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  #1  
Old 04-16-2014, 11:04 AM
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Angry P0300, P0301, P0306 codes

I own a 2002 Jeep Grand Cherokee Laredo 4.0. The past two years I have been dealing with these same codes, I have done a complete tune up, fuel system clean out, and fuel pump. I took my Jeep to a mechanic to get the fuel system cleaned out and he stated that if that did not work then I would have to replace my fuel pump because the regulator could have gone out. Recently I did that and I am still getting the codes P0300, P0301, P0306. When it starts acting up is when I go over 50 mph for a mile or so, then I have to stop or slow down. Once I come to a stop I put her in park or neutral, and shut her down then restart and the issue goes away until I have to slow down or stop again. I know these codes are Misfire codes. Can someone please help me figure this issue out.
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Old 04-16-2014, 12:00 PM
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Re: P0300, P0301, P0306 codes

Bad coil pack?
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Old 04-16-2014, 12:16 PM
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Re: P0300, P0301, P0306 codes

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Originally Posted by Chaoul1 View Post
Bad coil pack?

I have tried this and changed twice
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Old 04-16-2014, 04:29 PM
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Re: P0300, P0301, P0306 codes

Changing the fuel pump because of the regulator? The fuel pressure regulator sits inside the external fuel filter, not in the pump.
Does the engine seem to misfire, or does it only show the codes? It is known that a bad TPS can generate an electrical noise signal which the PCM mistakingly can interpret as a misfire .
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Old 04-16-2014, 06:47 PM
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Re: P0300, P0301, P0306 codes

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Originally Posted by Frango100 View Post
Changing the fuel pump because of the regulator? The fuel pressure regulator sits inside the external fuel filter, not in the pump.
Does the engine seem to misfire, or does it only show the codes? It is known that a bad TPS can generate an electrical noise signal which the PCM mistakingly can interpret as a misfire .
No it is a misfire and I get the codes, I feel the misfire. Ty though
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Old 04-16-2014, 06:52 PM
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Re: P0300, P0301, P0306 codes

What about plugs and wires?
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Old 04-16-2014, 06:52 PM
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Re: P0300, P0301, P0306 codes

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What about plugs and wires?
A complete tune up was done twice
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Old 04-16-2014, 07:02 PM
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Quote:
Originally Posted by vlilley74 View Post

A complete tune up was done twice
Okay. What about a compression test. Even a small compression leak in the cylinders could cause a misfire. Possibly a head gasket is starting to go.
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Old 04-16-2014, 07:17 PM
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Re: P0300, P0301, P0306 codes

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Originally Posted by Strongjeff View Post
Okay. What about a compression test. Even a small compression leak in the cylinders could cause a misfire. Possibly a head gasket is starting to go.
Had that done when I got the fuel system cleaned out........ all good
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Old 04-16-2014, 07:22 PM
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Originally Posted by vlilley74 View Post

Had that done when I got the fuel system cleaned out........ all good
Hmmmm.... not too many things left to check.
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Old 04-16-2014, 07:24 PM
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Re: P0300, P0301, P0306 codes

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Hmmmm.... not too many things left to check.
I know that is why I posted in this forum
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Old 04-16-2014, 07:24 PM
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