new ZR1 owner with a few questions.

[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?

[cuisinartvette]

Sounds like youre going to town on some P.M. and straightening the car out.

Was that the white/red one up for sale recently,mind if we ak what you gave for it?

Enjoy.

[DScott600]

It is the white with grey interior. I am the second owner. It has a borla catback and SLP cold air intake. I have all the maintenance records and there is no indication that any work has been done under the plenum or the serpentine belt has ever been replaced either. I would feel much better if I got all this stuff out of the way. The original owner did some things that make me question his treatment of the car. (passenger window strached due to sheet metal screw sticking out in the door panel when window rubber was replaced, after market CD player installed without dash kit, front spoiler/air dam removed.) I paid 16K for the car. It is at the shop now getting the paint fixed, and I got the window replaced and all of them retinted. Help with the other PM parts is appreciated.

[jonszr1]

sounds like you got a nice deal on her . i would test the vacume lines first before paying the 300 that curt wants for the setup . you my find that it could be a ck valve a actuator , or another single piece , that might solve the problem . i rebuilt my whole system for 50. by doing it myself .if you didnt get a helms/ factory service manual with the car i would invest in one now . it sure makes trouble shooting easier . enjoy your new ride . these are amazing cars . caused me to by 2 . ps headers and upper end porting can put you in the 400 rwhp zone and then these cars get really fun

[jonszr1]

one last thing without the air dam they tend to get hot

[DScott600]

thanks for the info, I was just trying to get an idea about parts, so I wouldn't have to pull the plenum any more then i have to. I already replaced the air dam so hopefully no problems there. But what about the vacuum pump? I know it isn't coming on, hopefully it is just the inline fuse from the battery I read about but if not does someone have the part # of the one from the GM truck that uses the same one? I work at a college and will be using the automotive shop while we are on break so I hoped to get all the parts I need before I started. The only part I'm really worried about is the vacuum lines under the plenum and the pump.

[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.