HEY DOES ANYONE KNOW THE PART NUMBER FOR THE 85 5.0 TPI AUTO COMPUTER? IS IT THE SAME AS THE 86? ALSO WILL AN 86 COMPUTER WORK WITH A 85 SETUP? I KNOW THE PROM LOOKS DIFFERENT ONE IS SMALLER, BUT 86 IS MORE COMMON. THANKS FOR ANY INFO.

DAVE

 

442,

The early 1985 TPI used an 8-bit processor ECM, and the very few TPIs released late in the model year used the newer processor and controls. The old P/N is 1226870, and the newer ECM is P/N 1227165, but you need to be very careful to get an ECM designed for a TPI, since the carbed engines also used the 1227165 with different firmware and PROM.

Obviously, the two are not interchangable. The older style had a piggybacked module to interpret the MAF signals and create a burnoff cycle after engine shutdown. The newer ECM lacks this module since the ECM performs this function directly. The MAF sensors are different as well.

The correct ECM for an '86 TPI auto should be Service Part No. 1227165AUM.

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Later,
Vader
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"Fear is how I fall, Confusing what is real..."
Adobe Acrobat Reader

 

For some real details about the changeover, check this link:

http://www.ece.udel.edu/~davis/z28/ecm_swap/

------------------
Later,
Vader
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"Fear is how I fall, Confusing what is real..."
Adobe Acrobat Reader

 

my 86 ta chip has 16035006 8617 what ever thi means

 

The "8617" means the component was produced between April 28 and May 1 of 1986. The "16035006" means you are either not looking at the UV-EPROM or you have a carbed engine.

------------------
Later,
Vader
------------------
"Fear is how I fall, Confusing what is real..."
Adobe Acrobat Reader

 

thanks for the info vader, i noticed that the 85 setup i have has a "mini" ecm as well as the main one, i suppose this is the burnoff unit. also i wasnt sure of my pn. the sticker was ripped off. so id need a computer only from an 85. you said that some carbed cars had the 1226870 ecu and i could just swap the prom? thanks
dave

 

I have a new 870 unit from my Vette that I'd be willing to part with. I bought it a couple of months ago, then decided to do a 7730 upgrade. Drop me a line if you're interested.



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408cid 1985 Corvette
http://www.mojosgarage.com