|
||
|
25th June 2024, 21:15 | #81 | |||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,649
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Yes Stefan, I renewed all of them (black and green) six years ago but it made no difference to the (then) hunting idle.
Quote:
The loan manifold chamber currently on my engine has lost both its brackets! Quote:
Quote:
That's an interesting idea Matt, thank you. I'll look into that further. Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
|||
26th June 2024, 06:59 | #82 |
Gets stuck in
Rover 75 Connoisseur 2.5 V6 auto Join Date: Jan 2008
Location: Chatteris, Cambridgeshire
Posts: 921
Thanks: 320
Thanked 159 Times in 127 Posts
|
Years ago, on a previous KV6, I had a manifold with a leak. I eventually found that the manifold was leaking, by hearing a faint hiss, hardly detectable above the normal engine noise. By putting my head close to the manifold, and slowly running my hand around, I found a leak around the back, probably on the seam.
Previously I had a rattle from the manifold and investigated taking it apart, but without actually doing much, abandoned that idea, so I may have caused the leak? A change of manifold was necessary. |
26th June 2024, 12:35 | #83 |
Avid contributor
Rover 75 Saloon Join Date: Jun 2018
Location: Ballynahinch
Posts: 205
Thanks: 69
Thanked 60 Times in 23 Posts
|
My sympaties are with you Simon. It seems that you are in in some alternative universe where the unthinkable happens! Yesterday I disconnected the pipe leading from the iinlet manifold and forgot to replace it. When I started the engine it raced up to 2500 rpm before settling down at 2000 rpm. I just wondered could your problem be with the servo connection.
Fred |
26th June 2024, 12:36 | #84 |
Posted a thing or two
rover 75 club se Join Date: Apr 2011
Location: Leicester
Posts: 1,752
Thanks: 358
Thanked 419 Times in 310 Posts
|
Worth considering inspection of the alloy inlet manifolds have no cracks or open thread holes . Some of these are for coil /and engine cover mounting and also there are screws for the plate along at the rear. Without having the manifolds in front of me , i cannot recall which if any have open threads into the alloy manifolds. A resin applied along the manifold seams would at least provide a tempory seal,as well as the throttle body to manifold join as you now have nothing to lose ,should a smoke test prove to be negative. Your previous posts going back with missfire and tickover history over many years , might suggest that there is another underlying issue present here. You have stated that in previous instances ,idle and performance were absolutely fine ,only for the problem to return at a later date. So you would not really know that the donor manifold that you tested would be a permanent definitive fix, unless it was used long term. I have a feeling that a smoke test will not reveal a result, but well worth a try. That result failing, would point to another underlying root cause i would think, that has worsened over a period of time. Hopefully it will , but doubts are now stacking up. Good luck simon ..
|
26th June 2024, 12:56 | #85 | |
Posted a thing or two
rover 75 club se Join Date: Apr 2011
Location: Leicester
Posts: 1,752
Thanks: 358
Thanked 419 Times in 310 Posts
|
Quote:
|
|
26th June 2024, 13:35 | #86 |
Posted a thing or two
rover 75 club se Join Date: Apr 2011
Location: Leicester
Posts: 1,752
Thanks: 358
Thanked 419 Times in 310 Posts
|
Just a little further to the brake servo. I have renewed my servo to engine vacuum pipe. They are a pain to remove and refit . The inlet to the servo is very difficult to refit,and i ended up using a little resin when rejoining ,as although it entered with difficulty , i could not get the pipe to fully engage a couple of MM short. There is also a "one way" valve in the pipe which can stick or not function fully after years of service. This can be checked before removal by the use of a length of hose attatched to the pipe end. It should give 100 % one way seal only. If not then there will be air drawn back into the system. The brake operation would seam to function ok on the pedal and would not be that noticeable,as it could be intermittent. The "sinking" pedal syndrome on the automatic was the reason that i changed mine originally , but this in itself made no difference to the outcome on this,and has always been present on the autos.so i understand. ....
|
26th June 2024, 15:36 | #87 | ||||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,649
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Thank you Stewart, Fred and Stefan for your helpful suggestions. Please keep them coming because even if I've already checked, it helps to focus our attention and narrow down the possibilities.
They seem to be obsolete now, both new and used. Even if I found one it would be expensive, probably in poor condition and with no guarantees. Quote:
Quote:
I've found a company specialising in smoke testing. They have equipment for hire. I intend to contact them to find out more about this process. Quote:
Quote:
This afternoon I removed the balance VIS actuator. The seal was very flat and I have spares. My preferred solution though is a smoke test so that I don't waste time, money and effort replacing things which are perfectly o.k. The diagnostic work continues! Thank you all again for your interest. Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
||||
26th June 2024, 18:44 | #88 |
Posted a thing or two
rover 75 club se Join Date: Apr 2011
Location: Leicester
Posts: 1,752
Thanks: 358
Thanked 419 Times in 310 Posts
|
Quick question simon. Maybe stocktake would know .. Under the fine clips that ALWAYS break ,whilst removing the motor covers on the vis motors , Is there a gasket ? just another point to mention that this is also a point of possible air ingress. Definite a NO NO to check this as the clips WILL break unless you use the stocktake method. A tempory strip of cellotape around the join would suffice to check whilst in situ . I would bet that there are gaskets under there ,but unfortunately cannot be viewed without dismantle of the vis box itself...
|
26th June 2024, 18:58 | #89 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,649
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
I'll report back in a few days. Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
|
|
|