I just finished up my cam headers and stall install and went to fire my truck up. The first time it fired up just fine. But I turned it off and tried to start it again and it turns over and just dies. Anybody know why it's doing that or what it could possibly be? Also my speedometer is pegged out and won't move but all other gauges work fine.

 

Check your grounds

 

Okay we'll I will have to do it tomorrow but it will be the first thing I check.

 

2nd that ground check since you pulled the tranny. Look for broken wires.

 

What year is the truck??? It might need to relearn the Idle with the changes you made.
You may have to give it a little throttle to get it started and keep your foot on it and slowly let off untill you get to the point were it will Idle.

Your also going to need a tune.

 

the truck is a 99 5.3. here is a link to my build log https://www.performancetrucks.net/fo...builds-511827/
i know i need a new tune

 

Not saying this is it but make sure you didn't pinch or cut the cranks sensor wire harness when installing the trans. I've seen this happen.

 

the thing is we never pulled the trans. we pulled the motor. and im pretty positive that no wires got pinched anywhere but im bout to be heading to my shop to check the grounds and while im there i will try and see of any wires got pinched any where else.

 

I had the same thing happen with my cam install. I had a blackbear tune and it fired right up but had a nasty/rough idle. I swapped the computer for the new tune and it ran pretty good, but I still wanted to make some changes. Swapped the computers again, and it would crank but wouldn't run or idle.

update your tune.

I was just down that way in Santa Fe during Christmas.

 

okay well i will try and get a tune this weekend from a guy up the road here that has a dyno.

and santa fe is literally right down the road from where i live i got some family in santa fe.