CEL codes p0351 and p0301 - JeepForum.com
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post #1 of 28 Old 04-17-2012, 10:42 AM Thread Starter
JaikYJ
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CEL codes p0351 and p0301

I hate to do this but I have searched alot of threads and havent found a difinitive answer yet.

I keep getting these two codes. I have a code reader so everytime I try something to fix it I clear the codes and they end up comming back within 15 miles.

Things I have done so far -

Replaced Cap and Rotor, old ones had some corrosion but that didnt seem to solve anything.

I swapped plug and wire #1 with #5, trying to see if the problem would follow but it did not.

I bought throttle body cleaner and took off my TB, TPS and intake and cleaned them really well. Didnt work. I recieved a spare intake and throttle body from a friend so I changed the TPS to see if that was the problem, Still the same two codes are reoccuring.

I checked my plugs going into the ECM and cleaned them up, made a small retainer to put abit more pressure on the plugs to ensure they wouldnt wiggle loose and cause a break in the connection. No change

I have an MSD ignition upgrade with MSD coil pack that is fairly new so I don't think that is the problem.

I have spare injectors that came with the spare intake so I will try changing the #1 injector just to rule it out.

Those are the only 2 codes I am getting and I don't know what else really to do. If I can find a multi meter I will test the MSD coil, should it get the same readings as an OEM coil if I test it?

Thanks guys,
I know there are other threads that have similar problems but they are showing other codes as well so I thought it would be ok to start a new thread.

Jaik


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post #2 of 28 Old 04-17-2012, 02:09 PM
Rubi4MyMrs
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If you still have the OEM coil I would try putting it back on & see if that changes anything. With non-OEM products there can be compatibility issues. Not sure how that relates to the P0301 code but who knows?
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post #3 of 28 Old 04-17-2012, 04:40 PM
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Did you have a problem that lead to the coil upgrade?

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post #4 of 28 Old 04-17-2012, 06:31 PM Thread Starter
JaikYJ
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Hey guys thanks for the quick replies, I just bought the TJ last week. So I don't have the OEM coil unfortunately. I wish I did so I could swap to try it out.
My buddy that has a TJ has an 02 with the coil rail so I can't even swap with him to see if that would make a difference.

Update
I swapped the injector on cylinder #1 and cleared the code, nothing changed it is still giving me p0351 and p0301.
All the injectors looked really clean, there was bait of carbon buildup where they seat themselves on the intake so I very carefully cleaned it all with gas and q-tips.
I also got the engine warm and poured some seafoam into the crankcase.

Sorry I never thought to mention that I do not have the OEM coil, but that is a good piece of information.

Thanks for your help.

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post #5 of 28 Old 04-17-2012, 07:25 PM
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Was the CEL on when you bought it? Can you contact the PO to get any more info? Wouldn't hurt to check the compression. Some '97s had valve spring issues that lead to carbon build up & low compression. There is a TSB on decarbonizing the cylinder head chambers. I think Jerry Bransford has info on that. Might PM him.
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post #6 of 28 Old 04-17-2012, 07:59 PM Thread Starter
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It was on when I bought it. The PO was a young kid that only had it for 3 months because he took it offloading and was full throttle when he tore two of the rear control arms off and broke the t-case. He couldnt afford the shop labor to have someone fix it so i got the jeep really cheap. So he won't have too much info.
I did read that thread that your talking about. If I have to then I will go that route.

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post #7 of 28 Old 04-17-2012, 08:00 PM Thread Starter
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Double post. Stupid iPad

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post #8 of 28 Old 04-17-2012, 08:32 PM
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A good technician never blames his equipment! Seriously though, the P0351 makes me think electrical & still don't know if the 2 are related but seems a rather odd coincidence they are both coming together. If you do happen to have a compression tester I would check that but I would concentrate on the 351 & see if eliminating that will also fix the 301.
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post #9 of 28 Old 04-18-2012, 12:52 PM Thread Starter
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Update
I went to Napa and bought a new coil. I got about 10 miles before the same two codes popped back up. I keep getting my hopes up thinking the CEL won't come back on but it never fails to shine bright.
I hope Napa will take the coil back.. If not now I have a spare.

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post #10 of 28 Old 04-18-2012, 01:11 PM
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A crank angle/cam sensor mismatch can fool the computer and it will throw 301 codes. If the PO moved the distributor and its not within range the computer can interpret that as a misfire and dwell time code because the coil is not firing when its expecting it to.

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post #11 of 28 Old 04-18-2012, 02:14 PM
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That makes sense but won't that normally throw a code like a P0016?
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post #12 of 28 Old 04-18-2012, 04:01 PM Thread Starter
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Quote:
Originally Posted by Coolcatracing View Post
A crank angle/cam sensor mismatch can fool the computer and it will throw 301 codes. If the PO moved the distributor and its not within range the computer can interpret that as a misfire and dwell time code because the coil is not firing when its expecting it to.

Thanks again for replying guys.
How would I check that? Would I adjust the timing?

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post #13 of 28 Old 04-18-2012, 04:49 PM
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That's just it, you can't "adjust" the timing. The ignition timing is controlled by the PCM. What coolcatracing is referring to is the fuel timing & the fuel injection timing is set by the position of the distributor. The distributor can't be moved because the hold down bolt goes through a fixture built into the housing & there is no room for adjustment. The only way that can be off is either the distributor is in one tooth off or the timing chain is stretched or the cam was installed a tooth off. Not sure but I doubt it will run well with the distributor a tooth off.

If you want to read about all this here is a link to the online-read only FSM. Timing the distributor is in the ignition system section & the cam timing is in the engine section.

http://www.jeep4x4center.com/knowled...ex.htm#service
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post #14 of 28 Old 04-18-2012, 05:09 PM Thread Starter
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Thanks Rubi4MyMrs I will read that through.

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post #15 of 28 Old 04-19-2012, 08:50 PM Thread Starter
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Alright with the Napa coil the jeep seemed to run worse. It would chug like it was going to stall. So I put the MSD coils back in and it runs better but it still has a miss and the codes are still present.

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