1999 Saturn SL1 high idle speed

Tiny
LBOZ
  • 1999 SATURN SL1

Engine Performance problem
1999 Saturn SL1 4 cyl Front Wheel Drive Manual 76000 miles

The check engine lt. Is on, code 507. The idle speed goes up to aroun 2000rpm on start up for around 20 seconds, then drops to around 1200. If I accellerate at all, it goes back up and repeats the same thing over. The idle speed stays up between shifting as well. I know there are a number of sensort that can cause this code, any suggestions where to start?

SPONSORED LINKS
Do you
have the same problem?
Yes
No
Tuesday, October 13th, 2009 AT 10:41 AM

2 Replies

Tiny
SATURNTECH9
  • EXPERT
  • 30,872 POSTS

I would start looking for a vaccuum leak especially with that code. Start looking at the pcv hose that runs from the valve cover to the intake manifold its short and s shaped they get holes them and leak vaccuum very common. If thats not leaking then spray some carb spray around intake manifold gasket between the head and manifold and any vaccuum hoses while the engine is idling if there is a leak u will loose engine rpms might even die out. Start there then we will explore ur sensors. Let me know what u find.
Louie

SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, October 13th, 2009 AT 7:20 PM
Tiny
GWWW
  • MEMBER

Clean the Idle Air Control Valve. It's on the throttle body below the throttle position sensor. The IAC is like a giant needle valve that has a 4-pin connector on the back side of the throttle body, nearer to the firewall. It's hard to see, often overlooked, but easy to remove, clean with a toothbrush and any spray type choke cleaner. It's held on by two torx-type screws. I can't remember what size--dropped and lost the bit.
I fought this problem for two months and spent over $300 on tools and parts only to fix the problem with $.25 worth of spray.

Was this
answer
helpful?
Yes
No
Thursday, October 15th, 2009 AT 6:33 PM

Please login or register to post a reply.

Related Engine Idle High Questions

Rough Start High Idle Very Confused

I Have To Crank The Car 6 Or 7times For It To Fire Up Between All Those Cranks Engine Shakes Bad. After I Get The Car Started I Have To Keep...
Asked by admock10 ·
13 ANSWERS
1999
SATURN SL1

1999 Saturn Sl1 Ses Light And High Idle

Engine Mechanical Problem 1999 Saturn Sl1 4 Cyl Front Wheel Drive Manual Thanks, Louie I Sprayed Cleaner Around Front Of Intake With...
Asked by TNMan6978zh ·
1 ANSWER
1999
SATURN SL1

1999 Saturn Sl1 Engine Idles High

Engine Performance Problem 1999 Saturn Sl1 4 Cyl Front Wheel Drive Manual 190000 Miles When I Start My Car The Engine Revs Up To 3000...
Asked by zillathehutt ·
1 ANSWER
1999
SATURN SL1

High Idle?

Soo Would The Coolant Temp Sensor If Bad Throw The Throttle Postion Sensor Code If It Bad Or Is That That Sensor Cause Ive Been Reading Alot...
Asked by 98 staurn ·
20 ANSWERS
1998
SATURN SL1

Recommended articles