l99 to 5.7 issues..
Thread Starter
Teching In
Joined: Aug 2016
Posts: 1
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l99 to 5.7 issues.. How's in going everyone? It's been a while since I've had to come to the fourms lol.. So i have a 1994 caprice, it first had the 4.3 l99 in it an I spun a hearing so I purchased another caprice an took the 5.7 along with the tranny an posi an swapped it in. Although havent put the posi in yet only the motor, tranny, an pcm. Wires everything up correctly, even threw new opti, plugs, wires, ECT. -no start- ... Not even trying to crank. I've read that you can start the 5.7 with the l99 pcm so I switched that back thinking maybe vats was kicking in from not changing the keys that went with that specific vehicle. Nothing. Although I do have the steering column an keys to the donor car just havent put it in yet (mine won't turn brights off lol).. I'm stumped. I tried to turn they key on an jump the starter aswell. Only the solenoid engages but dosent engage the starter-(brand new) just makes that winding spinning sound. I'm stumped.. Please helpppp
