Question about 2001 GMC Yukon

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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 terrible my engine doesn't idle rough it stutters when cruisin at speed and constantly flashes check engine only code is misfire cylinder 8

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Hi, I recommend you pull up the fuel rail with the injectors connected and crank the engine to check the spray on the #8 injector as compared to the others. The injector may be partially clogged. If there was bad gas in your truck, you may want to just pump it out and get fresh gas. Please let me know if you have questions, and thanks for using FixYa.

Posted on Jan 01, 2011

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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.

Posted on Jan 01, 2011

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1 Answer

I Have 1999 Oldsmobile alero Misfire on cylinder 1 can the spark plugs and wire the coil pack on1 and a new fuel filter and it still misfiring should i change the ignition coil module


That won't help. If firing good other cylinders, then the module is good. It could be an injector problem. You need to check the spark on #1. Make sure it is sparking good, then look for air/fuel mixture problem-bad injector or something else in that cylinder affecting the air/fuel mixture so it doesn't fire good. Maybe a valve not sealing- need a compression test to check that.

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For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

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http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
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This will help.

Thanks.

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Most likely I a would suspect the fuel rail had moisture in it. If you checked emissions it would most likely show no HC and alot of 02 and no CO. If it does show alot of HC then I would suspect sticking valves intermittantly . The pinging really points to no fuel issue tho. If you pull the injector connector off and no change then I would remove the fuel rail and inspect. Also make sure the wires are in the correct locations. It easy to get them wrong.

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1 Answer

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