CEL w/ Code cocktail - ideas? - JeepForum.com
 
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post #1 of 5 Old 09-19-2017, 08:34 AM Thread Starter
jezzra
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2001 XJ Cherokee 
 
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CEL w/ Code cocktail - ideas?

Any ideas as to the code cocktail on this one? Other than obviously multiple cylinder misfire... but the TPS high voltage as well:


P0123, P0300, P304, & P305


I s'pose at 252k miles, she could be due for a tune up, but I just purchased her Sunday (for a steal) and no idea when last tune-up was....

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post #2 of 5 Old 09-19-2017, 11:07 AM
CJ7-Tim
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Solve the P0123 first. Install fresh top quality tune-up parts, and use some injector cleaner in the next two gas tank fill-ups.

For best results, only buy genuine Jeep engine sensors, basic Champion spark plugs, and NTK O2 sensors.

.

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post #3 of 5 Old 09-20-2017, 02:37 PM Thread Starter
jezzra
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Thanks much! I def forgot to add, oil goes to 0 coming to a stop and check gauges flashes.... but it hasn't stalled.


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post #4 of 5 Old 09-20-2017, 04:12 PM
CJ7-Tim
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Temporarily install a mechanical oil gauge to confirm the dashboard oil pressure readings. Many Jeep 4.0 L engine have driven many miles with low oil pressure. Since you have a 2001, you should Google Cracked Jeep 0331 head, and do some reading about potential cylinder head cracks.

.

A recent Gallup public opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
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post #5 of 5 Old 09-30-2017, 07:38 PM
ar4130
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I have a 2001 and just dealt with a P0300 along with a P0301, P0302, P0304 P0305....lol. I replaced the coil pack and cleared everything except a P0304. I changed the plugs and the P0304 went away. I should have just changed the plugs when I did the coil pack, since I had the coil pack off and access to the plugs. Not a big deal, as the coil pack is pretty easy to remove (with exception of the plug, which can be a pain - its in a bad spot). I purchased the coil pack on amazon. It was only around 50 bucks with free shipping with Prime, as oppose to the Autozone one that would have been over a hundred. Running much smoother.

1997 XJ 6.5 mixed RC,OME,IRO w/ SYE.
2001 XJ 4.5 RC lift,JK Wheels w 32's
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