P0300 random misfire codes - DODGE DAKOTA FORUM - FORUM AND OWNERS CLUB!
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  #1  
Old 12-12-2018, 06:56 PM
Corndogg69 Corndogg69 is offline
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Default P0300 random misfire codes

I bought this dakota and every once in a while I would drop a cylinder for a second or two. The check engine light would blink, then it would pick back up and be OK. rarely. My brother in law just washed the motor with a power washer and it pretty much does it all the time now. Picks up every once in a while, but mostly misses.

I would know where to start, if it was one specific cylinder, but it says the P0300 code which is random. I suppose I could start with new plugs.

Is it OK to continue to drive, or should I park it until I can have it looked at?

Please help
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  #2  
Old 12-15-2018, 02:37 PM
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matthewb1982 matthewb1982 is offline
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Ive had similar problems with my 07. Throws 335 300 and one for the tps. Ive replaced ckps cps and tps, and it still throws codes. I cant hear a misfire or dont think i can. Had a small vac leak and fixed it. Id like advice with this as well.
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Old 12-17-2018, 09:25 PM
Corndogg69 Corndogg69 is offline
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Default Still working on it.

We found a bad coil on #3, replaced it. Then we put in 6 new plugs.
Miss was still there and engine was still falling on it face. Ran the truck down the road and after 10 miles or so it begin to improve.

Miss still there at times. LIke today it started missing and fell on it's face two times. Once for about a quarter mile and again for about 2 blocks. Other than those to instances, it runs great. Back to intermittent now.

Would really love to fix it full time. Truck has 275,000 miles on it and is using oil. We thinking that maybe one cylinder might be fouling out a plug every once in awhile, but the miss is on and off kinda like turning on a switch.

Any ideas would be appreciated.
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  #4  
Old 12-20-2018, 02:24 AM
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MoPar Penguins MoPar Penguins is offline
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My suggestion, 1st reset the PCM by taking the negative terminal off the battery. Since you put in all 6 new plugs, that's probably not the issue. It could be anything from a single coil, to a very bad wire. If you have the old plugs, you could try reading them. But you'd have to match a single plug, to a particular cylinder. You might try doing a compression test. Low compression in a specific cylinder could indicate your oil leak, which might solve the ignition problem. Otherwise PCM replacement. The PCM seems to be a common problem once 100,000 miles are reached.

Good luck!
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Old 12-24-2018, 05:05 AM
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Plus youll really want to check for vaccum leaks, that will cause a random misfire. Check the ckp sensor and cmp sensor as to those will also cause a misfire, although it would add in the additional codes as well. If you suspect the ckp "crank position sensor" or the cmp "cam position sensor" double check the voltage and inspect the wiring itself, i just finished up my trouble codes and it was the harness to the ckp, it was burnt since it ran around the cat and the cyl head, what a pain the the ass that was,
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Old 12-26-2018, 01:37 PM
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Ps, my 07 4.7 just got fixed. The wires on the crank pos sensor were burned. The sleeve was cracked back behind the catalytic and all three wires were touching was throwing 0300 and 0335. Might wanna inspect the harness,
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Old 02-04-2019, 01:53 PM
Corndogg69 Corndogg69 is offline
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I bought 6 of this cheapo ignition coils off e-mail and replaced all the coils except for the one I replaced on #3 earlier. That seems to have fixed the issue. Engine runs like a sewing machine now. Thanks for all the reply's it could have been any of that stuff.
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Old 02-05-2019, 12:04 AM
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MoPar Penguins MoPar Penguins is offline
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I'm glad you got your Dak running good. In my opinion Dak ownership is a type of brotherhood, and or, sisterhood. Probably wouldn't be a bad idea to get a cheap OBD 2 reader. I've discovered it's not uncommon for a Dak to throw a phantom check engine code. At least then you know what the engine is proverbially pissed about.
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