Question about 1998 GMC Sierra

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No power somtimes

1998 gmc 1500 5.7
replaced fuel pump fuel filter fuel regulater temp and fuel censor cap and rotor

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  • mspayde925 Feb 07, 2009

    testshowing bank 1 lean and bank 2

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Check mass air flow sensor

Posted on Feb 06, 2009

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What would cause my engine to bog out it ideals fine but as soon as I press the throttle it' bogs I replaced the injectors fuel pump fuel filter what should I try next ?


Replace the distributor cap and rotor. These year GMC's eat them up. If you find the cap with brass contacts they will last longer. Unfortunately still only about a year. Another possibilty is the coil.

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1996 gmc 1500 vortech 5.7 stars then suts off


The spider is made of plastic. Heat kills with time. Replace the spider.

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I have a 1994 gmc 1500 truck with a 5.7 v8.one fuel injector is pumping fuel and the other injector is not!!!!i swapped the injectors and its not the injector.


Go to the parts store and get a noid light for your truck, plug it into the injector electrical and turn the engine over to see if there is electrical pulse, also check the fuel pressure, the pump needs 9-13 psi with the engine running. you know if there is no pulse your going to need to check the wireing first. let me know

Feb 10, 2011 | 1994 GMC Sierra

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1998 GMC Sierra 2500 5.7L hard cold starts last month, now won't start cold w/o a little carb cleaner in intake. Codes for oxy sensors, mass air sensor and crank/cam position. Drove today, no power just...


starting definately has a lot to do with the crank/cam position sensors, but it wouldnt have nothing to do with hot or cold weather, oxygen sensor will make the vehicle run too rich if its out, you will smell fuel very strong out the exhaust, that could make it run sluggish also, and usually if the mass air flow sensor goes out the vehicle wont start at all...

Nov 27, 2010 | 1998 GMC Sierra

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1997 chevy silverado 1500 350 vortech, new fule pump not working


before you drop tank again, check fuses & relay.then disconnect fuel line @ filter turn key to on position should hear fuel pump run and get gas stream out of line. if no flow from line new pump faulty be sure & remove negative battery cable first good luck.

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2 Answers

1998 gmc 4.3 starts up but loses power 3-5 mins later,will restart and run again for another short time,fuel filter has just been replaced.


Install a pressure gauge, start and run 3-5 minutes and watch the pressure. You should see the pressure maintain as it did when first started. If it begins to drop, the fuel pump has gotten weak and is starting to fail.
Let me know what you find.
Regards.

Mar 05, 2009 | 1998 GMC Sierra

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