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1996 GMC YUKON 4X4 5.7. Running to rich. Would it be a fuel injector problem?

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Try maf sensor

Posted on Oct 08, 2009

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YOU MAY WANT TO CHANGE THE FUEL FILTER OR CHECK THE FUEL PERSSURE ON IT IF THE PSI IS LOWE IT WILL RUN THAT WAY ................

Posted on Dec 09, 2009

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terseo
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SOURCE: 1994 Yukon running rich and flooding

Fuel pump circuit (low voltage)
Try replacing the fuel pump relay or testing it if you have the manual.

Posted on Sep 20, 2009

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My fuel pressure goes to 60 pounds when the keys is turned on then starts dropping Is it my fuel pump or pressure regulator? 2004 GMC Yukon XL


Fuel pressure may drop due to a leaking injector or bad check valve in the fuel pump itself. The regulator does not come into effect until the engine is running and a vacuum supply is produced to it. If the regulator is leaking internally, it could send fuel back to the tank as well. Prime the fuel line and pinch off the return line ( if possible ) to eliminate a regulator problem. If the fuel pressure drops with the return line pinched off, suspect a leaking injector or fuel pump. If injector is leaking, the vehicle should run rich and cause a hard start/rough run condition

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Why could my 1996 yukon running rich


First. Get your truck to a parts store that will run the OBD check. That will tell you alot. Next, check the air filter...if not, check the air horn on the throttle body for carbon buildup. Remove the air duct, spray a clean cotton rag with solvent and wipe thr carbon out of the air horn.

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bad air/fuel mixture could cause rod knock like that, which is a for of backlash or whip like action. Detonation, like very poor grade of fuel. IF your engineis running really rich, the extra rich fuel goes by your piston rings and thins out your engine oil. If you have a bad ROD bearing, it is probably TOO LATE. CLEAN YOUR THROTTLE BODY and IAC valve, since these things fine tune your FUEL/AIR mixture and PREVENT rich running. GOOD LUCK!!

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What size engine ? 4.3 L vortex P0300 random misfire code is usually associated with vacuum leaks , but could also be low fuel pressure , plugged fuel filter , fuel pump problem , clogged injectors etc... doing fuel pressure an flow testing would confirm or eliminate that as a problem . Fuel injector balance testing would confirm or eliminate clogged injectors .

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I have a 1996 GMC Yuckon and it wont start, i have to spay starter fliud in it already put in a fuel pressure regulater and fuel pump is making noise.


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MANY THINGS CAUSE RICH FUEL MIXTURE.FUEL INJECTORS.MASS AIR FLOW SENSOR AND BAD OXYGEN SENSOR.

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1994 Yukon running rich and flooding


Fuel pump circuit (low voltage)
Try replacing the fuel pump relay or testing it if you have the manual.

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Could also be fuel filter, pressure, vacuum leak, etc. Check these two articles out, they should help too - http://www.obd-codes.com/p0171 and http://www.obd-codes.com/p0174

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1 Answer

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There could be all kinds of reasons your vehicle runs rich. It should be fuel injected not carborated. It could have a bad injector, bad air filter, o2 sensors etc. Have it scaned for the reason.

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