1 Attachment(s)
Saturn Sky Redline 2.0 Turbo engine surging
I am super new to the hp tuners platform. I had a professional tune my car, but I keep getting this random engine surging. In the attached 30 second log, I have the cruise set, on flat interstate. Out of the blue, the rpms will start bouncing around. The tuner has supplied about 8 different tunes so far, and this still randomly happens.
2008 Saturn Sky Redline 2.0 Turbo
Catless downpipe
ZZP exhaust
Fujita CAI
Unknown aftermarket charge pipes
Things I've done chasing this bouncing:
Changed MAF
Changed o2 sensor
Changed EVAP purge and vent solenoids with the canister
New coils / AC Delco plugs
Swapped injectors with known good ones
Swapped throttle body with down good ones
Compression tested
Pressure tested from turbo inlet and sprayed soap everywhere looking for leaks....none I could see.
Swapped cam solenoids with known good ones
Capped evap purge solenoid
I keep banging my head against the wall on this. Spending too much time and money chasing this annoyance down. Can any of you gurus look at the 30 second log and see if you see anything? I have plenty of other logs too, just throwing one up that shows it running fine, then randomly doing the surging thing.
Attachment 145638
I should probably add this is a new to me car. I bought it with a turbo that leaking oil. Replaced the turbo.....not sure if it ran correctly before I bought it. The tuner said the original tune pulled off the car was pretty jacked.
