Question about GMC Yukon

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My 2003 gmc yukon stalls at red light and check engine light is flashing.it seems to running on 4 cylinders.when i pull the injector connector off of the intake it still runs

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Had similar problem with my 2001 pontiac grand prix. replace engine coolant temperature sensor. Vehicle may start , but run very poorly, blowing black smoke, running very rough and misfiring. Cost $15 autozone.

Posted on Feb 03, 2009

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In school we had one like that it was the throtle position sensor

Posted on Dec 12, 2008

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How do I reset the ECM?


2003 GMC Yukon XL check engine light run - YouTube

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Mar 31, 2014 - Uploaded by Antonio Salinas
2003 GMC Yukon XL with a check engine light on. ... HOW TORESET CHECK ENGINE LIGHT, FREE EASY ...

Oct 02, 2015 | 2003 GMC Yukon XL

1 Answer

96 GMC 1500 5.7 this problem has been reoccurring. Missfire on the 4 cylinder. It comes and goes. The check engine light would come on then off when I dropped the trailer or when pulling a hill. Loss of...


it indicates injector problems
leaking injector seal /s dirty injectors
you can try moving no 4 injector to another cylinder and if the misfire moves as well , replace that injector
it it doesn't move the misfire , it is coils or ECM problems

Jun 07, 2017 | 1993 GMC Sierra K1500

3 Answers

2003 SATURN VUE SERIVE ENGINE SOON LIGHT IS BLINKING ON AND OFF RAN THE OBDII READER AND CODE P0304 CYLINDER MISFIRE CAME UP I CHANGE SPARK PLUGS AND BOOTS BUT CAR STILL DRIVES ROUGH SHAKES AND WHEN PARKED...


The P0304 indicates the #4 cylinder is misfiring. The flashing light means the cylinder is not firing at all...It could be several things causeing it, coil, wires, plug, injector or vacuum leak. Do not drive your vehicle until you have this repaired, as it will lead to further more costly problems. Good luck, i hope this helps.

Jul 27, 2011 | 2003 Saturn VUE

1 Answer

I have a 2003 yukon Problem with the GMC Yukon XL


What size engine ? 4.3 L vortex P0300 random misfire code is usually associated with vacuum leaks , but could also be low fuel pressure , plugged fuel filter , fuel pump problem , clogged injectors etc... doing fuel pressure an flow testing would confirm or eliminate that as a problem . Fuel injector balance testing would confirm or eliminate clogged injectors .

Mar 24, 2017 | 2003 GMC Yukon XL

2 Answers

I have an 01 gmc with a cylinder 8 misfire I checked plug looked good only a month old I changed fuel filter and coil pack used one tho seem to have good continuity on plug wire fuel in the filter looked...


If your engine is the "vortex" engine, the it is most likely an injector. I have had to clean the injectors on numerous occassions to clear a misfire code. You have a "spider" injection system. There is a central unit and 8 injector tubes that run off that unit. the tips like to clog with junk.

Jan 01, 2011 | 2001 GMC Yukon

1 Answer

Check engine light goes on and off and when i got it diagnosed it said misfire cylinder 4 i changed plugs and o2 sensor and light has not gone


You may want to take a look at the coil and/or wire for leaks. If these are ok check injector and cylinder compression.

Oct 23, 2009 | 1998 GMC Yukon

1 Answer

I have a miss in my 2002 gmc yukon


Have the vehicle checked for code's . will show what cylinders are missing . Do drive it like that , check engine light flashing , will damage the catalytic converters

Jan 15, 2018 | 2002 GMC Yukon Denali

1 Answer

2001 GMC Yukon Flashing Check Engine Light


dear sir the flashing check engine light means the truck was misfiring at the time of the incident .If the light is still on you can go to auto zone they will pull the codes for you and reset the light if you like.but if running good now then probably nothing to worry about .

Mar 26, 2009 | 2003 GMC Yukon Denali

5 Answers

2003 GMC throttle position sensor


I had the same problem with my 2003 denali and came to find out that it was the battery causing the problem. the battery with sufficient power will dictate the tps. if the battery is low or bad, it won't have enough juice to allow the tps to. work. get your battery checked.

Dec 09, 2008 | 2003 GMC Yukon

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