89 ECM question
Thread Starter
Racer
Joined: Sep 2007
Posts: 375
Likes: 18
From: Lawrenceville Georgia
89 ECM question
First let me say I do have a similar thread on the Scan & Tune section. I will try just specific questions on this thread. Will a 89 run properly with the complete ECM from a 86 if all is equal between the two cars? Doing this should make the 89 scan as a 86? Only difference is no cold start injector on 89. Right? Any help will be appreciated. Thanks
Joel
Joel
Pro
Joined: Aug 2000
Posts: 666
Likes: 0
From: Richmond TX
First let me say I do have a similar thread on the Scan & Tune section. I will try just specific questions on this thread. Will a 89 run properly with the complete ECM from a 86 if all is equal between the two cars? Doing this should make the 89 scan as a 86? Only difference is no cold start injector on 89. Right? Any help will be appreciated. Thanks
Joel
Joel
Thread Starter
Racer
Joined: Sep 2007
Posts: 375
Likes: 18
From: Lawrenceville Georgia
Thank you for your reply. Now I need to find a stock PROM for my 89 amd this should help cold starts. Can I push my luck by asking what is $32 versus $6E? I'm trying to educate myself more on the world of ECM's. Again thanks.
Joel
Joel
Burning Brakes
Joined: Apr 2004
Posts: 762
Likes: 2
From: Huntington ma
In reality the cold start - deleted or active - isn't really going to be anything that you notice. The cold start injector only functions for a Very short time - between zero and 8 (I think that's right) seconds, depending on coolant temperature. Doesn't really do anything that matters.
I deleted the 9th injector from my '85 with the install of Edelbrock runners. With NO changes to anything else - PROM program included - it fires up and idles the same as it did before, even now in the winter, and we have seen mornings in the single digits already this season.
Bottom line is that if you are having a hard/slow start problem the Cold start injector isn't the reason.
I deleted the 9th injector from my '85 with the install of Edelbrock runners. With NO changes to anything else - PROM program included - it fires up and idles the same as it did before, even now in the winter, and we have seen mornings in the single digits already this season.
Bottom line is that if you are having a hard/slow start problem the Cold start injector isn't the reason.
Pro
Joined: Aug 2000
Posts: 666
Likes: 0
From: Richmond TX
Cheers,
Michael
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
''instant'' start when the engine cranks over is the WORST thing you can do to your car...far better to have oil pressure/flow to the bearings before load is applied by explosions in the cylinders...unplugged my ninth injector years ago while using tPi, current lt1 conversion intake doesn't have a place for it, i have an 89 chip on the shelf and it will stay there...you may experience slight delay in cold start.
Thread Starter
Racer
Joined: Sep 2007
Posts: 375
Likes: 18
From: Lawrenceville Georgia
Good info. This was my line of thinking, as I still do want the car to read 1989 instead of 1986 when a scan tool is used. I've only checked with one GM dealer in my area for a stock replacement, no luck. they say part is discontinued. Any suggestions for replacement?
Thank you
Joel
Thank you
Joel
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Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
All you need is some "nice " person to burn (load) the correct '89 program onto a chip.
Could also go to a professional like PCMforless and get a chip done with all the desirable extras for same money as stock chip..
Fan on temps lowered , EGR /VATS delete , convertor lockup speed changed etc
Could also go to a professional like PCMforless and get a chip done with all the desirable extras for same money as stock chip..
Fan on temps lowered , EGR /VATS delete , convertor lockup speed changed etc
