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My "new" '93 945 has a problem with cruise control. It has trouble keeping up with set speed. It will not completely disengage, but will loose a lot of the speed on the uphill, then after a downhill it will maintain on level road. I checked the vacuum lines and they seem fine. I disconnected the line that goes from the servo to the T connection on the bottom of the vacuum pump and gave it a good suck. That caused the servo to pull the cable in a ways. I then plugged the tube with my finger and held it there for a while. Servo maintained tension of the throttle cable. So, the servo diaphragm is good. The elbows on the vacuum line are good also. What else is there? I noticed that the vacuum pump had another nipple on it, white in color that had no hose attached to it. Is this normal or am I missing a vacuum connection to something? Any suggestions on how to trouble shoot?
TIA
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Vladimir. '98 S70 base, 5-speed manual - his, '93 945 - hers
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On my 940 it was the leaking vacuum bleed-off switch that gets activated by the brake pedal arm.
The picture below is not for a 940, but it shows the switch as item #4. You'd only have just 1 if you don't have a clutch pedal.
The part # is 1367159 Air Vent Valve. It might respond to some adjustment for a more positive closure action by the pedal arm. But it's a PITA to get at.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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Thanks! It was the pedal switch. I have actually been able to service it. It has a little o-ring and the plastic plunger that goes through the o-ring sealing the switch. When the pedal is pressed the plunger is released and breaks the seal with the o-ring. The o-ring looked like new when I picked it out of the switch. Not cracked or damaged. Same with plunger. So, I decided that it just needed a bit of grease to re-invigorate the sealing properties. I tried it and it worked great. Looks like the switch is meant to be serviced. It is German made by Hella and is very nicely made and meant to be opened. Possibly had some grease in there that dried up. I used food-grade petroleum grease. It is not very stiff, but is pretty sticky. Hopefully it will hold up. If not I'll try white lithium. The new switch was like $35 from Tasca! That's a lot for what can be fixed relatively easily.
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Vladimir. '98 S70 base, 5-speed manual
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To the FAQ!
Steve
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See the 700/900 "FAQ" at the menu bar top screen left side.
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How did you determine it was not working?
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See the 700/900 "FAQ" at the menu bar top screen left side.
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To troubleshoot I disconnected the rubber "T" at the vacuum pump. This is where a vacuum line from the servo comes into one end of the "T" and a vacuum line from the other end of the "T" goes to thew pedal switch. The third end of the "T" plugs into the pump. I disconnected the "T" from the pump and connected mity-vac to the "T" instead of the pump. I then applied vacuum and observed the servo "picker" and pull the throttle cable. After a few seconds, however, the pucker has gotten smaller and eventually disappeared as the vacuum in the system was lost. I knew that the servo itself as well as the line and elbow going to were good from a test I did before using the same mity-vac to apply vacuum to just the segment of the line from the "T" to the servo. That test passed and the elbow looks to be in great shape. So now I disconnected the vacuum line from the pedal switch, had a helper plug it up with their finger and repeated the vacuum test. This time the pucker held as long as the helper held the pedal end of the line plugged. This isolated the switch. I removed the switch and opened it up. It was really simple to open it up, almost as if it were meant to be serviced. I figured for $35 I can try fixing it. Once open I saw that everything inside is real clean and nothing is cracked or damaged. I then realized that perhaps the seal between the o-ring and the plunger is not good. Since the o-ring looked good, not cracked or dried out, I decided to try a little grease application to the whole o-ring/plunger system. It worked great. I used petroleum food-safe grease used to assemble commercial juicers. It just felt like the right consistency. I think wheel bearing grease is probably too heavy. White lithium grease is more like what I would try if I did not have the food grade stuff. Or just simply petroleum jelly (vaseline) or something like that. Anyway, this worked. Also, a new o-ring is probably not difficult to come by. I think the switch had some grease in it to begin with and it dried out. I saw what may be evidence of some such stuff in there, but very sparse. I gooped it up pretty good in there, so I hope I did not over do it.
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Vladimir. '98 S70 base, 5-speed manual
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Hi,
About 2 years ago my 940 was experiencing the same problem and finally it failed to work completely. This was unpleasant, because I had a 120 mile commute. I replaced pretty much everything, because I could get all the used parts for almost nothing. After replacing almost everything it still didn’t work, so the only piece left to replace was the control box and finally it worked.
Don’t you have a junk yard out there in western mass? I have tons of spare parts that I buy for $20 or less. Just the other week I got two fully rebuilt calipers, pads, brake lines and rotors for $37. I love shopping at the junk yard.
Gus
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Gus, I have not seen too many junk yards with Volvos in them. I also love junk yards for parts and used to live in Boston for many years, back when Somerville was the junk yard city. I used to go to Columbia, Nissembaum (kosher auto parts) and others, but many of them closed or otherwise disappeared. I do come to Boston regularly to visit parents, so if you have a good place I can stop at while I am there, let me know.
As it is, I figured out the problem with my cruise control. It was the vacuum switch at the brake pedal. It was leaking when I checked it with Mity-Vac. I removed the switch, plugged up the hose that went into the switch and tested to make sure the servo held vacuum. It did. I then dis-assembled the switch (made in Germany by Hella), which was simple. I think it was meant to be serviced. I looked inside and saw an orange o-ring with traces of old grease-like substance. I used a dental pick to get it out of the switch and it looked very good. Not damaged in any way. So I lubed the place where the o-ring goes as well as the o-ring itself and re-assembled. Tested with the switch connected using Mity-Vac and it held! So, I put everything together, adjusted the switch position and went for a ride. Works great! New switch was around $35 from Tasca. not bad for a few minutes of tinkering.
