fallwood

Just started to notice this as ive got used to the car. Under full throttle I can feel a kind of stuttering as the car accelerates, it feels like it is backing off slightly at times. Doesnt do it all the time , seems to do it more if ive been driving steadily for a while and then decide to boot it. Ive also noticed that a couple of times when ive been out in the car then stopped somewhere for 5 mins and then set off again it doesnt seem to boost properly the first few times I floor it. The ecu was reset last week and ive only done about 150 miles since, could it be the ecu is still learning my driving style.

The_Judge

What MY are we talking about?

What gears does it do it in?

What revs?

DaveD

iTrader: (2)

Sounds like it could be heat soaking the intercooler.
I get this occasionally if i've been sat in traffic - first attempt to floor it results in a bit of hesitation due to the higher inlet temps. Once all the heat has been purged from the inlet system everything is back to normal.

That's what you get for having the intercooler sat on top of a hot engine!

mus...

Possibly boost solenoid problem. My 00MY has had the problem either hot or cold.
Try a search for 'pulsing'

mus

The_Judge

Could be several things really, to name but a few...

Failing MAF.

Sticking wastegate solenoid.

Failing lambda sensor (if it does it on part throttle).

The dreaded "D" word... although doubtful, depends on MY, mods, fuel used, etc...

fallwood

Its a y reg 2001 model, its just had a new lambder fitted before I bought it. It tends to feel a bit jerky under partial throttle, pulls a bit and then a jerk and then carries on pulling. Ive just fitted a diy cel fix to the car, could this be causing any problems. When it was dyno'd last week no problems were found and the power curve was lovely and smooth, just seems to have got a bit lumpy over the past week.

Turbotits

iTrader: (2)

What was the cel-fix for? If it was for a de-cat then its likley the car is over boosting and the hesitation is the ecu correcting the boost level. I had this with mine, I got a sudden burst of power then slight hessitation and then it was off again.

fallwood

It has been de-catted (just downpipe) and chipped, its running at 18psi, have give it some stick over the past few days and it seems to have got better.