Sparkplug and wire replacements

MARKJ2016

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17 POSTS

Cylinder # 1 has coil over plug

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Monday, April 18th, 2016 AT 6:11 PM

MARKJ2016

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17 POSTS

#1 Cylinder has Coil over plug, leads to #4 cylinder

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Friday, April 22nd, 2016 AT 9:01 PM

MARKJ2016

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17 POSTS

Ok, never did get around to getting a spark tester for the coil over plug on #1 Coil with P0301 misfire. I am still confused as to why the truck runs fine from cold start up to operating temperature and then once shut off for 5 min and starting back up, rough idle and P0301 code produced.

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Sunday, May 1st, 2016 AT 3:32 PM

MARKJ2016

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With truck idling smooth and at operating temperature, I removed the electric connector to #1 fuel injector and the engine immediately started idling rough, put it back on and smoothed out. When engine is running rough, pulling the electrical connection to #1 injector has NO bearing on engine. I think something is up with #1 fuel injector.

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Sunday, May 1st, 2016 AT 4:07 PM

SATURNTECH9

MECHANIC
30,869 POSTS

Of course it won't number 1 isn't firing you do the same test by unplugging the coil. Swap the number one coil with another cylinder and see if the missfire follows.

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Sunday, May 1st, 2016 AT 6:15 PM

MARKJ2016

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Thanks for your help Saturntech9. I pretty much narrowed it down to fuel injector #1 and thus took it to Firestone. They confirmed it was #1 fuel injector by replacing it and the fuel filter. Truck is running 100% again.

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Sunday, May 15th, 2016 AT 11:20 AM

SATURNTECH9