'86 ECM - what's it do? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brad_Olson · 03-21-2005, 08:36 PM

I have an '86 K10 with a carbureted 305 and 4-speed manual transmission. The Q-Jet is the non-computer variety (M4ME) and the HEI has a vacuum advance canister and a 5-pin module. I'm guessing that the 5th pin is somehow tied to the ECM that's located under the dash behind the glovebox; does anyone know exactly what it and the ECM do? I did a minor distributor overhaul over the weekend and after reducing end play the timing's a bit more advanced; would this cause any problems for the ECM? Thanks!

Brad

03-21-2005, 08:36 PM	#1
Brad_Olson Active Member Join Date: Mar 2005 Location: Stoughton, WI Posts: 187	'86 ECM - what's it do? I have an '86 K10 with a carbureted 305 and 4-speed manual transmission. The Q-Jet is the non-computer variety (M4ME) and the HEI has a vacuum advance canister and a 5-pin module. I'm guessing that the 5th pin is somehow tied to the ECM that's located under the dash behind the glovebox; does anyone know exactly what it and the ECM do? I did a minor distributor overhaul over the weekend and after reducing end play the timing's a bit more advanced; would this cause any problems for the ECM? Thanks! Brad



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