puzzled

[baloo]

I thought I would post here too, you 40 45 and 55 folks might have an idea too. Thanks for the help.

Ok I am confused again/so more. I replaced a dead alt, even tested bad, and while driving Yesterday the engine just stopped. I started pulling over and shifted to neutral still nothing. When I stopped I Put it in park nothing, no clicks no fuelpump whine, nothing. I am thinking a neutral safety switch. So I poke around the transmission wiring get in still nothing. Try messing under the hood nothing, then out of the blue I turn the key and it works. Start home happens again but before I can stop I shift to neutral and it starts no problem.
Get home dies again, try all of the usuals nothing. Go in to turn on the drive way lights come back it starts. So whats wrong? Over a year ago I put a Vortec in with a 4L60E it has been the usual little bugs getting it to 100%. Now this, is it the nuetral safety switch? The ignition? The Land Cruiser gods pissed at the chevy? IF you shift to neutral or park there are no sounds just like trying to start in gear and the neatral safety switch kills everything. ANy one had similar puzzles? Thanks for the input. Ya know I don't think I'll ever get this thing done!!!

 

[e rock]

A neutral safety switch won't kill the motor while it's running.

That's all I got - good luck.

 

[baloo]

Damn that sucks to know that is an easy fix. Thanks

 

[woody]

possibly a bad/loose connection to the 'puter, either the ground or the constant-hot wire?

I've read that you need to be VERY sure the 'puter is grounded well...mine is, and I've never had an issue.

 

[TJDIV]

first thing that comes to mind is a bad ground.

I've had it happen after wiring stereo's to an aux. hot term. and not grounding out good enough. it'll kill the whole truck.

ignition? good luck.

 

[Jetboy]

I think I have a solution. Fuel Pressure!!! Vortec engines are EXTREMELY sensitive to fuel pressure. they need to be at 60psi I believe. Check the specs, but 5psi drop and it shuts down, so even if it seems as though you have good pressure from your fuel pump it may not be correct. You should put a pressure meter on your fuel line that runs into the cab(may be over kill but that way you can monitor it while you drive). The tire shop/ light mechainical place I work at replaces at least 2-3 Gm fuel pumps per week and sometimes more. Same simptoms. Hope that helps.

 

[zebrabeefj40]

I've had a bad battery cause similar problems on my old TBI'd 2F. But I'd also get a blown charge fuse whenever the truck went dead. The battery had a few loose plates from an accident and general wheeling beating and bashing. The plates would short against each other and poof - dead truck...

If it's the fuel pump, the next time it goes dead get out and pound the fuel tank with the key on and see if you can get the pump to start whining. If beating on the tank gets it going then you'll need to replace the pump. Had one of those leave me sit too...

Good luck!

Nick Jennings