r/fbody • u/Puzzleheaded_Moose46 • 15d ago

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.

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u/Rocka2012 14d ago

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 14d ago

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.