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Old 03-13-2012, 11:17 AM   #1
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Code P0121 and Bucking, this isn't good. Need Help.

Alright, driving to work today my 1999 TJ 4.0L lurched forward and threw code P0121. It's now slightly bucking, power is bogged down, and it gets significantly worse above 40mph. I put more oil into it, and drove it home to sit. Now I need some help on what steps to take.

I haven't done any recent engine work or electrical changes. However, I MAY have gotten water in the intake. I say may because I washed down the engine last night and washed out the K&N filter (I know ) and let it sit overnight. I forgot to check this morning, but it may be possible some droplets of water entered the engine . From here, what steps should I take?

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Old 03-13-2012, 11:37 AM   #2
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"Droplets" of water in the air intake won't cause an issue, no worries there. What is more likely is some water simply found its way into the ignition system where it shouldn't be. Odds are very good that with more driving, the moisture will evaporate from engine heat and the problem will go away.

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Old 03-13-2012, 12:09 PM   #3
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Definitely, thanks Jerry! I'm going to do an oil flush today and change my spark plugs and filter. I've needed to anyways, might as well do it now.
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Old 03-13-2012, 03:25 PM   #4
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Quote:
Originally Posted by burton160w View Post
Alright, driving to work today my 1999 TJ 4.0L lurched forward and threw code P0121. It's now slightly bucking, power is bogged down, and it gets significantly worse above 40mph.
You have a TPS DTC and you have symptoms typical of a bad (or wet) TPS. I don't think that I would be looking for water in the ignition system.
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