I will try to explain the problem to the best of my ability.
My car is using extreme about amounts of gas. In 2 days I had to fill up twice. I have chnaged the oil and filter, spark plugs and replaced the Air Mas Flow Sensor. No oil leaks.
What things should I check out at the mechanics or Is this the nature of the beast a 1990 Volvo 740 Gle non-turbo 16 valve DOHC
We have the same car, i would have a mechanic check the ECU. thats the first step in finding out what is wrong and why its burning so mutch fuel. it could also be your air filter, but then agian, you wouldnt be burning a tank of gas a day. well hope you get it fixed.
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it aint got a tensioner pulley,its the alternator that keeps the tension...undo the bolts,slide it towards the block then fix the belt over the pulleys,pull the alt out and lever it out until belt is tight,1/2"play on longest part of belt between pulleys.is fine.....
Hmmm...I don't think the clearance on your16v engine are that much different than the 8 valve models. On them, all you do is loosen the passenger side engine mount and jack the motor up. Be sure to use a block of wood so you don't bend anything. If you have access to a hoist or can build a support to use a come-along to winch it up it makes things much easier. If fo some reason one does have to loosen the steering yoke, the couplers are down where it attaches to the cross member. There is a pinch bolt you loosen and then it will slide.
If you're losing enough oil in 45 minutes that the oil light comes on or the engine begins rattling, you have more to contend with than an oil pan gasket. OP gaskets drip, not pour. I've installed a pan w/ no gasket and not had the severity of oil loss you describe.
sounds like you have a computer glitch. i would take it to any auto shop and pay 50 bucks so they can take a look at your e.c.u. (engine control unit) we had a similar problem a few years ago with our 1990 volvo 740 gle 2.3l station wagon. it was a glitch with the computer. got a mixed signal with the mass air flow sensor.
May I suggest a locking gas cap. You could put a large piece of cardboard under your car and if there are any drops the next morning that smell like gasoline you might find the leak if there is one.