TBI computer controled distributor on 4.2L? - Pirate4x4.Com : 4x4 and Off-Road Forum
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Old 07-19-2012, 09:14 PM   #1 (permalink)
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Question TBI computer controlled distributor on 4.2L?

Is there a way to get the TBI computer to control the timing on a 4.2L? Do you just need a GM distributor? Why wouldn't the howell kit include something like that?
-Taz, '89 YJ

Last edited by YJ4LIFE; 07-19-2012 at 09:17 PM. Reason: typo
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Old 07-20-2012, 11:54 AM   #2 (permalink)
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The stock distributor can be modified to do this. The mechanical advance springs need to be welded to prevent mechanical advance and the vacuum advance can just be disconnected from the vacuum line. At that point the purple and orange wires on the stock distributor are connected to the correct terminals on the GM 7-pin or 8-pin ignition module.

Your TBI system must first have this capability. Howell, for whatever reason, has just made the choice NOT to allow for computer controlled spark. You'd have to ask them why.

Affordable Fuel Injection's kits do control spark timing.

Last edited by CSP; 07-20-2012 at 11:56 AM.
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Old 08-02-2012, 08:44 AM   #3 (permalink)
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Can the Howell system be retrofit to the OEM style where timing is controlled, or is the wiring/ ECM an issue?
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Old 08-06-2012, 02:43 PM   #4 (permalink)
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You would have to add wiring to the Howell harness and reprogram the ECM to incorporate spark timing. I did it to the Howell kit in my CJ.
75 CJ5, 258, T18a, 4.27's, Warn 8274, Howell EFI
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