Question about 1996 GMC Sonoma

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96 gmc sonoma misfire after replacing multiple ignition parts

Has 4.3 motor with 163k on motor replaced plugs,wires,cap,rotor,ign. coil,coolant temp sensor still have issue

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  • kegan gettman Dec 08, 2012

    The misfire seems to go away after driving it for 30 mins or so......then the next day itll misfire and pop all over again...thought about the cpk .

  • kegan gettman Dec 08, 2012

    havent replaced the icm yet .... the truck doesnt have a cat converter but the 02 sensors are welded onto the exhaust and hooked up...cel threw a po300 two weeks ago but will misfire until operating temp but the cel will stay on. If the plugs arent gapped 100% to .6 would it cause it to misfire?

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  • Master
  • 2,101 Answers

Have you replaced the ignition control module in the distributor

Posted on Dec 08, 2012

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Posted on Jan 02, 2017

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SOURCE: i have a 01 GMC sierra 4.3 and my check engine

chek injectors posible leak

Posted on Nov 04, 2009

keemo68
  • 1263 Answers

SOURCE: 1996 GMC 1500 Pickup.

if you keep blowing a fuse there's a good chance it's not a faulty part but a short in the main harness most likely under the dash where all the connectors tend to get brittle over time and short out constantly. also check the ecm connection there is a 60 pin type.

Posted on May 19, 2009

emissionwiz
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SOURCE: Misfires 96 gmc sierra 5.0

I suggest you have the injectors tested by the dealer, the sludge buildup will not cause a miss fire. to clean the throttle body use carberator spray while holding the engine idle high.

Posted on Aug 05, 2009

  • 1118 Answers

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

ftw1952
  • 10319 Answers

SOURCE: 94 gmc sonoma 4.3l vortec new coil, plugs, wires

The ignition module in the distributor is what you need to give the engine spark to the plugs. It senses signals from the PCM to regulate the spark control and this item is the part that took over the old style point & condensor type ignitions. It is time for a new one in your truck

Posted on Apr 17, 2010

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Engine cranks but wont start has an obd p 300 &p304 help me


P0300 Random/Multiple Cylinder Misfire Detected, the 304 is for cylinder number 4 any of these could be wrong If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors. Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open

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The ignition module in the distributor is what you need to give the engine spark to the plugs. It senses signals from the PCM to regulate the spark control and this item is the part that took over the old style point & condensor type ignitions. It is time for a new one in your truck

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Try this:With the engine running, pull the connector wire off of the #4 injector. Note to see if there is any change with the idle quality. No change? You may have a bad injector.

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