spare ECM

[JD1964]

I'll be looking at a 1994 Fleetwood LT1 for possible spare parts in the near future. Is the ECU in this car worth getting as a spare? How would it compare to the ECU in the late 1994 Z28 application?

Anything else I should grab? I was thinking maybe the fuel rail if it gives me different options for fuel line connection and routing compared to the Z28 rail.

Anything else?

Thanks

[LeMarky Dissod]

A spare pcm is always a good idea, even if there is no meaningful or functional difference between this 16188051, that 16188051, and any other 16188051.
steveo's OBD1 LT1 .bin file collection probably already has that Fleetwood's .bin file - but just in case, read it out and save it before you use it as your spare pcm.

[In-Tech]

I'm still trying to buy a 94/95 lt1 pcm for bench testing. I forgot about the roadmaster, impala, caprice and fleetwoods having them. Do you guys have a diagram where the pcm is located in the oddball cars. Of course I know where they are in the camaro/firebird but no clue on the rest.

[NomakeWan]

The only difference between LT1 PCMs I am aware of is the physical knock module inserted into it (it’s matched to the car), and that the Corvette ones have some fancy OBDII-related hardware that isn’t actually necessary. So go nuts!

[LeMarky Dissod]

The only difference between LT1 PCMs I am aware of is the physical knock module inserted into it (it’s matched to the car), and that the Corvette ones have some fancy OBD2-related hardware that isn’t actually necessary.
So go nuts!

Whatever the hardware differences between 16181333 (Y-car LT1 pcm) and 16188051 (F- D- B-car LT1 / L99 pcm), none are operationally meaningful or useful to us.

[sherlock9c1]

I'm still trying to buy a 94/95 lt1 pcm for bench testing. I forgot about the roadmaster, impala, caprice and fleetwoods having them. Do you guys have a diagram where the pcm is located in the oddball cars. Of course I know where they are in the camaro/firebird but no clue on the rest.

The B and D body PCMs are located in the front drivers' side corner just beneath the air filter box. Very easy to get to.

[JD1964]

Thanks for confirming. I'll surely make an effort to acquire at least one spare.

I have two Foxbody Mustangs that use A9L and A9P PCM's. They have this condition where the capacitors leak and cause corrosion on the circuit board. I've had both of them repaired and also have a spare.

Do these GM LT1 PCM's have any weak points that are known to fail? If so are they serviceable?

[steveo]

Do these GM LT1 PCM's have any weak points that are known to fail? If so are they serviceable?

they're bulletproof. you almost never see a dead gm ecm from the mid 90s.

i had a dead one once that was due to only one really loose ground being connected and run like that for hours

there was a mexican guy on here not too long ago that had major moisture intrusion issues

i've seen the fan driver die before, only once that i can remember

basically you really have to try to kill it

it used to be possible to brick them during reflashing but with flashhack now i doubt you'll even need a spare

yes they're serviceable but not very well documented