Question about 1992 GMC Jimmy

1 Answer

I just changed the mapsensor, both fuel injectors and truck will start but wont stay running, I have a 4.3L 2wd and TBI System, dont know what to do at this point so far engine seems good, just did major tuneup, it was driving and then one day it just shut off , figured out it was the fuel injectors but now when those got changed and the throttle body got cleaned it wouldnt start , then replaced map sensor , it started but wont stay idle, dont know what to do at this point

Posted by sunflowerisi on

  • Jeffrey Turcotte
    Jeffrey Turcotte Jun 06, 2017

    Hi sunflowerisi, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Have you checked fuel pressure? If you don't have a gage, try cracking the nut at the throttle body with the key on to see if you get a squirt.

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1 Answer

EdCarCal

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  • GMC Master
  • 1,169 Answers

Idle is controlled by Idle Air Control (IAC) and the Throttle Position Sensor (TPS). Check these, and then the EGR valve.

Posted on Jun 06, 2017

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5 Related Answers

Anonymous

  • 36 Answers

SOURCE: 1987 Chevy Suburban 350 2wd not starting or running right

What size engine do you have in it? And, how many miles on it?? Well, I guess it really doesn't matter. At first thought it sounds like you are experienceing a fuel problem, and changing the throttlebody didn't solve your problem. I would start by looking and checking my fuel delivery system. The fact that you had to spray gas into the throttlebody tells me that fuel is not getting there. I would start with the least expensive thing to fix first. Check your gas filters. These are often , OFTEN, overlooked as a sorce of problems, and are rarely changed and often overlooked, and are the problem alot of the time. If that dosen't cure your problem check your fuel pump. Make sure it is delivering the proper pressure. I would bet your problem would be solved, but if it's not then next I would check the electrical components of your fuel system.

Posted on May 12, 2009

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jagjeffery

Jeffery Lewis

  • 329 Answers

SOURCE: throttle body injectors not fiering but there is fuel pressure

the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up

Posted on May 31, 2009

Anonymous

  • 1 Answer

SOURCE: 1991 s15 4.3 TBI jimmy will not idle

I had this problem also and it turned out to be egr solenoid

Posted on Feb 20, 2010

Molson02536

Harvey N Tawatao

  • 3854 Answers

SOURCE: 95 GMC Sierra 4x4 350 5.7 rough idle problem

It sounds like a MAP sensor going bad. MAP is short for manifold absolute pressure sensor, it senses the manifold pressure and applies the right amount of gas with the right amount of ignition timing so the car runs and performs well if this does not work properly. It throws off the whole loop cycle for the computer, which in turn makes it run badly and get poor fuel economy. It can causes the engine to have a lack of power, combined with a loss of fuel economy. Poor take offs and sometimes an occasional stalling may occur if the MAP sensor is faulty and sending the wrong signals to the ECM.
Hope this helps and thank you for using Fixya.
Here is a link that my help you in the future. http://www.troublecodes.net/GM/

Posted on Mar 16, 2010

Zaraki

  • 834 Answers

SOURCE: Truck will turn over but not start. Checked fuel

The ignition module located inside of the distributor is what generates the signal that the ECM (Engine Control Module) uses to time and fire the fuel injectors, as well as the signal to run the fuel pump and the dwell signal timing to fire the ignition coil. A faulty ignition module can cause any one of these systems to malfunction.

That does sound like a malfunction with the ignition module inside of the distributor, and you can remove the ignition module and have it tested for free at most auto part stores.

If you do purchase a new ignition module be sure that it does come with a silicone grease or a die-electric compound because it is a heat sink and the ignition module will burn up without it.

To install the new ignition module first clean out the mounting surface inside of the distributor. Then completely coat the metal contact surface under the ignition module with a thick coat the silicone grease or die-electric compound and do not leave any of the metal contact surface of the ignition module un-coated with the silicone grease or die-electric compound, and be very careful not to over-tighten the ignition module or it will be damaged.

Posted on Jun 22, 2010

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