Re: 8 cams are better than four!
 

not always. I have a vac leak somewhere now and my idle is fine

Re: 8 cams are better than four!
 

Sorry your having issues, but sometimes happens when a car sits for many years. here is a link to replacing it.

http://zr1.net/forum/showthread.php?t=14475

Re: 8 cams are better than four!
 

Got the window regulator out. Looking it over its clear water got in there at some point. I'm going to bite the bullet and order a new one rather than try to just replace the motor. At this point wife's eyes are just rolling. :)

Also had time to pull the air horn and get ready to pull the belt. Headed out of town now so the car will have to wait until Sunday.

Re: 8 cams are better than four!
 

And fwiw while I was listening to the pulleys and determining that it was indeed the water pump, the idle was perfect. Go figure. This was with the accordion removed but the air horn still in place.

Re: 8 cams are better than four!
 

Mark,

Check the numbers on the prom, the 90's had a change to fix idle issues. Marc's site lists them.

" The performance calibration AYBKG is based on GM's latest release of the calibration for '90 LT5 engines. GM calibration AYBK was released as a service part via Product Service Bulletin 476503, dated February, 1994. It was released to address problems with idle fluctuation after a hot restart, increase in idle speed after a hot restart and excessive engine speed during coast down to a stop with the clutch disengaged."

http://zr1specialist.com/HAT%20Web/p...librations.pdf

Re: 8 cams are better than four!
 

Great info and considering how this car sat for so long, I'll bet its original. Come to think of it, the engine was warm when the idle was so high. This afternoon was a cold start and the idle was perfect. Maybe I'll buy more from Marc than I planned...

Re: 8 cams are better than four!
 

When my evap purge line vac source had popped off the plenum, it would idle at 900 rpm cold, but creep up to 1400 or ?? whatever when it warmed up. These cars do tend to run on with a high idle until the car almost reaches a stop, but parked, it should be able to idle at 700 rpm.

I would still do the stiff binder book in front of the air horn to see if the engine stalls out or not. You will hear he leak if it can still manage 600 rpm with the intake blocked

Re: 8 cams are better than four!
 

What are your symptoms? Have you ruled anything out?

Mine is killing me right now here - idling fine too, and I MIGHT have a vac leak, but can't figure it just yet here... It starts the 'lope' just ABOVE idle... (in the Hesitation diags thread, that GC changed for me there)

Sorry to boost your thread here 4cam...

Re: 8 cams are better than four!
 

Re: 8 cams are better than four!
 

Take that window motor apart and see if you can clean the magnito and the magnets, hookit up to a battery and see if it works.

Sometimes they get water in them I have fixed some in the past without replacing them.

The rust is just enough not to let it turn.

Re: 8 cams are better than four!
 

I probably will see if I can clean up the old one and get it working again, just for the hell of it. But for a car I plan on driving a lot, I felt better about installing a new one. One of the motor housing bolts is missing and isn't in the door, which means someone has been in there in the past. Probably for the exact same issue. The housing itself doesn't fit flush any more either.

So Ecklers just got my first order, and I'm calling Marc tomorrow morning for my second - water pump, tensioner and maybe a tune. Too bad he doesn't have a tensioner in stock, so it will take a bit longer to get mine rebuilt. Today's project, determine the prom currently installed, pull the tensioner and the water pump. And since the door panel is off, I'll take a shot at cleaning it to see what it takes.

Re: 8 cams are better than four!
 

Congrats welcome to the Fraternity of ZR1

Re: 8 cams are better than four!
 

jeez I didn't know you had so much euro stuff. and the 68! if that's disturbing, I prefer to be disturbed. nice collection. I really like the 355, very pretty car. just needs a couple of turbos hanging off it to get to 800 or so HP and it would work for me just fine!

Re: 8 cams are better than four!
 

Yesterday work interfered with work. I had to deliver something for a client, thinking it would take a couple hours at most. Eleven hours later and I finally finished, never had a chance to get into the garage. Not my favorite way to spend a Sunday. And to top it off, Ecklers is out of stock on the window regulator, with nothing until late November. I can't wait that long, so I either find one locally or start hacking the motor on the old one. Maybe tonight I'll just sleep in the garage.

