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89 Pontiac Grandam Fuel Problem?
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SillyBilly
Novice
Mar 2, 2008, 9:04 PM
Post #1 of 7
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89 Pontiac Grandam Fuel Problem?
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I have a 89 Pontiac Grandam 2 door with A/C, automatic Transmision. I had a problem with the vehicle not starting and trouble shooted down to the computer, so I replaced it and it ran fine for a few days. Now as long as I prime the throttle body with fuel directly it will not start. After I get it started, it will idol just fine for as long as there is fuel in the tank, but if I floor the gas pedal, it will fall on its face and die if you keep it at full throttle. I replaced the fuel regulator on the throttle body, the fuel filter, and the throttle body gasket, but still the same. I bought a fuel pressure tester but my lines are threaded and I can not get it to hook up, but at the fuel filter there is a lot of pressure when I crack it open, so just asuming fuel pump is ok. I here the pump kick on when I turn on the key so atleast that part of the pump is correct. Any tips?
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dave284
Enthusiast
Mar 3, 2008, 9:29 AM
Post #2 of 7
(1649 views)
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Re: 89 Pontiac Grandam Fuel Problem?
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What about the injector/s and fuel filter,have you replaced any of these?
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SillyBilly
Novice
Mar 3, 2008, 1:55 PM
Post #3 of 7
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Re: 89 Pontiac Grandam Fuel Problem?
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I have not replaced the injecter because looking at it, it is throwing an even spray of fuel, and there is only one fuel filter located at the rear underneath side of vehicle. At least thats what the book states, only one filter.
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SillyBilly
Novice
Mar 16, 2008, 4:59 AM
Post #4 of 7
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Re: 89 Pontiac Grandam Fuel Problem?
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Still no succes on this matter,,, help please?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 16, 2008, 6:54 AM
Post #5 of 7
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Re: 89 Pontiac Grandam Fuel Problem?
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Get that fuel pressure tester to hook up and report pressures off (key on) and when running would help,
T
(This post was edited by Tom Greenleaf on Mar 16, 2008, 6:55 AM)
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DanD
Veteran
/ Moderator
Mar 16, 2008, 7:40 AM
Post #6 of 7
(1615 views)
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Re: 89 Pontiac Grandam Fuel Problem?
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Sorry guys I didn't see this thread and posted in the general forum as well.
I’m assuming this is a four cylinder because of you saying throttle body gasket and no fuel test port?
Regardless I think you should make sure of the fuel pressure; it’s hard to tell the difference between 5psi or 15psi which is approximately what a four cylinder needs to run properly.
There is a replacement fuel filter available that has a test port incorporated in the end. I get mine from a company called FMSI part #4261; nice easy way to test pressure without having to modify the fuel lines.
Here’s a link to there web site not sure if they’re in your area but there has to be another company out there that will have something simular?
http://www.fmsiinc.com/Default.htm
Dan.
Canadian "EH"
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SillyBilly
Novice
Mar 16, 2008, 10:39 AM
Post #7 of 7
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Re: 89 Pontiac Grandam Fuel Problem?
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Dan, Thanks for the filter tip, and I will check the pressure, because I guess five psi would make it run like that if it where a weak fuel pump. I will let ya know results asap.
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