transmisión not engaging OD on volvo 740 1991
#1
transmisión not engaging OD on volvo 740 1991
Hey guys i need some help i just bought a 1991 volvo 740 and is not going in to over drive is only using 3 gears but the light gos on en off wen i press the over drive button and the relay clicks need some help by reading on the forum foun out it coul be the over drive solenoide undet the trany any advise
#2
#3
if ya wish to bypass the OD system ya can also get a plate from these guys Volvo Overdrive Solenoid Bypass Replaces 1239928 1239679 in Stock | eBay ....or do this yourself (scroll down to see the pic posted by pierce) https://volvoforums.com/forum/volvo-...h-79482/page2/
#4
Personally i would not bypass the OD on a 3+OD tranny, why not just clean out the od unit? get on turbo bricks and you can read about people who were able to accomplish that task with the tranny still mounted... Much easier with it removed though..
Thread on non-working OD units..
http://forums.turbobricks.com/showthread.php?t=301252
Full write up for OD rebuild...
https://www.brickboard.com/FAQ/700-9...iveRebuild.htm
Thread on non-working OD units..
http://forums.turbobricks.com/showthread.php?t=301252
Full write up for OD rebuild...
https://www.brickboard.com/FAQ/700-9...iveRebuild.htm
Last edited by Bumblebeeman; 10-09-2014 at 12:53 PM. Reason: added links..
#6
Personally i would not bypass the OD on a 3+OD tranny, why not just clean out the od unit? get on turbo bricks and you can read about people who were able to accomplish that task with the tranny still mounted... Much easier with it removed though..
Thread on non-working OD units..
240 New to the M46 - Turbobricks Forums
Full write up for OD rebuild...
https://www.brickboard.com/FAQ/700-9...iveRebuild.htm
Thread on non-working OD units..
240 New to the M46 - Turbobricks Forums
Full write up for OD rebuild...
https://www.brickboard.com/FAQ/700-9...iveRebuild.htm
#9
well, both are true, depending on how you look at it. its not an EXTERNAL overdrive. and, the classic definition of an overdrive was a greater than 1:1 ratio, when in fact, most overdrives including the ones used with the British sports cars and volvo M46 were really underdrives, and OD was 1:1.
#12
#14
help
Just changed the OD solenoid for the bypass and it work awesome now i have a problem the car feels like a small loss of power and in low rpms sometimes feels like it wants to shut down im thinking the in fuel punp or something like that or maybe a tune up of sparkplugs and wires and distribution cap what do you guys think
#15
power loss from fuel starvation would normally show up at high throttle upper middle range RPMs, especially in a taller gear, like accelerating uphill in 3rd.
low RPM power stumbling could be from air leaks in the intake path (anywhere between the MAF and the head), or from ignition problems. bosch cap and rotor, volvo brand or bosch spark plugs, and bougicord sparkplug wires would get you to a baseline, ignition wise. other potential sources of ignition problems would be a tired/old coil, or a flakey ignition power module (if bosch... regina ignition integrated the power module into their square coil)
low RPM power stumbling could be from air leaks in the intake path (anywhere between the MAF and the head), or from ignition problems. bosch cap and rotor, volvo brand or bosch spark plugs, and bougicord sparkplug wires would get you to a baseline, ignition wise. other potential sources of ignition problems would be a tired/old coil, or a flakey ignition power module (if bosch... regina ignition integrated the power module into their square coil)
#17
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