Mechanics

TRIES TO STALL OR BOG DOWN.. IDLES FINE

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.
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Peter courtless
March 1, 2012.




When was the last tune-up? Any applicable trouble codes? When it stalls, can you tell if system is running lean or rich?

JDL
Mar 1, 2012.
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)

Tiny
Peter courtless
Mar 1, 2012.
Use a gage and check fuel pressure. Do you think it might be a tranny issue?

JDL
Mar 1, 2012.
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.

Tiny
Peter courtless
Mar 1, 2012.
Without being able to look at it, I don't know?
AD

JDL
Mar 1, 2012.
What about ECM?
Or Fuel pressure regulator?

Tiny
Peter courtless
Mar 1, 2012.
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.

JDL
Mar 1, 2012.
When I get off work I will try that. Thank you.

Tiny
Peter courtless
Mar 1, 2012.
No codes come up in computer. Goes rich when bogging down.

Tiny
Peter courtless
Mar 2, 2012.
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.

JDL
Mar 2, 2012.

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