VATS, Fuel Cut off Assistance Needed. Car wont stay running..

[David Borden]

HP Tuners

I need some help. I purchase HP Tuners for the purpose of turning off VATS to get my conversion to run and am having some challenges…

Here are the details:

First try... 2000 PCM from C5 auto trans car. VATS turned off… car fires, but only runs a couple seconds. The car is using the PCM and under hood fuse box from the C5. No BCM.

Purchased HP Tuners Pro to diagnose fix the problem...

PCM now has 2002 C5 program on it with VATS off. A tuner friend updated the PCM with the more current OS and tweaked it for a hybrid install.

I hooked up the newly programmed PCM and fired the car. It ran for about 4 or 5 seconds then died.( a couple seconds longer on the first fire than with the 2000 program) Each time I tried to start the car after that it would run for about 1 second and die.

I probed one of the injector plugs, and get one flash with the test light, then nothing when trying to start.

It appears while VATS is disabled in HP Tuners,(I verified by downloading all and checking it) that the PCM is still activating VATS and cutting fuel to the injectors. I scanned for codes, and nothing appears.

Ive search for hours on this subject, both here and LS1-tech and it appears that this is not an isolated problem. I read numerous posts with people having the exact same problem, or this problem intermittently. This problem has affected a large portion of the GTM builders.

Is it possible for the HP Tuner Guru’s to dig a bit deeper and offer the “disable fuel cutoff” option available for the 2004 GTO, or something to that affect? Anything else you guys can do to help with this? A bunch of folks would be very thankful. I’m trying to make a car show in 2 weeks, and really need to get this car running.

Any assistance would be greatly appreciated.

David

[jimmyblue]

Begin with a fuel pressure gauge on the rail and a
voltmeter across the pump wiring.

You could always just rig the fuel pump relay to
get straight IGN voltage to the coil, and leave the
PCM out of it entirely.

[Bill@HPTuners]

post your file.

-Bill

[David Borden]

will do when I get home tonight.

[David Borden]

Bill, here you go. With this file, it ran for 4-5 seconds, then died. Start attempts afterwards would result in barely 1 second of running.

David

[Chris@HPTuners]

if you are using the vette PCM it could be the column lock disabling fuel, although i'm not sure it should. Anyway here's your file with column lock disabled (this param is not in the editor yet).

Chris...

[David Borden]

Thanks, I'll give it a shot tonight. What procedure should I use to write this file?

David

[Bill@HPTuners]

a write calibration only should work just fine...the vcm suite will let you know beforehand if its not going to

[David Borden]

Chris,

If thats all you changed, it did the trick! Car fired right up and stayed running for about 30-40 seconds and I shut it off. Tried it three times and all were sucessful.

When will this be a changeable parameter in HP tuners? If others want to try the same thing, how can we hook them up to see if it works for them?

Thanks a ton for the help on this, its greatly appreciated!

David

[Chris@HPTuners]

Excellent, its on my to-do list. Most people use Fbody PCMs for conversion and run the cable throttle so you are first we have seen had this issue.

Hopefully it will make it into the next release, until then people can always email me their file.

Chris...

[highoctaine]

HP Tuners,
Details:
C5 manual trans car. VATS turned off… car fires, but only runs a couple seconds.

Purchased HP Tuners Pro to diagnose fix the problem...

File attached
Any Help would be appreciated.

[groundzero]

Chris could you shut off the colum lock also on this 99vette
bin also. WE are have the same fuel pump issue. Thx Ralph

[Chris@HPTuners]

Chris could you shut off the colum lock also on this 99vette
bin also. WE are have the same fuel pump issue. Thx Ralph

email support for the latest beta.