Hesitation/judder between 2200-2700 rpm

-bobda- · Aug 14th, 2006, 18:40

Right, as has been discussed here, I'm experiencing a judder between 2200 and 2700rpm (roughly). It occurs on light throttle and is most noticeable at motorway speeds (70-80 mph).

It feels like the car slows down, then speeds up again slightly and sometimes it judders in waves, which always occurs at about 2500rpm. It still does it when the cruise control is engaged, but not as badly. This is probably due to the ECU counteracting the loss in power by adding more fuel and 'smoothing out' the problem.

It's done nearly 70k miles and has recently had a new turbo fitted (old one went blew a seal and dumped oil out of the exhaust) and the garage who changed the turbo nd fitted a new exhaust, said that they had fitted a new EGR valve, but I'm not 100% sure if this was done. It has also had a custom remap, but this was fine before the turbo went pop.

I've tried cleaning off the MAF, which didn't seem to cure it, but the hesitation feels like a MAF fault, as if it is telling the ECU that there is more air getting in than actually is and less fuel is consequently injected.

Any other suggestions?

Aug 14th, 2006, 18:40	#1
-bobda- Member Last Online: Nov 5th, 2007 14:15 Join Date: Jan 2006 Location: Leeds	Hesitation/judder between 2200-2700 rpm Right, as has been discussed here, I'm experiencing a judder between 2200 and 2700rpm (roughly). It occurs on light throttle and is most noticeable at motorway speeds (70-80 mph). It feels like the car slows down, then speeds up again slightly and sometimes it judders in waves, which always occurs at about 2500rpm. It still does it when the cruise control is engaged, but not as badly. This is probably due to the ECU counteracting the loss in power by adding more fuel and 'smoothing out' the problem. It's done nearly 70k miles and has recently had a new turbo fitted (old one went blew a seal and dumped oil out of the exhaust) and the garage who changed the turbo nd fitted a new exhaust, said that they had fitted a new EGR valve, but I'm not 100% sure if this was done. It has also had a custom remap, but this was fine before the turbo went pop. I've tried cleaning off the MAF, which didn't seem to cure it, but the hesitation feels like a MAF fault, as if it is telling the ECU that there is more air getting in than actually is and less fuel is consequently injected. Any other suggestions? __________________ Andy. --- 2003 S40 T4 Sport Lux. Last edited by -bobda-; Aug 14th, 2006 at 18:42.

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