1979 Cadillac Seville mind of his own.

Tiny
THIJN
  • MEMBER
  • 1979 CADILLAC SEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 63,000 MILES
My car has a "mind of his own".
It starts good and then the engine dies after 1-2 seconds.
If I "play around"with the gas pedal it "sort of "keeps running but when I let go of the gaspedal it stops again.
But on other moments it starts and runs smootly, no problems and this happend twice when my mechanic was around to check it.
if I turn the key, right before it starts I hear the "switch" of the"main" fuel pump(on the gas tank) "kick in' so I gues that works.
Could it be the "second"fuel pump, under neath the body, that works only now and then?
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Wednesday, March 17th, 2010 AT 6:37 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Verify the fuel pressure if its within specs if okay -check and test the /IACV/Idle Speed/Throttle Actuator - Electronic, throttle position sensor and also clean out the EGR valve and check and test the airflow meter/sensor.
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Monday, March 29th, 2010 AT 1:16 PM
Tiny
RETIREDMECHANIC
  • MEMBER
  • 8 POSTS
There is no air flow meter on a 79 Seville. On the intake manifold, just to the side of the thermostat housing, there is a temp sensor (2 wire), this acts as a choke to give your engine more fuel when the engine temp is low. An intermittent signal will give you the troubles as you are having. It's been a long time but I believe if you measure it with an ohm meter (cold) it should read around 800-900 ohms. Replace the temp sensor if it is bad.
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Saturday, June 5th, 2010 AT 8:18 PM

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