What causes an engine to lose vacuum?
Leaking or disconnected vacuum lines, leaks in vacuum operated devices, or intake manifold gaskets are common causes for low vacuum. When the throttle plate is wide open it will almost eliminate restrictions between the outside air pressure and the pressure inside the cylinder.
Is it expensive to fix a vacuum leak?
Vacuum Leak Repair Cost: Everything You Need to Know. Depending on where the leak is in your vacuum system the repair cost can range from as low as about $150 to as much as $1,000. Auto Repairs Are EXPENSIVE. As you know, your engine requires not just fuel but oxygen to maintain a combustion reaction.
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:
Where is the vacuum line located in a Volvo?
Any older generation Volvo with a B23** engine should have similar operation and routing of vacuum lines. Turbo redblock engines have their intake air box located on the left side of the engine compartment, with vacuum leak troubleshooting also involving the turbocharger and inter-cooler connections.
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.
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.