new ZR1 owner with a few questions.

[DScott600]

I don't mind making my own vacuum lines. Where is a good place to get the lines and fittings and such. Is there a thread anywhere showing how to do it?

[Kevin]

the the air duct will collapse if you have the stock one, you need to reinforce it somehow. Since it seems the inexpensive ones are no longer made a coffee can cut down the side with the bottom taken out inserted inside the duct will work

[tomtom72]

Not to be a cheap s.o.b. but my pump was corroded & I took it apart & cleaned it up & now it works just fine. Check the plug for it & if it has melted plastic then the insides of the pump are corroded from moisture and it's a bit seized up. A little contact cleaner & some patience on the electrical connector should put it right. Same thing with the inside parts...just the moisture over time and if you clean it up, it should work just fine.

I'll post up the p/n of the truck pump when I get to my tool box & look at my inventory sheet.

Have the injectors been done? May want to think this thru slowly about all the "wear" items that are antique under there: actuators, tank, control solenoid, CCVB gasket, CCVB hoses, temp sensors (ECM & Gauge), coils....etc, well you get the idea, right, I could go on and it can get expensive in a hurry. If you want p/n's on this stuff let me know as I think I have most of them.

Good luck with your new toy & welcome to the BOB!

Tom

[DScott600]

Thanks for the tip, I did plan on taking the pump off when I get the car back at the end of this week. I teach electrical and electronics so if it is just seized up from corrosion and such I wont have a problem taking it apart and cleaning it up, but I would like to have the part number for the new one just in case. It would be appreciated if I could get a list of part numbers for all the vacuum stuff under the plenum too.

[Hammer]

GM Part #94669091.
Your local dealer can get one, or you can get it from P & G Chevy. Don't wait 'cause the price is going up slowly. This part was an exact fit on my '91, nothing to change or modify.

[DScott600]

I have all receipts of the work done to the car so it doesn't look like the injectors have ever been replaced. While I have it all apart I'll be sure and address the air duct too.

[flyin ryan]

Originally Posted by DScott600

I'll be sure and address the air duct too.

check the duct while running the car, before it all comes apart, until you get too carried away. when it's warm/hot is it soft or firm, sounds dirty , i personally believe the duct collapsing is a little bit of an urban myth thing. i mean ya sure it's possible if the engine temp. gets way up there, 250° F or so & the paper air cleaner is plugged. with a clean/semi-clean K&N well...

[DScott600]

I remember the duct collapsing was a problem on C5 cars if you were running boost. But if it doesn't restrict airflow and is easy to do I guess it wouldn't hurt to give it some support. Imports do the coffee can exhaust haha

[flyin ryan]

Originally Posted by DScott600

Imports do the coffee can exhaust haha

i don't give them that much credit, fart cans , totally stock cars with a fart can, uh...ya, whatever. has to be ssooo big it lights off sparks going down the road because it's 17X's too big for the car , how'd i end up on this , oh well i'm done

Originally Posted by DScott600

I have recently purchased a white 1991 ZR1 with 70,000 miles. The car is great, just needs a little paint work on the front bumper and some maintenance items taken care of. I usually don't post because I find everything I need to know form searching. I never had to ask anything about my 03 Z06. I have access to all the tools I need and a lift. I'm also pretty good at working on cars. I plan on removing the plenum and and replacing plug wires, coil packs, spark plugs and injectors while I have it off. I will be using the Bosch injectors from FIC. I will also change the PCV, thermostat, oil, brake fluid, transmission and rear end fluid just for peace of mind. My question is I have a small vacuum leak that needs addressing. What parts would I need to replace while I'm under the plenum to after I find the leak? Would the standard vacuum hose rebuild kit from white racing address most of the area under the plenum and if not what else would I need and where would you get it? Also at appears the secondary vacuum pump is bad, I will remove it and see if it is a simple problem but if it needs replacing I read there is a GMC truck that uses the same pump, just different connector. Where would I get that from?

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