Re: 8 cams are better than four!
 

I got plenty of garage time last night, but finally cried uncle around midnight. The serpentine belt and tensioner were out in about 10 minutes and I thought, this is really an easy job. But 2.5 hours to remove 16 bolts and the pump wouldn't budge, making me think it was glued on. Then I finally spied that bastard bolt between the power steering pump and the alternator, hidden under an inch of crud. Getting that one loose was a challenge by itself, and then the water pump fell off like it should. Problem is, it's still attached to the lower hose and no amount of blood, sweat or swearing would get that hose off. It's stuck on there and I simply can't get my hands in there to get any leverage to get it off. I even donated blood, just like you're supposed to. At the end of hour 3 it was closing on midnight and I called it quits for the night.

Any hints/tricks to getting that hose loose? It's ridiculous that a hose has me stopped at this point.

Re: 8 cams are better than four!
 

Take a single edge razer blade and cut hose length wise over coupler. Use flat screw driver to raise edges of cut hose and remove hose. Replace with new hose ;)

Re: 8 cams are better than four!
 

Yeah I was trying to avoid doing that. :rolleyes: But at this point it might be my only option.

Re: 8 cams are better than four!
 

I have a complete set of hoses which are in very good condition. Took them off when I went w Samco. PM if interested.

Re: 8 cams are better than four!
 

After digging so deeply into the front end of the engine, it's pretty apparent that lots of stuff like the tensioner, water pump and hoses are original. So I think I'll be going with new hoses, just for the peace of mind. Thanks for the offer though, appreciate it.

Got lots of bolt cleaning to do too. Some were downright crusty when they came out, and it looks like a couple get into oil passages? The oil that came out smelled burnt too, so an oil change is in the cards.

Let's see, I planned on a water pump and tensioner when I bought it. Now I've got a window regulator, hoses, oil change and misc vacuum connections too. Then I noticed the driver's seat "wings" don't work, climate control seems a bit random, and maybe a couple more small things. Hoping the wife doesn't kill me. I just want to drive! :D

Re: 8 cams are better than four!
 

Hose cut, pump is out and on its way to Marc. Tensioner too, and as luck would have it he's parting out a '91, so I'm getting the window regulator from that. With a little more luck, I'll be on the road by the weekend. I figure I'll solve the idle issue it has now and get everything running properly, 100% stock. Then I'll see about what kind of performance enhancements he's got, and get rid of that damned 1-4 shift.

Re: 8 cams are better than four!
 

At some point in my life I am going to have to buy a little stallion, Maybe my 60th birthday as a midlife crisis vehicle.

Re: 8 cams are better than four!
 

You can just unplug the solenoid on the left side of the trans for now to get rid of the 1-4 lock out, you will still get the light on the dash but no lock out.

Re: 8 cams are better than four!
 

Care package from Marc Haibeck arrived and work commenced. The old gasket came off pretty easily and I cleaned up the surface. Then I started removing all the old hoses including the crossover pipe, and I am very glad I did. Incredible amount of corrosion in the crossover, totally unusable. I think I know what killed the water pump. I'll have to replace it, which means my goal of hitting the road tomorrow is not gonna happen. Also means I probably should flush the whole system a couple times. Does the block have freeze plugs?

Oh and two things. First, whoever decided to use all those pinch clamps should be shot. I'm replacing them all with proper hose clamps. Then that bottom hose to the thermostat is an incredible bitch to remove. Stupid pinch clamp, zero room to get any leverage, and an original hose completely glued in place. It took a combination of cutting the hose, the smallest channel locks I have, and a screwdriver slowly walking the clamp off. Oh and a nice finned cooler to make hash of my hands is a bonus.

So in the interests of getting at least one thing done, I installed the window regulator I got from Marc, worked perfectly. Window adjusted and drivers door back together, felt good. At least now I can roll the car out, wash it and get some decent pics.

Re: 8 cams are better than four!
 

