Question about 1997 GMC Sierra

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My truck has a #4 cylinder misfire according to the OBDII I've tried running injector cleaner, replaced the plugs, wires, and coil. To no avail and suggestions?

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Try to check that the fuel injector, using a fuel injector tester, is getting an electrical pulse as indicated by the tester lighting up and blinking periodically.

Also, one can check the injector by putting a stethoscope on the injector and listening for a loud click.

Also, check that antifreeze is not leaking into the cylinder causing the plugs not to fire. How did the plug look that was replaced? It should have had a light brown dry appearance if normal.

Posted on Oct 07, 2010

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Fire it up at night and look for arcing in the dark. It may also be nothing more than number 1 plug wire misrouted in a way that inductively picks up energy from one of the other coil packs or cylinders. It should cross other plug wires only once.

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Check engine light on . will not pass DEQ code po 304


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clean the MAF, Mas Air Flow Sensor in the air intake tube first. Use carb cleaner or MAF cleaner. Do not touch the 2 sensor wires that you spray. delicate!!

ALso, put a bottle of Chevron Techron Fuel injector cleaner in the fuel tank, 1/4 tank or less.

Try that first. Also, replace spark plugs, put antiseize on the threads. Last resort is to replace the COPS, Coil on plug for each offending cylinder.

Misfire Definition: A misfiring cylinder is lacking power relative to the other cylinders. The causes for a cylinder specific misfire could be fuel, spark, or mechanical problems. Perform a thorough visual inspection. If no visible concerns are found use the following WDS tools for misfire diagnosis:
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  • Power Balance (Identify the cylinder of concern)
  • Relative Compression (Rule out a possible mechanical issue)
  • Fuel (Make sure fuel injectors are not restricted) (plugged)
  • Ignition (Make sure spark plugs and coils are working properly)
  • Oscilloscope (Detailed signal analysis)

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Some cars have a multiple coil system. One coil to two wires, etc. It could be the coil for that cylinder. Past that it could be the Ignition Control Module but if that is bad you would probably be getting what is called random engine misfiring and not just a problem with one cylinder. Could be an injector which the cleaner might help. Make sure you have good compression on the cylinder, that the plug hasn't fouled since being replaced, the plug wire is solidly seated, etc.

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Code 27 MIL light options: OBDII
P0201 - Injector #1 Control Circuit
P0202 - Injector #2 Control Circuit
P0203 - Injector #3 Control Circuit
P0204 - Injector #4 Control Circuit
P0205 - Injector #5 Control Circuit
P0206 - Injector #6 Control Circuit

CODE 43 - Cylinder Misfire, or Ignition Primary Circuit

CODE $# MIL options: OBDII
P0300 - Multiple Cylinder Misfire
P0301 - Cylinder #1 Misfire
P0302 - Cylinder #2 Misfire
P0303 - Cylinder #3 Misfire
P0304 - Cylinder #4 Misfire
P0305 - Cylinder #5 Misfire
P0306 - Cylinder #6 Misfire
P0351 - Ignition Coil #1 Primary Circuit
P0352 - Ignition Coil #2 Primary Circuit
P0353 - Ignition Coil #3 Primary Circuit

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