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2002 Saturn SL1 Rough Idle

Tiny
DCLAPPER81
  • MEMBER
  • 2002 SATURN SL1
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 57,000 MILES
I just bought a used 2002 Saturn SL1 with 57,000 miles and I just noticed that the car idles very rough, at an RPM of about 600-650, like it's going to stall out, when sitting at stop signs or stoplights with the car in Drive. Oddly enough, the idle is smooth when I turn the air conditioner on. I thought this may be due to the fact that turning the AC on increases the car's RPMs by about 50-100. Also, the car does not have a rough idle in Neutral, Park, or Reverse. Once I start driving, I don't notice any other problems. Any idea of what might be causing this? Another mechanic said it might be the top motor mount, but I'm not so sure because the problem only happens when the car is idling. It does not vibrate or shake while driving.
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Wednesday, April 29th, 2009 AT 3:57 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the idle air contol valve, throttle position sensor, EGR and PCV valves and vacuum leaks
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Thursday, April 30th, 2009 AT 3:46 AM
Tiny
DCLAPPER81
  • MEMBER
  • 2 POSTS
The check engine light came on yesterday. I had it checked this morning and it said there was a misfire on cylinder #1
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Thursday, April 30th, 2009 AT 1:29 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0301 misfire at cyl no. 1

You should check the sparkplug/compression/injector for that cyl.
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+1
Thursday, April 30th, 2009 AT 3:58 PM
Tiny
HUSKERVILLE
  • MEMBER
  • 1 POST
I have a 2002 saturn SC1 that does the same thing. did you get it fixed and if so what did you do.


https://www.2carpros.com/forum/automotive_pictures/353808_1ee1b99cc4d4_1.jpg

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Saturday, May 9th, 2009 AT 6:13 AM
Tiny
DATADRGN
  • MEMBER
  • 1 POST
I TOO have the exact same issue with a 2002 saturn SL1.
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Tuesday, June 9th, 2009 AT 3:24 PM

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