North American Turbocoupe Organization



87 vs 88 ECU Differences
rockyrose Offline
Member
#1
I have had some issues with with my '87 5-speed engine not running right, but I seem to have a moving target. I replaced the egr (it needed it anyway), ircm, tps, etc. Shows how poor my diagnostic skills are, I know. But here's the deal: after getting frustrated, I went ahead and plugged a LA3 from an '88 5-speed in to see if maybe my problem traced back to the ecu.

Now I've got different issues, no power from the ircm to the a/c compressor, inconsistent driveability with check engine light coming on and going off, ...

The ECU I took off had all the labeling removed already, so I cannot tell what it is, although it has the following stamped into the plastic housing:
5287
E6DB-14A624-MA
E4LB-14A459-B

Sorry guys, I'm not a mechanic! But how different are the ECU's from '87 to '88, both 5-speeds? What is the correct ECU for a stock '87 TC?
Thanks,
Rocky
1988 Black on sand 5-speed, project
DD:2014 VW Passat Wolfsburg


'The older I get, the better I was!' - unknown
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TurboBoost88 Offline
Member
#2
What kind of issues are you having? ECU's/PCM's do fail, but its not a common problem. I think LA2 Or LA3 are the pcm you want, but im sure someone else will know the exact part number
88 TurboCoupe,Midnight Metallic Blue on Blue cloth, 140 m.p.h. speedo, 96,000 miles, 5spd. Gills valve, many new parts waiting to be installed..88 TC, Silver, 5spd, My first car, wish I still had that one! Built for customers: 67 Ford Fairlane,69 Mach I,70 Mach I Clone,95 Ranger 2.3/5.0 EFI Conversion,99 Cobra Procharger SC-1 Install/Tune,Factory Five Racing Mark III Cobra #4114,1955 Black on Black Thunderbird for local Ford Dealer owner's wife.
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Jeff K Offline
Administrator
#3
LA, LA2, or LA3, but I doubt that is your problem. When these PCMs fail, the cooling fan and fuel pump run continuously with the key in RUN, and it wont output codes.

You say the CEL is on. Have you run the complete (KOEO, CM, and KOER) EEC self test? Since the CEL is not always on, you would be looking mostly for CM codes.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Gman Offline
Member
#4
^^^^^ +1
CM = continuous monitor codes -- the ones that come out after the first batch of "live codes" during the key on, engine off (KOEO) test.

See: EEC IV Tests
1987 TC project car
Red butt splice - boosting about a bar
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rockyrose Offline
Member
#5
Thanks guys,I appreciate the help! I probably shouldn't have bothered you at this time as I go into the hospital tomorrow for surgery and will not be able to pursue this for a coupla-few weeks.

I'll let you know how the hunt goes when I am back at it.

Thanks so much!
1988 Black on sand 5-speed, project
DD:2014 VW Passat Wolfsburg


'The older I get, the better I was!' - unknown
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Not B Anymore Offline
Administrator
#6
Good luck, man. Hope all goes well at the hospital.
Brian Leavitt
'86 TC 5-Speed -- MS2x w/COP | 83 lb. injectors | T3/T4 50 Trim Stage 3 .63AR | Full 3" Exhaust - No Cat | Motorsport FMIC | Ranger Roller | Ported E6 | Walbro 255HP | Kirban | 20psi | 120-amp 3G | 8.8" 3.55 rear | '03 Cobra Wheels
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Pete D Offline
Administrator
#7
Yes, good luck on the surgery.
Pete Dunham


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