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  #1  
Old 02-11-2014, 06:45 PM
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P0300 which plug is it

Which plug is misfiring. It says random misfire. Which plugs going to hell on me?? Truck has 130k on it
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  #2  
Old 02-12-2014, 09:14 AM
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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.
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  #3  
Old 02-13-2014, 01:07 PM
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Hmm, what Is a CMP sensor? I was told that was a possible cause....but I have no idea what that is.
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1984 F250 6.9l N/A 212,000 miles Wrecked 26 Oct 11
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Old 02-14-2014, 08:47 AM
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Not sure what the CMP sensor would be----I'm still of the thought this is a wiring problem relating to the crank position sensor though.
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  #5  
Old 02-15-2014, 11:36 AM
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CMP: Crankshaft Monitoring something.....
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1984 F250 6.9l N/A 212,000 miles Wrecked 26 Oct 11
1990 F-350 7.3l IDI ZF-5(sold)
2000 F-250 6.8l Triton V10 209k miles
2006 F-250 5.4l Triton V8 129k Loaded XL
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Old 02-16-2014, 05:29 PM
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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.
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Old 02-22-2014, 09:53 AM
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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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Old 02-23-2014, 01:32 PM
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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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1984 F250 6.9l N/A 212,000 miles Wrecked 26 Oct 11
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2000 F-250 6.8l Triton V10 209k miles
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Old 02-23-2014, 05:02 PM
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Start with fixing the #4 misfire.
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Old 02-25-2014, 10:41 PM
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How do I go bout fixing it? SHould I just replace the COP and the plug??
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1984 F250 6.9l N/A 212,000 miles Wrecked 26 Oct 11
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2000 F-250 6.8l Triton V10 209k miles
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Old 02-26-2014, 06:49 AM
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That works about 90% of the time.
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Old 02-26-2014, 09:59 PM
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what about the other 10%. What else could it be?
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1984 F250 6.9l N/A 212,000 miles Wrecked 26 Oct 11
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2000 F-250 6.8l Triton V10 209k miles
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  #13  
Old 02-27-2014, 08:47 AM
BOSSHOGG250SDV10 BOSSHOGG250SDV10 is offline
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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?
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Old 02-27-2014, 09:19 AM
projectSHO89 projectSHO89 is offline
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Quote:
Originally Posted by Aune163rd View Post
what about the other 10%. What else could it be?
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.
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Old 02-27-2014, 09:44 AM
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Yep the last 10% is really hard unless you get lucky and not to mention time consuming. I may swap the #8 fuel injector to see if the misfire moves. After that it will be off to the Ford dealer!
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Old 02-27-2014, 09:44 AM
 
 
 
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