Question about 1992 GMC Sierra

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My truck runs fine at times but then it will bog

My truck (1992 GMC Sierra) runs fine at times but then it will bog down like its loosing pressure or something. once it dies it turns over for a minute and then shoots out black smoke. This can take several tries before it will stay started and run ok.

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Hello there:
the way you are describing it it is sounding like the fuel filter is started to clog and might need to be replaced.
you may also want to look into a tune up i.e spark plugs and wires and rotor cap and air filter ect ect ok?
best regards michael

Posted on Sep 10, 2009

Testimonial: "I have replaced the fuel filter a couple weeks ago so I will try the tune up! Thanks"

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Posted on Jan 02, 2017

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Sep 06, 2012 | 1998 GMC Sierra

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I have a 95 sierra with 5.7 runs good cruising but when i push the accellerator down it wants to bog down. I have replaced the map sensor, tps,plugs, wires,rotor, cap, rebuilt the throttle pressure...


Have you replaced the fuel filter recently?

I would start there.
It is easy, inexpensive and often gets forgotten about.

If changing the filter doesn't help, you will know fuel flow is not the problem.

Testing your fuel pressure would be your next thing to check. But definately change the filter before that, as it may solve your bogging issue.

I have had your symptoms a few times in the past and cured them this way.

If this helps please let me know!

Good Luck!

Hal

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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.

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next time it happens try spraying water in mist form around the throttle body if it bogs, replace the throttle body gasket. if it doesn't bog you may have a bad wire wait until dark start the vehicle have someone feed the fuel very slowly and watch for arching from a wire it will be easy to see when it is dark, replace that wire.

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