hi ,I have a 1982 ce vette ,have had it a lot of years, has been off the road for 15 years for repaint and uphosty.lol. when putting it back on the road ,stops running,have repalce all sensors,checked wires everthing!! I need a ecm ,none to be found anywhere. so where can I get the harness adapter for the 7747 ecm?any help would helpful.
thanks wrench man

 

What makes you think your current ECM is dead. Also, have you tried eBay? They turn up there from time to time. Usually cheap too.

 

I still have HAMs available if you really want one and would HIGHLY suggest that you send your 1227747 ECM if you have one to Dynamic EFI for the installation and to upgrade it to the EBL FLASH II if you are going that route and down that path. PM me if you need something. However, since you didn't really explain what is going on in detail, why did you replace all the sensors? I'm assuming that you had a CEL, but what was/were the code(s)? Were any of them a code 55? If you replace the ECM and go to a 7747, are you ready for laptop tuning and what I refer to as going to the Darkside? The learning curve is rather steep and not for the faint of heart. You should be able to find a stock ECM. However, IMO it is a crap shoot if you will get a good one or not. You may end up replacing several before you get a good one. I have seen this type of issue much more times than you would think. If you get a good one first time...BONUS! Good luck and post a much more detailed reply. Thanks.

 

He is not a CFI specialist, but does do them. tbichips.com.

 

Hello buccaneer,
before i took it off the road it was in great shape,ran good.redid the brakes (ss) replaced sensors, cleaned up under the hood
was looking nice.the c ar has (92000) miles. Hand sanded it ,took to painter, got back put new seats , carpet ,and sit in garage for 2 years. Pulled it out in march to finish weatherstriping,was sit idling for about 30 min. And cut off,started back up ran about 15 min.stop agrain.this time would not start.spray fuel but no fire.so i replaced the module in distrubor.no run did alot of checking.unpluged ecm there was corrison on 2 tremals,cleaned pluged back in and nothing, i guess i killed it .got another ecm (reman).a1 cardone the last one they have.would run but so rich would foul plugs and blow black carbon on driveway. Took back parts store. They got a old one some where.was no good at all. Woud not do anything!! Got the a1 back and sent to a rebulter (blue streak) they sent it back 2 weeks later said was un rebuiltable bad board.i have called and look for months.thanking of going to carb. Have spend hours on computor. Do not know where to trun.

 

Well, I'll ask again...Did you originally or do you now have a CEL? You MUST start there. Without knowing what codes are being set and troubleshooting from there is counter productive. You will chase your tail trying to figure out what is wrong. Do you have a GM 82 service manual? If not, get one off of eBay or PM me.

 

In the drivers side storage compartment aft of the battery on the outside wall is a fuse holder. The fuse looks good but gets a little corrosion and nothing in the ecm works right. Take that fuse out and clean it, then check it again. Yes I got towed home because of that fuse. Mine also didn't like a low battery and often would freak out when it got low. Do you still have 12 volts in the battery? If so, take it to your favorite auto parts place and have them check the amps for you. In the other side storage compartment on the front wall of that side box close to the center of the car is a relay that you can just barely see. The fuel relay connector also gets corrosion and makes things difficult. The fuel system won't work right and if the ground in there isn't working you're gonna have lots of other ground issues too. Since the car sat for a couple of years you might have issues causing your ecm to think its bad.

You changed the ignition module. My 82 was very temperamental and ate them often. CLEAN, CLEAN, CLEAN and use lots of the dielectric grease.

My 72 sat for just about half of forever. When we brought it back to life a lot of old brittle wires had become mouse food. Just a little ehat and they failed. Get the manual and wiring diagram and check all the grounds first.

Good luck with it.

Bill

 

I had and still have code 42 and do have a gm service manual. I followed all steps for code 42 in manual all check good .everything looks like a bad ecm just can not find a good one.A1 cardone took theirs back and may be able to fix it MAYBE. I may have to go to carb change over. I like the car stock and have replaced about all sensors new performance prom checked fuse beside battery, new fuel pump when parked. battery is old, will get new if and when can get it to run. lol I need a good ecm so I can go from there. thank everyone so very much for your advise and help !!!

 

OK, since you replaced the PROM, are you absolutely SURE you installed it in correctly and not backwards which is easy to do? If you did install it backwards, even for a second and applied power, it is toast...INSTANTLY. Also, it's more rare, but if you install it backwards, it sometimes will take out the ECM as well, but not often, it's more of a crap shoot on that one.

Well, 42 is a ignition spark issue with the dizzy circuit which if all else checks good, is usually a bad ECM. Are the ECM connectors are OK also? I've never seen the ECM power fuse in the battery box cause an intermittent issue, but I guess it could happen. (GM bright idea about putting electronic equipment in a battery vapor corrosive environment...ECM/ECM power fuse UGH) Usually what happens is, it develops corrosion on the fuse lugs and the resistance builds up enough that it blows the fuse. When the fuse blows, you can still crank the motor, but you will not get fuel since the pump will not turn ON, but you will get spark. Also, big clue the fuse is bad is, you will NOT get a CEL when the key is turned to the ON position, not even for a second. So, if no power is going to the ECM, the CEL will not turn ON. It's odd that you do not have a code 55 though, normally you will with an ECM that is bad, but still has some functions. Good luck on your pursuit of a new (good) ECM. Try Rock Auto.

 

If you just want to get it running and need a ECM that is available you can use a 6026. They are for a 84 Corvette. 776026 is the Cardone number and it is plug and play (no wire or plug changes). You can still find them in stock at advanced auto and at O'reilly. You will still have to buy a PROM for the ECM, Just buy one for the 84 vette.