|
|
|
Several weeks ago on my way to work in my 90 744ti 177k I noticed that overdrive had not engaged. After I was about ten to fifteen minutes in to my commute it went into overdrive. It was the same scenario on the way home. When checked the fluid it was a little low but filling it did not fix the problem. I swapped the relay with a known good one from my 88 wagon but that did not fix it. I also adjusted the kick down cable but the problem it still there. It appears the transmission needs to get to a certain temp before it will engage. I am considering swapping fluid as it has been about 50k since its last flush.
Is my overdrive going out or is there another solution. Thanks Bryan.
--
90 744ti, Airbox, K/N, Cold air, G-Valve, Dual boost control, VDO, Modified exhaust. 88 745 gle, 99 Camry
|
|
-
|
|
|
First I want thank everyone for the responses and I have to assume that once the solenoid is gone it cannot fixed.
--
90 744ti, Airbox, K/N, Cold air, G-Valve, Dual boost control, VDO, Modified exhaust. 88 745 gle, 99 Camry
|
|
-
posted by
someone claiming to be Joe S.
on
Thu Apr 28 03:21 CST 2005 [ RELATED]
|
|
Hello,
My '88 760 Turbo did the same thing a few years back. When the problem started, it did engage when warm (after 10 miles or so), as you said. After a week or two, it would not engage at all, no matter how warm the transmission fluid was. I replaced the soleniod and have had no trouble since. As the others have said, I would assume that the switch, relay, and fuse are okay being that you can toggle the lamp with the switch.
I hope this helps...
Joe S. - Volvo Master Technician
1988 760 Turbo w/273k miles, 1981 242 Turbo w/243k miles.
|
|
-
|
|
|
Joe, can the OD unit be taken apart for servicing?
--
Norm Cook Vancouver BC; 1989 745T 204,000KM
|
|
-
posted by
someone claiming to be Joe S.
on
Fri Apr 29 03:20 CST 2005 [ RELATED]
|
|
Norm,
By "OD unit", I'm assuming that we are on the same page (referring to the overdrive solenoid). The solenoid itself is a sealed unit and isn't really servicable. Being that they also wear out electrically, I wouldn't recommend a used solenoid. I hate to see anyone spend more money than they have to, but a new unit is the way to go if you need one. Let me know if you need anything else.
I hope this helps...
Joe S. - Volvo Master Technician
1988 760 Turbo w/273k miles, 1981 242 Turbo w/243k miles
|
|
-
|
|
|
Joe thanks for the reply but if I got a used solenoid I wouldn't intend on paying much for it.
BTW where is it located on the transmission?
--
90 744ti, Airbox, K/N, Cold air, G-Valve, Dual boost control, VDO, Modified exhaust. 88 745 gle, 99 Camry
|
|
-
posted by
someone claiming to be Joe S.
on
Fri Apr 29 08:14 CST 2005 [ RELATED]
|
|
Bryan,
The overdrive solenoid is located on the left side of the transmission (driver's side). Don't know if you have ever seen one, but it is a round cylinder about the size of a 35mm film can (maybe slightly larger in diameter). It has wiring that runs toward the rear of the transmission and attaches to the shift linkage. As you said, if you could acquire one dirt cheap, it may get you up and running again. I just meant that, if you plan on keeping the car for a long time, a new unit may be a better investment.
Good Luck,
Joe S. - Volvo Master Technician
1988 760 Turbo w/273k miles, 1981 242 Turbo w/243k miles
P.S. - If you do remove the solenoid, be sure to thoroughly clean around it first. Any dust and dirt will enter through the fluid passage and mess things up.
|
|
-
|
|
|
My mother-in-law's 89 740 had that exact symptom. It was remedied with a new solenoid.
Flushing the fluid first does sound like a good idea, even if it doesn't fix the OD shifting.
|
|
-
|
|
|
I just did a check on-line $140.00 ouch. I will try a flush if that doesn't work I will be looking for a used one.
--
90 744ti, Airbox, K/N, Cold air, G-Valve, Dual boost control, VDO, Modified exhaust. 88 745 gle, 99 Camry
|
|
-
posted by
someone claiming to be jonnyb
on
Wed Apr 27 10:57 CST 2005 [ RELATED]
|
|
OD solenoid $70.00 on ebay with free shipping.
http://search.ebay.com/volvo-solenoid_W0QQfkrZ1QQfromZR8
$95.00 at FCP Groton web site,don't know if the "O" rings are included with the solenoid, then add shipping to that.
http://www.fcpgroton.com/VolvoTranny/volvo740b230tranny.htm
|
|
-
|
|
If the Arrow light goes on and off when the relay is pulsed by the shifter button, the control circuit (and presumably, the solenoid) are OK. I say "presumably" for the solenoid because the OD does finally engage. I can't imagine anything in the relay-to-solenoid control that would delay the solenoid operation.
Here is a summary of the fairly simple OD control circuit:
OD operation involves 5 components and the wiring that connects them...
1) Fuse 11 (fused voltage supplied to items #2, #3, #4, and #5)
2) The Shifter button/switch (turns OD relay off and on)
3) The OD relay (controls Upshift Arrow light and Solenoid) (separate wires)
4) The Upshift Arrow light (ON means relay and solenoid OFF)
5) The OD solenoid (Allows OD engagement when ON, the "default" Relay state at Key On)
If the Shifter switch makes the Arrow light (#4) go on and off, then items 1, 2, and 3 are OK, and the problem is most likely the undercar wire to the Solenoid (#5) or the wire connector terminal.
Less likely would be be Solenoid itself.
Also possible (but very unlikely) would be the relay controlling the Arrow light (#4) correctly, but failing to activate the Solenoid.
An internal transmission problem is also possible.
--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
|
|
-
|
|
|
The shifter switch does make the light go on and off.
The part that bothers me is that it kicks in about the same spot every day whick is why I assumed that it was either a warm up or fluid issue.
I need to drive it again to warm up the transmission and recheck the fluid.
Thanks for the response Bruce.
--
90 744ti, Airbox, K/N, Cold air, G-Valve, Dual boost control, VDO, Modified exhaust. 88 745 gle, 99 Camry
|
|
-
|
|
|
Hey Bryan, when the car is off can you hear solenoid clicking when you turn OD on and off?
I have the same problem, only to a much lesser degree. IE it will not jump into OD until after a few miles.
--
Norm Cook Vancouver BC; 1989 745T 204,000KM
|
|
-
|
|
|
I have a very similar problem on my '87 GLE Wagon. OD would engage at increasing times/rpms etc. Finally the OD isn't working at all.
I'm planning on going to PnP and picking up a used solenoid (I'm cheap!)
I'm also experienceing deteriorating harness wiring symptoms and I need to replace the harness. I don't think these two are related though.
|
|
-
|
|
|
OD Solenoid replacement did not solve the problem. Now I am looking at a used tranny swap from the boneyard.
Anything else I should try before I do that?
|
|
|
|
|
