1995 Cadillac Concours

JSHOFF

MEMBER
1995 CADILLAC DEVILLE CONCOURS
V8
FWD
AUTOMATIC
225,465 MILES

First of all my car has never done this before. I was driving and all of a suddon my engine started bogging down and I would give it gas and it felt like it was struggleing for power. And if I would let it sit for a while then try to start it it would start right up and in a matter of minutes it would sputer and have a little bit of a back fire and then die. Trying to restart the car it just sputers little back fire and dies. I have fuel pressure and also changed the fuel filter. Also my car needed gas that day so I filled it with 14 gallons of 91 like always and an hour latter this problem started occuring

3 Replies

FACTORYJACK

MECHANIC
4,159 POSTS

If you have adequate fuel pressure(35-45 psi), and this all happened after getting fuel, I would first take a fuel sample from the line. As far as a quality check, smell it. Good fresh gas will have alot of vapors and a strong fuel smell. Check and see that the EGR is not stuck open, if this is a northstar you won't be able to visually tell. I would tap on the base with a prybar, extension, or ratchet handle, something solid. If it is a 4.9, fell up under the brass colored dome, you should be able to feel the diapragm, and also be able to push it up. Low spark output may cause a symptom like this, as well as restricting exhaust. One way to check if the exhaust is restricted, remove the o2 sensor and see if it will start and run. If it seems fine with the exhaust leak before the converter, than the converter may be restricted.

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Wednesday, June 23rd, 2010 AT 9:59 PM

JSHOFF

MEMBER
2 POSTS

I have tryed all that except the psi on the fuel pressure I just pust it in to see if there was gas flowin threw it. I also relized that my fuel pump will start up at first then just stop.

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Thursday, June 24th, 2010 AT 1:39 PM

FACTORYJACK