Guys,

Guy I know has a highly modified 2000 Blazer ZR2, nothing really done to the motor and tranny though. He is building a truggy, basically took off the blazer body and put on the cab portion of a S10 and then making a tube body from there on out as the rest of the structure (http://www.zr2usa.com/mboard/index.p...ic=6366&st=600). Here's the deal, he just got his fuel cell and pump and all that jazz installed into the rear frame portion of the truggy. Problem is now that the truck won't start. Here's where he's at.

- He checked spark on the passenger side, and he has spark on all three passenger side plugs. He didn't check the drivers side.
- It'll start on ether, but without it, it won't run.
- He has fuel to the fuel rail, and the return rail is getting fuel.
- He doesn't have a fuel pressure gauge yet so I'm not sure if he is getting full pressure. I'm not 100% sure where his injectors are on this motor, so don't know how to tell him to check if he is getting fuel to the injector. His next step is to get a fuel pressure gauge here shortly. Of course just had identity theft, so he's having to deal with all the BS of that too before he goes and buys more tools..

I'm thinking it's some ground that he may be missing, but if that was the case I'm not sure how it would fire on ether at all.

Any ideas?

Andrew

 

Sounds to me like the pcm isn't pulsing the injectors. I would guess he needs someone to program the vats out of the pcm.

 

Wow, Dave's rig has changed alot...I used to have a ZR2 and remember him from the board when he first SASed it...sucks about the ID theft, freakin people these days.

The injector setup is like a poppet setup IIRC, like on the '96-'98 fullsize trucks. First things first, have him check the pressure and go from there. If it's firing with ether, I'd tend to think something in the fuel system isn't up to par.

 

Yeah, I'm thinking pressure as well, that gauge will hopefully tell later today. I don't think it would be the VATS since he hasn't put in a new PCM.

 

Got a carb fuel pump (7psi) instead of a fuel injection pump (55+psi). whoops!

 

haha that will do it right there!!!
Good to see yall got it all figured out!!

 

Ahhhhhhhhhhhhh!

Ok, got an MSD pump in there now that is good for 80psi. Has a fuel pressure gauge hooked up. Now it will fire for a second. Fuel pressure is solid at 60 the whole time. After that second it shuts down though, almost like it's running out of fuel. Two questions.

1) Couldn't be air in the lines could it? Pretty sure it's primed, but who knows at this point..
2) Could it be something with the return line? If the pump is sending 80 and the regulator is 60, could something be going on with the return line that would be causing this?

Andrew

 

sounds like the PCM theft control called VATS. turn the key to the on position (do not crank) and leave that way for 20-30min (put a battery charger on the battery so it does not die). After the 20-30min turn ignition off, then try to start it. That should reprogram the GM VATS.

 

Why would the VATS be the culprit if he is using the same PCM. He did pop it out once, but he put the same one back in. Not saying you're wrong, I'm just confused, especially since it will fire up and run for a second and then die. I thought with the VATS it woudn't run at all.

 

Is he using the original steering column?