1987 ECU with plastic bracket for sale
01-03-2008, 01:25 PM
#2
Race Director
Member Since: Feb 2002
Location: Compound in the Grove, Ga.
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2020 C3 of the Year Finalist - Unmodified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
St. Jude Donor '16
2020 C3 of the Year Finalist - Unmodified
Ok..... but you may have better luck if you put this in the C4 parts section.
01-03-2008, 07:09 PM
#5
Le Mans Master
87
this 87 part isn't compatible with an 85 because of the computer numbers.
The 85 has an earlier style computer
The 85 has an earlier style computer
01-03-2008, 10:54 PM
#6
Team Owner
01-05-2008, 12:15 AM
#7
Le Mans Master
Ecm
the 85 uses a separate maf burnoff module. repinning isn't all you have to do. also, the 85 alternator won't work with the 87 computer because the alternator voltage is not (electrical) noise free
07-15-2008, 08:18 AM
#9
Safety Car
Anyhow, From Mike Davis:
The ECM conversion/upgrade involves
10 repinning's in the stock '85 ecm harness connector
2 splices's between wires in the '85 ecm harness connector
1 wire removal in the '85 ecm harness connector
1 wire addition in the '85 ecm harness connector
for an '870. All pins/info was taken from:
('85 350TPI Corvette pinout)
http://www.eecis.udel.edu/~davis/z28/ECMs/870ecm.gif
('86 305TPI F-body pinout)
http://www.eecis.udel.edu/~davis/z28...165v8tpi-6.jpg
Old C3 (wire) NEW P4 (connector)
(870) (165)
=============== ================================
Repinning
---------------------------------------------------------------------
A11 (MAT) C12 (MAT)
D2 (Fan Ctrl) C1 (Fan Ctrl)
D8 (EGR Diag) C15 (EGR Diag)
B4 (EST Ctrl) D4 (EST Ctrl)
D13 (TPS Gnd) D2 (TPS/CTS/MAT Gnd) ^*
C9 (Fan Reqst) D11 (A/C Pres. Fan Reqst) %*%
B11 (MAF) B12 (MAF)
D12 (MAT/MAF Analog Gnd) A11 (MAF Analog Gnd) ^*
D15 (Inj 2,4,6,8 "B") (1of2) D16 (Inj 2,4,6,8 "B") ^*
D14 (Inj 1,3,5,7 "A") (1of2) D15 (Inj 1,3,5,7 "B") ^*
Splicing
---------------------------------------------------------------------
C15 splice D15 (Inj 2,4,6,8 "B")(2of2) D16 (Inj 2,4,6,8 "B") (new D16, old D15)
D16 splice D14 (Inj 1,3,5,7 "A")(2of2) D15 (Inj 1,3,5,7 "B") (new D15, old D14)
Maf Burnoff relay - pin A MAS connector pin D
and MAF Pwr relay - pin D
Maf Burnoff relay - pin C B1 (12V and oil sw override)
and MAF Burnoff relay - pin E
and MAF Pwr relay - pin E
MAF Pwr relay - pin A MAS connector pin F
MAF Pwr relay - pin B D3 (Ground)
MAF Pwr relay - pin C B2 (FP signal)
New hookup
----------------------------------------------------------------------
D12 goes to Maf Burnoff relay - pin B
Removal (unused)
----------------------------------------------------------------------
C12 remove
----------------------------------------------------------------------
ECM pinouts are listed on the connector harness and also shown in the
ECM wiring diagrams.
MAS ('85 Burn off module) pin letters should be on the MAS connector harness.
MAF Pwr and Burnoff relay pin letters are on the stock harness connectors
and possibly on some OEM and aftermarket relays.
-----------------------------------------------------------------------
^* NOTE: '85 Ybody (vette) may have these swapped.. Check your app..
(Thanks to Philippe Maier for catching this!)
%*% Depending on what '165 bin file you use, be sure to check that it's
programmed for the correct A/C pressure switch in your application, either normally-open (N/O) or normally-closed (N/C). An incorrect
setting will cause the Rad. Fan to run continuously.
-------
-- Joe
