90 ZR1: Oh crud, did I break it?

[GTOger]

Originally Posted by Paul Workman

You'll want to change oil and filter before venturing out again. I think most of us are following Marc Haibeck's recommendation and using Amsoil AMO 10-40; it has the "right stuff" in it for our flat tappet cams.
P.

I've never used Amsoil in anything. Not because I don't like the product, but for my applications haven't "needed" the product enough to deal with the hassle of working through their MLM network.

However, I now find it can be ordered online, and it's roughly half the price of the comparable Mobil 1 Racing oil (which also contains the cat-busting, tappet-saving zinc additives). Maybe it's worth giving the Amsoil a shot.

Thanks for the tip.

[Hog]

Originally Posted by tf95ZR1

After MANY years following the LT-5, it's AMAZING how many
times the problem is faulty injectors. It seems like this is the
weak link! And being underneath the plenum, the trapped heat must
add to the stress. I wonder if another design would be better?
Hey, how about a carburetor on top of the engine! What a concept!

I also wonder if using a more modern design might be bette? Fuel injectors have come a long way since the early 90's. Even if you had to change connectors, having greater injector reliability would be worth it to some.

peace
Hog

[Paul Workman]

Originally Posted by Hog

I also wonder if using a more modern design might be bette? Fuel injectors have come a long way since the early 90's. Even if you had to change connectors, having greater injector reliability would be worth it to some.

peace
Hog

Well, yeah, technology improves, and has improved; the stainless Accel injectors as an example. But, we're talking about 20 year old injectors with a known problem with alcohol. But, a carburator? Oh, really now! Maybe for a drag or dedicated track car...maybe. But, my wife has a carb'ed Vette, and I can tell ya from a performance point of view, temperature/altitude/humidity/heat soaking/choke settings/gas mileage(!), I never wanna go back to carbs!

Just a major 20-year tune up: Install new injectors, yank the secondaries, re-build the starter, change plugs, wires, and coils and ya should be all set for another 20 years!

P.

[GTOger]

Hi Race Fans.
OK, tonight the wife and I got familiar with the plenum removal technique. It's off. Hooray. But I'm afraid I'm in trouble now.



If you can see from the pic (it's hard to get a good shot), there's water in one of them there holes. How bad is that?

[Hammer]

Originally Posted by GTOger

Hi Race Fans.
OK, tonight the wife and I got familiar with the plenum removal technique. It's off. Hooray. But I'm afraid I'm in trouble now.

If you can see from the pic (it's hard to get a good shot), there's water in one of them there holes. How bad is that?

Can't see at all, but it's fairly common to have some drippage from removing the plenum. I would say if there's standing water, it's a problem. But if it's just water drops in the hole, wipe it out and reassemble. GL

[GTOger]

Hey John
Oh no... this is no droplet collection. It's standing water. Maybe this is a better pic:


So tell me: how screwed am I?

[tomtom72]

Hi Roger, the good part is that the water stayed in the hole and didn't go any where else.....pull that plug and stick a clean rag down to see if any got to the cylinder.

Sorry, I'm behind on this saga so bring me up to speed. You were not running the motor right? You had just done a few crank overs with the plugs out to see if anything shot out...like coolant or in your case gas. Right?

My guess is that after buttoning up after the last plenum pull you tore a gasket...any sign of that on the plenum gasket from that side?

Oh, sorry, use a rag or paper towels to soak up that coolant as much as possible. The I would carefully pull that I/H so I could see the condition of the I/H to head gasket...that may have a tell tale as to where & how the coolant got into that port. Check me on this thought, that is a secondary port, I think? God bless the secondary port T- blades, maybe.


Tom

[XfireZ51]

Originally Posted by GTOger

Hi Race Fans.
OK, tonight the wife and I got familiar with the plenum removal technique. It's off. Hooray. But I'm afraid I'm in trouble now.



If you can see from the pic (it's hard to get a good shot), there's water in one of them there holes. How bad is that?

It's not good especially since there isn't a source of coolant nearby. I can understand 1-3 or 2-4, but 6? Use a turkey baster to pull coolant if that's what it is. Get a coolant system pressure tester and see if you can determine where leak is coming from.

[GTOger]

Hey Tom
Actually, I'm Chris. But Roger works I suppose. Or Clarence or Victor. Or Ted Striker.

Long story short... driving home from Thanksgiving, car started running like something brown and stinky. Appeared to have white smoke. Thought I smelled glycol. Assumed the worst, then started thinking maybe it's just a bad injector. Plugs 3 and 5 are completely fouled. 7 & 8 appeared oily. No water appeared to shoot out when I bumped the ignition with the plugs out, but a bunch of gas did come flying out of 3. Like... a bunch.

This evening we pulled the plenum and found this little swimming pool in one of the IH ports. So here we are.

I'll try and get the IH off tomorrow and see what I can see. I note that even though I tried to be careful with the plenum gaskets, one of them just came to pieces. Guess I'll be hitting up Jerry again for IH to head gaskets.

If the port towards the back of the car is the secondary, then yes, this is secondary #5.

[GTOger]

Originally Posted by XfireZ51

It's not good especially since there isn't a source of coolant nearby. I can understand 1-3 or 2-4, but 6? Use a turkey baster to pull coolant if that's what it is. Get a coolant system pressure tester and see if you can determine where leak is coming from.

It's actually #5, but same difference, I guess. I'll get it cleaned out, alright.