As part of my ongoing fuel pressure and hesitation diagnosis, I went to the relays today.

The FAQ (http://www.brickboard.com/FAQ/700-900/ElectricalCircuitsRelays.htm#RelayLocations) diagram says that the relays I pulled are: Injection System, Windows, and Cent-Locking.

The injection system (fuel pump) relay was warm, but not hot. The others were also warm. I yanked all three.

Is that diagram correct though? It strikes me as odd that the windows and cent-locking relays would be warm, especially since those don't operate for a very long time or anything. It's not like I sat there and rolled the windows up and down repeatedly while locking and unlocking the door.

I guess they could be going bad. The bases of them looked to be slightly corroded, but the innards of the relay look ok. I took some fine stool wool and cleaned off the connections.

The "injection system" relay is:
Volvo 989151
Made in Germany
3523608

Appears to be the old style with copper connectors. I might just order a new one for the hell of it.

The one labeled "Cent-locking" is:
Bosch 12V 2x15A
0332015006
I googled it and the first hit it back to FCP Groton which lists it as a lambda relay for a 240 Volvo?? I might order a new one of these too.

The one labeled "window" is:
Volvo
1 259 925-2
6807
031089
89 96 29
12V max 40A

I can get pictures if need be. Thanks!
--
Ken
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'
Click here for the 700/900 FAQ