Question about 1985 Chevrolet Corvette

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Need to remove ECM out of my 1985 Corvette

I have a 1985 Corvette, I need to remove the ECM to change the Prom out. My Chilton manual says it's in the dash behind the passenger side dash pad. I can't see how that Dash front assembly comes off. I took off the side fuse panel cover and I can see some backets that look like are screwed in from behind that hold in the Dash pad or passenger bumper as it looks. You know it's the section that the A/C Vent is in, the pad protrudes out from the Dash. Can you provde me any help, I really need to remove the ECM. Thanks for any help that you can provide.

Tom

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  • tb7696 Dec 01, 2008

    Hi and thanks for writing back, but Corvettes don't have glove boxes. I got the ECM out it's up in the right side dash. Two screws holds it in place then you just slide the ECM down and it will be right there where the floor mat is. There is enough wiring that you don't have to unplug the wire plugs from the ECM you can replace the Prom Chip without taking it out of the car. Once I figured it all out it took about ten minutes to replace the chip abd reinstall the ECM. One thing though..you have to be a contortionist and stand on your head to do this change out. Thanks for responding.

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Well your in luck i just removed mine today lol. there are 5 1/4 inch screws on the bottom side of the dash on the passenger side of the car remove them pull the plastic cover down and disconnect the light mounted on the piecce you just removed next make sure your battery is disconnected cause it may fry it if power is connected. Next you will need a 10mm look straight up you will see the box it is aluminum with 2 wire harness attached. There is a metal clip holding it attached pull it back and un hook the harness then it will slide right out.

Posted on Sep 06, 2010

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Remove the glove compartment or glove compartment door ( if one peice assembly). They are typically located behind the glovebox.

Posted on Dec 01, 2008

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85 Corvette.....alternator drops voltage and red light comes on after it runs awhile, dash light may start flashing like crazy.

Posted on Dec 31, 2008

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1 Answer

How do u no if your car computer need to be flash


Hook it up to a code reader via OBDII for specifics. Tecnically, there is no reason to flash your ECM unless you are using another ECM from a parts car...for say a 1989 Chevy. This ECM was used on the 1989 S-10 truck with the 2.5L four cylinder, the ’89 Camaro with the 5.0L HO V8 and the ’89 Corvette with the 5.7L Tuned-Port V8 engine. The only difference (aside from the vehicle wiring harness pin population) was the PROM. The PROM contains the calibration software for the ECM. Another reason would be to bypass a security locked ECM like a 2001 Pontiac GT which was notorious for shutting off the fuel pump if the security chip in the key lost connection through switched power.

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OBD-I ECMs were equipped with the Mem-Cal and Cal-Pak to run the base operations. The programming that your ECM uses for normal operations comes from a PROM that you remove and use in the new ECM...unless that is the problem. Its not unusual for a PROM to become loose or just get dirty pins so contacts are poor.

ECM programming didn't come into play until OBD-II allowed in-car during driving program access and modification. People still set their lap-tops in the passenger seat and drive and make changes at stop lites until they get performance they like...
OBD-I folks have to pull the prom, insert new one and hope its what you want. There is equipment to burn your own and write your own performance programs etc...but most guys don;t go that far because its a few hundred bucks worth of stuff thats good for nuthin else and there are too many places that do custom burns based on your input or data logs.

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Where is the ECM located


Hello.

The ECM is mounted on the right side of the dash above where the passengers feet would be.
The lower panel will need to be removed to see it.
Here is the service manual procedure to remove it.
  1. Turn ignition to "OFF".
  2. Disconnect battery ground cable.
  3. Remove right hand hush panel.
  4. Disconnect connectors from the ECM
  5. Remove ECM mounting hardware.
  6. Remove ECM from the passenger compartment.
  7. Remove ECM access cover.
  8. Transfer PROM unit to replacement ECM. Using two fingers, push both retaining clips back away from the PROM. At the same time, grasp it at both ends and lift it up out of the socket. Do not remove the cover of the PROM. Use of unapproved PROM removal methods may cause damage to the PROM or socket.
  9. Remove new ECM from its packaging and check the service number to make sure it is the same as the defective ECM.
  10. Remove access cover.
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There you are. I hope your repair goes well.

KL

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Hi I have a 1985 Corvette and I need to remove the ECM which is in the Dash on the passenger side, how do I get that Dash pad assembly out to get to the ECM. According to my Chilton manual it comes...


I got some help from another source, the ECM is held in place with a bracket with two 10mm screws. When those are removed the ECM slides down and out from under the Dash. The only hard part about all of this is you have to practically stand on your head to see the ECM up inside of the Dash and to remove it, once it's out you can unplug the wiring harness and take it out of the car. I didn't have to remove the ECM from the car to do the Prom change out so the whole job took me about a total of 10 - 15 minutes once I figured out how to go about doing it. Thank you for the help.

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Oct 12, 2008 | 1985 Chevrolet Corvette

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