Ive cleaned throttle bodies

Done boost/vac leak test with no leaks

checked tps and cas

changed the maf

timing is ok

new temp sensor and wiring loom.

 

Could it be the ptu? When it is cold it holds back at 2500 revs and all of a sudden it will be ok and i will have a burst of speed, then i will go under 2500 revs and it will hold back again, the revs also drop when i go to pull away, after about 10 mins or so the car will run fine.

 

What do you guys think?

Have you taken the air regulator and fast idle control/auxiliary air control valve assemblies apart and cleaned them? If it's just hesitating on start-up/warm-up that should narrow down the problem possibilities!

Im no mechanic but would like to know how to do this.

Ive cleaned throttle bodies

Done boost/vac leak test with no leaks

checked tps and cas

changed the maf

timing is ok

new temp sensor and wiring loom.

 

Could it be the ptu? When it is cold it holds back at 2500 revs and all of a sudden it will be ok and i will have a burst of speed, then i will go under 2500 revs and it will hold back again, the revs also drop when i go to pull away, after about 10 mins or so the car will run fine.

 

What do you guys think?

 

i thought ptu's went wrong when hot...aka dry joints...still swapping one over is easier than pulling the idle valve unit etc

Im no mechanic but would like to know how to do this.

 

Look in the FAQ storage area of this site, under 'engine' and 'curing erratic idle' and you'll find a great pdf document on how to do this :)

 

You'll need a small socket set and a small flexible set of fingers! Just kidding - they are quite fiddly to get off, but do-able with a 1/4" drive and short and long 10mm sockets. A 10mm ratchet spanner helps if you have one. I'd also order the ficd/aav unit gasket just in case yours breaks - Should only be a few quid.