bad random misfires p0300
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TECH Enthusiast
Joined: Mar 2002
Posts: 505
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From: NJ
bad random misfires p0300 just started misfiring one day. Misfires at idle, part throttle, and wot, but then goes away for 10 seconds and then starts running like crap, then runs like a raped date. Plugs and wires are fine. I'm going to atap for which cylinders are misfiring. car is basically stock. Any suggestions of where to look? 
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Joined: Apr 2003
Posts: 413
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From: Atlanta, GA
Just and FYI, I had almost exact problem however mine was due to a burnt O2 Sensor wire. It was shorting out against my header and causing my computer to think it was needing to send MAX amount of fuel possible causing it to stumble terribly, BTW Does it do it when it is cold and you first crank it and drive it? I found my problem with mine with AutoTap and once it entered closed loop it started stalling.
Thread Starter
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Joined: Mar 2002
Posts: 505
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From: NJ
narrowed it down to cylinder #1 only. Swapped plugs wires, injectors, and coils, never went away from cylinder #1 have over 80 misfires in the 60 second cycle of MISFIRES CURRENT CYLINDER #1. Friends a jeep/chrysler tech, hes gonna take it to work and dig deeper, looking at hard parts now.
Thread Starter
TECH Enthusiast
Joined: Mar 2002
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From: NJ
they are saying that they think its a burned valve that isnt seating. Said my cutoffs let air get in and burned the valve, i said bs, they are 2' off the collector from the long tube header.
miss fire Do a compression check, you may have broken valve spring. or pushrod
bent.
bent.
Originally Posted by Air21
they are saying that they think its a burned valve that isnt seating. Said my cutoffs let air get in and burned the valve, i said bs, they are 2' off the collector from the long tube header.
