I thought vats had to be turned off when exchanging computers anyway?

 

i just checked my email ion siad he just programed me a new pcm with my vin and i should have it monday? i dont know i asked him what he thinks has to be done if its vats, but i havent gotten mail back yet.

 

Hey my name is shane I am an ASE master tech with 8 years LT1 experience. I am in the process of opening a new garage on high point road but would be happy to drop by for a beer or 2?

LMK ive been thru many engine swaps and cam head changes in my 96 impala ss. BUT i dont know if the B Body ECM with its stock obd2 calibration would work to even run the car?

 

how exactly is this problem takin care of, if it is the vats, no one has mentioned that yet.

 

ttt, how does one fix and what causes the vats to be set off , it happend as soon as i got my first pc tune.

 

What is done in programming is the PCM is told not to worry about getting the fuel enable signal from the VATS. Therefore, it won't cut the injectors off if it is not there.
At this point, it is speculation that the VATS is the problem.

 

does it sound like it can be tune related? ion told me he's never had this happen before, i dont know, it sucks though, just seems ironic though all the times i could had mailed it and get it back it doesnt work right hmmm

 

Okay so yeah I guess Jesus was playing tricks on me. We took the $6,000 Scan Tool to it today and found that the code P1626 Pass Key Fuel Enabled. This is supposed to run under the disabled setting. However we were unable to change it's status from enabled to disabled with the tool. I disconnected the alarm in the trunk (stock sensor shock thing) didn't think it would make a difference but what the hell, nope no difference. We did have it running for almost 10 seconds. But everytime it was the same problem. We also tried swapping to my spare ignition key, no luck either. So apparently there is a resistor on my key and that completes the circuit that disables the Pass Key for the fuel, to unlock it so to speak. As well as I either can go back through GM and get a new pass key and programming for around $250 due to 2 hours or so of labor. Or I can get a resistor sauderd (sp?) to complete the circuit and not have to worry about the pass key at all. All that sound correct?

So my question is does this come down to a PCM problem or what? Cuz if that is the case I would much rather save the money and get the problem eliminated completely from the equation by fixing the PCM. It's odd that the other guy has the same exact problem that I do from 2 completely different programers. What exactly did you have him fix with your computer? I had the O2 sensors deleted. 2 of them, if you had the same thing I will look up the codes for them. I also had the Evap Purge Solenoid code deleted. Both of which we noticed were completely removed via the scan tool. So everything was done that I needed. But something may have been added or deleted on accident from/to the programming. Let me know what ya'll think from that. I will continue to keep this updated over the next 2-3 days.

 

I have madz28 do the following:

Perfomance heads and cam tuning (premium octane use)
Knock retard desensitizing
Rev limiter set to 6700 rpm
Disable speed limiter
Coolant fans readjusted to 205*F (low speed) and 215*(high)
Disable AIR
Disable EGR
Disable O2's
Disable carbon canister codes
Increase shift firmness
Raised shift points to ~6100 rpm
Idle set at 725/750 rpm for gear/neutral

thats what is on my sheet that came with my first pcm.

 

got a differnt pcm today from ion, and it does the same thing, i dont have any idea, started right up and then it runs fine for a few seconds and just flat out shuts off, even if i give it gas?

 

Does it sound like it can be possible because I had him delete my O2's i havent ran O2's since i got my lt's a few years ago, i burt the end of the passenger side clip so thats why i never did it? and the other guy who started this thread had his o2's deleted as well? Does this sound right?

maybe he could had deleted the "default program" or the backup whatever it is called incase the o2 sensors happen to fail? for running without the o2s.

I think its called "PE" Mode?

 

I would bypass part of the vats system if you are getting a pass key code. Take a multimeter and measure the resistence across you ignition key. Then go to radio shack and find a series of resistors that equal you key measurement. You dont have to solder them together just tie the leads together. Once you get that done, look under your steering column and you will see a connector with orange sleeving on it with two wires. Disconnect the connector and plug the resistors into the connector THAT DOES NOT go back into the steering column and see what happens. If that doesnt work then I think you have a problem with your theft deterent module

I used this schematic form Shoebox's website
vats

 

well im going to look to get a fuel pressure gauge and check what the f.p is and see if that can be a possible cause

 

I sent my PCM back to Bryan of PCM4Less. He is tuning out the P1626D code and disabiling the vats system. That way this will no longer be part of the equation. That code does not throw the ses light, so you may actually want to get your car scanned and see if that code is still in the computer. Bryan said there is no way that the initial cause could be programming related. The whole resistor thing was what I was orginally going to go with but this seemed the cheaper, easier, permanent fix. I also checked the resistance on the key and found that there was none. So I dunno, should have the PCM back on Thursday so I will let you know then what my results were.

 

Programming out the VATs wont disable the vats completely, especially if you are having a lock cylinder problem or a theft deterent module problem. The resistor mod is only useful if you have a bad lock cylinder that isnt reading your key.