Crossfire to carb conversions
Thread Starter
Melting Slicks
Joined: Sep 2006
Posts: 3,194
Likes: 27
From: Monroe Twp, NJ
Crossfire to carb conversions
I have been reading about some crossfire owners who converted to using carburetors because of the touchy problems with the crossfire design. My question is what happens to the digital dash and computer issues? Does the ECM still remain in the car? What about codes and electrical issues?
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
What are the "touchy issues" with CFI? 
I believe that the only ECM to dash interface is the fuel economy display....everything else it typical sensors sending signals to the dash.
One ECM interface that won't work anymore is your timing control; you'd need to change the distributor to an early HEI with weights and a vacuum advance....OR, keep the stock ECM in place to control timing, and try to rig a TPS and MAP sensor, while retaining CTS and knock sensors.
I believe that the only ECM to dash interface is the fuel economy display....everything else it typical sensors sending signals to the dash.
One ECM interface that won't work anymore is your timing control; you'd need to change the distributor to an early HEI with weights and a vacuum advance....OR, keep the stock ECM in place to control timing, and try to rig a TPS and MAP sensor, while retaining CTS and knock sensors.
Heel & Toe
Joined: Dec 2016
Posts: 20
Likes: 0
From: Canton New York
I am actually do the same thing, I have done the conversion and I put in a HEI distributor that uses vacuum advance. A couple questions I have is,, where is the ECM located (so I can remove it), what did you all do with the wiring for the throttle bodies? Right now I have just tucked the wires aside, but if they can be removed with out cutting them, that would be nice. One last questions that is not related, I recently noticed my dash is not lighting up when I turn the car on. Does anyone know of any typical issues that cause this? I don't see any blown fuses, wasn't sure if there was a known issues that can cause this. Thanks for any help/advice in advance.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
ECM is under the passenger's side of the dash. Above a passenger's shins.
You can fairly easily remove the entire engine/under hood harness, but then you'd likely be pulling out other systems that you still need. Some sensors, alternator, starting system, come to mind. IDK that you could pull just then EFI part of the harness w/o taking the harness apart and splitting out wires that you need vs wires that you don't.
IDK. Burned out bulbs, but they'd not likely all burn out at once. Bad ground? If you have power, I'd check grounds, then bulbs, I guess.
You can fairly easily remove the entire engine/under hood harness, but then you'd likely be pulling out other systems that you still need. Some sensors, alternator, starting system, come to mind. IDK that you could pull just then EFI part of the harness w/o taking the harness apart and splitting out wires that you need vs wires that you don't.
IDK. Burned out bulbs, but they'd not likely all burn out at once. Bad ground? If you have power, I'd check grounds, then bulbs, I guess.
Burning Brakes
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
[QUOTE=Tom400CFI;1603737875]What are the "touchy issues" with CFI?
I never could get an answer to that either when I had my 84 still remember how you helped me when I had mine hope you know it was appreciated you kept me on the keep it simple stupid plan. I kinda miss it. So easy to work on in reality.
I never could get an answer to that either when I had my 84 still remember how you helped me when I had mine hope you know it was appreciated you kept me on the keep it simple stupid plan. I kinda miss it. So easy to work on in reality.
Safety Car
Joined: May 2001
Posts: 4,759
Likes: 1,647
From: Fairfax Virginia
I would not be able to own a Corvette if it was not for the Factory Service Manuals and my Scanner. If I had to pay someone who really knows the TPI system we have then it would be expensive.
The manuals are not that expensive in hard copy and they are very well written in my opinion. Please don't try and substitute a Clymer or other aftermarket manuals as they are NOWHERE as complete as the FSM is.
The manuals are not that expensive in hard copy and they are very well written in my opinion. Please don't try and substitute a Clymer or other aftermarket manuals as they are NOWHERE as complete as the FSM is.
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