CEL p0420 and p0430 help pls - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 10-07-2014 Thread Starter
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CEL p0420 and p0430 help pls

i was wondering if these codes would have anything to do with my car running rough until it gets warmed up. my car have an off road h pipe and flow master mufflers has any one else experinced this in ther car thanks

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post #2 of 5 (permalink) Old 10-08-2014
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The off-road h pipe removes the converters. The codes are present due to the converters not being there and I am assuming that you dont have a programmer to turn off the rear o2s. The running rough until the car warms up could be a number of different things. I would look into a possible idle air control valve or a MAF sensor. I had an off road h pipe on my 02 mustang gt and a off road x pipe on the 03 gt and never had the codes you have with mine. Pick up some seafoam from walmart or a auto parts store and run half a bottle through a vaccuum line going into the engine and the other half going into the gas tank itself. Hopefully this helps. Good luck on your hunt but until it throws other codes the 2 codes you have wont cause the issue.


2003 Mustang GT Convertible 5 speed - Mostly stock 4.6... 455 rwhp and 573 ft/lbs torque. (SOLD due to divorce)

Currently working on Coyote Swap of a 2004 GT
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post #3 of 5 (permalink) Old 10-08-2014 Thread Starter
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The owner before me has put a maf sensor from like a 96 mustang on the car I know on that year model the maf and iac sensor are separate one 02 they changed it out to were the maf and iac are together would that have anything to do with it
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post #4 of 5 (permalink) Old 10-08-2014 Thread Starter
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The owner before me had changed the maf sensor out from a 96 model and had to cut the wiring to add in the iac sensor my car is a 02 model I know the maf and iac is made together would that possibly have anything to do with it
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post #5 of 5 (permalink) Old 10-08-2014
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That would make it have a code for the intake air temp sensor.

2003 Mustang GT Convertible 5 speed - Mostly stock 4.6... 455 rwhp and 573 ft/lbs torque. (SOLD due to divorce)

Currently working on Coyote Swap of a 2004 GT
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