Help pcm swap - Chevy Impala SS Forum
 
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post #1 of 9 (permalink) Old 01-07-2017, 04:32 PM Thread Starter
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Help pcm swap

QUESTION EVERYONE!

i have a 95 caprice wagon that someone threw in the baby Lt1 about 7-8 years back... not sure IF they replaced IT with a l99 pcm but IT has Been running strong for years.... since i got the 94 Roadmaster wagon(rusty) with about the same milage and the Lt1 runs strong , i was thinkin of swaping the motors . The Lt1 into the caprice and the l99 into the Roadmaster ... i want both cars to work good since i still want to use the Roadmaster for family driving, so My QUESTION is, does the swap go Easy or are there sensors, pcm swaps and headaches or anything in detail i have to think of? ... i would like to just swap in and out on both cars.. both are complete and strong running engines.. i looked at both motors and they seem to both be identical, all feedback appreciated ... there are My wagons
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post #2 of 9 (permalink) Old 01-07-2017, 05:58 PM
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the motors will physically swap into the other wagon.

Maybe someone can confirm, IDK if there is a difference between 94 & 95 PCM other than they are both OBD1. I would think you would want to transfer the L99 PCM with the pcm it has now and the LT1 motor with its PCM also.I just don't know if that is a plug & play transition between the 94 & 95 model years.

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post #3 of 9 (permalink) Old 01-07-2017, 11:17 PM
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You should swap the ECMs with the engines. The LT1 will run with an L99 ECM, and I think vice versa, but they run better with their correct ECMs. Swapping them is the easy part of the engine swap. The L99 trans may not like the LT1, from what I have read.

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post #4 of 9 (permalink) Old 01-08-2017, 12:51 AM Thread Starter
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The trans is a Lt1 trans since the motor was only replaced, and the pcm on the l99 might be the lt1 Box since they didnt know they were swaping in a L99 .... how do i tegel what pcm i have ... so Maybe its the stock pcm Box? My car 95 caprice is originally a Lt1 car
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post #5 of 9 (permalink) Old 01-08-2017, 02:28 AM
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the transmissions use different electronics and pcm programming is different 94 vs. 95
programming is different l99 vs. lt1

if you swap you will need to use the correct programming on the pcms or you will have problems.

programming needs to match both the engine&trans.

you can reflash with usb cable and laptop with EEHack.

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Last edited by babywag; 01-08-2017 at 02:30 AM.
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post #6 of 9 (permalink) Old 01-08-2017, 10:54 AM
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The L99 uses 19 lb injectors and the lt1 uses 24 lb injectors. That is going to be a problem for your car. You can read in the drivetrain section on putting different years of transmissions in different cars. There is a whole thread that discusses what you need to do
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post #7 of 9 (permalink) Old 01-08-2017, 03:05 PM
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Because of where he is, My recommendation is to gain the capability to read-write the PCMs.

Find out what calibrations are actually in each car, then make the required adjustments to each
Being one car is a single fan tow package, putting the other cars PCM in will immediately blow a fan code.
Plus the 94 being a non PWM trans car with the one wire missing
Much easier to just change the 94 Buick calibration to reflect the L99 injectors and cylinder volume and vise versa.
There is also talk of a Caprice calibration affecting the ability to get drive-train data from the Buick HVAC display.

One top of all this he will be able to make other adjustments , or email calibrations to others on this board for help


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post #8 of 9 (permalink) Old 01-08-2017, 03:55 PM
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Quote:
Originally Posted by 95wagon View Post
Because of where he is, My recommendation is to gain the capability to read-write the PCMs.

Find out what calibrations are actually in each car, then make the required adjustments to each
Being one car is a single fan tow package, putting the other cars PCM in will immediately blow a fan code.
Plus the 94 being a non PWM trans car with the one wire missing
Much easier to just change the 94 Buick calibration to reflect the L99 injectors and cylinder volume and vise versa.
There is also talk of a Caprice calibration affecting the ability to get drive-train data from the Buick HVAC display.

One top of all this he will be able to make other adjustments , or email calibrations to others on this board for help
Yep...

Swapping the transmissions AND engines AND pcm(s) creates issues that could be avoided.

Leave the transmissions where they are, leave the pcm(s), just swap engines, adjust .bins where needed and reflash.

If you're dead set on swapping everything?
Swap it all, but you're going to have to do some extra things for each car, or you will have problems.
Read this post...this explains the transmission stuff you will need to do for each car.
4L60E swap guide B-body

'94 Caprice Wagon - Bilstein shocks, Hotchkis rear trailing arms & sway bars, Moog 80098/CC623 springs, AR Torq Thrust II wheels w/ 255/50/17 tires, Bonneville seats, and a LOT of new parts. Some day it'll be done...to do Jegs Catback exhaust & 24x conversion
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post #9 of 9 (permalink) Old 01-08-2017, 08:37 PM
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Quote:
Originally Posted by 95wagon View Post
Because of where he is, My recommendation is to gain the capability to read-write the PCMs......
LOL.....my recommendation would be to leave the cars alone.

IJS.....

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