LT1 issue

[Mike Pearson]

If it got a big enough gulp of water down the intake it could have hydraulic damage in the lower end. I would do some serious checking before running it again. Bent rod or damaged piston would be possible. Engines do not like water in the combustion chamber. Hope its minor. Leak check and compression check would be first. Look for differential between cylinders.

[John Nechiporchik]

Mike, That is my concern. I'm going to run a compression check today. I did one last month so I have good baseline data.

[John Nechiporchik]

Compression check results:
1,3,7,2,4,8 all same at 200psi.
5,6 both at 180psi.

Interestingly on same journal.

When tested last month, all 8 were same at 200psi.
Looking at valve train next and will run leak down tonight . Need to borrow the tools.

[Rob Petrie E395]

IF it got that big of a dose of water. It might also have gotten some in the optispark. They are famous for problems when the water pump starts going bad and weeps antifreeze. I imagine a large dose all at once would cause similar opti problems.

[John Nechiporchik]

Rob, Interesting comment.
As I was looking at the area where the water could go, it became apparent that the one connector receptacle, located around 11:00o'clock facing the engine is wide open and not utilized as this set-up is configured. Looking down into the receptacle with a flashlight exposes the 3 terminal prongs. I'm certain that this area was the recipient of a good bath during this process.
As indicated in the previous posts, I'll continue down the path Mike suggested and complete the leakdown test .
Hopefully I get good results.
If I chase the optispark unit, does it need to come apart to "DRY OUT" or will time cure the problem???

Thanks
John

[Dan Fahey]

Originally Posted by John Nechiporchik

Rob, Interesting comment.
As I was looking at the area where the water could go, it became apparent that the one connector receptacle, located around 11:00o'clock facing the engine is wide open and not utilized as this set-up is configured. Looking down into the receptacle with a flashlight exposes the 3 terminal prongs. I'm certain that this area was the recipient of a good bath during this process.
As indicated in the previous posts, I'll continue down the path Mike suggested and complete the leakdown test .
Hopefully I get good results.
If I chase the optispark unit, does it need to come apart to "DRY OUT" or will time cure the problem???

Thanks
John

Have a lot of experience with Opti's.
Water got in mine it created a small almost undetectable carbon track.
PMed it with a new Cap and Rotor worked fine.

Had a few Opti's fail.
Tried 3 Summit versions because of price.
All three failed in 6 months. It was the Trigger.

Twice my GM brand new units failed after 6 months.
Discovered carbon tracking the other a cracked rotor with carbon tracking.

Always keep a rebuilt Unit and a Rebuild Kit.

Never know when the water pump will spring a leak.

D

[John Nechiporchik]

This car has a crank trigger....I believe that is why there is no harness connected to the receptacle for the optic sensor module.
However, The opening where the harness would connect is a direct path to allow water into the dist.cap/rotor area. I looked in ther with a flashlight and thwere was definitely moisture on the sensor terminals. Put a Q-tip in there and definitely came out wet.
If leak down does not show anything, tomorrow I remove cap/rotor.