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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

P0303 p0420

  • autojoe
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6 years 4 weeks 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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6 years 4 weeks 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 4 weeks 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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6 years 4 weeks 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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