How big are the vacuum lines on a Saab?
Original vacuum hoses are 4-mm inside diameter (ID), same size as most of the wiper washer hoses. The same rubber hose is also used in the secondary air injection (SAI) system on n/a models. These were replaced around 100k miles, some for the second or third time. Fig. 4 Part of the positive crankcase ventilation system.
What is the purge valve on a Saab?
Fig. 8 The purge valve hose for the Evaporative Emission System connected to the throttle body is not an actual vacuum line (different size and material). It allows fumes to be sucked from the charcoal canister in the wheel well into the intake and burned.
Where is the charge air pipe in a Saab?
Runs along the “charge air pipe” to the turbo bypass valve (BPV) at the front of the engine compartment. This is the longest of the four hoses.
What happens if you have a vacuum leak in your engine?
A vacuum leak can cause a myriad of driveability problems as it introduces extra, unwanted air into the engine, leaning out the air/fuel mixture. Modern internal combustion (multiport fuel injection) engines use intake vacuum to operate sensors, actuators, power brakes (on some vehicles).
Original vacuum hoses are 4-mm inside diameter (ID), same size as most of the wiper washer hoses. The same rubber hose is also used in the secondary air injection (SAI) system on n/a models. These were replaced around 100k miles, some for the second or third time. Fig. 4 Part of the positive crankcase ventilation system.
Fig. 8 The purge valve hose for the Evaporative Emission System connected to the throttle body is not an actual vacuum line (different size and material). It allows fumes to be sucked from the charcoal canister in the wheel well into the intake and burned.
Runs along the “charge air pipe” to the turbo bypass valve (BPV) at the front of the engine compartment. This is the longest of the four hoses.
What happens when you have a vacuum leak in your engine?
Engine vacuum leaks are commonly associated with the following symptoms, but keep in mind that this is not an exhaustive list. An engine with a vacuum leak could potentially run normally, but it may idle faster than usual, idle roughly, misfire, hesitate, or stall. You may find your vehicle doesn’t accelerate as well as it typically does.
What kind of fuel line does Saab use?
In the picture at left, the stock 4-mm rubber hose is was replaced by a 4.8-mm reinforced fuel line. It is less likely to clog, and lasts longer. The check valve (PCV valve) needs periodic replacement.