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Vladimir. '98 S70 base, 5-speed manual
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Hi,
I was at Millis Used Auto parts today trying to get some parts for a 99 Maxima that was given to me. Dam those Nissans rust up, can’t get one of the ABS sensors out, bolt snapping. Picked up a few trinkets for other cars I am working on, other than coming home with out a sensor it wasn’t a bad day.
As I leaving a nice red 940 had been dropped off, rear end was bashed in but the front was in excellent shape so I will call to see if makes its way into the yard tomorrow. Cars of this age need to be picked clean quickly as the end up in crusher to make way for newer cars.
Gus
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I remember when I worked in Milford and lived in Boston during college and would sometimes take Rt. 109 home through Medway and Millis and see all those yards... Gues they are still there. A bit of a trip for me, but on my way to Boston, maybe. Can you give me a few places and addresses? I may stop by next time I am going to/from Boston. From late model 940's I would grab dash light bulbs (they are $8/each!), relays, especially that monster red round jobber for lights out indicator. If it's bad cruise control won't work and it costs $90 or something. I would also grab horns. They are easy to get to and very loud and good. Ignition coils (Regina and Bosch), any lens that is not too crappy. Not sure what else is quick and easy to grab.
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Vladimir. '98 S70 base, 5-speed manual
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Vladimir.
The only junk yard I go to is located on the route 109 in Millis. I go there so often sometimes they don’t even charge for small things like bulbs or relays. I had not realized that the bulbs were that expensive, as for relays my stock of replacements is plentiful. It is raining today so I will hold off going till tomorrow.
Gus
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I just replaced the dash lights on my '93 940. New ones were $8/each from dealer or FCP or any other source I could find. I did not buy them. These bulbs have a plastic base integrated into the bulb. So, I took the bulb itself out and retrofitted an LED with a 440 ohm resistor into the base and it worked great. Cost me next to nothing. I already had a boatload of these white LEDs from projects I did with kids a few years ago. These LEDs cost something like $10 for 500 shipped from Hong Kong. Resistors are even cheaper. I did a little math and figured 440 ohm would bring the voltage down for the LED and it worked. Dimmer works as well on this setup. But if someone sold me some used bulbs for like $2/each I would have just bought them or if I pulled them off the junk car myself I would use those. That being said, LED setup will probably outlive every other part on that car, so this is the last time I deal with that particular bulb set.
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Vladimir. '98 S70 base, 5-speed manual
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Gus, where's your junk yard?
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See the 700/900 "FAQ" at the menu bar top screen left side.
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Hi,
It is in the town of Millis Massachusetts, not quite a stones throw from Iowa. Unfortunately they got rid of one of the cars I was picking clean. Was there something in particular that you were looking for?
Gus
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Not really. I have a house in Boston and am there frequently. We have zero yards in IA with Volvo parts, so if I have time I'd like to hop down there and pull off a few parts as occur to me. Relays, etc.
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See the 700/900 "FAQ" at the menu bar top screen left side.
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Steve,
For past two years the 940s and previous models have been making a rapid decline in my junk yard also. When one shows up with anything that is worth saving or I can afford, ends up in my garage.
You could drop me an email when you come to Boston and if I have the time I could give you an idea what is available.
Gus
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Thanks! This may be just the thing. I have checked just about everything else to be good. Tasca sells this part for $32 - ouch! I'll try getting to it first and see if I can fix or adjust it. Need a nice warm day for this.
Thanks!
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Vladimir. '98 S70 base, 5-speed manual - his, '93 945 - hers
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Hey Vladimir,
I am glad you posted this. My 855 has a similar problem. Has trouble keeping up on hills sometimes but otherwise is fine. I know nothing about cruise control units so this will be a learning experience!
It does sound like my problem isn't as bad as yours. Maybe because the 855 has more power? It is certainly not a pressing issue for me but I wouldn't mind knowing the cause and repairing it if it is a cheap and easy fix...:)
Jim
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Is this car a turbo? If so, there is a check valve and a vacuum reservoir somewhere to maintain vacuum when the manifold pressure under boost conditions. I had a problem with this setup in my '83 240 turbo. The cruise control would not maintain speed while climbing hills.
If it's not a turbo, I would suspect a vacuum leak somewhere, but am not familiar enough with 940's to help much.
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1966 122s, 1968 142s, 1969 144s, 1979 245dl, 1989 244gl
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This car is not a turbo. I looked for vacuum leak but could not find one. As I said, the vacuum pump/motor has two ports. One has cruise control servo plugged into it and the other has nothing plugged into it. Wonder if it needs a plug or something.
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Vladimir. '98 S70 base, 5-speed manual - his, '93 945 - hers
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posted by
someone claiming to be bob
on
Fri Mar 9 08:09 CST 2012 [ RELATED]
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The extra nipple on the vacuum pump is a vent. Do not plug it. The non turbo cars normally lose momentum uphill. Sometimes you have to help it along.. Is the kickdown cable adjusted properly?
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Thanks! The loosing momentum uphill is not normal. I had a '93 945 with 240K miles and it never lost momentum. The cruise control should work uphill otherwise there is not much point to it. Maybe the vacuum pump is bad?
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Vladimir. '98 S70 base, 5-speed manual - his, '93 945 - hers
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