optispark or fuel issues?

kmcminn · Apr 27, 2015

I have had it for 5 years haven't changed it.

B.DRAKE · Apr 27, 2015

kmcminn said:
I have had it for 5 years haven't changed it.

It's prolly still got oil in places that it shouldn't be :flipoff1:

RebelRider · Apr 27, 2015

Re: optispark or fuel issues?

If it's not too hard to get to, pull it off and check it out. I went through 3 in 6 yrs.
I had a waterpump take out 2 and an oil seal fail, taking out the 3rd.

Moisture and/or oil will make its way to the bottom of the opti when it sits. So when you fire it up, it will miss on 1 or more cylinders. As it runs, the vacuum on the opti will pull the oil/moisture out into the intake. That's why it eventually clears up. I never got a misfire code.
This is just from my experience, and might not be your issue. I'd replace it with a GM performance opti. $$$$$$

pholmann · Apr 27, 2015

Just a thought but have you checked the plugs to see if you possibly have a couple oil fouled? Sometimes we overlook the simplest **** first.

kmcminn · Apr 27, 2015

pholmann said:
Just a thought but have you checked the plugs to see if you possibly have a couple oil fouled? Sometimes we overlook the simplest **** first.

Yeah I can get plugs after roll.

kmcminn · Apr 27, 2015

I will buy a cheap optispark. I don't want to spend 400 or 500 on this LT1. No need to keep putting money in something obsolete. That 500 would be a pretty good amount on a used 6.0.

RebelRider · Apr 27, 2015

Re: optispark or fuel issues?

kmcminn said:
I will buy a cheap optispark. I don't want to spend 400 or 500 on this LT1. No need to keep putting money in something obsolete. That 500 would be a pretty good amount on a used 6.0.

I don't blame you. Fwiw, when I saw my LT-1 drive away for the last time I had tears of joy in my eyes.

The-Boss · Apr 27, 2015

I got lucky and my LT1 misfire was just a bad plug at RBD this year.
However a few years back the opti went bad due to the previous owner leaving the vent lines off. Best I can remember it would idle fine but would pop and miss when hard in the throttle. I replaced it with a new GM one that has the vacuum. When installing I completely sealed it with silicon. It has since been completely under water once, normal muddy trail riding and pressure washed the last 3 or 4 years with zero issues. Has been a great junkyard engine and I have a lot of confidence in the sealed GM opti. Just my experience.

kmcminn · May 1, 2015

Well me and Ryan just changed out the optishit. Completely fixed it. The old one was full oil from rollover. There is hose from intake to the optispark(distributor). When the intake filled up with oil it sucked it down into distributor.