72 all wired with tbi couple of questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MARKDTN · 04-30-2013, 04:34 PM

Quote:

Originally Posted by BigrobDog

ya i do but was cut off and not sure were to but it back on.trying to find were it went to at end of harness,

Did the OP get his truck running again? Looks to me like he needs a shop manual for the 'Burb and trace down all the wires.

71sixgun · 04-30-2013, 07:40 PM

Did you say that you do not have the wiring connected for the diagnostic port? If so, I would definitely hook it up. Diagnostic port is your best friend for OBD systems. What did the donor vehicle have for emissions, EGR, smog pump, Evap canister, and is all of that in place now? If they aren't and the ECU is still searching for input from them, then its not going to run right; ECU's can be reprogrammed though. TBI's can be finicky, but run nice when they are all correct.

mrolds88 · 04-30-2013, 09:35 PM

OP needs to get the diagnostic port and the check engine light connected. Unit should have a 1227747 computer on it. We just did a swap (87 350 TBI to 80 Chevy 1/2 ton. Went flawlessly. OP said something about a red wire going no where. Might very well be a large part of the problem. Also if there isn't a O2 sensor hooked up, that will be an issue too.

MARKDTN · 05-01-2013, 07:42 AM

Yes, no reason that one shouldn't run nicely.

04-30-2013, 07:40 PM	#2
71sixgun Registered User Join Date: Mar 2013 Location: Clifton, Maine Posts: 86	Re: 72 all wired with tbi couple of questions Did you say that you do not have the wiring connected for the diagnostic port? If so, I would definitely hook it up. Diagnostic port is your best friend for OBD systems. What did the donor vehicle have for emissions, EGR, smog pump, Evap canister, and is all of that in place now? If they aren't and the ECU is still searching for input from them, then its not going to run right; ECU's can be reprogrammed though. TBI's can be finicky, but run nice when they are all correct.

04-30-2013, 09:35 PM	#3
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: 72 all wired with tbi couple of questions OP needs to get the diagnostic port and the check engine light connected. Unit should have a 1227747 computer on it. We just did a swap (87 350 TBI to 80 Chevy 1/2 ton. Went flawlessly. OP said something about a red wire going no where. Might very well be a large part of the problem. Also if there isn't a O2 sensor hooked up, that will be an issue too. __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

05-01-2013, 07:42 AM	#4
MARKDTN Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 2,200	Re: 72 all wired with tbi couple of questions Yes, no reason that one shouldn't run nicely. __________________ '83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project



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