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sboom
Novice
Mar 2, 2010, 8:12 AM
Post #1 of 10
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Won't Stay Running
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I have a 1998 Pontiac Grand Prix GTP, 3.8, super charged,175k, I was driving the car when it just quit running. I can restart but it will only run for about 20 seconds and kill. If you feather the pedal I can keep it running but very rough and it will die as soon as it is put into gear.
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nickwarner
Veteran
/ Moderator
Mar 2, 2010, 8:53 PM
Post #2 of 10
(3679 views)
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Re: Won't Stay Running
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check your fuel pressure. Also, is the engine light on? If so what are the codes?
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Sidom
Veteran
/ Moderator
Mar 2, 2010, 10:39 PM
Post #3 of 10
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Re: Won't Stay Running
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Follow Nick's advise 1st and get the codes read.
Once you have the codes pulled a quick check you can try would be to disconnect the MAF sensor and see if this makes a difference in the way it runs. If it runs better or can be driven you may be looking at a bad sensor but this will set a code so you do want to have them pulled 1st before you start setting them...........
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sboom
Novice
Mar 5, 2010, 10:55 AM
Post #4 of 10
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Re: Won't Stay Running
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I did have the codes read and they all came back as evap codes high pressure,low pressure, evap malfunction. M ore than likely they came up when I was forcing the car to stay running.
the fuel pressure is in range. when the car starts and runs for a short time the fuel pump does not stay operating after the car is started. I turn the key on the pump pressures up but does not continue once I start the car.
Fuel Regulator??
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bioguy
User
Mar 6, 2010, 2:39 PM
Post #5 of 10
(3657 views)
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Re: Won't Stay Running
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Could be fuel reg and a few other things. It could have a faulty oil sender if it is a three wired unit. They need to have good oil pressure to allow the fuel pump relay to continue to run ( safty feature on some cars) Turn key on and pump pumps up to pressure then start, then the oil sender has to read around 4 pounds of pressure to keep the relay open to pump. Had this on a car once with a bad loose wire. You may not have that but it is worth a check. Also check for good gas cap, faulty relay.
Just a couple thoughts from here.
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nickwarner
Veteran
/ Moderator
Mar 7, 2010, 2:24 PM
Post #6 of 10
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Re: Won't Stay Running
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pull the vacuum line off the pressure regulator and see if there is fuel leaking past the diaphragm. If so, replace your regulator
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sboom
Novice
Mar 8, 2010, 11:01 AM
Post #8 of 10
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Re: Won't Stay Running
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Where would the prime wire be located. I'm aware of the dual speed and dual relays, I switched them to see if it had an impact on the way the car ran but there was no differcnce. The pump pressures up to about 53# and drops to about 43#.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 8, 2010, 11:08 AM
Post #9 of 10
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Re: Won't Stay Running
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There is a terminal off the fuel pump speed control relay where you can apply power right to the pump.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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sboom
Novice
Mar 8, 2010, 12:21 PM
Post #10 of 10
(3615 views)
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Re: Won't Stay Running
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The car will start and run for 10 to 20 seconds. When pressure was checked it goes up to 53# then falls to 43#. After the key is turned on the pump energizes but cuts out as soon as the car starts and it kicks back in once the car stalls.
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