im about to put in a tpi setup on my 88 iroc but the wiring harness is of a automatic transmission would I have to replace the vss for a manual transmission and if so how? also if you know anything about ecm that would be helpful to

 

your 88 iroc is already tpi and you just want to switch to manual trans.?

 

no I got the base model iroc with tbi with t5 manual trans now I want to put in the tpi setup but don't know if well I do know that I can't use the vss on the transmission because I got it off an automatic but my question is do I have to get another wiring harness and Ecm or what can I do to use what i've got

 

yeah,you will need a new harness if you're going from TBI to TPI.
I don't know what happened to your car but,88 IROCS didn't come with TBI.
If you're going with a speed density tpi,I have an old eng. harness here for $50 but,you'll also need a new ecm and yeah,that auto. vss won't work.

 

Your car has a cable driven speedometer. The VSS feed comes from the back of the speedometer.
More info needed. What year TPI setup/harness are you using and what car is it from?

 

it's from an 88 automatic and yeah I thought IROC only came in TPI but unfortunetly they also came in TBI year 88 with the t5 manual transmission. oh yeah MAF wiring harnes is what I got.

 

If it's a MAF set up you are using, then you are all set. You don't have to do anything with your transmission. You already have the correct mechanical speedo drive on your T5 connected to your speedometer. The VSS is the optical style, on the back of the speedo, and is wired into the connector near where the ECM is mounted.
There is no VSS connection on the transmission for a Camaro before 1990. If you have a VSS connection on the harness for the transmission, then the harness came from a Firebird.

 

well here's the ECM #1227165 that came off with the whole setup wiring harness and tpi setup. another thing I noticed that the wires that get connected to the heater unit are not there.

 

Yup that's a MAF ECM. As for heater wires, they aren't related to the computer harness in any way, you shouldn't have to touch them.
If you don't already, I would highly suggest getting a factory service manual for the 1988 Camaro. It will have all the wiring diagrams you need to allow for rewiring and repinning as needed.

 

well when I took the tbi wiring harness all that was connected to each other so I just pulled everything off

 

yes,there are many subtle differences in so many harnesses from 82-92.
If you can post pics johnny,I can probably help you figure out how to get the hvac wiring re-installed if it doesn't exist on your new harness.
And yes to clarify for you,that ecm#1227165 is correct for a MAF setup.

If the memcal is for an automatic car you'll need to get one for a 5-spd car.

 

ok but I wont be able to post any pic until tomorrow and exactly what do you need pics of? tpi wiring harness? thanks