I was messing around with the comp box that I installed a few weeks ago. I started the truck, turned the comp box off using by using the button on the front of the box and drove down the road. The check ingine light came on so I turned the comp back on. As I came to a stop about a mile down the road, the motor revved up and down and then died. I turned the key off and then back on and it fired right up. Now the check engine light is staying on. What's the deal here?

Mark

 

check your ground. i moved the ground for mine to the front left fender (with the small battery ground lug). also, you may want to do the APPS reset procedure if you had the batteries disco'd for a while.

 

Sounds like it came unhooked i.e. bad ground same thing will happen if you unplug the plug on the bottom of the comp while its wired up, might need your light cleared but try to disconnect your battery for a bit like the previous poster said, truck will do funny things when you take off a comp

 

Do you have your boost elbow in the turbo?
If so when you turned off the comp you turned off the boost fooler telling the truck it did NOT go into Overboost,,, Cant drive with it off,,Must be on one at least. JMO

 

Yes, I have the boost elbow. Ooops! Well, now I know not to do that again. I just wanted to see how much of a differnce the box makes.
I unhooked the batteries for a while and just started it up. Check engine light is gone. Thanks for the help!

Mark

 

that's not true. the boost fooler works even with the box off as long as all of the connectors are plugged in. i've run ~35psi boost with the box off and no codes (yes, before the Smarty was on as well). besides the grounds, check the pins on the connector on the back of the controller. i've seen bent pins from the cable connector being forced on with one of the pins not lined up.

 

Thanks Beast2B. I'll check all connections this weekend. Seems to be running fine now.

Mark

 

yea when mine comes unhooked thats what it does

 

What code did it set? That is going to give you lots of information. Probably even tell you exactly what happened. If you havent had it scanned it would probably be a good idea.

 

I don't have the tool and my local auto parts place (Kragen) said they won't scan it for me. And I'm definitely not taking it to the dealer. Any suggestions?

Mark

 

turn the key on and off real fast 3 times and on the 3rd time leave the key in the on position then look where your odometer is and see what code it is sayin.

 

aggiehorsepower, I don't think my '99 has that option. I tried that about a year ago and it didn't work. Someone on here said it wouldn't work with the '99.

I had the same problem as I left work today. Check engine light came on and she died as I came to the stop light. I turned the key off and it started right up. I'm going to check all connections this weekend.

Mark

 

Yeah the key trick won't work on a 99, that didn't start til 00 or 01 can't remember which. If you haven't already done so you might try running your ground directly to the battery, sounds to me like you might have a bad ground connection.

 

I have it grounded to the battery. I'm going to try grounding it to another spot today.
Wish I would have never turned the comp off while I was rolling down the road.

Mark

 

Hey Dont worry about it ,, The light will go out,,
Cant get any better grounds than going to the battery,, Just dont shut the comp off while driving anymore.