What causes my car to, when it reaches 25 mph and 40 mph, respectively, to jerk and also the RPM is high?

Tiny
ESTELLE MASSIAH
  • MEMBER
  • 2001 SATURN SL2
  • 105,000 MILES
My car labor before it reaches 25mph, is at very high rpm and then it jerks, rpm goes dowm a bit jerk again when it reaches 40 mph and rpm is high again.
Friday, March 30th, 2012 AT 5:37 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the fuel pressure if its within specs -start here
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Friday, March 30th, 2012 AT 6:11 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Just to add to this one does it only jerk when shifting or while acellerating?Any codes in the computer?
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Saturday, March 31st, 2012 AT 1:20 AM
Tiny
ESTELLE MASSIAH
  • MEMBER
  • 2 POSTS
Thanks for your prompt response. Only when shifting and accellerating.
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Tuesday, April 3rd, 2012 AT 4:58 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So does it feel like the transmission is slipping?Or the engine is cutting out?If the engine is cutting out I would check the spark plug wires first also the spark plugs. Make sure there isnt platnuim plugs in the engine. They carbon foul in those engines you want stock copper plugs I recomend the ngks like it came with. Also any codes in the computer?Have you checked for codes?Also is the jerking worse with the a/c on if the a/c works?
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Tuesday, April 3rd, 2012 AT 5:18 PM

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