Question about 1991 GMC Sierra

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91 gmc 5.7 Tbi flooding

I have replaced anything an everything except the engine PCM including distributor plugs wires temp sensor

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 92 gmc 1500 4x4 when at operating temp starts

Your egr.valve may not be functioning good chanse its got carbon build up, or there is no vacume to it, remove it and clean it with carb cleaner, both the valve and the intake.

Posted on Dec 24, 2009

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SOURCE: 91 GMC G2500 5.7L 350 Stalling when warm

You should try looking at the transmission fluide, it must be short. If it is, you should go buy a transmission fluid. And make sure you car pipes has no leak.

Posted on Jan 11, 2010

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SOURCE: what is the best engine to replace my 91 350 TBI

454w/smaller carbs, you will go through everything. you could choose 396 old school for gas mileage, great engine.

Posted on May 18, 2010

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I have a 91 GMC suburban that has been sitting for a year I changed the oil and the fuel filter and repaired fuel line among lots of other things the truck started up then shuts off an smokes black


How long since over-all tune-up? Any applicable trouble codes? You may need fresh fuel? If your check engine lite still works, you should be able to check some codes, yourself? I don't know liter size of engine?
Is the vehicle flooding? Use a gage and check proper fuel pressure. Do you have tbi fuel injection, fuel injector/s in the throttle body. If so, the fuel pressure is 9--13 psi. Also, the coolant temp sensor could cause it to flood. Could be other issues?

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Hi mate start at the easiest point which will be to check your EARTH to make sure everything is earthed.

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1998 dodge dakota 3.9L engine flooding problem


What are the symptoms? Why do you think it's flooding?

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Jan 28, 2013 | 1998 Dodge Dakota

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1997 gmc truck pings


Timing should be set by the PCM. So you cant adjust the timing. However if you have a faulty knock sensor the PCM cant tell the proper time to fire. The knock sensor picks up on ignition ping and adjust the time to send spark to the plugs.. Other causes of ping can be the engine temp, faulty EGR or the engine can be to lean.

Oct 15, 2012 | 1997 GMC Sierra

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No spark


First does the rotor turn when cranking engine?? possible timing chain is out or stripped gear..are you sure it has no spark??did you verify this with a high output spark tester ? did you spray starting fluid in the tbi unit ?

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What is the best engine to replace my 91 350 TBI engine in my 91 gmc single cab stepside. I want more power but dont want to break the bank


454w/smaller carbs, you will go through everything. you could choose 396 old school for gas mileage, great engine.

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1994 GCM Safari with the TBI on V6 engine. The


Try putting a little fuel in the carb, if it fires up and starts it will be the float in the carb float chamber has got stuck, easy to strip and clean, be up and running well within an hour ;)

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1 Answer

Have a 97 dodge 318 plugs flood as soo as you try


check your coolant temp sensor. possible map sensor.
The MAP sensor is fitted to the front of the throttle body except on 4.7L and 8.0L engines where it is installed on the intake manifold.
  1. Remove the air cleaner assembly.
  2. On throttle-body mounted MAP sensors, inspect the L-shaped tube from the throttle body to the MAP for cracks, blockage, and damage. Repair as necessary.
  3. Unplug the MAP sensor connector.
  4. Test the MAP sensor output voltage at the MAP sensor connector between terminals "sensor ground" and "sensor signal". With ignition ON and the engine OFF , the voltage should be between 4-5 volts.
  5. Check voltage across the same terminals with the engine running at idle at operating temperature. Voltage should be 1.5-2.1 volts.
  6. Test MAP sensor supply voltage at sensor connector between terminals "sensor ground" and "5v supply" with the ignition ON and engine off, voltage should be 4.5-5.0 volts.
  7. Test the MAP sensor ground circuit at the "sensor ground" of the MAP connector, voltage should be less than 0.2 volts. If not inspect for open harness from pin 4 of PCM harness and terminal A . If no voltage is present, proceed to the next step.
  8. Turn the ignition OFF .
  9. Disconnect the PCM harness from the PCM.



WARNING Testing the wiring harness with the PCM still connected can cause serious damage to the processor. ALWAYS disconnect the PCM before testing the wiring harness, unless instructed otherwise.

  1. Test the MAP sensor output voltage at the PCM connector. At the PCM cavity A-27 , the voltage should be about 5.0 volts.
  2. Check the voltage at PCM cavity A-17 . It should be 5.0 volts.
  3. If all of the above tests pass, plug in PCM wiring harness and MAP sensor connector.
  4. With the ignition in the ON position, and the engine OFF , remove the tube from the throttle body to the MAP sensor.
  5. Connect a vacuum pump to the nipple on the MAP sensor, and pump the sensor to 20-27 in. Hg. Check the sensor output voltage, it should be below 1.8 volts. If not, replace the MAP sensor. If the voltage is OK, proceed to next step.
  6. Relieve vacuum pressure on the sensor, then check the output voltage. The voltage should be 4-5 volts; if not, replace the MAP sensor.
  7. Install the air cleaner assembly.

Jan 22, 2010 | 1997 Dodge Ram 1500 Club Cab

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