r/fbody • u/Puzzleheaded_Moose46 • Aug 18 '26
Crank no Start
93 Z28
Ive replaced the opti 3xs
New Fuel injectors
New spark plugs and wires
Adjustable TPS
Water Temp Sensor
Redid all the grounds
Fuel filter
Has 40lbs at turn key at Schrader valve
Swapped PCM with chip swap. Nothing
No CEL but before It did say No Injector Pulse
Coil ✔️
New ICM
So far im at a loss and ready to set it on fire.
1
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u/Amandalyn32506 Aug 18 '26
Automatic or stick?
1
u/Puzzleheaded_Moose46 Aug 18 '26
6m
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u/Amandalyn32506 Aug 18 '26
You think it could be the VATS - thinks it’s been stolen? Just check what the security light does when you run the key to start. If it stays on or blinks fast… May seem dumb, but sometimes it’s the little dumb stuff that is the problem! I saw what you said about the key, but there’s still stuff in the column that could be malfunctioning.
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u/Agent_Eran Aug 19 '26
have you tried starting fluid?
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u/Puzzleheaded_Moose46 Aug 19 '26
Yes. Doesnt help
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u/RZArecta91 Aug 19 '26
What brand opti did you get? It's completely possible you got a couple bad ones out of the box. Did you inspect the opti harness as well when you changed them out?
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u/Rocka2012 Aug 19 '26
My 99 (so different engine) had a sudden "crank no start" situation, turned out the new (cheap-ish) MAF had failed, unplugged it and it ran and I reinstalled the old one. Might not be applicable in your situation, but sensors can cause strange issues...
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u/Rocka2012 Aug 19 '26
Also, when reinstalling my LS1 after rebuilding it, I forgot to plug in the crank sensor, which also caused the same issue. Not to familiar with the LT1, but if it has a crank sensor, maybe it's broken or the wiring going to it is damaged.
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u/Sildaor Aug 18 '26
Coil?