24x LT1 swap no spark or injector firing
04-30-2020, 08:31 PM
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24x LT1 swap no spark or injector firing So here is some background.
355 LT1 Vortech Supercharged in a 91 Camaro Z28
Stock crank, rods, forged pistons, stock 4 bolt main block
Stock GM single roller timing chain
Stock 97 Timing cover
Wide 24x crank gear
New AC Delco crank sensor
Air gap .0505 (.7730 deep- .7225 sensor length)
Stock 97 crank pulley
D585 Coils
2 bar map sensor
Harness made by me. Every wire has the correct voltage, good grounds, traced every wire to PCM and verified by Ohms.
Car will crank over fine. Verified with a noid light the injectors never fire
No RPM signal
No spark
I do not have access to an oscilloscope, but I did read on here that no tach signal usually means its not getting a crank signal. I have tried 2 different crank sensors (1 bought from efi connection) and a brand new AC Delco 213-3208 sensor. 24x gear rides in the center of opening and has no movement. I have verified cam sensor wiring but not another sensor. Could it be bad? Fuel pump will prime with key on and VATS has been programmed out of the computer and verified by the tuner a second time.
What else is there to check? Is .0505 too much air gap for the crank sensor? Cam sensor bad? What else could cause no spark or injector firing?
355 LT1 Vortech Supercharged in a 91 Camaro Z28
Stock crank, rods, forged pistons, stock 4 bolt main block
Stock GM single roller timing chain
Stock 97 Timing cover
Wide 24x crank gear
New AC Delco crank sensor
Air gap .0505 (.7730 deep- .7225 sensor length)
Stock 97 crank pulley
D585 Coils
2 bar map sensor
Harness made by me. Every wire has the correct voltage, good grounds, traced every wire to PCM and verified by Ohms.
Car will crank over fine. Verified with a noid light the injectors never fire
No RPM signal
No spark
I do not have access to an oscilloscope, but I did read on here that no tach signal usually means its not getting a crank signal. I have tried 2 different crank sensors (1 bought from efi connection) and a brand new AC Delco 213-3208 sensor. 24x gear rides in the center of opening and has no movement. I have verified cam sensor wiring but not another sensor. Could it be bad? Fuel pump will prime with key on and VATS has been programmed out of the computer and verified by the tuner a second time.
What else is there to check? Is .0505 too much air gap for the crank sensor? Cam sensor bad? What else could cause no spark or injector firing?
Last edited by rickyzZ28; 04-30-2020 at 08:43 PM.
04-30-2020, 10:15 PM
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So 1 more thing to add. When I first wired it up I did have the cam position sensor wired like an LS1 instead of an LS2. Could I have killed the cam sensor?
05-01-2020, 01:19 PM
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That was it! Starts and runs now but is setting a P0342 so need to look into that. I didn't realize they needed swapped. I thought only the cam sensor did. Thanks!
05-01-2020, 02:37 PM
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Just finished an engine swap and I went to start the vehicle it would turn over but not fire up. Grabbed my code reader and I got a code for the crank position sensor. Replaced the one in the rebuilt engine for the one I pulled out and problem solved.