LT1 issue

[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.

[GUMP]

Originally Posted by 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.

If you got water inside of the Optispark plan on replacing the cap and rotor. In the future fill that plug for the optical sensor with silicone.

[John Nechiporchik]

Got a spare cap and rotor. Will replace tomorrow.

[Ed Wright]

Originally Posted by GUMP

If you got water inside of the Optispark plan on replacing the cap and rotor. In the future fill that plug for the optical sensor with silicone.

^^^^^^^^^ There ya go.

[John Nechiporchik]

As they say in the NFL....After further review"....
The valve train all checked out OK
The motor leaked between 5-7% with one outlier at 9.5% (cold)
There was evidence of moisture in the Optispark connector receptacle.

Tomorrow will replace cap/rotor AND plug the connector hole as suggested.
Thanks for a lot of great help.

John