rough running

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Jan 7, 2008 | 09:06 PM

john03

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please help!!!!

i have a 03 f150 4.2L 4x4 when i have the heat or fan on the truck runs like i have a bad injector or plug. I just had a tune up 2 months ago. when i turn off the fan switch the truck will run almost normal.. does anyone have any answers. please help!!!

Last edited by john03; Jan 7, 2008 at 09:58 PM.

Jan 7, 2008 | 10:59 PM

morrowtruth

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From: Rock Branch, WV

did it start doing this right after the tune up?

Jan 8, 2008 | 10:34 AM

john03

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no it was about a month after

Jan 8, 2008 | 08:03 PM

streethealer

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From: Medina TN

Have you alt. checked. Your fan could be drawing enough current to rob other sensors, and they could be failing due to a lack of current. Just a thought...

Jan 9, 2008 | 08:28 AM

john03

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thanks i will check. One other thing is the service engine light is always on solid until i get on the highway once i get up over 100km the light will start to blink, when i get off the highway it will go solid again.. The truck is all stock at the time.....

Jan 9, 2008 | 11:19 PM

streethealer

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From: Medina TN

You need to have the codes read and post the code numbers here. Someone will tell you what they mean and where to start looking to fix your problem. A blinking CEL is usually a misfire or a pending code, I think. The solid CEL if for a code that has already been set. Autozone will scan them for free if you have one close by you. You gave your speed in k/hr so I am "assuming" that you are north of the border, so IDK if they have autozones in your "neck of the woods".