Vacuum pump? Why does it buzz every 10 seconds? [snappic]

[GOLDCYLON]

Originally Posted by Blue Flame Restorations

Or just remove it and never have to worry about it again

AMEN Brother

[scottfab]

Originally Posted by WVZR-1

You also have a cruise that doesn't work so I wouldn't panic regarding this. From the appearance of some of the install, the fact that they did a "pedal swap" I'm quite sure you'll find solutions in your search. You might check and see if your CHMSL works. They may have not understood the function of the switch that does the vacuum for the cruise and the 12V to the CHMSL!

You might have a few more surprises.

Patience!

This is a very good point. If you have other more pressing issues hit them before the 10sec pump cycling problem. But whatever you do DON'T just rip things out until you've had time to consider the alternatives.
See this ad:
https://www.youtube.com/watch?v=rmx4twCK3_I
There is plenty of time later to rip things out and hang fuzzy dice from the rear view mirror. There is a whole tread/poll on the various things people have ripped out. It's pretty entertaining to read.

[scottfab]

Originally Posted by scottfab and Dynomite
This is not normal. 10sec is too short of an interval. 12-15 seconds is stated in first post.
I see. And the pump is also mentioned, however, if you look at the title of this thread you may see something interesting =D>

It's easy to get it to 30sec or more. Yes....install a complete new system of vacuum lines and connectors.
So the only way to get to 30sec (or much more) is to replace everything? I don't think so.

DON'T rip it all out ! What???.........many of us remove the vacuum system completely (remove, not rip)
Don't confuse the guy. "many of us" is relative. I'd say a half dozen +/- a few have ripped the secondary system out. There are literally thousands of ZR-1 with the secondary systems in place. And guess what? They work.

Just fix it like you would a burned out light bulb. A burned out light bulb 30 feet in the air and no ladder
I agree there are those that would rather throw a rock at the bulb than get a ladder. Or they might even cut the pole down that has the light on it.

You also should not trade the car in for a new one
when the ash tray is full. Or remove the plenum when you have a very very small vacuum leak on a 20 year old car.
We're not even to the point of knowing it's under the plenum. More confusion. A "very very small vacuum" leak is relative. A 10 sec cycle time is not a "very very small vacuum leak". I'd call it a moderate leak to be dealt with. There is absolutely no reason the secondary vacuum system cannot be fixed and fixed to a point where it works for 10yrs before a "very very small leak" appears again. A lot of it has to to with how dusty and dirty the air is in which the car is driven. If you drive your car on dirt roads in dry conditions you're simply going to have more plugged filters and dirty check valves.

Start with the basics.
Find the hard plastic hose that comes out of the pump and
pull it out. Then put you finger over the side coming from the pump.
It should run a bit then stop for an indefinite period of time. Checking for an internal leak in vacuum pump....but even then if it is the vacuum pump back leaking I would not replace vacuum pump for such a small leak.
There is no reason to replace the pump for such a issue as contamination or what's more likely, a leaking diaphragm.
I have a tread on fixing the diaphragm or it maybe attached to a previous tread on the secondary system. .

Report back then we can direct you to the next step. Just explain your version of the steps here
I could but I could also describe how to empty the ash tray. Problem with that is it is premature to go into the LT5 rebuild when it's not clear that's where the problem is

(or find the old thread that covers this to send you too)
When you find the old thread that covers this (there are many) just post it here so we can all see what you found

In good time. In good time. Let's find out if it's needed.

Originally Posted by Dynomite

When you find the old thread that covers this (there are many) just post it here so we can all see what you found

In good time. In good time.

[Blue Flame Restorations]

I don't know???? It may just be me but I keep searching for a "Tread" and can't seem to locate one???????????

Scottfab, it's all in good fun on my end. I just get a kick out of your sarcastic, one sided opinions. You makin' fun of my fuzzy dice?????

[scottfab]

Originally Posted by Blue Flame Restorations

I don't know???? It may just be me but I keep searching for a "Tread" and can't seem to locate one???????????

Ok I'll search. My last addtion was a rebuild of the pump again.
I did it 11yrs ago with plain rubber. This time I used some fiber
infused rubber from thin cleaning gloves. I'm betting it will last longer.

Originally Posted by Blue Flame Restorations

Scottfab, it's all in good fun on my end. I just get a kick out of your sarcastic, one sided opinions. You makin' fun of my fuzzy dice?????

I know. I have tongue in cheek as I post too. I have more fun with the magic "beam plates", "clutch switch bypass" and "secondary ripping out" than any other mods. It's a serious "to each their own" but can help comment when newbies are pushed to "if it's broke rip it out" rather than a balance of "think it though. It may not be for you".
BTW I've heard that beam plates improve gas mileage.

[Blue Flame Restorations]

Originally Posted by scottfab

I know. I have tongue in cheek as I post too. I have more fun with the magic "beam plates", "clutch switch bypass" and "secondary ripping out" than any other mods. It's a serious "to each their own" but can help comment when newbies are pushed to "if it's broke rip it out" rather than a balance of "think it though. It may not be for you".
BTW I've heard that beam plates improve gas mileage.

I just knew that was a smart move!!!!!!

PS If you want some good entertainment, go to the CF C7 Section and say something negative about the new tail lights. OMG!!!!!!!!!!

[scottfab]

Ok, after looking here on the forum I found several treads that touch in the vacuum actuated secondaries including my recent rebuild of the pump. However, if you want a detailed system operation theory and diagnosis go look at:

http://www.zr1netregistry.com/Inform...Diagnosis.aspx

Later edit: I think it move to here:
http://www.zr1netregistry.com/Inform...Diagnosis.aspx

Originally Posted by Blue Flame Restorations

I just knew that was a smart move!!!!!!

PS If you want some good entertainment, go to the CF C7 Section and say something negative about the new tail lights. OMG!!!!!!!!!!

Cool, that is my next stop.
I think I'll say "nice Camero lights or is that the bat mobile?"

[zr1mom]

Not to worry if its cycling that often it soon will become very quiet. When it burns out.

[tpr60]

Scott, nice link on the vacuum system, I could of used that a year ago.

[bad-zr1]

Originally Posted by Schrade

No Sir - can't hear it while driving, but I can just hear it while idling.

So if I TIME the intervals, I can guage a vac. leak? Does the interval have a normal spec time? Such as for a new motor? Is it in FSM?

I don't have a loping idle, which is usually a tell-tale indication of intake leak...

And is the ground for the vac pump integrated into the mount? I'd really like to fab up some cushion into mounting bushings...

If you can hear it run with the engine idling you have a problem. It should not come on with the engine running at an idle. The 10-15 seconds off then on for a second or two is tested with the key on but the engine off. With the engine running the motor is supplying 15-17 inches of vacuum, more than enough to keep the pump shut off.