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1994 Saturn SL1 Saturn bucking and jerking after engine war

Tiny
BMERT
  • MEMBER
  • 1994 SATURN SL1
  • 4 CYL
  • FWD
  • MANUAL
  • 250,000 MILES
HELP PLEASE!

My saturn has over 250,000miles on it, and within the past year, it has started to act up.
While driving, when the engine heats up to a certain temperature the car will start to buck and jump. I got one of my friends to look at it and he gave it a tune up and changed the coil pack and map sensor, and that seemed to fix it for a few months. My car just started doing it again, and I don't know what I should do.
I also changed the air filter, but I don't know if that helped any.
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Monday, November 8th, 2010 AT 8:14 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it
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Monday, November 8th, 2010 AT 12:29 PM

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