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1990 Cadillac: Engine runs rough..accelerate..you jump..dead stop

1990 Cadillac Sedan Deville -...
1990 Cadillac Sedan Deville - Engine runs rough at start up, wants to die out. After warm up, will run and accelerate fine, strong engine. Will want to die out if you jump into passing gear or from a dead stop. Also will give a small backfire on occasion while driving - no reason. What do I look for?
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Answered in 6 minutes by:
4/22/2012
Randall C
Randall C, ASE Master Tech
Category: Cadillac
Satisfied Customers: 13,143
Experience: ASE Master Tech, 32 years exp,Cadillac 6 yrs
Verified

Tracer :

Hello, My name I Randall. I will do my best to assist you with your question.

Tracer :

Can you tell me if the slight backfire you hear comes form the exhaust/tailpipe or from under hood at engine?

Customer:

under the hood

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thanks checking some things. back shortly
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Ok, a backfire through engine is from a lean condition. all your symptoms tend to point to fuel delivery problem.This engine had a problem with the fuel pressure regulator. They changed the design slighty. Fuel pressure is controlled by the regulator mounted on fuel rail. I suspect it is fialing but cant be 100% with overnight fuel pressure reading and fuel pressure reading when problem happens. I lean to a bad regualtor at this point
Randall C
Randall C, ASE Master Tech
Category: Cadillac
Satisfied Customers: 13,143
Experience: ASE Master Tech, 32 years exp,Cadillac 6 yrs
Verified
Randall C and 87 other Cadillac Specialists are ready to help you
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Randall C
Randall C
Randall C, ASE Master Tech
Category: Cadillac
Satisfied Customers: 13,143
13,143 Satisfied Customers
Experience: ASE Master Tech, 32 years exp,Cadillac 6 yrs

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