc (well not right now as car is at work stripped awaiting repair) want to have a good look and clean under the bonnet see what i find. Want to replace all hoses with some forge ones maybe and will give the throttle body and maf a clean at the same time and just hope this cures it

 

[1animal1]

i had it for ages, had it checked by JBS for a different fault and they found the pipe that was causing it........ pure luck

when you think you've searched this engine there will always be another pipe you've missed

 

[ricko]

i'd try abit of the old redex first might be abit of crap in your injectors. have you had a look at your spark plugs to see if there all the same colour and check the gap's.