lumpy at certain range

Mar 16, 2013
516
0
Shrewsbury
Hi Guys, i got pd150 cupra, 140k, belts/pumps done, nothing done to the engine at all really.

however, if i sit in 5th, at 2k revs, hold it steady and then ease off a touch on the gas, it starts to run lumpy, almost like its about to stall, the engine doesnt make any different noise, the revs dont drop, (apart from what you would expect from the gas being let off)

It wouldnt stall if i left it, thats just the best way i can describe it, its like a juddering.

only does this momentarily, maybe 1-2 seconds, then its fine. Could also only happen when its cold, only noticed it a few times so far.

Only happens at about 2k revs, in 5th gear. same revs in other gears are fine.

Cheers
Josh
 

paul_n

Active Member
Nov 23, 2014
8
0
I stand to be corrected here but you may possibly have a sticky vnt mechanism on your turbo or an issue with boost pressure control solenoid. First things first scan with vcds. Also do some live data readings paying particular attention to requested and actual boost pressure readings.
 

JAMBON13

Active Member
Jul 23, 2016
12
0
I have the same issue, no fault codes come up tho :(


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