Question about 1999 GMC Suburban

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Gm diesel 6 5

Have 1995 Gm, 6.5 diesel engine. Starts to chug at highway speeds as if it is not getting enough fuel. Changed fuel filters twice. Anyone out there have any idea what the problem is. Starts ok, warms up ok, drives at low speeds ok but take it out on the highway above 50 MPH and it starts to chug as if not enough fuel. Tks Richard.

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Have to service these a lot it's the MAP sensor ( manifold absolute pressure sensor ) this should fixya.

gm diesel 6 5 - b8f6a7d4-6342-4203-9911-2ab2bef97c0f.jpg

Posted on Nov 25, 2013

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Posted on Jan 02, 2017

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SOURCE: 454 ci gm turns over hard backfires timing ok acts flooded

Check fuel pressure, and regulator. A leaking regulator gives a warm engine more fuel [ it does not like it] a cold motor does. same as a flooded motor. Good luck

Posted on Mar 24, 2009

emmetmyers
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SOURCE: 96 GMC pickup w 350 engine, starts hard after like 8 hours.

could be your fuel pump relay you should check to see if the pump runes for about 3 sec. when you turn the key to the on position. It should if not the oil switch is turning on the pump after you achieve pressure.
if not check the relay. also with the pressure gauge hooked up check if your pressure drops off fast after you turn off the car. if so you need ether a pressure reg or a fuel pump.
hope this helps

Posted on Jun 20, 2009

  • 432 Answers

SOURCE: My 93 K2500 GMC 4X4 Suburban wont Go Once It warms up

Check the catalitic converter,fuel filter, sparkplugs and sparkplug wires.

Posted on Oct 28, 2009

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SOURCE: GM truck vortec Eng oil pressure low with high engine noise

CHECK THE OIL PUMP SUMP TUBE O-RING. THEY COLLAPSE CAUSING THE OIL PUMP TO PULL AIR INSTEAD OF OIL. TO VERIFY OVER FILL ENGINE OIL AND CHECK ENGINE OIL PRESSURE. THIS IS A COMMON PROBLEM ON ALL NEWER GM V-8 ENGINES : 4.8 5.3 5.7 6.0

Posted on Dec 24, 2009

  • 691 Answers

SOURCE: I have a 1999 GMC YUKON. About a year ago I broke

Check the Oxygen sensors, as they control gas to air ratio. By spider do you mean the Coil Pack? Cam Sensor and Crank sensor? What about a vacuum leak?

You are going to cuss me for this but, according to your description, this did not occur BEFORE you changed the pump, and you have changed it twice. Are you sure you hooked up the external tank and EVAP lines correctly? Are any of the rubber hose's under there rotten? The EVAP system use's vacuum to pull fumes from the gas tank. The EVAP canister is probably behind one of the rear wheels, and up behind the rear fender. Check those hose's too. Check the intake manifold vacuum lines and connectors for leaks and cracks. Better yet, inspect all your vacuum lines.

Posted on Aug 27, 2011

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