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-   -   P0300, P0301, P0306 codes (http://www.jeepgarage.org/f203/p0300-p0301-p0306-codes-74086.html)

vlilley74 04-16-2014 11:04 AM

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.

Chaoul1 04-16-2014 12:00 PM

Re: P0300, P0301, P0306 codes
 
Bad coil pack?

vlilley74 04-16-2014 12:16 PM

Re: P0300, P0301, P0306 codes
 
Quote:

Originally Posted by Chaoul1 (Post 1008383)
Bad coil pack?


I have tried this and changed twice

Frango100 04-16-2014 04:29 PM

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 .

vlilley74 04-16-2014 06:47 PM

Re: P0300, P0301, P0306 codes
 
Quote:

Originally Posted by Frango100 (Post 1008478)
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

Strongjeff 04-16-2014 06:52 PM

Re: P0300, P0301, P0306 codes
 
What about plugs and wires?

vlilley74 04-16-2014 06:52 PM

Re: P0300, P0301, P0306 codes
 
Quote:

Originally Posted by Strongjeff (Post 1008537)
What about plugs and wires?

A complete tune up was done twice

Strongjeff 04-16-2014 07:02 PM

Quote:

Originally Posted by vlilley74 (Post 1008538)

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.

vlilley74 04-16-2014 07:17 PM

Re: P0300, P0301, P0306 codes
 
Quote:

Originally Posted by Strongjeff (Post 1008542)
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

Strongjeff 04-16-2014 07:22 PM

Quote:

Originally Posted by vlilley74 (Post 1008545)

Had that done when I got the fuel system cleaned out........ all good

Hmmmm.... not too many things left to check.

vlilley74 04-16-2014 07:24 PM

Re: P0300, P0301, P0306 codes
 
Quote:

Originally Posted by Strongjeff (Post 1008546)
Hmmmm.... not too many things left to check.

I know that is why I posted in this forum

Strongjeff 04-16-2014 07:24 PM

Does it blow smoke at all whether its blue or white?


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