No Injector Pulse?

[MrQuick]

Since everything goes through the opti spark I'd look to that. How did it install? any forcing or mis alignment issues? What is your TPS reading at cranking?

If you can borrow a set of niod lights to test injector pulse as a test light could cause damage to electronic parts and connections. Also the ground is real fast and a light might not catch it.



here's an excellent LT1 reference site. http://shbox.com/1/how_tos.html
vince

[Rhino]

Also the ground is real fast and a light might not catch it.

x2. When helping a friend with an EFI swap we thought we had injector issues as well. A standard test light wouldn't even flicker. The injector is only open milliseconds at a time.
a noid is the only way to go.

In a pinch, you could probably use an LED wired in the proper polarity. Most LED's light up at 1.2v, which the injector connector can easily supply. It wouldn't totally light up, but you should at least see a flicker.

[megaladon6]

did you have the VATS system disabled?
what does the LT use for cam or crank signal? did you check those?

[barno68]

x2. When helping a friend with an EFI swap we thought we had injector issues as well. A standard test light wouldn't even flicker. The injector is only open milliseconds at a time.
a noid is the only way to go.

In a pinch, you could probably use an LED wired in the proper polarity. Most LED's light up at 1.2v, which the injector connector can easily supply. It wouldn't totally light up, but you should at least see a flicker.

Thanks for the noid light suggestion, the injector signal is present. So one more thing to check off on the "why the engine will not start" list! Thanks for the help all.

[79PonchoUK]

Thanks for the noid light suggestion, the injector signal is present. So one more thing to check off on the "why the engine will not start" list! Thanks for the help all.

Still listen for the injectors though...if you can't hear them then they aren't working. Even if some signal is present.

It's not unheard of for injector drivers to go weak, it's very unlikely...but I've had it happen. for the sake of 20 seconds minutes listening....

[megaladon6]

double check your ignition timing also.

[barno68]

double check your ignition timing also.

That is what I am avoiding- it is an LT1, so the only issue with timing would be the timing chain placement. I am pretty sure it is correct as I spent a fair amount of time trying to get the dots to line up when installing it. The last thing I really want to do is drain the coolant again and pull the front of the engine again.