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Tries to stall or bog down. Idles fine

Tiny
PETER COURTLESS
  • MEMBER
  • 1992 CADILLAC DEVILLE
  • 191,000 MILES
Car starts and idles fine but after 5 minutes or so it tries to stall or bog down. Idles fine and restarts fine. Fuel pump pressure tested and fine.
Thursday, March 1st, 2012 AT 5:29 PM

10 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
When was the last tune-up? Any applicable trouble codes? When it stalls, can you tell if system is running lean or rich?
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Thursday, March 1st, 2012 AT 5:41 PM
Tiny
PETER COURTLESS
  • MEMBER
  • 6 POSTS
Replaced Cap and rotor, and coil and plugs.
Cap was burned through under the coil.
AlsoIgnition control module.
No codes in the computer (current or History)
Car rarely stalls it just runs like walking in mud.(Bogging down)
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Thursday, March 1st, 2012 AT 8:28 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Use a gage and check fuel pressure. Do you think it might be a tranny issue?
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Thursday, March 1st, 2012 AT 8:44 PM
Tiny
PETER COURTLESS
  • MEMBER
  • 6 POSTS
Fuel pressure 45 (on not running) 41 (ideling)
Tranny seems to be same as last 3 years. Acts like an older car that timing was off a few degrees when you step on peddle.
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Thursday, March 1st, 2012 AT 9:10 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Without being able to look at it, I don't know?
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Thursday, March 1st, 2012 AT 9:21 PM
Tiny
PETER COURTLESS
  • MEMBER
  • 6 POSTS
What about ECM?
Or Fuel pressure regulator?
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Thursday, March 1st, 2012 AT 9:28 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I don't think the regulator has a problem. Can you watch the 02 sensor signal, to see if it goes rich or lean when it stalls?

Can you cause a code to set in computer? I think there should have been a code 12, even if nothing else.
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Thursday, March 1st, 2012 AT 9:49 PM
Tiny
PETER COURTLESS
  • MEMBER
  • 6 POSTS
When I get off work I will try that. Thank you.
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Thursday, March 1st, 2012 AT 10:13 PM
Tiny
PETER COURTLESS
  • MEMBER
  • 6 POSTS
No codes come up in computer. Goes rich when bogging down.
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Friday, March 2nd, 2012 AT 12:40 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
The fuel pressure looked good to me, but, does the pressure hold for a bit with engine off? Anymore the 02 sensors are part of a tune-up. I can't say that will fix it? If you cause the systen to go lean, will the 02 sensor/s react accordingly. If the 02 sensor reacts, I don't think that is the problem.
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Friday, March 2nd, 2012 AT 2:56 PM

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