Engine prom - Third Generation F-Body Message Boards

Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

Engine prom

Thread Tools Search this Thread
Old 10-12-2017, 05:30 PM   #1
Junior Member
Thread Starter
Join Date: Aug 2016
Posts: 8

Engine prom

I have an 86 Trans Am with a TPI 305 that I am swaping an 89 350 TPI into. The 89 parts car has a VAT system. I know the cars have the same ECM but have to put the 350 prom over to the 86 that doesn't have the VAT system. Is the programing in the prom or computer and how can it get around it to be able to start the engine? No carb answers please I'm keeping the TPI. I've tried looking it up but either ain't asking the right questions or just not finding the answer I'm looking for. Thanks
Misterb is offline   Reply With Quote
Old 10-12-2017, 05:43 PM   #2
Supreme Member
iTrader: (18)
Drew's Avatar
Join Date: Jul 1999
Location: Salina, KS
Posts: 15,008

Re: Engine prom

It's in the chip. It'll look for the VATS signal, and if it's not there, no go. The easiest way around it would be to have a chip burned with VATS disabled. Next easiest, you can buy a module that generates the VATS signal and wire it in, or use the VATS module from your parts car and wire a resistor that matches the key value, to the module so it thinks the right key is connected.
Drew is offline   Reply With Quote
Old 10-12-2017, 06:14 PM   #3
iTrader: (78)
Tuned Performance's Avatar
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 9,439
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt

Re: Engine prom

if you want it programmed out send me a pm, there might be a fan switch change between the two memcals as well if you have ac. Most 89 f body’s are normally open pressure switch while older years are no this causes the fan to come on with the key on unless it’s reprogrammed accordingly on the ac pressure switch is swapped from your donor car.

Last edited by Tuned Performance; 10-12-2017 at 06:20 PM.
Tuned Performance is offline   Reply With Quote

Go Back   Third Generation F-Body Message Boards >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Featured Sponsors
Vendor Directory

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92

All times are GMT -5. The time now is 12:49 PM.

All content copyright 1997 - 2018 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: