Exhaust Vacuum Pump
Discussion
Afternoon all.
Need a little help trouble shooting an exhaust issue.
I think my exhaust valves are stuck open (noisy).
Complicated slightly by having an aftermarket (Capristo) exhaust, but I assume the basic functioning of the exhaust is as per stock.
Basically, to start diagnosis, does the vacuum pump only run when the valves are to be closed, or does it run all the time, and then a solenoid in the system connects the pump to the actuators when the bypass valves should be closed?
Should I be able to hear the vacuum pump when the ignition is switched on, prior to engine start?
Many thanks
David
Need a little help trouble shooting an exhaust issue.
I think my exhaust valves are stuck open (noisy).
Complicated slightly by having an aftermarket (Capristo) exhaust, but I assume the basic functioning of the exhaust is as per stock.
Basically, to start diagnosis, does the vacuum pump only run when the valves are to be closed, or does it run all the time, and then a solenoid in the system connects the pump to the actuators when the bypass valves should be closed?
Should I be able to hear the vacuum pump when the ignition is switched on, prior to engine start?
Many thanks
David
The pump runs whenever necessary to maintain vacuum in the vacuum chamber.
In practice this means running at start up and then briefly after each time the valves are pulled shut, rather than all the time the valves are shut.
You should be able to hear it if you switch the ignition on with the door open.
In practice this means running at start up and then briefly after each time the valves are pulled shut, rather than all the time the valves are shut.
You should be able to hear it if you switch the ignition on with the door open.
The valves are part of the backbox / muffler so if that's been replaced then its down to if the Capritso has them, and works the same way.
Looking at the Capristo website about the Vantage Sports Exhuast, it says:
Perhaps a call to Capristo would be in order...
Looking at the Capristo website about the Vantage Sports Exhuast, it says:
Capristo Website said:
Capristo's Sports Exhaust System for the Aston Martin Vantage V8 and V12. Made of 1.4828 (T309) stainless steel. The system can be controled via the on-board control system. Optionally you can order the programmable control unit.
Options include:
Muffler
damped cat delte pipes (only V12)
not damped cat delete pipes (only V12)
progr. control unit CES
So it would seem that the valves are controlled by the OPTIONAL on-board control system. Not sure if its clear if that's vacuum based or not, or perhaps more to the point, if the person who fitted it (I'm assuming it wasn't you), opted for the optional control system or just decided to have it in simple "loud all the time" configuration.Options include:
Muffler
damped cat delte pipes (only V12)
not damped cat delete pipes (only V12)
progr. control unit CES
Perhaps a call to Capristo would be in order...
Anybody know where the vacuum pump is to check?
I tried removing fuse 22 for extra noise, which was great and not too loud. However my tracker kept signalling an alarm, so I think the installer used this line to detect engine on when moving.
2 options , find the tracker and re-wire or disable the pump, depending on what is easier to get to.
Don't know where the tracker unit is .
I tried removing fuse 22 for extra noise, which was great and not too loud. However my tracker kept signalling an alarm, so I think the installer used this line to detect engine on when moving.
2 options , find the tracker and re-wire or disable the pump, depending on what is easier to get to.
Don't know where the tracker unit is .
martindesu said:
Thanks for the picture. The chassis is not shown, so is it under the car or in the boot near the fuse box. Ok, fixed it. Turned out the solenoid between the vac pump and the bypass valves had stuck.
Sounds simple, but took ages to diagnose, so I few things I learned along the way. Remember I have an after market exhaust, so YMMV.
Vac pump. Runs as the ignition is switched on. Located behind right rear inner wheel arch. Quite noisy, but should stop quite quickly, as soon as a vacuum is drawn. Mine was running continuously.
I was expecting the problem to be a split hose or loose vacuum connection. When manually operating the bypass valves I could hear air hissing somewhere above the right hand tailpipe, reinforcing this thought, so spent ages looking for leaks or disconnected pipes. This was made worse, for me, as the Capristo install had left some of the original Aston vac pipes in place, so I thought that those should have been connected, total red herring. Hissing turned out to be air venting from the solenoid, has to go somewhere!
Access is a pig. The Aston vac pump, and the Capristo control module are virtually invisible, unless you remove the right rear wheel, take out a couple of posidrive screws then peel the plastic inner wheel arch forward, upon which you can start to see the pump and pipe work.
Once I had found the solenoid, I removed it, gave it a tap, checked it electrically, refitted and all was working again. Tip here, if checking the solenoid valve, suck on the air connectors, don't blow. Different results!
Finally, thoughts on the Capristo system. Sounds spectacular, and stainless silencer and pipe work is beautifully made. I like the programmable control module and the remote for the bypass valves is a great party piece.
However, I think that the UK installation network need some attention. The importer was very helpful on the phone, but is really just a sales office, and could not recommend anyone to have a look at the car to help with fault finding, bar Porsche or Ferrari main dealers, who were understandably a little reluctant. There is, apparently, no Aston dealer or specialist currently on board for installs. The quality of the install on mine is not great, the solenoid loosely cable tied to vac pipes etc.
The Capristo solenoid is quite readily available, Pierburge part 7.0124.02.0, used as a boost pressure control valve, £20-30 or so.
David
Sounds simple, but took ages to diagnose, so I few things I learned along the way. Remember I have an after market exhaust, so YMMV.
Vac pump. Runs as the ignition is switched on. Located behind right rear inner wheel arch. Quite noisy, but should stop quite quickly, as soon as a vacuum is drawn. Mine was running continuously.
I was expecting the problem to be a split hose or loose vacuum connection. When manually operating the bypass valves I could hear air hissing somewhere above the right hand tailpipe, reinforcing this thought, so spent ages looking for leaks or disconnected pipes. This was made worse, for me, as the Capristo install had left some of the original Aston vac pipes in place, so I thought that those should have been connected, total red herring. Hissing turned out to be air venting from the solenoid, has to go somewhere!
Access is a pig. The Aston vac pump, and the Capristo control module are virtually invisible, unless you remove the right rear wheel, take out a couple of posidrive screws then peel the plastic inner wheel arch forward, upon which you can start to see the pump and pipe work.
Once I had found the solenoid, I removed it, gave it a tap, checked it electrically, refitted and all was working again. Tip here, if checking the solenoid valve, suck on the air connectors, don't blow. Different results!
Finally, thoughts on the Capristo system. Sounds spectacular, and stainless silencer and pipe work is beautifully made. I like the programmable control module and the remote for the bypass valves is a great party piece.
However, I think that the UK installation network need some attention. The importer was very helpful on the phone, but is really just a sales office, and could not recommend anyone to have a look at the car to help with fault finding, bar Porsche or Ferrari main dealers, who were understandably a little reluctant. There is, apparently, no Aston dealer or specialist currently on board for installs. The quality of the install on mine is not great, the solenoid loosely cable tied to vac pipes etc.
The Capristo solenoid is quite readily available, Pierburge part 7.0124.02.0, used as a boost pressure control valve, £20-30 or so.
David
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