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1999 Saturn SC2 jerking motion and service engine light

Tiny
BROWER74
  • MEMBER
  • 1999 SATURN SC2
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 147,000 MILES
It doesnt matter if Im taking off after a stop sign or going 65mph down the interstate but on occassion my car will start to jerk back and forth and I notice the rpms going a little crazy. The service engine soon light has now come on. What could this be and what steps should I take?
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Thursday, February 18th, 2010 AT 1:37 PM

3 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Is the jerking worse with the a/c on?It could just be spark plug wires breaking down also. If u don't live in California u can go to a auto parts store like autozone and get ur codes read for free. Get the codes read and bring the numbers of them back to me. Let me know what u find.
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Thursday, February 18th, 2010 AT 3:05 PM
Tiny
BROWER74
  • MEMBER
  • 2 POSTS
Troubleshooting p0105
definition
MAP (man. Absolute pressure)/BARO or MAF(mass air flow)/ VAN (vane air flow) sensor condition
Explanation
all vehicles one or more of these components.
Engine load or the AIR volume entering the engine is measured by these components. The computer has recognized a return signal error.
Probable cause
1.) Vacuum hose off, cracked, or passage blocked-Engine mechanical timing condition
2.) Throttle body intake tube loose, off or cracked
3.) BARO/ MAP defective
4.) VAF sensor dirty or defective

it does seem to be worse when the ac is on but it still does it when off just not as bad. The spark plug wires seem loose to me. Should I change spark plugs.
I don't understand what all that stuff means that how the ticket read from autozone. Please let me know what I should do
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Thursday, February 18th, 2010 AT 5:12 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
That info is good I have some other info for u too I just cant get it to post on here. Send me ur email adress via our private messages and ill email it to u. Also u can off ur map sensor and that little tube that goes down into the manifold sometimes gets carbon in it and clogs the vaccuum port into it. The map sensors rarely fail so its most likely something else. Let me know what u find.
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Thursday, February 18th, 2010 AT 7:52 PM

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