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1998 Seville Stalls

Tiny
GREENSCAPES
  • MEMBER
  • 1998 CADILLAC STS
  • V8
  • FWD
  • AUTOMATIC
  • 90,000 MILES
1998 Seville STS stalls when it is at idle in either nuetral or drive. Also after long runs it has a run away idle up to 3000 RPMS. Car has 90kmiles
Friday, April 1st, 2011 AT 12:26 AM

4 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Any check engine light, or have the codes been read?
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Friday, April 1st, 2011 AT 12:31 AM
Tiny
GREENSCAPES
  • MEMBER
  • 2 POSTS
No CEL but DTC codes read P1652(history)chasis pitch, and a near stall detected.
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Friday, April 1st, 2011 AT 12:04 PM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
The near stall code would be expected. A few common problems are an air leak after the mass airflow sensor, and possible crank sensor faults. The latter, I would not suspect, would give you a racing idle. There is a resonator on top of the air inlet snorkel, sometimes the clamp is missing and a backfire or vibration can knock it loose, it is after the MAF. Also there is the intake plenum boot that can split in an area that is not visible. You will usually have lean codes to go with this, and there could be lean codes in failure records and not read as faults just yet. You could also have a faulty IAC(idle air control) valve, or dirty passage.
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Friday, April 1st, 2011 AT 3:32 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
The throttle position sensor is bad. It has to be set with a multi meter after installation. Gl
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Friday, April 1st, 2011 AT 4:37 PM

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