ls1 Not starting??????

[carfreak07]

ok guys I installed the ls1 into the 4.8's place, everything was used and an ls6 cam was installed. The starter will not crank with the key but using a screwdriver it will fire up and die... i have started it several times and have not seen the oil pressure rise yet and sounds very noisy, is this where the lifters and such have not pumped up yet? Would security be an issue with the starting, the security light in the truck is on at all times. I have never owned one of these trucks nor seen this one before the install so is this normal??

There was also a cadillac dash installed, would this be causing any trouble?

Any and all help is greatly appreciated

Thanks alot
Jarrod

[Tim Z]

did you have the VATS unprogrammed or are you using the donor steering column and body module? also you might want to disable the ignition so you can prime the engine with oil.

[motoxlifer]

What do you mean by "everything was used"? Yeah it sounds like the VATS hasn't been disabled. I wouldn't keep starting it until you get VATS disabled because yes all that noise is most likely your lifters not pumping up.

[RedHeartbeat]

Be sure it's full of oil. 5.5 qts in the LS1 f-body pan. Drain it and refill after measuring if you must. Sometimes a wrong dipstick gets put in the tube when at a salvage yard. Did you keep the fbody oil pan? If so, you must use an fbody dipstick and tube. The oil pressure being low will not stop it from running. I don't even have oil pressure feedback going to the PCM in my setup and I get no codes and it runs and drives just like it did when I did have it wired in.

[carfreak07]

<div class='quotetop'>QUOTE(Tim Z &#064; Mar 6 2006, 05&#58;50 PM) [snapback]46235[/snapback]</div>

did you have the VATS unprogrammed or are you using the donor steering column and body module? also you might want to disable the ignition so you can prime the engine with oil.
[/b]

everything is original in truck besides the block and heads.....the 4.8 oil pan was used and I was told this would work and read correctly....I am not familiar with the vats system at all, is this something I must do? And how do i disable it? I have a single blue wire located right under the pcm that is not connected and I have yet to find where it goes, is this something I need to find first? And how do i go about priming the engine with oil pressure? I installed an ls1 in my camaro but had no trouble of this nature...once again thanks for everyones help

[RedHeartbeat]

Okay, more info needed. Are you still using the 2000 truck PCM or the LS1 PCM?

[carfreak07]

<div class='quotetop'>QUOTE(RedHeartbeat &#064; Mar 6 2006, 08&#58;19 PM) [snapback]46255[/snapback]</div>

Okay, more info needed. Are you still using the 2000 truck PCM or the LS1 PCM?
[/b]

I am using the truck pcm....once it is roadworthy then I am gonna take it to my tune man and Have it tuned....he said it would run with this tune but would idle really low and want to die

[RedHeartbeat]

The VATS should not be an issue with the PCM. Depending upon how long the engine set not running, the injectors may be not spraying properly. Are you using the truck injectors or the LS1s?

[Tim Z]

too many unknowns here, please tell us exactly what you did, how did you wire it? how did you plumb the fuel lines, computer you said was stock?, im sure it needs to be programmed for the LS1 right of the bat. but im not sure how the security feature will work since your using the 4.8 pcm.

[carfreak07]

<div class='quotetop'>QUOTE(RedHeartbeat &#064; Mar 6 2006, 09&#58;04 PM) [snapback]46264[/snapback]</div>

The VATS should not be an issue with the PCM. Depending upon how long the engine set not running, the injectors may be not spraying properly. Are you using the truck injectors or the LS1s?
[/b]

truck injectors....it has been setting for bout a year and a half..... I think the ignition may have been changed, if i can figure out how to disable the vats system then I can gewt the new key reprogrammed hopefully....my tune guy said the vats system is only letting it run for three seconds.



It is all completely wired as the 4.8 in the truck was...nothing is any different, all the same, tune will be set when truck is able to be driven.