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P0301 and P0300 Codes. running out of crap to change
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07-30-2010, 02:03 AM
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#1 | |
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Registered User
2010 JK Wrangler
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P0301 and P0300 Codes. running out of crap to change
2000 Jeep wrangler Sahara. 185000 miles.
Been chasing a P0301 and P0300 (cylinder 1 misfire and random misfire) for awhile now. What Ive done so far. Air sensor, cam sensor, crank sensor, new coil pack, new plugs, checked cat they said it was good, 6 new fuel injectors. I know the timing is completely controlled by the computer so it cant be bad timing. right? I'm thinking the fuel pump now and O2 sensors this weekend. After that im at a loss. This thing cant keep its engine light off long enough to pass inspection, so I dont know what to do. what next? Any tips you can offer to help narrow it down?
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07-30-2010, 02:27 AM
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#2 |
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Registered User
2010 JK Wrangler
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One more thought. is there suppose to be a paper spacer in the crank sensor?
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07-30-2010, 07:48 AM
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#3 |
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Registered User
2002 TJ Wrangler
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I would get some schematics of the engine wiring harness and start pin testing your wiring, its possible you have a frayed wire some where, or maybe a loose ground.
And a computer can only tell you what it senses is wrong, it cant diagnose itself so if your ECU is messed up, it wouldn't have the slightest idea so that could also be a possibility |
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07-30-2010, 07:55 AM
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#4 |
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Hired Yeti-Basher
 
2003 TJ Wrangler
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Yep. You need to check connections and wiring before you start replacing parts.
__________________
If it's worth doing, then it's worth overdoing. Jeeps are like strippers...they should be topless as often as possible. |
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10-01-2010, 10:44 PM
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#5 |
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Registered User
2010 JK Wrangler
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Still have not figured this out. Ive taken it to 4 different mechanics now all say its running fine.
WTF? this may be an excuse for a new engine. Got rid of the p300 now its only p301. What on earth would cause only cylinder 1 to misfire? |
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10-02-2010, 04:19 PM
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#6 | ||
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Web Wheeler
2000 TJ Wrangler
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Quote:
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Quote:
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10-02-2010, 05:11 PM
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#7 |
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Registered User
2003 TJ Wrangler
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Check plug wires too, small tear at boot will cause misfire might check at night to look for any arcs
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10-02-2010, 05:53 PM
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#8 | ||
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Web Wheeler
2000 TJ Wrangler
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Quote:
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Quote:
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10-02-2010, 06:08 PM
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#9 | |
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Registered User
1997 TJ Wrangler
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Quote:
curly
__________________
I start what I finish! |
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10-02-2010, 06:42 PM
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#10 |
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Senior Member
2006 TJ Wrangler
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try starting with the basics. compression test and a leak down check. 301 is related to only one cyl. is it eating coolant? how about pictures of the spark plug from #1 cyl?
steve |
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10-02-2010, 07:39 PM
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#11 |
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Registered User
1997 TJ Wrangler
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Try doing a compression test to make sure you don't have a blown head gasket. And maybe try doing a leak down test to make sure you don't have a burnt valve.
__________________
"When guns are outlawed, only outlaws will have guns." "Workers of the world UNITE! All you have to loose is your chains." Karl Marx. "My reading of history convinces me that most bad government results from too much government." Thomas Jefferson. "The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government." Thomas Jefferson. |
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10-02-2010, 08:33 PM
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#12 | |
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Registered User
2003 TJ Wrangler
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Quote:
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10-02-2010, 11:22 PM
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#13 |
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Web Wheeler
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Same here with #2 only. Any suggestions after two good compression checks and leak down within spec?
Going to swap injectors hopefully Monday. No time before then. Replaced everything in his list above as well, along with new cat, same deal. Best of Luck, Mike |
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10-03-2010, 12:57 AM
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#14 |
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Registered User
1999 WJ
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Had this in my old XJ 4.0... Here's what I did during my gremlin chase...
Plugs Wires Cap Cleaned MAP sensor Cleaned intake Cleaned TPS And nothing!!!! So here's what I found and the jeep was spitting out p0301 and p0300 constantly and had a bit of a rough idle when in gear at a stop... It was a short in the cylinder 1 fuel injector wire harness. I simply snagged one off a newer TJ in a pull yard and the problem suddenly stopped. It's not you're head..... Unless you're oils brown and thick. Just get yourself a long screw driver and put it on each fuel injector while it's running and make sure it's firing... You will be able to tell if it's not. Good luck!
__________________
On my 8th Jeep now! 98' TJ 4.0L, 2.25" bb, 33" Toyo M/T's, Cragar D windows and much more to come! |
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10-03-2010, 12:59 AM
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#15 |
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Registered User
1999 WJ
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Had this in my old XJ 4.0... Here's what I did during my gremlin chase...
Plugs Wires Cap Cleaned MAP sensor Cleaned intake Cleaned TPS And nothing!!!! So here's what I found and the jeep was spitting out p0301 and p0300 constantly and had a bit of a rough idle when in gear at a stop... It was a short in the cylinder 1 fuel injector wire harness. I simply snagged one off a newer TJ in a pull yard and the problem suddenly stopped. It's not you're head..... Unless you're oils brown and thick. Just get yourself a long screw driver and put it on each fuel injector while it's running and make sure it's firing... You will be able to tell if it's not. Good luck!
__________________
On my 8th Jeep now! 98' TJ 4.0L, 2.25" bb, 33" Toyo M/T's, Cragar D windows and much more to come! |
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| Tags |
| p0301, p0300, code, error, advice, tj, wrangler |
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