BlueIroc-z

iTrader: (4)

I am speaking with regards to '99+ cable throttle PCM's and wiring harnesses. I have a '01 LQ4 that I am swapping into my '89 Camaro and am trying to figure out what my options are, as far as the wiring harness and PCM go.

So, are all '99+ cable throttle truck wiring harnesses compatible with the '99+ cable throttle car PCM's? For example, would an LQ4 engine/trans harness work with a '99 LS1 Corvette PCM? How 'bout a 5.3L truck harness, with the 'Vette PCM?

04600rr

iTrader: (12)

why use the vette PCM? if your going with the 5.3 harness why not use the 5.3 pcm? or is it called an ecu on a gm, well whatever......the 5.3 computer is just as programable as the others to my knowledge.........

bww3588

iTrader: (49)

actully its a PCM om GM vehicles.....

bww3588

iTrader: (49)

to my knowledge all vettes are fly by wire.

99NMB

iTrader: (7)

just get a 99+ fbody wiring harness and be done with it.

04600rr

iTrader: (12)

sorry for the mistake......I wasn't sure

BlueIroc-z

iTrader: (4)

I used the 'Vette PCM in the example, because thats what I have. I'm not necessarily going with a 5.3L harness, I just want to know if I can. I'm asking because at first I was looking for just f-body harnesses, but after a month of looking I havn't found one that is cheap (~$200), not DBW, and for an automatic. Basically, I'm trying to widen my search to include other compatible wiring harnesses. I just don't know what harnesses can go with what PCM's.

Well, that could change everything... And I think you're probably right, at least according to this(DBW mentioned in the last paragraph).

Hmm, so I guess that leads to the question: Can I use this '99 'Vette PCM with any of the newer truck DBW harnesses?

bww3588

iTrader: (49)

possibly, i would assume most of GM's PCM's are comparable, especially in the GEN III family powered vehicles.

BlueIroc-z

iTrader: (4)

Yeah, as would I... I thought I read somewhere, though, that the earlier PCM's with RED/BLUE connectors cant work with later GREEN/BLUE connector type harnesses... Does that sound right?

Another question: Could I flash this '99 Vette PCM to a cable throttle OS and use an F-Body harness? I thought I read somewhere that certain DBW PCM's don't have an IAC driver (which would be needed for a cable throttle setup), but that may have been only for later years... Or I could be totally off base altogether...

Found where I read that... But that is with regard to 1meg PCM's, a '99 Vette PCM is 512kb according to this article... So, I guess my question still stands...

bww3588

iTrader: (49)

honestly, im not a PCM wizard, i studied them in school, but i dont have any tuning software nor have i been in control of one to change things around. i would ask around in the PCM and diagnostics section.

BlueIroc-z

iTrader: (4)

It's cool, thanks for your help. I was leery of throwing this out in the PCM section, thought it might be too nooby of a question.

I sent an e-mail to Speartech with some more specific questions about my situation. I'll post the answers here, it might be of some use to someone down the road.

04600rr

iTrader: (12)

Also the truck harness is shorter then the f-body harness.......so you might have to mount your pcm in the engine bay....just food for thought.......

bww3588

iTrader: (49)

either them or TSP, they do tuning on all Gen III motors in cars and trucks, they would know too.

BlueIroc-z

iTrader: (4)

Thanks for the heads up. At this point, though I just want a nice cheap harness no matter what. But, apparently the words "cheap" and "wiring harness" don't often go together.

Anyways, here's what Speartech had to say: