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Engine problems on a 1989 gmc r3500 with a 454 tbi.
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wes104
Novice
Mar 30, 2014, 1:34 PM
Post #1 of 12
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Engine problems on a 1989 gmc r3500 with a 454 tbi.
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my old truck is randomly sputtering.its like it don't get any gas but when it does it you can put it in neutral and it will run fine but put it back in drive and it will do it agian.they are completely random.it wont do it every time but most of the time.ive changed the plugs and the wires and fuel filter.
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 30, 2014, 5:12 PM
Post #2 of 12
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Re: Engine problems on a 1989 gmc r3500 with a 454 tbi.
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Check engine light on?
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 30, 2014, 5:24 PM
Post #4 of 12
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Re: Engine problems on a 1989 gmc r3500 with a 454 tbi.
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There are two types of lean conditions on an engine; vacuum leaks (including stuck open EGR) and not enough fuel getting into the engine. Both of those things can be caused by numerous other things.
The key is trying to figure out what the engine is doing when it is running lean. The best method to determine how the air fuel mixture is is by monitoring the O2 sensor voltage.
I doubt you have an scan tool that can read engine data on that, so you might have to manually check the O2 sensor voltage using a volt meter.
It is also possible the O2 sensor can stick lean which makes the engine computer add more fuel to the engine when it doesn't need it. It might make it stumble and run rich and set that lean code. It is important to make sure the O2 sensor is functioning properly before using it to diagnose a fueling problem.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 30, 2014, 5:40 PM
Post #6 of 12
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Re: Engine problems on a 1989 gmc r3500 with a 454 tbi.
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Make sure you inspect and clean out the fuel tank before you dip another pump into it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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wes104
Novice
Mar 30, 2014, 5:49 PM
Post #8 of 12
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Re: Engine problems on a 1989 gmc r3500 with a 454 tbi.
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coould the rubber fuel line between the pump and sender have a crack
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Discretesignals
Ultimate Carjunky
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Mar 31, 2014, 4:25 AM
Post #9 of 12
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Re: Engine problems on a 1989 gmc r3500 with a 454 tbi.
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That is one possibility. A fuel pressure gauge test would confirm something like that.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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wes104
Novice
Mar 31, 2014, 3:31 PM
Post #10 of 12
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Re: Engine problems on a 1989 gmc r3500 with a 454 tbi.
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got me a fuel pump.i was just going to pul the tank to check the little line but just in case its the pump dont want to have to pull the tank twice.
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Discretesignals
Ultimate Carjunky
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Mar 31, 2014, 6:32 PM
Post #11 of 12
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Re: Engine problems on a 1989 gmc r3500 with a 454 tbi.
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Just make sure the tank is clean before you install your new pump. There is a filter on the pump, but it doesn't filter everything. It would probably be a good idea to have the tank cleaned by a radiator shop if it is in good shape.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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wes104
Novice
Apr 7, 2014, 3:28 PM
Post #12 of 12
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Re: Engine problems on a 1989 gmc r3500 with a 454 tbi.
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drove it for a little while know an seems to be fixed ty guys for the help.it was prbly just the line because it was like it melted and cracking but i went ahead and changed the pump so i dont have to take the tank off agian.
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