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[Webby the Bear]

ps are these the vac pipes to the pollen filter vac box?

[Webby the Bear]

and a quick pic of the pipes at front. none seem damaged and ive traced the front ones back and I believe theyre all in the right place.

[TheBoy]

Webby, after using the car, turn off, wait 2 or 3 minutes, then unplug the vac from one of the multirams. You should hear the air suck in, if you don't, you have a leak .  And stop oppsing around with carb cleaner, it oppss every bit of rubber it touches, causing more grief!!

[chrisgixer]

Chris, just been searching the site for more posts and experiences on this multiple ram issue.

I noticed a post from you that said when you turn the engine off there is a fading hiss for a second or two. . . . . . Definitely got this!!!!! Always had it in fact.  . . .

You have a leak. It should hold vac for a good few days. Although the hiss could be other things. Could be the brake servo line where it rubs on the ac pipes by the scuttle drain, just for example. But sumats not tight somewhere.

[Webby the Bear]

Evening fellas. Thanks for your replies, really appreciate it.

Update!

Went for a Toby Cauvery tonight.  . Mmmmmm. . . And got the wife to help me check the rear multiram. I told her to rev it quickly up to 5 grand and sure enough I observed the rear actuator move. This is of course good.

So evidence so far. . .

Lack of 'thrust' upon flooring the loud pedal. . . Progressive acceleration and not the 'push you in to the back of the seat that it should be.

Multi rams work.

Hissing when engine switched off.

So if the multirams are working can I reasonably assume that my multi ram vac lines are all good. Or could there still be a vac issue even with them working?

[Andy H]

When you floor it the manifold vacuum goes to nothing and the vacuum system relies on stored vacuum in the reservoir. Chris is right, fix the leak and you should feel a noticeable improvement 

[Webby the Bear]

Thanks Andy.

So in short, even though i've seen my multi rams perform..... the fact that i got a big hissing for a second or two after engine shut off means im still losing vacuum and thats causing the problem.

ill do as TB and chris say... ill run the car and then pull a few vac pipes to see if theres a loss of vacuum as a starting point. if i start with all the ones at the front multi rams then the t piece at the brake servo and the brake servo itself. good start point? 

[Andy H]

Early cars had one reservoir shared by the multirams and the heating controls, later cars have two separate ones.

I was never conviced that the multirams on my 1994 car were working quite right, coincidence?, I don't think so.

[Webby the Bear]

Thanks again Andy,

While on the subject of vac resevoirs... im presuming im looking for obvious damage / holes or vac pipe damage to the resvoir etc.?

Well thats easy on the front one. but how do i get my grubby paws on the rear one near the pollen fliter? looks deep in there lol

[TheBoy]

The easiest to pull off Webby is the one going to rear multiram.

[Webby the Bear]

The easiest to pull off Webby is the one going to rear multiram.

cheers mate 

[Webby the Bear]

just to add though..... is it not a tad strange that i can hear this vac leak on engine shut down yet ive found my multirams to be moving?

[TheBoy]

just to add though..... is it not a tad strange that i can hear this vac leak on engine shut down yet ive found my multirams to be moving?

Nope

[Andy H]

just to add though..... is it not a tad strange that i can hear this vac leak on engine shut down yet ive found my multirams to be moving?

Not really.
If you rev to 5000 rpm with no load you are going to close the throttle again very quickly - before the vacuum has a chance to leak away again.

[Webby the Bear]

just to add though..... is it not a tad strange that i can hear this vac leak on engine shut down yet ive found my multirams to be moving?

Not really.
If you rev to 5000 rpm with no load you are going to close the throttle again very quickly - before the vacuum has a chance to leak away again.

aha! so because i did this quick test whilst the car was stattionery (and not on the move with my foot continually down) then it will show its working.....but on the move my foots in there wanting acceleration and the vacuum disperses quickly, thus no pull.

i think i got ya. soz for all the Q's