1998 7.4 vortec in a 1961 Ford Body With a chevy blazer Frame.

[Dropped88]

4 plugs

Ok so very late 97 or an actual 98. Cause 96-97 had a 5th plug and those don't have vats. So get vats tuned out and you should be good

 

[someotherguy]

I don't have any of the interior wiring just the firewall bulk head that plugs into the firewall connector

I would look into the wiring diagrams (reminder: linked in these forums, free) and hit your local boneyard in hopes of obtaining the OBD2 diag connector and sufficient wiring pigtail to hook it up. You need it now, and will need it again in the future. I'd do this before spending any other money or effort.

Richard

 

[Pinger]

For absolute confirmation of VATS being the culprit, is it worth (temporarily) hot wiring the pump directly to confirm it (engine) will continue running with that done?

 

[Badfish510]

For absolute confirmation of VATS being the culprit, is it worth (temporarily) hot wiring the pump directly to confirm it (engine) will continue running with that done?

I have the fuel pump running to a switch not from the relay do you think that could he a problem?

 

[Pinger]

I have the fuel pump running to a switch not from the relay do you think that could he a problem?

Directly from a hot source - not via the PCM? If so, you are already bypassing VATS.
(VATS interrupts the switching signal from the PCM to the relay).

 

[Badfish510]

Switched the computer out for a 1996 runs good just gotta finish the exhaust and put the o2 sensors in.

 

[Badfish510]

Got the Old Ford running **** with the 7.4 vortec now. Pretty quick Lil truck. Spins the tires no problem lol

 

[L31MaxExpress]

Directly from a hot source - not via the PCM? If so, you are already bypassing VATS.
(VATS interrupts the switching signal from the PCM to the relay).

I know this is an old post, however VATS also kills the injector pulse.

 

[Badfish510]

Hey I got a long shot question... does any one know what year of chevy and what model these ball joints came off of?

 

[Badfish510]

Hey I got a long shot question... does any one know what year of chevy and what model these ball joints came off of?