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P0302 On An ,01 Tj (2.5L)


mjeff87
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My TJ has started acting funny the last couple of days, after a trail ride on Saturday. On cold-starts only, it misses like crazy for about 20 seconds, then smoothes out to a nice normal idle. Drives fine afterward until I park it for an hour or so and restart it. Same miss again for about 10 seconds, then normal. Garaged it last night and did the usual PMCS on it (pulled/checked plugs, cap/rotor, wires, cleaned TB and IAC, checked all vaccuum lines and electrical connections, checked manifold for vac leaks). Found some carbon on the posts in the cap, cleaned and reinstalled, other than that everything looked fine. Coolant in overflow smells a bit like fuel to me (weird), oil is fine. Same problem starting up this morning and it threw a CEL finally on the way to work.

 

At this point, I'm thinking one of 2 things.....sticking injector on #2, dribbling fuel into cylinder while off or a bad lifter on #2 that is slow to pump up on startup. What is weird is that the miss goes away quickly and it runs fine otherwise. I don't hear any tapping that would be associated with a collapsed lifter, and the exhaust does have a strong fuel smell while it's stumbling.

 

Any ideas? I might pick up an injector on the way home and swap #2 out tonight and see what happens, but I don't like throwing $$ at something without knowing the problem.

 

Jeff

 

*edit* P0302 code is for a #2 misfire....

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yeah....barely made it home from work last night. It's either a blown headgasket or a cracked head (my money is on a crack). Tearing into it tonight to diagnose and begin repair.

 

Merry Christmas to me......fist%20shake%202.gif

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spectacular head gasket fail......siamese blowout between #2 and #3. Surprisingly the head looks ok, but I'm gonna take it to a shop tomorrow to have it checked and reuse it if it's ok. The fail point was exactly where the crack in my exhaust manifold is, I imagine it was getting worse over the last couple of months and just finally decided to let go yesterday. Ooops....

 

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you can't tell from the crappy pic I took, but there's about 3/4" of coolant in each of those 2 middle cylinders....I bet I'da hydrolocked the damn engine if I tried to start it after I parked it last nite.

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