1990 C4 ZR1 Plenum Removal- Part 1-Vacuum leak!
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- čas přidán 28. 10. 2021
- Part 1-Removing the plenum on my 1990 Zr1 to trace a vacuum leak.
Removed the plenum and began to test vacuum on the car.
This is not a 'how to' video. This is documentary series on what I've done to troubleshoot and restore my ZR1 - Zábava
The engine access in car is incredible.
Coming from someone who is too intimidated to do a plenum pull by himself, this was fun to watch 👍. Nice job.
Well let’s see if I can put it all back together..:)
Wish I had watched this before starting my own plenum pull 😂 I'll be referring back to this to help remember every single oil and coolant line connection. Great video!
Did this on a 90 ZR-1 As well, installed everything back, all vacuum lines were hooked back up. The car gets power to the cluster but it doesn’t make a click or crank when hitting the ignition.
very good overview. I'm doing this over the winter.
It’s interesting every ‘90 I’ve seen has the secondary vacuum actuators installed wrong from the factory; yours are too. The rod should be inline with the secondary rod that they connect to. The woman at the factory installed them a 180 out making them work at an angle. They work fine this way, and I never changed mine, because I felt the diaphragm had been “run in” that way, and I was afraid, if I changed them, the diaphragm would fail….just an interesting note many are not aware of.
👍🏻
Haibeck is the LT-5 Wizard.
LT5 God ;-)
Next time just remove the plenum coolant lead hose that you have to disconnect anyway to lift the plenum . I just hook a hose to it and drain 1.5 litres of fluid out by gravity or use a small pump to start the fluid flow . It will actually stop at the right amount that needs to be removed .
That looks like a total nightmare
It is indeed
Wow that’s one complicated system. So many delicate hoses. Now I know why Chevrolet stop making this engine. I can’t imagine the mechanics labor times
Chevy didn't make it. Mercruiser did.
My '91 with 40,000 miles does that same thing with the secondary pump. Cycles on and off like that. So theres a vacuum leak then?
Sounds like you have a leak somewhere in the system. It’s not vacuum, that pump is charging those lines to open the secondary’s. I think it’s “normal” to have it cycle back on after around 15secs. Mine was doing it every few secs.
What part number did you use to replace the leaky solenoid?
I ordered GM part 214-358 , from Walmart. should be here today or tomorrow. It will need the bracket to be swapped over. First one i ordered from Autozone (EVS450) was not going to work. (it also leaked!). I have been reading that MANY of the new ones leak.
Vs124. I landed on this part and these are the only ones that held and didn’t leak down. I had three of these and used the best one.
Great Job Tackling this LT5!
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