P0300 which plug is it
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
P300 would indeed be a random misfire----codes like P304 P305 etc would indicate a known cylinder misfire.
You may have a faulty wiring connection or perhaps the crank position sensor is causing this?
Might have to do some digging into the wiring to see if the problem exists there.
You may have a faulty wiring connection or perhaps the crank position sensor is causing this?
Might have to do some digging into the wiring to see if the problem exists there.
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
It helps a lot if you actually identify specifically what you're working on.
A P300 means the PCM can't determine the misfiring cylinder accurately or there are multiple misfiring cylinders. Your best bet is to go in and look at the misfire count PIDs in mode 6, test 53 and see if you can get more data. Other faults such as a weak cam sensor or EGR system problems can also cause problems.
A P300 means the PCM can't determine the misfiring cylinder accurately or there are multiple misfiring cylinders. Your best bet is to go in and look at the misfire count PIDs in mode 6, test 53 and see if you can get more data. Other faults such as a weak cam sensor or EGR system problems can also cause problems.
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Logistics Pro
Joined: Sep 2010
Posts: 4,411
Likes: 4
From: Victor, MT
I have no idea what PID means nor do I know what test 53 is. Can you guys further explain it??
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Logistics Pro
Joined: Sep 2010
Posts: 4,411
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From: Victor, MT
Got it to throw another code. Cylinder 4 misfire. Now what do I do. There are no other codes besides the two. What do I do now??
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New User
Joined: Feb 2014
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Same problem P0300
Same issue with a 99 F250SD V10. Getting P0300 and P0308. Changed the COP and plug on #8 and still getting the P0308. Found the double split PCV elbow hose in front of the TB and replaced it. Cleaned MAF and ran a tank of gas with Sea Foam. EGR was just replaced by dealer a couple of months ago. LTFT is good but STFT has a delta of 20% plus. Any other ideas?
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Whole bunch of things.
PCM, wiring harness and connectors, injector, base engine mechanical concerns (intake leak, valves, rings, other faults, etc), to name most of them.
PCM, wiring harness and connectors, injector, base engine mechanical concerns (intake leak, valves, rings, other faults, etc), to name most of them.