Problem getting all 8 injectors working

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HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
735
275
73
57
Memphis TN
This requires taking the upper intake off..(oh just occurred to me the salt and pepper connectors would work for this!)...This same test made sense to me too, test the car wiring and see what's up. It should be stock, my dad bought this car new and its never been messed with.
 
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HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
735
275
73
57
Memphis TN
I think I just figured out what my inj wiring prob is....2 Documents were just posted over at Corral that say the stock Ford ECU is batch EFI not sequential and the injectors are wired bank 1 to to pin 58 and bank 2 to pin 59. There are NOT 8 individual wires from each injector back to the ECU, like many pinouts I've seen say.
 
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HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
735
275
73
57
Memphis TN
AN A9L. That what I thought too but WE're wrong......the connection between the 2 banks is not in my harness so it has to be in the car and this stuff I found explains my problem perfectly. In the cars wiring inj 1-4 are connected on the ground side and 5-8 are connected.....no way they can be sequential.
 
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a91what

SendMeUrDataLog
Mod Dude
Apr 6, 2011
10,426
6,533
214
32
Hillsborough county
Either your car has the wrong harness or someone did a bad repair somewhere. You would only have 2 wires at the ecu for injectors if it was done in the harness.

If it is truly wired batch fire you should have continuity between two sets of four injectors
OR
four sets of two injectors.

I can only be as correct as the information provided to me. You have an 89 with an A9L it should be wired sequential.
I have worked on dozens of these cars and put aftermarket ecus into hundreds of them. This is a you issue
 

HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
735
275
73
57
Memphis TN
I will test the car tomm and prove my theory.
Another doc titled ford_eectch98.pdf posted at Corral by the same guy says this(scroll to bottom and look at pins 58,59):
The table below lists several MCU cabling pinouts. The first is for a Mustang A9L
EEC, used 1989 to 1993 302 MAF, manual transmission applications. The second, for a
1991 Ranger 2.3L Dual Plug EFI Engine (from Mitchell International On-line manual


(c) 1992), was submitted by <[email protected]>. The next three columns
were done by the author and are from the Ford wiring diagrams (yes, I actually
buy the factory manuals) --and they don't use the same naming convention as the
first two.
No Mustang
A9L
'91
Ranger
2.3
'91 4.9,
5.0, 5.8 F-
series w/o
E4OD
'91 4.9,
5.0, 5.8 F-
series w
E4OD
'91 7.3
diesel F-
series w
E4OD
Description
1 Kapwr Kapwr Bty to load Bty to load Bty to load keep-alive power
2 BOO stop lamp sw to
turn sig sw
stop lamp sw
to stop lamp
Brake On/Off switch
3 VSS + VSS + VSS VSS VSS Vehicle speed sensor positive
4 IDM IDM elect sw to
ignition coil
elect sw to
ignition coil
elect sw to
ignition coil
Ignition Diagnostic monitor
6 VSS VSS
VSS
return VSS return VSS return Vehicle speed sensor negative
7 ECT ECT engine coolant engine coolant xmsn oil temp Engine coolant temp sensor
8 FPM FPM fuel sply pump
relay
fuel sply pump
relay
Fuel pump monitor
9 DATA EEC
data EEC
data 10
ACC ACC compressor
clutch feed
compressor
clutch feed
A/C compressor clutch
11 AM 2 thermactor
diverter valve
thermactor
diverter valve
Air management solenoid 2
12 4X4 lo-range
indicator
4X4 lo-range
indicator
14 MAF (CA
only)
15 MAF RTN
(CA only)
16 IGN GND IGN GND dedicated GND to
TFI
dedicated GND
to TFI
Ignition ground
17 STO/MIL STO/MIL check engine
lamp
check engine
lamp
check engine
lamp
Self-test output check Engine
20 CSE GND CSE GND GND GND GND Case ground
21 ISC/BPA ISC/BPA ISC ISC Idle speed control / bypass air

Table 16: ECM CABLE PINOUT


EEC-IV Technical Notes: Hardware 20 last edited: 9/29/98



Eectch98-Part1.fm


No Mustang
A9L
'91
Ranger
2.3
'91 4.9,
5.0, 5.8 F-
series w/o
E4OD
'91 4.9,
5.0, 5.8 F-
series w
E4OD
'91 7.3
diesel F-
series w
E4OD
Description
22 FP FP fuel pump relay fuel pump relay Fuel pump
23 KS KS KS Knock sensor
24 PSPS PSPS PSPS PSPS Power steering pressure switch
25 ACT ACT ACT ACT Air charge temperature
26 VREF VREF pwr to sensors pwr to sensors pwr to sensors Reference voltage
27 EVP HEGO EGR posn feed EGR posn feed EGR valve position sensor
28 NDS EEC data + EEC data +
29 HEGO HEGO EGO EGO Heated exhaust gas oxygen sensor
30 NDS NDS/CES fuel sensor GND fuel sensor GND man'l lever
pos or clutch
Neutral drive switch (automatic)
31 canister purge
solenoid
canister purge
solenoid
32 O/D cancel lamp O/D cancel
lamp
33 EVR EVR EGR valve EGR valve EGR vacuum regulator solenoid
34 DOL
35 EEC to xmsn
36 SPOUT SPOUT SPOUT from TFI SPOUT from TFI tach feed Spark out timing control
37 VPWR VPWR pwr rly to EEC pwr rly to EEC pwr rly to EEC Vehicle power
38 electronic
pressure ctl
electronic
pressure ctl
40 PWR GND PWR GND dedicated GND dedicated GND dedicated GND Power ground
41 xmsn O/D switch xmsn O/D
switch
42 xmsn oil temp
43 ACD A/C demand A/C demand
44 tach retn
45 MAP MAP MAP feed MAP feed MAP feed Manifold absolute pressure
46 SIG RTN SIG RTN sensor sig rtn sensor sig rtn sensor sig rtn Signal return
47 TPS TPS TAPS TAPS TAPS Throttle angle position sensor
48 STI STI EEC to test conn
#1
EEC to test
conn #1
EEC to test
conn #1
Self-test input
49 HEGOG HEGOG fuel sensor GND fuel sensor GND Heated EGO sensor ground
51 AM 1 thermactor dump
valve
thermactor dump
valve
Air management solenoid 1
52 SS xmsn throttle
valve sol #1
xmsn throttle
valve sol #1
53 CCO clutch sw clutch sw Converter Clutch Overide
54 WAC
55 coast clutch
sol
coast clutch
sol
56 PIP PIP PIP from TFI PIP from TFI Profile ignition pickup
57 VPWR VPWR pwr rly to EEC pwr rly to EEC pwr rly to EEC Vehicle power
58 INJ 1 INJ 1 INJ 1 INJ 1 Injector bank 1
59 INJ 2 INJ 2 INJ 2 INJ 2 Injector bank 2
60 PWR/GND PWR/GND dedicated GND dedicated GND dedicated GND Power ground
 

a91what

SendMeUrDataLog
Mod Dude
Apr 6, 2011
10,426
6,533
214
32
Hillsborough county
I will gladly go pull the stock harness out of the storage bin for my 89.
Are you saying none of us have sequential injection?
 
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HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
735
275
73
57
Memphis TN
I'm not saying it, these docs are, and my car seems to agree w the docs. We'll see tomm. When I hook the MS to only pins 58 and 59.