What does a vacuum leak on a Volvo mean?
As noted by the orange line, this is the actuator and vacuum line for cruise control. This system uses vacuum to operate, but uses its own pump to create vacuum as opposed to using engine vacuum. Any leaks in this system would only affect cruise control operation. The actuator looks like this:
Are there any problems with the Volvo system?
Volvo has had problems with this system since it was introduced in 1976. Volvo’s still run into the same issues on their newer models. Possibly in theory Volvos system is better, but in reality it gets overlooked and inevitably becomes clogged up and causes oil leaks and idle problems.
Are there any problems with the Volvo flame trap system?
Another Volvo oddity is the use of a flame trap system where every other car manufacturer in the world uses a PCV system incorporating a PCV valve. Volvo has had problems with this system since it was introduced in 1976. Volvo’s still run into the same issues on their newer models.
Where is the vacuum valve on a Volvo 940?
Leaks at any connections can cause driveability problems, especially at low RPM or at idle. The IACV itself may also need to be cleaned or replaced. The valve itself is located underneath the intake manifold. Below is an IACV for a Volvo 940: As noted by the orange line, this is the actuator and vacuum line for cruise control.
Are there any diagrams for a Volvo vacuum?
Below is a modest collection of Volvo vacuum connection diagrams I have located or created from Volvo service manuals and other sources. I’m always looking for more diagrams to help our fellow Volvo owners who are having a tough time locating these. Under Hood Vacuum Label Collection here.
What kind of vacuum system does a Volvo 940 GLE have?
1991 940 GLE engine bay with markup of vacuum systems. The above picture is the engine bay of my 1991 Volvo 940 GLE. It has a B234F DOHC engine. Any older generation Volvo with a B23** engine should have similar operation and routing of vacuum lines.
Can a flame trap be replaced in a Volvo?
Almost impossible to diagnose, the easiest fix is to replace this part. The flame trap itself should be free of blockage. Rarely do they need more than a cleaning rather than replacement. With a careful hand, it is possible to replace this part without removing the intake manifold.
Are there any problems with the Volvo 240?
It commonly fails in the open position allowing super heated air to be drawn into the engine, which reduces performance as well as dramatically shortening the life of the expensive air mass meter. The seats in the 240 are very comfortable when they are in good condition. 240 seats offer excellent adjustable lumbar back support.
Why does my Volvo 940 have a leak?
The flexible intake tube itself may also leak along the joints. The Volvo 940 has a thermostat just before the intake box which is normally open in warm weather. In cold weather, the valve closes and intake air is routed past the exhaust manifold in order to warm it up.