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#1 | ||
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Registered User
Join Date: Oct 2007
Location: Jeepville
Posts: 1,474
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Check Engine Light Error P0306 Cyliner Misfire
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White 2007 JK Wrangler X Silver 2000 TJ Wrangler Sport |
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#2 |
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Senior Member
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Are you the first owner with a delivery date on or after July 26, 2007?
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#3 |
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Registered User
Join Date: Oct 2007
Location: Jeepville
Posts: 1,474
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I am second owner. I bought it with 3,000 miles roughly.. Think there's a TSB? Where can I find production date?
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White 2007 JK Wrangler X Silver 2000 TJ Wrangler Sport |
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#4 |
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Senior Member
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You have posted a lot of information already. Is it generic OBDII info?
This is from the 2008 FSM for P0306: P0306-CYLINDER 6 MISFIRE Set Condition: The threshold to set the fault is application specific; it is tied to the level of misfire that will cause emissions to increase to 1.5 times the standard or in some cases 1%. It is always a two trip fault above the calibrated RPM. It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL. Possible Causes ASD RELAY OUTPUT CIRCUIT INJECTOR 6 CONTROL CIRCUIT COIL CONTROL 3 CIRCUIT IGNITION WIRE SPARK PLUG IGNITION COIL FUEL PUMP INLET STRAINER PLUGGED RESTRICTED FUEL SUPPLY LINE FUEL PUMP MODULE FUEL PRESSURE LEAK DOWN FUEL INJECTOR ENGINE MECHANICAL POWERTRAIN CONTROL MODULE (PCM) |
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#5 |
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Registered User
Join Date: Oct 2007
Location: Jeepville
Posts: 1,474
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I assume it is generic ODBII info... Would this be caused by me or just something that went whacko by itself?
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White 2007 JK Wrangler X Silver 2000 TJ Wrangler Sport |
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#6 | |
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Senior Member
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Quote:
Is it still running roughly? Pick out the items from the list that you can check. Some people have had problems with spark plugs. Put a new one in cylinder #6. Or, just swap it with one from another cylinder. See what happens. Get it scanned to see if there are any other codes set. If it's not running roughly, have them erase the codes and turn out the light. See if it all comes back. |
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#7 |
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Registered User
Join Date: Oct 2007
Location: Jeepville
Posts: 1,474
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Who has to erase the codes? Can Advance Autoparts do this? I know they can scan the computer. I haven't done any kind of maintenance. However I did recently spray the engine down with water but I always do this because it tends to get muddy ;x
I'm not mechanical at all.. I can change oil and air filter that's about it. It seems like it runs smooth, then kinda "misses" every few minutes.. but only while idling not while moving. Sounds fine running. There's sometimes slight vibrations. Sometimes when I shut off the engine the whole vehicle vibrates - but it's always done this since I had it..
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White 2007 JK Wrangler X Silver 2000 TJ Wrangler Sport |
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#8 |
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Registered User
Join Date: Oct 2007
Location: Jeepville
Posts: 1,474
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OK, so it won't report the error anymore. It just says ----- but the check engine light is STILL on - what does this mean? The error is null it just needs to be reset? How do I reset?
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White 2007 JK Wrangler X Silver 2000 TJ Wrangler Sport |
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#9 |
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Senior Member
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It could be some codes will not show with the readout on the instrument cluster. If there are other codes, that would be why the light is still on.
If the problem no longer exists, the light should go out after 3 good trips. Anyone with a scanner should be able to clear the codes and extinguish the light. Try disconnecting the negative battery terminal for a few minutes. That may extinguish the light. |
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#10 | |
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Registered User
Join Date: Oct 2007
Location: Jeepville
Posts: 1,474
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Quote:
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White 2007 JK Wrangler X Silver 2000 TJ Wrangler Sport |
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#11 |
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Registered User
Join Date: Oct 2007
Location: Jeepville
Posts: 1,474
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Engine lights went off today... didn't do anything to it. Just shut off. It wasn't giving the error code anymore so I have reason to think it was just a error in the computer or it just happened to "misfire" once.. seems good now :O
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White 2007 JK Wrangler X Silver 2000 TJ Wrangler Sport |
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#12 |
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Senior Member
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Has the roughness gone away, too?
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#13 |
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Registered User
Join Date: Oct 2007
Location: Jeepville
Posts: 1,474
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It seems too.. wonder what it was..?
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White 2007 JK Wrangler X Silver 2000 TJ Wrangler Sport |
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