I would start small and work your way to the rail, you dont want to spend it if you dont need to .
Change plugs if that doesnt help try changing the plug boots before you go for the rail.
The code is for #3 misfire. I am going to change the plugs as they have probably 50,000 miles on them and just over a year in use. I was wondering if I should change the coil pack rail also. 218,000 is a lot of miles.
Don't know if I want to change the coil pack. $179.00 at NAPA. Ouch.
Last edited by airforce26yrs; 04-03-2009 at 13:02.
I'm Mike, make sure you spell it right, because I do not want to get the wrong A$$hole in trouble.
If you do not have time to do it right the first time, how do you have time do do it over?
www.jeepforum.com michiganmaveric
I would start small and work your way to the rail, you dont want to spend it if you dont need to .
Change plugs if that doesnt help try changing the plug boots before you go for the rail.
I'm Mike, make sure you spell it right, because I do not want to get the wrong A$$hole in trouble.
If you do not have time to do it right the first time, how do you have time do do it over?
www.jeepforum.com michiganmaveric
Here are the possible problems:
INTERMITTENT MISFIRE
VISUAL INSPECTION
IGNITION WIRE
(F42) ASD RELAY OUPUT CIRCUIT
ENGINE MECHANICAL PROBLEM
IGNITION COIL
COIL CONTROL CIRCUIT
SPARK PLUG
CHECKING FUEL PRESSURE
CHECKING FUEL LEAK DOWN
FUEL INJECTOR
INJECTOR CONTROL CIRCUIT
If you would like a copy of the FSM troulbe shooting proceedures I can email them to you.
Mat
I'm Mike, make sure you spell it right, because I do not want to get the wrong A$$hole in trouble.
If you do not have time to do it right the first time, how do you have time do do it over?
www.jeepforum.com michiganmaveric
I had the same code pop after a radiator hose blew on me. I found a TSB 1803103 that addressed the issue for one of the reasons you can have a P0303 come up. Has to do with how gases escape from the catalic converter.
I was having rough engine idle after restart following the hot soak. Are you experience any of this or a rough idle? I looked into getting the shield that the TSB said to replace, but they could not find it. I replaced the plugs and cleared the code and it's never come back. Plugs I took out needed changing, but were in overall good condition.
I found during my research the coil pack is good for a "long time", but you do have a lot of miles on it. Hope that helps.
I'm Mike, make sure you spell it right, because I do not want to get the wrong A$$hole in trouble.
If you do not have time to do it right the first time, how do you have time do do it over?
www.jeepforum.com michiganmaveric
Another option can be a bad spark plug, resistance failure. The wife's was throwing P0305 (cyl 5). I swapped the wires to see if wire or plug. Same cylinder w/ issue. Replaced plug (champion), no problems since. It was intermittent, not constant code.
I think your kind of rail, the coil pack services 2 plugs each. You should be able to remove 2 and just swap their positions on the rail. If the code moves to another cylinder, then it's coil related, if stays on cylinder, it's plug related.
Dan M.
'85 CJ-7, 4.0L,T18,4.10s,35s,Fully locked,winch,cage
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