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2006 gmc sierra 4.8 4X4 no crank


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Ok, here we go. My neighbor has a 2006 GMC Sierra 4.8 4X4 that he was installing a " tornado " fan in front of the MAF. Started the truck and forgot to plug the MAF back in prior to starting the truck. Said the truck started, ran like crap, then stalled. Now wont crank at all. There are no codes stored in the PCM, no signal to the starter, and the headlights and gauges do not dim or drop when you turn the key to try to crank it.

Also, this trick is a base model with no security system so there is no exciter ring for the key. Any ideas?

I've swapped the ignition relay, tapped on the PCM and ignition module to no avail.

Battery is new and has been checked and rechecked, starter has been removed and checked and all show good.

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Ok. Now being told he has a bully dog system on the truck as well that plugs into the PBS 2 connector that was plugged in when the truck stalled. It wasn't when I went to check codes on the truck of course.

Still not sure why it wouldn't have thrown a MAF code since he started it with the MAF unplugged

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Never mind. . . I got it. The dumbass ran the "tornado" into the bottom of the fuse block under the hood and it acted like a generator and over amped the under side of the ignition max fuse , welding the contacts together and shorting the relay to where it stayed open.

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Yeah. This guy wants his 4.8 4X4 to be some "hot rod" and lays all these aftermarket electrical wires over the motor, pinched in the door jams, plugged in to just any location that shows power with a test light and wonders why he is always having to come over to me to get it running again.

He has the odasity to think that it's something that I'm doing to his truck.

Folks, if you don't know what you're doing. . . Please don't mess with it

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Come on dude, I saw a guy with two installed and it netted him 100hp and 120tq to the rear wheels!

You only get that if you install a throttle body spacer too. :lol:

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The only thing those things add is voltage and amp drain. If the little fans aren't spinning, they suffocate the air intake to the point the MAF will throw a code and the truck runs like crap. Not to mention, if the installer runs wires over the engine, through door jams, power plugged into wherever he can find 12 volts. Never mind if it is on a fusible link, amperage specific, it plugs them into both terminals where a fuse was supposed to go.

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