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Car Forum / Volvo Cars / January 20061985 740GLE overdrive woes
Good day, I have a 1985 740 GLE with an M46 manual transmission with overdrive. Overdrive acts flakey. At normal to high temps, the overdrive can be engaged shortly after hitting the road. The warme it is, the quicker it engages. At low temps, it takes quite a while but it does eventually engage. I have eliminated the switch on the gear selector (shifter). I have opened up the relay and cleaned the coil contacts. I have checked the terminations at the solenoid. I addition, if I move the gear selector to the left a bit, the overdrive will disengage leading me to believe that there are 2 problems; one with the 4th gear switch and something somewhere else. I see on the schematic, that the EGR solenoid is in the same circuit but I figure that it's just drawing power from the same place as the relay circuit. Where exactly is the 4th gear switch? Under the console? Can it be adjusted? Can I reach it without pulling the console? I have pulled the top cover of the console off, but never the shifter boot. Any ideas on the overall problem? I don't really want to "diagnose by replacement" the solenoid as it is pricey. Could this be a problem with the transmission oil? Drain and change? TIA regards jimB -------------------------------------------- JimB -------------------------------------------- my SPAM defense: Replace all the X's in email address with M Oh I forgot, relay does not click until the overdrive is ready to engage. That is, until car warms up, no relay noise. jimB -------------------------------------------- JimB -------------------------------------------- my SPAM defense: Replace all the X's in email address with M > Oh I forgot, relay does not click until the overdrive is ready to > engage. That is, until car warms up, no relay noise. My 240 has this exact same set of problems, it's the 4th gear switch on the side of the transmission housing. It gets worn and will prevent the overdrive from engaging until it warms up because it thinks the car is not in 4th gear. > Good day, > [quoted text clipped - 6 lines] > > At low temps, it takes quite a while but it does eventually engage. replace the OD switch on the gearbox. I think they can get contaminated with oil which makes them sluggish with cold.  Signature--- Marten >replace the OD switch on the gearbox. I think they can get contaminated >with oil which makes them sluggish with cold. Is that the 4th gear switch? It's on the gearbox? I am glad I didn't rip out the console. jimB -------------------------------------------- JimB -------------------------------------------- my SPAM defense: Replace all the X's in email address with M >>replace the OD switch on the gearbox. I think they can get contaminated >>with oil which makes them sluggish with cold. > > Is that the 4th gear switch? It's on the gearbox? > > I am glad I didn't rip out the console. rh side of the gearboxcover (the other one is for reversing lights). Resist the temptation to bypass the switch, as it will then be possible to engage first gear and reverse with the OD switched on, which is not_a_good_thing Signature--- Marten >rh side of the gearboxcover (the other one is for reversing lights). >Resist the temptation to bypass the switch, as it will then be possible >to engage first gear and reverse with the OD switched on, which is >not_a_good_thing no it would not. thanks much jimB -------------------------------------------- JimB -------------------------------------------- my SPAM defense: Replace all the X's in email address with M |
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