1982 Crossfire conversion to carb issues ?
Thread Starter
Heel & Toe
Joined: Sep 2014
Posts: 17
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1982 Crossfire conversion to carb issues ?
Hi ! I have converted a 1982 corvette crossfire to carburetor and have an issue that has me stumped !! The complete crossfire system was worn out so that was the reason for the change. The new set up is a 2101 edelbrock intake manifold and a 4106 carburetor / also new accel hei distributor with vacuum advance. I have eliminated the computer. I wired the fuel pump to the fuel pump relay and the Hei distributor bat terminal to the ignition terminal in the fuse box. The car does not respond to retarding the timing or advancing it. Car will not start but is getting plenty of gas. I also installed a Mallory return style fuel pressure regulator. Is there something I am missing? Relay or sensor that is keeping car from starting ? Maybe a ground ? Any help will be greatly appreciated !! STUMPED !! I wonder if it could have jumped time ? HELP PLEASE !!!
Melting Slicks
Joined: Apr 2009
Posts: 2,632
Likes: 112
From: Great Plains Iowa
Hi ! I have converted a 1982 corvette crossfire to carburetor and have an issue that has me stumped !! The complete crossfire system was worn out so that was the reason for the change. The new set up is a 2101 edelbrock intake manifold and a 4106 carburetor / also new accel hei distributor with vacuum advance. I have eliminated the computer. I wired the fuel pump to the fuel pump relay and the Hei distributor bat terminal to the ignition terminal in the fuse box. The car does not respond to retarding the timing or advancing it. Car will not start but is getting plenty of gas. I also installed a Mallory return style fuel pressure regulator. Is there something I am missing? Relay or sensor that is keeping car from starting ? Maybe a ground ? Any help will be greatly appreciated !! STUMPED !! I wonder if it could have jumped time ? HELP PLEASE !!!
The ECM was used to power the fuel pump relay and by removing the ECM you have made it impossible for the fuel pump relay to work which means the fuel pump can't run. You'll have to use a common electric fuel pump pressure switch to run your fuel pump.
Thread Starter
Heel & Toe
Joined: Sep 2014
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I took the fuel line off at the carburetor and turned the key on and you could hear the pump running and it put a decent supply of gas in the container I had. THANK YOU FOR YOUR INPUT !
Last edited by CE1982VETTE; Aug 5, 2015 at 06:51 AM.
Burning Brakes
Joined: Apr 2008
Posts: 1,222
Likes: 93
From: shelbyville West Michigan
You probably need to completely go through the distributor timing process. #1 tdc, 0 on the timing tab. put distributor in an note where the roter lines up on the cap. that will be your #1 plug wire, start there, 18436572...
I am guessing there is a difference between the two distributors.
that is of course assuming you get spark to begin with.
I am guessing there is a difference between the two distributors.
that is of course assuming you get spark to begin with.
Le Mans Master
Joined: May 2007
Posts: 5,017
Likes: 1,118
From: North tonawanda NY
my guess would also be this ,,, try temporarily running a jumper wire to the hei unit off the alternator and see if its a spark issue from the ECM not being happy... Doesnt the ecm control the transmission in the 82 ? I,m not sure of this but thought it had something to do with the lockup...
Thread Starter
Heel & Toe
Joined: Sep 2014
Posts: 17
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my guess would also be this ,,, try temporarily running a jumper wire to the hei unit off the alternator and see if its a spark issue from the ECM not being happy... Doesnt the ecm control the transmission in the 82 ? I,m not sure of this but thought it had something to do with the lockup...
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Thread Starter
Heel & Toe
Joined: Sep 2014
Posts: 17
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I'm going to make sure the timing is right by bringing #1 cylinder up on the compression stroke and see where the rotor is pointing. The last time I tried to start it seem as though the timing was off because it was turning over slower than normal so I advanced it and the it would turn over faster but acted like it wasn't responding to any adjustment made ?? The is something I am missing and any help would be much appreciated. I do have a question though is the coolant temperature switch in a 1982 controlled by the computer and maybe without the computer the engine will not start ? If this is true then what would be the solution ? THANKS DON !
Melting Slicks
Joined: Jun 2011
Posts: 2,096
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I'm going to make sure the timing is right by bringing #1 cylinder up on the compression stroke and see where the rotor is pointing. The last time I tried to start it seem as though the timing was off because it was turning over slower than normal so I advanced it and the it would turn over faster but acted like it wasn't responding to any adjustment made ?? The is something I am missing and any help would be much appreciated. I do have a question though is the coolant temperature switch in a 1982 controlled by the computer and maybe without the computer the engine will not start ? If this is true then what would be the solution ? THANKS DON !
If you eliminated the ECM the coolant temp sensor would make no difference. Basically you're going back to old school technology, fuel, spark, and compression.
Melting Slicks
Joined: Jun 2011
Posts: 2,096
Likes: 15
Are u still using the original pump in the tank? Because if you are and didn't wire it different then the pump would only turn on for a couple seconds then shut back off because it does not have the signals from the ECM to keep it running..
Thread Starter
Heel & Toe
Joined: Sep 2014
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I wired the hot wire from pump to relay on firewall but I think it should have been wired to the hot wire on the oil pressure sending unit. When I get time and the right mindset I get back to sorting out the problem more thoroughly. It has been hard to concentrate after loosing 2 of my brothers to cancer in the last month. You are correct about the temperature sending unit not being an issue because it is controlled by the non-existent ECM. THANKS TO ALL THOSE TRYING TO HELP ME BECAUSE MY TRAIN OF THOUGHT IS NOT WHERE IT SHOULD BE ! P A T I E N C E !