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Old 08-01-2010, 10:45 AM   #1
Join Date: Jul 2010
Posts: 5
Check engine multiple misfire, then radiator cracked

OK so changed spark plugs reset engine light went off, drove 80 miles radiator cracked cylinder misfire came back and the code changes every time its reset to p 0304 , p 0302, p 0301, p 0305 it flip flops back and forth those codes? Then i got the gas cap code switch the gas cap it seems to have done the trick.

why did my radiator crack? it looked bad inside it was brown. a mechanic told thats a sign of the jeep being mistreated or beat to hell on a trail?

he wants to replace water pump, alternator, and thermostat. anything else he should replace or should i hold back on anything if the work fine?

Is a cylinder head cracked?

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Old 08-01-2010, 04:33 PM   #2
Join Date: Mar 2010
Location: Central Florida--Used to be Central IL
Posts: 200
So you changed the plugs _then_ the misfire started? Or they were happening before and you tried changing plugs?

The TJ radiators are known to self-destruct at some point, doesn't seem to matter how you treat it. Some of the long-life antifreezes leave bad-looking colored stuff.

I have no idea why they want to replace the alternator. If it were me, I would change out the radiator, and probably change the water pump, thermostat, and heater hose outlet that goes to the pump, just since I had it torn down. You shouldn't _have_ to do those just because the radiator cracked though. Also, you can't rebuild these radiators in any fashion, so I would go for a well-made aftermarket one rather than an OEM-style.

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Old 08-01-2010, 06:09 PM   #3
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Join Date: Nov 2009
Location: Sacramento
Posts: 95
I would also do further testing (leak down) to insure there isn't a head gasket issue.
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check engine light , cylinder head , help wrangler , misfire

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