GM TBI conversion on a 304 CJ-7

[Texasdave]

Because I cut the wires short to the ALDL I am going to have to add some wire to be able to mount it. What is the preferred method? Soldering and shrink wrap or unpinning from connector and crimping new wire?

[lakedrifter]

hey your in my neck of the woods:)

I'm not at expert at ECMs and programming, but I have worked in wiring a couple years now. When these guys mention re-pinning you usually see it when upgrading to a new style of ECM. They are basically moving the wires around to the corresponding pins for that ECM. Some may re-pin for looks. Some may simply wack and soldier the wires where they need to be. The only time I can see actually having to "re-pin" is if you may some how degrade the quality of the circuit. I know that some wire pairs are twisted and some wires have to be shielded. I'm not sure how I would handle those if I came across one that I needed to cut.

In my case, I'm doing a direct swap. I cut my entire wiring harness from the doner and all my wires are soldiered and shrink wrapped for the ECM.

Heath

[Texasdave]

Okay after some thought and consideration of time and quality I am leaning towards buying a pre-made wiring harness. I was talking with a sales person and he voiced concerns about tuning with a performance cam. Something about trouble with the vacuum values changing and the engine wouldn't idle correctly. Couple of questions: 1) Is this really a problem 2) Can you program the ECM to compensate for this anomaly?

[dave w]

1) Is this really a problem?

Yes, depending on the camshaft. Usually "Computer" friendly cams are a good option. Computer friendly Does Not mean "Stock Chip" friendly!

2) Can you program the ECM to compensate for this anomaly?

Yes, the fuel table (Volumetric Efficiency - VE Table) needs changes based on information from a TunerPro RT data log.

dave w