Laugh if you want but getting that lower hose attached to the water pump has got to be one of the most difficult things I've ever done on a car. And I've changed motor mounts on a 928. It took hot water to soften the hose and practically climbing into the engine bay trying to get enough leverage, millimeter by millimeter. Holy hell my arms hurt.

But it's on and tomorrow I should finally button everything back up and bring the beast back to life. My wife is really looking forward to it.

Re: 8 cams are better than four!
 

Good job, wish I were closer and could run by and give ya a hand.

Re: 8 cams are better than four!
 

Thanks so much for the offer! If you're up here on the north side, you're welcome to come by any time, and once I get it back on the road and debugged, I'll be sure to head down your way.

For some reason that hose just kicked my ***. But I'm in the home stretch now, really want to get back in the driver's seat.

Re: 8 cams are better than four!
 

Marc Haibeck seconds your complaint. When he had my engine out for porting last winter we talked about a preventive of replacing all the radiator hoses. He said they were all fine but said he wanted to replace the lower radiator hose anyway because it is such a pain in the butt to get out when the engine is in the car. Which he did. --Bob

Re: 8 cams are better than four!
 

Now that I think about it; I have five GM products with 4 cam 32 valve engines!!!


:cheers:

Re: 8 cams are better than four!
 

HMM, two zr-1's, a caddie,??

Re: 8 cams are better than four!
 

Turbos would make it scream but I'm not that rich haha. Now I need a proper shop for all of it!

Re: 8 cams are better than four!
 

That include the '38?
;)

Nice breakfast, won't need to eat for a week!

Let's see... 86 valves, 13 cams, 4 carbs and one 1000 watt searchlite in cars, lawn mowers, a snowblower and a weedwacker (no cam...) at my house

Re: 8 cams are better than four!
 

One Caddie, one ZR-1, one Kodiak and two Topkicks!

:)

Re: 8 cams are better than four!
 

They're all DOHC?

Re: 8 cams are better than four!
 

Yes!!!:cheers:

Re: 8 cams are better than four!
 

Big John
How many valves you got, counting everything?
How'd that "Mess" work out?

Re: 8 cams are better than four!
 

It's ALIVE!!

Got my ZR-1 back on the ground yesterday afternoon and finally took that first real drive. OMG that engine is addictive. Incredibly smooth and just pulls all the way to the moon! I used Marc's coolant filling procedure and it worked perfectly, no issues at all. The car warmed up nicely, fans operated like they should, and wow does it ever run well.

Thanks to Steve (We Gone) for some last minute advice. When I first tried to start it, lights, camera, nothing. I was sure I had somehow tripped the security system and he had some great suggestions. Turns out I had just killed the battery. :rolleyes: A quick jump from the wife's car and I had a rumbling 4-cam, 32-valve monster in the driveway.

Now that the car is running well and I have a functioning window, cleanup day is finally here. I'll give it a good wash and polish, and post some real pics. And I'll do some more driving.

Re: 8 cams are better than four!
 

Mark, Congrats, Glad you got to tune into WLT5@7200RPMs. :handshak:

Re: 8 cams are better than four!
 

Everything came out fine!!

410 valves!!!

:cheers:

Re: 8 cams are better than four!
 

Finally got out the cleaning supplies and went to town. A good wash and wax and it looks much better, but the paint still needs help. I may go to a pro detailer and have him really bring it back. But in the meantime it looks pretty good. I also took my wife for her first ride in it and she likes it too. Later this afternoon I'll pick up my daughter from her band competition, and she's definitely the "car girl" of the school. Should be fun.

The interior and engine are still dirty but I'll get to those next. The plan is to drive a lot, debug all the little stuff, and slowly bring it back to what it should be.

http://i208.photobucket.com/albums/b...ps2943cfee.jpg
http://i208.photobucket.com/albums/b...psd918df18.jpg
http://i208.photobucket.com/albums/b...ps45698898.jpg
http://i208.photobucket.com/albums/b...ps146035ec.jpg
http://i208.photobucket.com/albums/b...psd001ce5f.jpg
http://i208.photobucket.com/albums/b...ps1748a3a8.jpg

Re: 8 cams are better than four!
 

Lookin good....:dancing