I have a quesiton for people who know what to look for when the check engine light on my 745 comes on sometimes not always and turns off once it is put into gear and you start moving. I have noticed that it comes on and lingers a while then cuts off.
Please let me know where to check and start to fix the problem. thanks
matthew
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Shooting for 200,000mi! 150k and counting!

if you have an OBD (I think you might be unfortunate and not have it since it is 1989. hard to say.) then you can try pulling the codes.

on the driver's side under the hood near the strut tower, look for a little box about 2 inches long and 1 inch wide with a little cover on it. it should have 1 button and 1 red LED and a little wire (test probe) attached to it. if you have that, you have OBD (onboard diagnostics) and you can retrieve error codes when the check engine light comes on.

the procedure to pull the codes is here:

http://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm

once you get the code, it should help narrow down the problem much more.
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Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'