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Car Forum / Volvo Cars / September 2005Volvo Relays
Mine is a 1991 Station Wagon, 740. 140K miles. I had a no-start several days ago but it has started OK since. I suspected the fuel pump relay so I pulled it and put it back in (presumably cleaning the contacts in the process). The car has been fine since then. But I am worried about certain relays. In the front row, the K relay (central locking?) is too hot to touch; the J relay (window?) is quite hot (but not as hot as K), and the fuel pump relay is quite warm. In Brickboard I have seen two views; "Volvo relays are always hot", the other "A hot relay is a bad relay". Does anyone have any views on this (the others are are only very slightly warm or only ambient temperature)? Thanks, John > Mine is a 1991 Station Wagon, 740. 140K miles. I had a no-start several > days ago but it has started OK since. I suspected the fuel pump relay so I [quoted text clipped - 7 lines] > Does anyone have any views on this (the others are are only very slightly > warm or only ambient temperature)? Dunno what is normal but I don't like hot electricals. I saw a suggestion to drill some small holes in the casing... while it's off. I followed the suggestion with a new fuel pump relay 8 months ago but who knows if it will help? They did say 7 years was about normal lifespan for those (1980 265), which doesn't sound very good - seems something shortens its life. > Dunno what is normal but I don't like hot electricals. I saw a suggestion to > drill some small holes in the casing... while it's off. I followed the > suggestion with a new fuel pump relay 8 months ago but who knows if it will > help? They did say 7 years was about normal lifespan for those (1980 265), > which doesn't sound very good - seems something shortens its life. If it's getting more than just a little warm, you've got a bad connection or excessive load. I failing fuel pump will draw too much power and melt the relay and connector. Also once the connector gets hot it oxidizes which causes resistance and then more heat. I suggest checking the current draw of the fuel pump, if it's pulling more than 10A it's probably worn out. The car is a l991 and it did have fuel problems in 2000. The fuel pump was then replaced and a new relay installed (date code 1999, made in Hungary). I will replace the relays one at a time, starting at the hottest and see what happens. Thanks. >> Mine is a 1991 Station Wagon, 740. 140K miles. I had a no-start several >> days ago but it has started OK since. I suspected the fuel pump relay so [quoted text clipped - 18 lines] > help? They did say 7 years was about normal lifespan for those (1980 265), > which doesn't sound very good - seems something shortens its life. > Mine is a 1991 Station Wagon, 740. 140K miles. I had a no-start several > days ago but it has started OK since. I suspected the fuel pump relay so I [quoted text clipped - 7 lines] > Does anyone have any views on this (the others are are only very slightly > warm or only ambient temperature)? They're made by Bosch and have circuit boards inside. When they get old the solder joints at the connector pins tend to crack and result in an intermittant connection. If you know how to solder or know someone who does, or feel like spending $15 on equipment and a few minutes practicing, it's fairly easy to pop the cover off and resolder them. >> Mine is a 1991 Station Wagon, 740. 140K miles. I had a no-start several >> days ago but it has started OK since. I suspected the fuel pump relay so [quoted text clipped - 16 lines] >or feel like spending $15 on equipment and a few minutes practicing, it's >fairly easy to pop the cover off and resolder them. This is what it can look like: http://www.viatrack.ca/Misc/badcon2.jpg Regards, Boris Mohar Got Knock? - see: Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca Thanks, everyone, for great comments and suggestions. I'll do the resoldering first (I'm well experienced) and will go from there. John >>> Mine is a 1991 Station Wagon, 740. 140K miles. I had a no-start >>> several [quoted text clipped - 31 lines] > Viatrack Printed Circuit Designs (among other things) > http://www.viatrack.ca what a brillant shot thank you > Thanks, everyone, for great comments and suggestions. I'll do the > resoldering first (I'm well experienced) and will go from there. [quoted text clipped - 37 lines] >> Viatrack Printed Circuit Designs (among other things) >> http://www.viatrack.ca >what a brillant shot thank you It was taken with a digital camera held manually against the eyepiece of a microscope. Microscope projects image at infinity so there is no trouble with focusing. Anyone can do it. Regards, Boris Mohar Got Knock? - see: Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca >They're made by Bosch and have circuit boards inside. When they get old the >solder joints at the connector pins tend to crack and result in an >intermittant connection. If you know how to solder or know someone who does, >or feel like spending $15 on equipment and a few minutes practicing, it's >fairly easy to pop the cover off and resolder them. Here's a link on an article I wrote, aimed at beginners, on how to solder: http://w6rec.com/duane/bmw/solder/ __ __ Randy & \ \/ /alerie's \__/olvos '90 245 Estate - '93 965 Estate "Shelby" & "Kate" |
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