LT1 will not run. please help
Thread Starter
Le Mans Master
Joined: Sep 2009
Posts: 6,340
Likes: 1,148
From: Vermilion OH
the issue after i got the engine started ended up being crossed plug wires on the opti. i took the time to replace the plugs and wires on the right side of the engine and the engine started and ran perfectly! i hope to get to the left side of the engine and replace the plugs and wires on that side as well. today was my first real drive in my new 94 and i can tell you its one hell of an AWESOME car!!! what an improvement over my 84! now, if the clutch weren't slipping, i could really feel how well the car accelerates!
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
the issue after i got the engine started ended up being crossed plug wires on the opti. i took the time to replace the plugs and wires on the right side of the engine and the engine started and ran perfectly! i hope to get to the left side of the engine and replace the plugs and wires on that side as well. today was my first real drive in my new 94 and i can tell you its one hell of an AWESOME car!!! what an improvement over my 84! now, if the clutch weren't slipping, i could really feel how well the car accelerates!
Glad you got it running, have fun!
Thread Starter
Le Mans Master
Joined: Sep 2009
Posts: 6,340
Likes: 1,148
From: Vermilion OH
you, you confirmed it. totally my fault as to why the engine wouldn't run. i was stupid enough to look at the painted on numbers on the wires and assume that they were routed correctly.. i know better. i've been working on cars for 14 years, i should have known better. no more labatt blue when working on the Vette, lol
Instructor
Joined: Dec 2011
Posts: 136
Likes: 3
From: pittsburgh pa.
double check your firing order. if you dont have a factory service manual, but still have the old opti, the plug wire numbers are on the side of the cap where the plug wires connect. and if you dont already know ,the drivers side front plug is#1 next is#3 next is #5 and the last is #7. the drivers side of your opti starting at the top is#5 second from top is #3 , third from the top is #7 and bottom is #1. the passenger side of the opti starting at the top is #4 , second from top is #6 , third from the top is #8 and bottom is #2
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Instructor
Joined: Jul 2011
Posts: 128
Likes: 0
From: Vancouver WA
change the spark plug gap, delco optis like a wide gap .050 but aftermarket optis are prefer a smaller gap .035
try that, i had the same problem with my dynacrap opti with a weak spark, shorten the gap and fired right up
try that, i had the same problem with my dynacrap opti with a weak spark, shorten the gap and fired right up
Thread Starter
Le Mans Master
Joined: Sep 2009
Posts: 6,340
Likes: 1,148
From: Vermilion OH
gapped the new plugs to .050. i'm using NGK copper plugs as i have used in my past C4's. so far its runnign well. still need to do the plugs on the left side of the engine.