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I have had two cars which had a problem with this relay. It is black, usually on the passenger side by the anti-freeze expansion tank. The part number is 1323592-1.
A 740 had poor acceleration and hard cold weather starting here in Minnesota. The problem did not change with a L-engine out of a 1993 940 (non-turbo). Changing the relay made a huge difference in both acceleration and cold weather starting. The reason I put in an L-engine is because the old K-engine froze with a broken intake valve. I have always wondered whether the relay, which supplies a ground to the fuel injection, could have had high resistance contacts leading to the injectors not injecting a rich enough mixture so the engine ran lean? Any comments on the broken intake valve and if the relay could cause this?
The second case of this relay going bad was fixed two nights ago. My 1995 940 (non-turbo) with 69K miles had poor acceleration and would surge slightly running steady. I thought the problem could be related to the years in storage even though I started it periodically and had a full tank of gas with stabilizer. I changed fuel filter, cleaned the IAC and throttle bottle, checked fuel pressure and volume and could not find anything wrong. Then I changed the relay and again, it was like a different car.
I am writing this post to possibly help out anyone that has similar problems with poor acceleration, etc. The brickboard has certainly been a great resource to me for years!
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