Computer info needed please
Thread Starter
Advanced
Joined: Jun 2011
Posts: 69
Likes: 0
Computer info needed please
Gents , I want to order a new ecm for my 89 Z51 and have a few questions. 1 is teh computer hard to replace ? 2 is there a code on the computer ? when I looked on line it seems to show 3 different ones . Mine is a 89z51 , 6 speed .. Thanks for any help.
Team Owner
Joined: Sep 2003
Posts: 25,330
Likes: 2,722
GM 16198259 would be the number I would be looking for if I were trying to get one from a dealers shelf. It's not the most recent but that number I believe would have still have met OE quality standards.
Last edited by WVZR-1; Oct 17, 2013 at 01:38 PM.
Thread Starter
Advanced
Joined: Jun 2011
Posts: 69
Likes: 0
Thanks Bro. I was looking at Rock Auto for a replacement .. They have AC Delco's . I'm wanting to change the ECM an d a couple of sensors .. When the car Is at full Temp. Its wanting to run really bad/ not start / stall etc .. Is the ECM hard to get to or remove?? Thanks for the help ..
Pro
Joined: Jun 2007
Posts: 626
Likes: 2
From: Coquitlam British Columbia
I recently changed my ECM on my 1990 and as said above; give the supplier the p/n on the old ECM to order. According to my GM dealership its gone thru a few p/n changes but its readily available. NOTE.... keep the cover ....clips and nuts from your old one when you return the core as they are all remanufactured and those items are not supplied. Had the misfortune of the replacement going bad after a few days but used the warranty to get another one and all is well. The sticker says remanufactured in the USA so just be aware.
bill
bill
Team Owner
Joined: Jan 2003
Posts: 20,254
Likes: 221
From: Summerland B.C. Canada
Thanks Bro. I was looking at Rock Auto for a replacement .. They have AC Delco's . I'm wanting to change the ECM an d a couple of sensors .. When the car Is at full Temp. Its wanting to run really bad/ not start / stall etc .. Is the ECM hard to get to or remove?? Thanks for the help ..
Have you checked for stored codes in ECM ?
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 12
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
9 times out of 10 device failure that reports incorrect information to the ecm is the cause. A bad injector that goes short to ground can overheat the injector driver, or many other issues. As the others have said I would start with injectors.
Should you remove the ecm, make sure to pull the cover, and push on the 2 tabs and pop out the memcal and save it. I've known guys that turn the ecm in for a core forgetting to remove the memcal and then have to buy that too.
Should you remove the ecm, make sure to pull the cover, and push on the 2 tabs and pop out the memcal and save it. I've known guys that turn the ecm in for a core forgetting to remove the memcal and then have to buy that too.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
7 Bolt-On Upgrades From Extreme Online Store to Level Up Your C6 Corvette
Pouria Savadkouei
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I doubt your ECM is bad. They are very robust and can take a lot of abuse.
If for some reason you decide to replace it or send it out for rebuilding, make REALLY REALLY sure you take the MEMCAL out before sending it off. It has the calibration that is customized to your car. That includes the year of your car, the transmission type and rear end ratio. You take off a cover with two 1/4" screws to access it. It looks like this:
If for some reason you decide to replace it or send it out for rebuilding, make REALLY REALLY sure you take the MEMCAL out before sending it off. It has the calibration that is customized to your car. That includes the year of your car, the transmission type and rear end ratio. You take off a cover with two 1/4" screws to access it. It looks like this:
Thread Starter
Advanced
Joined: Jun 2011
Posts: 69
Likes: 0
thanks for the info guys, I'm a pretty good mechanic except its been a long time since I've turned any wrenches. and the electronics are my weak area..
I did a scan on the car and got a code 41 then did a DTC (whatever that means) and got codes 41,42,43, 46,51,54 then did a live data and got codes 24 & 25. Oh so where to start ? I wish there was a place close by here in TN that could give a 1 day class and get me up to speed on this stuff. anyway Thanks for any help.. I really dont have any funds to just throw at the issue and play guess work.. any advise is greatly appreciated
I did a scan on the car and got a code 41 then did a DTC (whatever that means) and got codes 41,42,43, 46,51,54 then did a live data and got codes 24 & 25. Oh so where to start ? I wish there was a place close by here in TN that could give a 1 day class and get me up to speed on this stuff. anyway Thanks for any help.. I really dont have any funds to just throw at the issue and play guess work.. any advise is greatly appreciated
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
This post will get you started:
http://forums.corvetteforum.com/1576116036-post35.html
This site might be helpful (though it is specific to 1986 -- MAF, not MAP):
http://home.earthlink.net/~cliff_har...onditions.html
http://forums.corvetteforum.com/1576116036-post35.html
This site might be helpful (though it is specific to 1986 -- MAF, not MAP):
http://home.earthlink.net/~cliff_har...onditions.html
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
Last time someone came to the board and pulled as many codes as you claim it was the ecm, or memcal. Honestly, I can't remember which. Yours will look similar to the picture of the 1227730 6 cylinder ecm and memcal Cliff posted, but not exact. Your may be a 1227165, but I thought by 89 they had updated to the 16198259 which is an update version. Good luck on your diagnosis.
Thread Starter
Advanced
Joined: Jun 2011
Posts: 69
Likes: 0
Thanks for the help. Is the ECM hard to remove .? Location? Thanks I'm going to get with a contact from another vette site and see what he has as far as ECM's. but at the same time I think I'll change the injectors , the engine only has 40k miles but the injectors are old and not make for ethanol, it might be wise to change them .? thanks for all the help
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
You take off the passenger side kick panel (several 7mm screws). The ECM then slips out after removing two 10mm bolts. It's in a plastic bracket attached to the firewall. It's easy to spot by the tan/yellow color. It's kinda far up under there and you will have to push some wiring harnesses aside to get to it.
It's the metal box on the floor in this pic:
It's the metal box on the floor in this pic:
Last edited by Cliff Harris; Oct 20, 2013 at 12:05 AM. Reason: Added picture.
Thread Starter
Advanced
Joined: Jun 2011
Posts: 69
Likes: 0
Thanks Cliff ..... I've built a few automatic trans. and would rather pull apart a 700R then to have the dash taken apart like in the picture . I'd never get it all back together correctly or without squeaks and rattles.. I have a corvette brother helping me out with a computer . Thanks again, and Bless you my child as you put the dash back together 