So the saab 9-3 Turbo 2.0T manual has a jerking on acceleration.
Idle is fine.
Increasing the RPMs/throttle at idle is fine.
1st gear takeoff it's fine.
It's only when the car is cruising at a speed and then you want give it more gas abruptly (step down on the accelerator pedal) it will jerk randomly.
If you just ease the accelerate pedal and let it accelerate it's fine.
It's like a misfire on one or more of the cylinders but a misfire only while driving not on idle.
I changed one of the coil packs a month ago, it seemed to solve the problem.
Now it came back.
There is no CEL.
The spark plugs are relatively new. Installed them last year.
Things I did:
- tried different coil packs
- checked cracks in hoses and vacuum leaks
- checked air filter
- cleaned up sensors like MAF
- cleaned up the throttle body (gunk)
- checked various solenoids for functionality (turbo boost etc...)
Possible issues:
- still one or more of the coil packs is bad. these are all OEM but used ones
- spark plugs need to be replaced
- exhaust leak somewhere?? (not likely)
Any ideas? Thanks
Idle is fine.
Increasing the RPMs/throttle at idle is fine.
1st gear takeoff it's fine.
It's only when the car is cruising at a speed and then you want give it more gas abruptly (step down on the accelerator pedal) it will jerk randomly.
If you just ease the accelerate pedal and let it accelerate it's fine.
It's like a misfire on one or more of the cylinders but a misfire only while driving not on idle.
I changed one of the coil packs a month ago, it seemed to solve the problem.
Now it came back.
There is no CEL.
The spark plugs are relatively new. Installed them last year.
Things I did:
- tried different coil packs
- checked cracks in hoses and vacuum leaks
- checked air filter
- cleaned up sensors like MAF
- cleaned up the throttle body (gunk)
- checked various solenoids for functionality (turbo boost etc...)
Possible issues:
- still one or more of the coil packs is bad. these are all OEM but used ones
- spark plugs need to be replaced
- exhaust leak somewhere?? (not likely)
Any ideas? Thanks