engine help please

[1sik7t2]

ok,heres the deal as some of you know,i'm doing a engine swap in my burb,a 2005 lq4 6.0 litre....from a gmc savanna.... "project Dirty Burb" got power to the new fuel pump fuel line ran, no return line on this 1 all hooked up but it wont start unless sprayin carb cleaner into the intake.... only thing i can think of is vacuum lines need to be hooked up or .. the mass air flow hooked up to the throttle body....it hasnt been the last few times i tryed....my garage smells really really bad from the gas fumes, terrible like it's only tryin to run on fuel,,,,,thats y im thinking the mass air flow.....anybody a chevy expert...or really know your chit PLEASE HELP thx dave

[vectorit]

I'm gonna move this over to the Engine/drivetrain side of the house, where you will get the right eye's on it for ya.

[JFP Motorsports Div]

"Anti-theft devices may also be used to deactivate the fuel pump if the vehicle security or anti-theft system detects any type of tampering associated with vehicle theft. In the case of many General Motors vehicles, the engine will momentarily start and stall if the anti-theft system deactivates the fuel pump relay. Other anti-theft-related problems include defective ignition keys or key detection systems in the ignition switch" - Counterman Magazine

Read this: http://www.counterman.com/Article/82...y_systems.aspx

It will help you understand the modern fuel system and hopefully point you in the right direction... or hint you of a possible cause.

Good luck

[1sik7t2]

ok i'm back, i think ok so here's the newest update eng/wiring wise....burb starts, runs....but wont turn off..has to run out of gas to stop OR disconnect battery and it shifts into gear but doesnt move...the newest info i hear is this: the eng/tranny are from a "05 express van, savanna...& my ecu is from a 03' !!!!!!!!!!!!! i'm hearin that it wont work...as far as the harness, everything hooks up perfect....but still havin these issues and no 1 seems to know how to fix it......HEEEEEEEELPP PLEASE thx dave

[usmcchevy]

The not turning off is going to be a wiring issue. The trans control could be wiring or in the computer tune. Who did your harness and computer?

[1sik7t2]

fuel injection specialties in texas it's an o3" ecu i'm told they changed it in 04' so it won't work on my o5'.......i havent a clue....vats removed,,has to be reflashed, wheel size is wrong as is the gears....

[Clyde65]

it is all different since your engine came from a van, I think the vans were the same up to 06, so 99-05 was DBC I believe. VATS does need removed and then it should run, the tire size is for the PCM to be able to talk nice to the trans and the other way too. how much are they charging you if ya dont mind be asking?

[1sik7t2]

so you agree that my o3' pcm won't work with my 05' eng/tranny? the pcm was sold to me by a guy here on this forum who WAS my friend...i think he knew it wouldnt work because he disappeared soon after he sold it to me....so sounds like i need a oem pcm, then have it flashed to my specs, as long as it's a 05' 6.0/4l80e trans?

Originally Posted by Clyde65

it is all different since your engine came from a van, I think the vans were the same up to 06, so 99-05 was DBC I believe. VATS does need removed and then it should run, the tire size is for the PCM to be able to talk nice to the trans and the other way too. how much are they charging you if ya dont mind be asking?

[usmcchevy]

Originally Posted by 1sik7t2

so you agree that my o3' pcm won't work with my 05' eng/tranny? the pcm was sold to me by a guy here on this forum who WAS my friend...i think he knew it wouldnt work because he disappeared soon after he sold it to me....so sounds like i need a oem pcm, then have it flashed to my specs, as long as it's a 05' 6.0/4l80e trans?

It will work. The only problem substituting a 03 pcm with a 05 PCM is Drive by wire (DBW) which 05+ have. The vans seem to be a little behind on everything and didnt get DBW until 06.

[1sik7t2]

ok so what does that mean, or what does it do? & how 2 make it work...thx again

Originally Posted by usmcchevy

It will work. The only problem substituting a 03 pcm with a 05 PCM is Drive by wire (DBW) which 05+ have. The vans seem to be a little behind on everything and didnt get DBW until 06.

[usmcchevy]

As long as your throttle uses a cable, you're good and it will work fine.

I would start by calling the people that did your harness and tell them whats going on. In order for your engine to stay running a relay has to be wired wrong. Then worry about the trans issue.

[Shon]

Wiring harness needs to be reviewed and all the hook ups to that harness.
You can make a DBW wire PCM into a DBC but you have to change somethings on the harness; ie it will now need TPS and IAC inputs.
is this a MAF or SD set up? do you have IAT input? ETC input?

[1sik7t2]

wow shon.....WAY over my pea brained head.....i have no idea what u just said..sorry i have some1 checking it out now HOPE HE'S GOT IT, cause i don't obviously

Originally Posted by Shon

Wiring harness needs to be reviewed and all the hook ups to that harness.
You can make a DBW wire PCM into a DBC but you have to change somethings on the harness; ie it will now need TPS and IAC inputs.
is this a MAF or SD set up? do you have IAT input? ETC input?