DFI and ECM Discuss all aspects of DFI (Digital Fuel Injection), ECMs (Electronic Control Module), scanners, and diagnostic equipment. Fine tune your Third Gen computer system for top performance.

L98 ECU

Old 04-23-2016 | 05:57 PM
  #1  
budofbama31313's Avatar
Thread Starter
Member
 
Joined: Oct 2006
Posts: 140
Likes: 0
From: Phenix City, AL
Car: 91Z, 97RS, 99Z, 02Z
Engine: TPI 383 Vortec, 3800, LS1, LS1
Transmission: T56, 700R4, T56, 4L60E
Axle/Gears: 3.73, 3.43, 3.42, ?.??
L98 ECU

I have a question for the board In reference the the ECU for an 87 GTA with the L98 in it. I found the above mentioned car in a junkyard recently and of course the motor was gone but when I saw L98 on the service parts identification sticker I immediately looked to see if the ECU was still there and it was. I pulled it out from under the passenger side of the dash to find it only had two connectors versus the ECU in my 91Z (with the L98) that has three. Also, they plugged into the wrong side. It plugged in on the end instead of on the side like mine. Isn't the one I found for a 305 and not a 350? Or since 87 was the first year of the L98, did they do something different?
Old 04-23-2016 | 07:24 PM
  #2  
daferris's Avatar
Member
iTrader: (8)
 
Joined: Aug 2008
Posts: 405
Likes: 34
From: Lansing, Mi
Car: One owner '88 IROC 50k
Engine: L98 with bolt ons.
Transmission: T56
Axle/Gears: 3:42 again
Re: L98 ECU

[QUOTE=budofbama31313;6031539]I have a question for the boar
It's the correct '165 ecu mass air flow sensor they are not compatible with the '730 speed density manifold air pressure (MAP) ecu's.
Forgot to mention '85-88 are the '165 ecm's and '90-92 are the'730's

Yes the only difference between ECU's for the 305 vs 350's is the memcal.

Can't tell you what else the '730's were installed in but lots different GM so for example if you find one in a TBI truck and it has a '730 ECU it also will work same ECU would just need to change the memcal... Or consider if budget allow rbob' EBL system it replaces the Memcal in the '730 and let's you tune without burning chips. Just pit one in my car about double the price of a aftermarket chip but way better and allows you to tune and data log as well as giving you a great scan tool

Last edited by daferris; 04-24-2016 at 07:32 AM. Reason: Update
Old 04-23-2016 | 11:19 PM
  #3  
wgripp's Avatar
Supreme Member
iTrader: (1)
 
Joined: Apr 2005
Posts: 1,165
Likes: 1
From: Valdosta, GA
Car: 1991 Trans Am GTA
Engine: L98(5.7 L TPI)
Transmission: 700r4(A4)
Axle/Gears: G80 RPO, 3:23s, Auburn Racer's Diff
Re: L98 ECU

If I'm not mistaken, 305 TPI ECUs are identical to 350 TPI ECUs of the same year with the exception of the EPROM programming.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
MantyZ28
Interior Parts for Sale
51
07-24-2018 07:47 AM
MantyZ28
Exterior Parts for Sale
19
05-06-2016 11:57 PM
MantyZ28
Engine/Drivetrain/Suspension Parts for Sale
7
04-11-2016 12:04 AM
89irocz355
Exterior Parts for Sale
8
04-04-2016 12:05 PM
89irocz355
Interior Parts for Sale
3
03-27-2016 09:52 AM


Thread Tools
Search this Thread
Quick Reply: L98 ECU



All times are GMT -5. The time now is 06:12 PM.