My last effort

[Mitsumark]

As stated in previous threads..Vette Docs..Car was built in 2003..Yes..Car is burning about 1/2 qt in a couple hundred miles according to dipstick and smoke.Injectors are brand new FIC stainless units..Oil/Crankcase has absolutely no smell of fuel at all.However it could be totally thinned out as the car was running all winter in 20dg weather and a ton of warmup/idle time..I may do a Castrol.Syntec 20/50 oil change and see what I get..I doubt that's the answer though..

Gold-Car had 200+ compression in every slug..Still possible rings?

[GOLDCYLON]

Originally Posted by Mitsumark

As stated in previous threads..Vette Docs..Car was built in 2003..Yes..Car is burning about 1/2 qt in a couple hundred miles according to dipstick and smoke.Injectors are brand new FIC stainless units..Oil/Crankcase has absolutely no smell of fuel at all.However it could be totally thinned out as the car was running all winter in 20dg weather and a ton of warmup/idle time..I may do a Castrol.Syntec 20/50 oil change and see what I get..I doubt that's the answer though..

Gold-Car had 200+ compression in every slug..Still possible rings?

Im thinking its the valve seals. how many miles on the motor since rebuild ?

Yep motor needs to come out. easiest way since timing has to be reset etc

[Hog]

Originally Posted by Mitsumark

.Yes..Car is burning about 1/2 qt in a couple hundred miles according to dipstick and smoke.

Is the car still using this much oil?

In regards to oil being contaminated by gasoline, is that with the LT5's very large oil capacity, this effect is muted somewhat moreso than say a standard 5 liter capacity in other vehicles.

To actually wash down cylinder rings with raw fuel the injectors would require a very very rich condition. One almost unattainable except for say an injector that is stuck open, or a cylinder that isnt firing.
Washing down the rings was far more of an issue in the days of the carbeurator.

I'm very pleased that this issues appears to be working itself out. Being stumped with an issue, if very frustrating. And to be honest, makes me apprehensive about ZR-1 ownership.

[cadillac531]

So, I've read this thread from the beginning and I, too, am glad to see this is working it's way out.

I know that OP had mentioned only 2 plugs were wet with oil, but is it possible there is excessive blow by through the PCV system?

I had this issue with my big block Chevelle. It was all 8 plugs, so diagnosis was much easier, but I vented the valve cover to atmosphere and blocked off the back of the carb where the PCV system hooked up. No more oil consumption and the plugs remained dry.

Perhaps venting the crank to atmosphere and blocking off the PCV system would stop the oil consumption...or maybe an oil separator installed in the system would work.

Modified motors can make more crank case pressure than stock ones, especially with increased cubic inches. They can push oil through the PCV system and into the combustion chamber.

Just a thought.

[Blue Flame Restorations]

Could be a simple fix. You never know???? Hope so.

[Z06scentair]

Mark,

Do you happen to know the sizes and backspacing on the TT wheels on your car?

[Mitsumark]

Just replied to you in the for sale section..If you give me a couple days,I could dig up the receipt with the specs..When I bought mine just recently,,the fronts are readily available on EBay..Same exact ones for Trans Am/Camaro..The rears I had custom made from ARE as ZR1 offsets were discontinued long ago and no supplier anywhere had left over stock...They made my rears for $300 each..

[Z06scentair]

Originally Posted by Mitsumark

Just replied to you in the for sale section..If you give me a couple days,I could dig up the receipt with the specs..When I bought mine just recently,,the fronts are readily available on EBay..Same exact ones for Trans Am/Camaro..The rears I had custom made from ARE as ZR1 offsets were discontinued long ago and no supplier anywhere had left over stock...They made my rears for $300 each..

Thank you.

What kind of advice have you gotten from Marc or Arron on the oil consumption?

[edram454]

Im sorry to hear of this terrible problem. If my car had this problem I would be frantic and depressed so lets show some compassion for this man and not ask about his wheels yet. He hasnt sold the car yet and he probably doesnt want too but depending on the engine trouble he might have too. I have nothing to offer as far as knowledge on this one only that by the youtube video it is not normal at all. I would probably take it to Mr. Haibeck or Aaron Scott to check things out. Maybe it is an inexpensive fix?? Good luck my friend.

ed ramos #3028

[Mitsumark]

You should feel something if you rev the engine.
Use the cruise control vacuum actuator just above the battery to rev.

.

If you can see it, notice the throttle cover is removed when I'm manually revving the engine..I removed it for easier access when checking for vac under throttle..I did pull the passenger side cam tube(tube on top of where filter resides)There was no vac there at all..I pulled off all PCV plumbing piece by piece..Can't find any obstructions..Plenum was also just off to remove secondaries..Not a single trace of oil around breather box or anywhere else in the valley..Can't say the same for the plenum..Oil was present but not anything I didn't expect from reading on here..Only my threads make it to page 4 in one day lol...