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P0303 p0420

autojoe
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6 years 8 months ago #33213 by autojoe

P0303 p0420 was created by autojoe

2006 jeep liberty 3.7. Starts runs fine until you shut it off then with engine hot starts fine but under load misfiring mil flashing. If you don't shut off engine hot will not act up until you shut off restart and under load will misfire. If let set a couple hours will not act up. Any ideas? Thanks Joe

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ontheriver
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6 years 8 months ago #33215 by ontheriver

Replied by ontheriver on topic P0303 p0420

Pull plug on #3?what's it look like?

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Tyler
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6 years 8 months ago #33218 by Tyler

Replied by Tyler on topic P0303 p0420

I'd probably keep it simple and move the coil/plug. You might be hot soaking the coil enough to make it break down.

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autojoe
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6 years 8 months ago #33219 by autojoe

Replied by autojoe on topic P0303 p0420

All plugs and coil packs were replaced by the customer. What's odd is the circumstance in which it acts up.

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