MISSING AND BACKFIREING THROUGH INTAKE!

eaton34 · #1 (**permalink**) 02-01-2008, 01:37 PM

Truck has been running good untill now! Started the truck up and it started backfireing through the intake and making an almost like pinging noise! WTF??? HELP PLEASE!

95and05 · #2 (**permalink**) 02-01-2008, 02:51 PM

sounds like valve problem to me

but heres a

anyway

eaton34 · #3 (**permalink**) 02-01-2008, 03:31 PM

Thanks man...anyone else??? My buddy will scan tomorrow and I will hopefully have a code or two to pull.

dirtjumper8786 · #4 (**permalink**) 02-02-2008, 06:18 AM

what year is it? you actually may have dropped a rocker. they do that actually quite a bit. not to big of a deal just replace the rocker assembly.

eaton34 · #5 (**permalink**) 02-02-2008, 10:04 AM

My truck is an early 99 with a wm chip, staight pipe, diy intake, fpr shim and wastgate pluged. Any other options??? thanks again fellas

eaton34 · #6 (**permalink**) 02-03-2008, 12:45 PM

So just pulled some codes and they are as followes...po 541 and po 640. anyone know what they mean? thanks

95and05 · #7 (**permalink**) 02-03-2008, 01:57 PM

PO541 Manifold Intake Air Heater
P0640 Manifold Intake Air Heater

**Dirk** · #8 (**permalink**) 02-03-2008, 02:30 PM

Those codes won't cause your problem. Those codes are because you don't have the AIH on the early 99. Time to pull the valve covers and do some detective work.

EDIT: sounds like you changed out your PCM.

eaton34 · #9 (**permalink**) 02-03-2008, 06:33 PM

i know i was hoping it was something easy, which it still could be. i will be taring into it tomorrow night...i hope! i will keep you informed!

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