Any clues as to why when I start my truck the guages max out and then back down and then start working?

 

This happens when the PCM resets or you disconnect the battery.
Get a new battery and check your alternator/wires.


Fritz

 

Fritz is right on. The pcm is reseting itself. The battery is on it's last leg proably, and during starting the voltage is dropping down to the point where the pcm resets. Be sure your battery post are clean and tight. And if that's not it, it's battery time.

Good luck!

Gene

 

New battery fixed the problem!

Thanks for the input!

 

Is it normal for a Pontiac Grand Am to do this also? I think it's a 98, I saw my friends do that, but I didn't know if it was normal for a Pont. to do that too.

 

A lot of the newer GM's do that...trying to look cool, I guess

 

yea, ford does it when ever battery is applied, gand am does it when ever ign. is applied. (instrument guage sweep test) function of the pcm.

Gene