jamiesls1

iTrader: (4)

Hello my LS1 starts for about 5 seconds or so then shuts off. Would this be some kind of sensor not plugged in? I have a few connectors not plugged in and I can't find places for them to go. If anyone has a LS1 wiring harness layout diagram that would be awesome. Thank you

poconojoe

iTrader: (43)

Did you have the vats turned off in the PCM?

jamiesls1

iTrader: (4)

I got my PCM mailed to me. I told him it was for a rx7 swap and he said he has done them plenty of times. I didn't mention that to him because I was not aware of it but I don't think he would leave it knowing I have a swap. Then again it would be my fault. I found its a dark blue wire PIN 30 on the red connector... can I ground it out or... what?

G-Body

iTrader: (4)

If its programmed with an f-body tune (IE the computer originally came from an f-body) then you can bypass the VATS by building or buying a VATS bypass box. Theres directions in the FAQ sticky.

If the PCM was flashed as a truck, GTO, or vette tune, then it cannot be bypassed and must be deleted in the PCM.

jamiesls1

iTrader: (4)

I was told it is not the VATS system since it actually starts for a few seconds. I have discovered that my cam sensor is unplugged and have decided that is the problem.
Since I have my engine in the rx7 I have to extend the MAP sensor (first problem) and now I am going to have to extend the cam sensor connector. Since my PCM is under the carpet on the passengers side I have to do this.

G-Body

iTrader: (4)

Who said that? that is the definition of VATS lol. If the vats are still functional it will start and run for 3-5 sec and then shut down. Now on the older TBI/TPI stuff it wouldn`t start with the security on, but not on the LS series.

tonyss96dcm

iTrader: (1)

I had this issue with my swap also. Car would turn on, run for 2-5 seconds, then die out. A local shop deleted the VATS and problem solved.

poconojoe

iTrader: (43)

Who ever told you that, doesn't totally understand the Vats system. There are really two parts to it. The PCM part and the BCM part. In a lot of stock vehicles the PCM does not allow the vehicle to crank over if the Vats is not satified. But since you're using this in a swap, only the PCM part of the Vats comes in to play and this is what allows it to only run for a few seconds. i'm not positive about how the LS operating system handles the missing cam sensor, but a lot of GM's switch to batch fire mode, if it missing and other then the SES light being on, you wouldn't notice the differance.

the_merv

iTrader: (88)

If the Cam Sensor was unplugged the TACH would be not working properly to my knowledge, I've never seen anything about it running wierd.

jamiesls1

iTrader: (4)

Knowledgeable people here. You guys are right I plugged in the cam sensor and still runs for a few seconds then shuts off. Can i delete the vats with a scan tool or do I need to use something else? Or any other method to solve this problem?

the_merv

iTrader: (88)

You can trick the Computer by wiring in a Resistor. To properly get rid of it you will have to change the tune in the PCM.

jamiesls1

iTrader: (4)

How many OHM's? Is it inline, parallel? I know its the dark blue wire on the Red connector. Let me know and I can have my car running

G-Body

iTrader: (4)

The resistor trick only works if your still running the BCM.

Back in a sec

G-Body

iTrader: (4)

You need to build a bypass like this http://temp.corvetteforum.net/c3/70lt1/vats.stml

the_merv

iTrader: (88)

Oh. So basically you can loop the Wiring for it to where the Circuit is always complete?

poconojoe

iTrader: (43)

You need to hook the resister to the BCM, he doesn't have a BCM. He needs to get the Vats tuned out