I have a well maintained 1987 760 turbo wagon. Wiring harnesses have been replaced and it always runs well and has been recently tuned. Last week some unusual things began happening. To start with the rear wiper would just come on for one swipe every few moments ? The car also started hesitating occasionally, sometimes at the same time as the wiper ? When I was at a traffic light it missed and stalled, it never stalls. It started right up and ran ok, but this is strange. I was thinking of checking the grounds ? I have had issues with grounds before. Once the headlight chassis ground was bad and all the headlights came on but were dim. Just looking for some advice and answers. Thanks for the help. I will let you know what I find. Hopefully I won't get stuck.

Mark

My '90 740GLE never stalled, but it did have some stumbling issues.. and it would occasionally refuse to start until it had set for a while.

My issue was one of the two relays that control the injectors. On my car they are mounted on the passenger side..behind the coolant resevoir.

Of those two relays, one was one of the newer non Volvo brands sold today. I bought a replacement.. same brand.. still had issues.

Found an older Volvo relay to match the other, and issues went away. I still have to rebuild the connectors for these relays, as time has made them fall apart within.

Also I will hopefully to pull both soon and have them re-soldered. These older Volvo relays are top notch and just need a bit of work to make them perfect.

Hope this helps, or gives some ideas.
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"Do you think that's air you're breathing now'? (The Matrix 1999) '94 940T (463K+), 92 245 (300K+), 90 740 (148k)

I changed the relay your talking about last year with a NOS Volvo relay. It's called a radio suppression relay. My Volvo was doing the same thing, but I don't think that's the problem this time.