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[jonathanh]

cheers for that.  I have checked the servo pipe already and it's fine (the connector into the manifold was actually a bit loose originally, although the problem persisted afterwards)

Heater bypass valve, the pipe that comes out of the top of it is only about 6 inches long and the open end is in the general vicinity of where the easy start has an effect on the revs.  Would I be correct in assuming that the vac shouldn't come from the valve end though?  where about should the other end of the pipe be?

cheers again.  feels like i'm getting closer to the root of the problem!

gill

HBV vac feed comes through the bulkhead near the heater pipes.  there is seperate vac hose coming from a T in the servo vac hose that is the vac feed into the bulk head.  Inside the cabin there is a VAC servo that switches vacuum on and off to the HBV

sounds like the vac hoses are not in the best shape....

[erubus]

i should add that i don't have any sort of manual for the car, been going between carlton and cavalier manuals trying to piece together some sort of useful info, don't think either of them had HBV's though.

[erubus]

magic cheers.  the hoses are in pretty good condition except for this one as far as i can see, a couple of the soft rubber elbows were a bit perished and have been replaced.  gonna have a poke around now and see what i can find.  will keep you posted.

cheers again

[erubus]

actually if memory serves, there were two vac pipes coming out of the bulkhead on the passenger side, and one of them went into the same hole as one of the heater pipes which i thought a little odd, really am gonna go look this time haha

[erubus]

right, i have , just after the non-return valve on the servo pipe, two vac pipes, the second one goes to the EGR and the first goes into the passenger side bulkhead, then another one which comes from the same place (n/s bulkhead), and goes into the drivers side bulkhead right underneath the top heater pipe.  the top of the HBV has a length of pipe around 6 inches long with an open end.  will try to upload pics.

[erubus]

HBV with open pipe
pipe coming out of driver side bulkhead underneath top heater hose
pipe from servo hose and pipe from under heater hose both going through n/s bulkhead

[erubus]

had a look under the dash and found that the pipe that goes into the bulkhead was attached to a yellow and black hose and there was a black hose going into it as well, this corresponded to a hole on the other side of the grommet, so i attached the vac hose for the HBV into this.  No difference to the running though.

I'm going to go ahead and fit another inlet manifold i think.  The revs are still going up when i spray in the easy start, and although i can't feel any air going in, there must be somewhere! 

i took off the FTVV and sprayed easy start onto it while still connected by the pipes and the revs didn't change, it seems to be when pointes in the direction of the dispack/back of manifold that it happens.  I wondered whether the HBV might be leaking itself, but if i blank off the black hose under the dash, which i think must be the same pipe, nothing changes with the running of the engine.  also gonna check the other end of the pipes that go into the n/s bulkhead, although blanking them off at the source on the servo pipe doesn't make any difference either. 

there's loads of vacuum at the servo as well btw, even after it had stood for a few days.  spraying easy start all the way down the pipe and over the connection into the inlet manifold doesn't affect the engine speed.

I've blanked off all the vac pipes coming out of the inlet manifold in turn and nothing changes, so I'm back to the manifold again.  I know that the mating faces are badly scored anyway, so i'd be as well changing it. (it's fitted with HPV silicone just now to try and seal the scores)  i think there has to be a crack in it somewhere, or a bad joint.

any thoughts anyone?
gill