eddyvr4
Leaving Skid Marks
Hi all, looking for some advice from some of the more mechanically experienced members here
the symptom is an intermittent stutter that sometimes occurs as a single jolt on light load, just off boost. and also very occassionally series of jolts under full load. its not a savage stutter like a boost cut but very noticible even by passengers.. like its dropping a couple of cylinders. it can run for 50 or 100km no problems, then do it a couple times, then fine again for a while.. its most consistent on light loads after idling or coasting for a while, but occasional under full load like overtaking. on the whole the car runs fine, but its an irritating issue i cant seem to iron out.
VK22 plugs are between 0.7mm to 0.9mm gaps and all look the same and ok (10,00km old or so) , all 3 coilpacks are almost brand new and the plug leads are ICE units and less than 20,000kms old. (and measure about the same DC resistance each)
compression is good and even on all cylinders. (injector seals have been done)
ive nipped up earthing points on the engine and wiggled plugs on the coilpacks at idle.. (it has an earthing kit fitted from japan) no oil leaks into the spark plug holes.
sometimes it does idle a tad rough in traffc (just a bit more vibration than normal) no hunting or stalling etc.
could it be a fuel delivery issue and how best to test that?
It does feel like a problem on the high tension side but ive replaced everything..
no error codes are logged.
any other ideas? any help would be much appreciated..
the symptom is an intermittent stutter that sometimes occurs as a single jolt on light load, just off boost. and also very occassionally series of jolts under full load. its not a savage stutter like a boost cut but very noticible even by passengers.. like its dropping a couple of cylinders. it can run for 50 or 100km no problems, then do it a couple times, then fine again for a while.. its most consistent on light loads after idling or coasting for a while, but occasional under full load like overtaking. on the whole the car runs fine, but its an irritating issue i cant seem to iron out.
VK22 plugs are between 0.7mm to 0.9mm gaps and all look the same and ok (10,00km old or so) , all 3 coilpacks are almost brand new and the plug leads are ICE units and less than 20,000kms old. (and measure about the same DC resistance each)
compression is good and even on all cylinders. (injector seals have been done)
ive nipped up earthing points on the engine and wiggled plugs on the coilpacks at idle.. (it has an earthing kit fitted from japan) no oil leaks into the spark plug holes.
sometimes it does idle a tad rough in traffc (just a bit more vibration than normal) no hunting or stalling etc.
could it be a fuel delivery issue and how best to test that?
It does feel like a problem on the high tension side but ive replaced everything..
no error codes are logged.
any other ideas? any help would be much appreciated..