new lt1 crank, no start issues.
08-19-2010, 07:33 PM
#1
new lt1 crank, no start issues. okay guys, well i'm still having issues with my car cranking, but will not actually start.
i have 45lbs of fuel pressure, new opti, i'm getting spark from both the coil and the distributor at the plugs, noid lights confirmed that i'm getting absolutely no pulse at the injector harness, and with a multimeter, i'm not even getting a constant 12v at the injector harness w/ key on. opti pigtail is getting the 5v at two of the wires. and i'm getting 12 at the coil/icm harness at several points. Pcmforless tune deleting vats,egr,air, etc. and i'm getting nothing at the injectors. if i provide fuel for the motor through the intake it will start, and run for a few moments until that fuel is burned up. i'm absolutely stumped. the car will crank and crank, but will not actually fire up and run on it's own.
needless to say, help guys.
i have 45lbs of fuel pressure, new opti, i'm getting spark from both the coil and the distributor at the plugs, noid lights confirmed that i'm getting absolutely no pulse at the injector harness, and with a multimeter, i'm not even getting a constant 12v at the injector harness w/ key on. opti pigtail is getting the 5v at two of the wires. and i'm getting 12 at the coil/icm harness at several points. Pcmforless tune deleting vats,egr,air, etc. and i'm getting nothing at the injectors. if i provide fuel for the motor through the intake it will start, and run for a few moments until that fuel is burned up. i'm absolutely stumped. the car will crank and crank, but will not actually fire up and run on it's own.
needless to say, help guys.
08-19-2010, 10:15 PM
#2
Launching!
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Are you testing the injector voltage with just the key on? if so, you need to crank it while testing otherwise, you will get 0 volts. The best way to test is with a noid light that connect to the harness, and a lightbulb with either flash along with the injector pulse if power is present. of no flash or voltage is still detected, then its posible with wiring for that harness is not right somewhere.
08-19-2010, 10:16 PM
#3
Launching!
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oh, if you dont have a noid light, you can use a 194 lightbulb we have in our side markers. you can pull the wires on the lightbulb down, and put one wire on one terminal, and one on the other. it will flash the same as a noid light
Last edited by 98pontiac; 08-19-2010 at 10:17 PM. Reason: incomplete thought.
08-20-2010, 01:34 AM
#4
Are you testing the injector voltage with just the key on? if so, you need to crank it while testing otherwise, you will get 0 volts. The best way to test is with a noid light that connect to the harness, and a lightbulb with either flash along with the injector pulse if power is present. of no flash or voltage is still detected, then its posible with wiring for that harness is not right somewhere.
