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03-13-2013, 08:47 AM
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'69 Chevelle Malibu LSX370, 4L80E, Brembos, hydroboost, 12 bolt, c/os, etc.
You can call me Bart
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03-13-2013, 10:44 AM
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Quote:
Originally Posted by tooblue
I would go back and double check the wiring / routing for all of the circuits that the codes (0351-0740-0753-0758) are pointing to. Where did the harness come from for the conversion?
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thats what im going to do next, trace all the wires back to the pcm and make sure each has continuity. I bought the harness from a local company, SSP wiring I believe the name was. Seems like a really nice harness. Everything is new and well done. Im hoping a pin got pushed out of the connector or something simple.
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Brian Miller
-1972 Nova
-1968 Camaro
-1967 C-10 step side 4x4
-2000 Dodge Dakota
it'll buff out........
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03-13-2013, 11:07 AM
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This may be a stupid question, but does the trans/pcm need an electrical input from the shifter to know what gear its been placed into? I only ask becuase Iam using the factory 1980 camaro shifter setup. There is no PNP switch or anything, just the shifter cable. I just know the 4th gen camaros had an electical switch mounted on the shifter itself and I want to make sure this isnt why Im having this problem.
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Brian Miller
-1972 Nova
-1968 Camaro
-1967 C-10 step side 4x4
-2000 Dodge Dakota
it'll buff out........
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03-13-2013, 09:24 PM
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What year ECM are u using and what is the part# ? What year is the Trans? 4l60, 4l80, 4l70?? Roger
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03-13-2013, 09:32 PM
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Well I figured it out finally, the company I bought the harness from screwed up and put the wires in wrong in the main trans connector. Luckily I had a factory harness to compare to. The wires were put in 180 degrees backwards in the connector. I had to removed them all, turn the connector 180 and reinstall them. Everything seems to work fine now. I haven't gotten into 3rd or 4th gear yet but it seems to be shifting perfectly fine. Now all I have to do is figure this misfire out....
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Brian Miller
-1972 Nova
-1968 Camaro
-1967 C-10 step side 4x4
-2000 Dodge Dakota
it'll buff out........
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03-13-2013, 09:51 PM
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Quote:
Originally Posted by 70TWO NOVA
Well I figured it out finally, the company I bought the harness from screwed up and put the wires in wrong in the main trans connector. Luckily I had a factory harness to compare to. The wires were put in 180 degrees backwards in the connector. I had to removed them all, turn the connector 180 and reinstall them. Everything seems to work fine now. I haven't gotten into 3rd or 4th gear yet but it seems to be shifting perfectly fine. Now all I have to do is figure this misfire out....
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Great news and glad you were able to figure it out. Make sure you post some burn out pics once you get it out
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03-13-2013, 10:25 PM
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Quote:
Originally Posted by 70TWO NOVA
Well I figured it out finally, .
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03-15-2013, 05:04 PM
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So far on the misfire I have; verified good fuel pressure 58-60 psi, checked the plug wires and coil. Swapped the coil/plug wire and the misfire didnt follow the coil. I used a noid light to check the inctor circuits, removed the coil sub-harness and checked all the wires for continuity/resisance, pulled the valve cover and made sure the valves were opening properly, removed the plugs (#7 is clean and shows good continuity and isnt broken internally) I fired up the engine for a few seconds and touched each header and found that cylinder 7 is the only cold one. So far everything I have looked at checks out fine. The only things I havent done is verified good coil driver circuit for cylinder 7 or checked for a physical clog in the injector. Any other ideas??
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Brian Miller
-1972 Nova
-1968 Camaro
-1967 C-10 step side 4x4
-2000 Dodge Dakota
it'll buff out........
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03-16-2013, 07:38 AM
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If the motor sat for any length of time, that injector could be plugged. I could not get my LS1 to start after the swap. I checked everything & nothing was out of order. I couldnt figure it out. I pulled all the injectors and soaked them in sea foam overnight. Put them in & it fired right away. Have you checked that plug- is it wet with fuel? Bad plug possibly? Scott
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69 RS LS3/T56
68 firebird vert LS1/4L60E
67 RS LS2/T56
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03-19-2013, 09:56 AM
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Well I went through the harness wires (power and signals to coil connector) all the connections and wires were good. Just to be sure I pulled the wires out of a GM harness that I had and ran them instead of the wires that came with the harness. Still no change, miss on cylinder 5. I switched the coil out with one I had and it seemed to not be misfiring as bad. Maybe both my coils are bad?? I dont know what the odds of that are but Im out of ideas at this point. I think Im going to check the injectors next. I know they did sit for a while, its possible they got clogged.
__________________
Brian Miller
-1972 Nova
-1968 Camaro
-1967 C-10 step side 4x4
-2000 Dodge Dakota
it'll buff out........
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