bwright002
Active member
- Joined
- Feb 12, 2005
Have a 78 242 with a manual B21(e I believe).
I've been trying to track down a rough idle from cold. I was reading a thread about idle that was referring to a link between idle, vacuum when removing the gas cap and the evaporative system.
My evap canister has a Volvo part number of 1266459, round in shape, up by the passenger side headlight with two hoses going into the top and one hose coming out the bottom. One of the hoses (the smaller diameter of the two) was a loose fit on the canister, so I've replaced it with fresh hose that is a tight fit. The other end goes onto a plastic tubing line.
Replacing the hose has given me a smoother idle (at 900-950 rpm), so that's good news, but I'm still hearing a major suction when I release the red Volvo gas cap (has the four holes in the underside of the gas cap). And the car will make a surging or pulsing noise if I run it much below 1/3 tank.
The hose that comes out the bottom doesn't connect to anything. Is that correct? The canister already has a vent hole in the bottom, so I'm wondering why the bottom hose isn't connected to something.
I've looked in my Bentley's as well as the Haynes manual for the pre-80 240's. Not finding any details about the bottom hose.
Car runs great, so I don't think there's anything seriously amiss, but a hose that goes nowhere has me wondering.
78 242 180,000 mi, 4 speed.
I've been trying to track down a rough idle from cold. I was reading a thread about idle that was referring to a link between idle, vacuum when removing the gas cap and the evaporative system.
My evap canister has a Volvo part number of 1266459, round in shape, up by the passenger side headlight with two hoses going into the top and one hose coming out the bottom. One of the hoses (the smaller diameter of the two) was a loose fit on the canister, so I've replaced it with fresh hose that is a tight fit. The other end goes onto a plastic tubing line.
Replacing the hose has given me a smoother idle (at 900-950 rpm), so that's good news, but I'm still hearing a major suction when I release the red Volvo gas cap (has the four holes in the underside of the gas cap). And the car will make a surging or pulsing noise if I run it much below 1/3 tank.
The hose that comes out the bottom doesn't connect to anything. Is that correct? The canister already has a vent hole in the bottom, so I'm wondering why the bottom hose isn't connected to something.
I've looked in my Bentley's as well as the Haynes manual for the pre-80 240's. Not finding any details about the bottom hose.
Car runs great, so I don't think there's anything seriously amiss, but a hose that goes nowhere has me wondering.
78 242 180,000 mi, 4 speed.