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Bad Relay? 850 1994

posted by  B.B. on  Sun Feb 23 19:45 CST 2014
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last visit: Mon Oct 6 13:15 CST 2014
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I just looked through my spare parts dept and found two different "103" relays
a green one: Volvo 9434138 / 898769000 fuel-pump controller 4 pin relay
a yellow one: Volvo 9434013 / 898770000 fuel-pump controller 5 pin
maybe the yellow one is for a 740? a puzzle

I have a request that if you do determine that the RSR relay is crap, then you send it to me for an autopsy, I'm thinking a few of the relays should be changed at some point since their failure shuts down the engine.
It might be possible to get a clue about the health of relay points by measuring the points resistance with high precision (with a wheatstone bridge)
I'd expect increasing resistance with wear/age reaching some value where
the higher resistance accelerates the points destruction.
Volvo certainly wasn't expecting a service life of forever with the relays.

This is also a good reason to use old junkyard relays with caution since they
are very likely to be trouble, and may even be the very reason that sent the car to the junky in the first place.

Bill






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New Sudden Fuel Problem - New Pump, Good Relay [850][1994]
posted by  RepairmanJackal subscriber  on Fri Feb 21 15:36 CST 2014 >


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