LT1 Problems NEED HELP
10-20-2018, 05:13 PM
#1
1st Gear
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LT1 Problems NEED HELP
So recently my 89 s10 that I swapped an lt1 into started misfiring during 20+% throttle input, so I read up online and everyone said it was more than likely the Optispark. So I replaced it (it’s the pin drive not spline drive) it slide on with no force so I button it up enough to run, but only half of my cylinders are firing. I figured this out by touch the exhaust manifold pipes. It’s the MSD Optispark cap and rotor kit so I still used the original Billit piece and the internals.
10-20-2018, 05:44 PM
#2
Race Director
MSD optis are known to be not great. When you say you used the original housing, do you mean the OE opti? The optical sensor could be bad, or a dirty/warped disc with the slots on it.
10-21-2018, 11:21 AM
#4
Le Mans Master
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Rick,... Say what!!? Are U implying he should (gasp!) actually,,,CHECK something out first to determine the actual cause, and then verify: (1) it is in fact faulty in the first place, and (2) the replacement is working as advertised? BLASPHEMY!! What kind of CHERRY PICKER are you, anyway!?
10-21-2018, 11:30 AM
#5
Drifting
Rick,... Say what!!? Are U implying he should (gasp!) actually,,,CHECK something out first to determine the actual cause, and then verify: (1) it is in fact faulty in the first place, and (2) the replacement is working as advertised? BLASPHEMY!! What kind of CHERRY PICKER are you, anyway!?
Easy enough to put a gauge on the fuel rail. That, the noid lights and the spark tester are my go-to diagnostic friends.
10-22-2018, 01:45 PM
#6
Melting Slicks
Something doesn't sound right. OP has an LT1 running on 4 cylinders long enough to get the exhaust system hot?
While I agree with troubleshot don't swap, I also believe that when things get worse immediately after a parts swap, revisit that first. Probably see if my wires are on correctly.
While I agree with troubleshot don't swap, I also believe that when things get worse immediately after a parts swap, revisit that first. Probably see if my wires are on correctly.