Any reliable corvette shops in the CA bay area?
 

Hi, everyone.

Im new to the group, and as the title suggest, I'm looking for any recommendations on mechanics/shops in the bay area that specialize on the LT5 engine.

A little backstory: I picked up a 1990 ZR1 that ran great to my knowledge, until I got back to the house and noticed that the secondary vacuum pump was continuously turning on and off. I took it to my mechanic and sure enough they found a leak. They used a smoke machine and traced is back to the Secondary Port Throttle shaft seal. Unfortunately, the seal is behind the bearing, which they do not know how to remove and they've chosen not to proceed. They'll be putting everything back together for me to pickup.

This leaves me with a few options:
- I find another mechanic that specializes in the LT5's uniqueness.
- I tackle the job myself and risk turning my running car into a parts car
- Decide to drive her at half power FOREVER (not happening)

Any advice is welcome and greatly appreciated. Thanks!

Re: Any reliable corvette shops in the CA bay area?
 

I would suggest reaching out to Marc Haibeck. It might be in your best interest to ship the car to IL to his shop. I think the place you took it to does not seem to know these cars..

mhaibeckz@gmail.com

http://www.zr1specialist.com/

Re: Any reliable corvette shops in the CA bay area?
 

I second Jeff's suggestion if you can. Vacuum leaks are quite common, often under the plenum, and that is a fix that is certainly possible for you to tackle yourself if you're handy, as many have. Marc has a very good video on how to remove your plenum and there is lots written here about fixing vacuum leaks. This forum is a huge resource for C4 ZR-1s, with lots of experienced members willing to help.

However, as Jeff says, if you have just bought the car the very best thing you could do for it is to ship it to Marc for a thorough going over. Your ZR-1 is, after all, more than 30 years old. I understand of course that may not be in your budget, but if you plan to keep the car a good while and if you can do it financially, I would strongly urge you to do so. I did that when I bought my 19,000 mile '95 in 2012 and it was the best (very reasonably priced) money I could have spent (although I admittedly live fairly close to his shop, so no big shipping charge to deal with). He changed all the fluids, changed the serp belt (hanging on by a couple threads), checked everything and made sure it was running right. He found issues that I would never have even thought to ask about, and even found a hidden car alarm installed, which I had him remove. When I got the car back it was running perfectly and continued to do so for many years. Until of course I sent it back to him for his 510 HP package and then it ran even better! Good luck with your new ZR-1!--Bob

Re: Any reliable corvette shops in the CA bay area?
 

I cannot answer your question re corvette shops in the bay area. But although the port throtte shaft seal leakage is not good, it has nothing to do with the on/off cycle time of the vacuum pump. So you still have a leak in the port throttle vacuum system to resolve.
Graham

Re: Any reliable corvette shops in the CA bay area?
 

Can't agree with the previous posts more, a trip to Marc Haibec's is in your very best interest.
Not cheap or quick, but it is your very BEST option.

As far as I know, there are NO shops in the SF Bay area that have even seen a LT5 much less worked on one.

That being said, if you're handy, have reasonable mechanical skills, tools and somewhere to work your car, here's all you will need to narrow down what you need to fix and give you a thorough understanding of how/what/where the secondary vacuum system does and how it does it.
https://www.corvetteactioncenter.com...nosis-482.html

A plenum pull is a rite of passage for many (if not all) a ZR1 owner.

Do not, and I repeat loudly, DO NOT drop your ZR1 off at the local Chevy shop and expect them to know anything about your car.
They will not.
It's almost a guarantee that they will make whatever problem you're having 10x worse.
Only Chevy master techs were allowed to work on the LT5 when new, and even then the policy was to diagnose whatever the issue was, yank the engine and replace it with a new engine.
No mechanic in any Chevy shop was ever trained to address anything deeper than regular tune up items.
30 years later, anyone that was allowed to work on a LT5 is now long retired.

I'll throw this out there, I'm not all that far away (Folsom, CA) and I could make room in my garage for your car for a few weeks.
I'd be willing to take her in for a little while and see if I can perform some magic for you.
Trouble is, I don't have a ton of spare time (am still working full time, *this close* to retirement but not there yet) and it might take a little while to diagnose and then acquire the necessary parts to effect the repair.
Nothing would happen overnight, expect the entire process to eat up a lot of Spring and maybe into the Summer.

Just so you know, the "BrotherHood of the Beast" is alive and well.

'Crabs

Re: Any reliable corvette shops in the CA bay area?
 

Thank you everyone for the quick feedback!

I was hoping there may have been something locally, but I think you all may have pursuaded me to give Marc a call tomorrow.

After going through what I went through, I would rather have someone who understands the ins and outs of the car taking a look. I also seen that he has quite the catalog of services outside of engine work, so this may be the best route.

While on the subject of shops, does anyone recommend any body shops that can repair a urethane bumper? Upon receipt of my car, one of their employees also ran into a lift which cracked the bumper under the turn signal... They're taking care of the expenses to fix, but I would rather stay away from an aftermarket fiberlass bumper to keep it as original as possible.

- Aaron