In looking for a used replacement LM, I keep seeing different part numbers for 1986 LM's. I'm confused as to what will interchange with what. My factory unit is 5227253.
In looking for a used replacement LM, I keep seeing different part numbers for 1986 LM's. I'm confused as to what will interchange with what. My factory unit is 5227253.
Differences primarily would be auto vs manual transaxle, turbo vs TBI, then it gets into the calibrations for emission certification. I should still have a 1986 Turbo LM from a Chrysler Laser (same as Daytona).
My NYr is an auto, turbo car. I have checked for continuity from the LM plug to the PM plug anti-dwell wire and it's ok. I have tried 2 different PMs with no change and that's why I'm leaning towards the LM. I'm thinking that it's causing the ASD to shut down my spark. Really don't have the cash right now for a reman unit. Shortly before the car started shutting itself down, it started getting crappy gas mileage. Not sure if one has to do with the other or not.
86 will only work for 86. 85 and 87 will not.
Turbo logic modules have red and blue wire harness connectors. The biggest difference between auto and manual is idle speed. Auto has a lower idle speed.
Here's a list of turbo computers:
http://www.turbo-mopar.com/forums/kn...cu_listing.pdf
aj, Can a 1985 T-1 LM be socketed and and serve the same function as an 87 T-2 LM
The only substitute for cubic inches is cubic dollars, how fast can you afford to go?
There's some pretty significant trace routing differences in the corner of the PCB where the EPROM chips sit. The '87 TII uses one 128k EPROM and a timer IC instead of 2 64k EPROMs. I started to design a daughter board to convert the former to the later, but without a source for the timer IC it's completely pointless.
Highly unlikely as a t-2 requires a stepper motor control for the AIS, this stepper motor is used on T2 and 88+ T1. the T-1 87 and older uses a regular DC motor on a log intake.
The stepper motor AIS requires an H bridge driver that is only on T-2 ready LM ECU. It has been noted that some later 86+ T-1 LM has the necessary H bridge drivers. As a note my 87 T-1 Sundance (manufactured July 87) does have the T-2 ready LM.
The EPROM chips are also very different 27c64 vs 27C128.
Also the distributor of the 85 is very different, IIRC.
Last edited by chromguy; 03-27-2020 at 04:22 PM.
Regards,
Miles
DD '87 Sundance T1, SLH with rear disks
'87 CSX #432 2.5 CB TII, SLH
Thanks Miles and Turbo SOB, I would be interested in an 87 T2 lm if someone has a good spare.
Jeff
The only substitute for cubic inches is cubic dollars, how fast can you afford to go?
Miles, my LM must have been made recently enough and it does run the ais motor. My intake is from an 89 as is the ais.
The only substitute for cubic inches is cubic dollars, how fast can you afford to go?
Let me check on what it will fit in, I think a small flat rate box should work. As for the LM, figure $50, I have no use for it as I am now using an SBEC.
In my experience, any 87 LM will run 87 TII systems.
Thanks Miles and Turbo SOB, I would be interested in an 87 T2 lm if someone has a good spare.
Jeff
^^ There are multiple ways but this is the best way and def. get it socketed.
Don't forget the 1 exception, 1987 Shelby Charger is actually still a 1986 LM.
Thanks
Randy
There is no logical reason to call an Engine a motor.
Randy Hicks
86 GLHS60
86 GLHS 373 : SOLD, but never forgotten
89 Turbo Minivan
83 Turbo Rampage : SOLD
Edmonton,Alberta,Canada
Great! Thank you 85lebaront2. I have seen LMs on Ebay, but I have been leery of buying one. There are some sketchy people selling there. I much prefer buying from a fellow turbo Mopar enthusiast.