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Truck running funny :/

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Old 01-13-2012, 10:48 AM   #1
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Truck running funny :/

hey everyone im new to the forum and im in need of some help. about a couple weeks ago i noticed when i take my truck out to do errands or what not, i turn off the truck, do whatever i have to do come back turn my truck on and it starts idling rough and when i put it in gear its really jumpy and hesitating when i get on the gas. It only does it when i turn the truck on after it had time to warm up. it's perfectly fine when its cold. i threw a CEL yesterday and put my code reader on it and it gave me a p0300 and 301 which is a random misfire on cylinder 1. anyone know what it could be since it only does it when its warm?
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Old 01-13-2012, 10:54 AM   #2
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Any black smoke right after starting?
Does the idle smooth out after a minute or so?

If so, it could be a leaking injector for cylinder #1.
While its sitting the the parking lot, the residual pressure
causes fuel to drip into the cylinder, and run real rich
for a minute.
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Old 01-13-2012, 11:00 AM   #3
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no black smoke. when its warm it will stay running rough. i thought maybe a egr valve i dont think my truck has one.
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Old 01-13-2012, 11:10 AM   #5
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Quote:
Originally Posted by 4WD View Post
Pretty sure no EGR... Clean your MAF sensor...
that^^^
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Old 01-13-2012, 11:13 AM   #6
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Basics on trouble shooting a 300 series CEL code:

Inspect the plug for cracks/bad electrodes (check gap: should be .039-.043")/loose connector
Replace (all) if anything cracks are found or if the electrodes are worn


Swap coils with another cylinder/Reset code/see if code number changes
If it changes to the cylinder the coil was swapped to, it's the coil.
If it doesn't change, it's the plug or injector.

Repeat above process with injector if none of the above worked
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Old 01-13-2012, 02:19 PM   #7
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Seems to be temperature-related.
Could be one of the temp sensors telling the computer that
its still cold, even after it warms up.
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