I ran out of gas today in my 1993 BMW e series. I thought the R on the gas gauge meant Reserve tank. Guess not? I just bought it and am trying to figure out all the bells and whistles.
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If the code is accurately reporting the problem, it suggests that your thermostat is stuck open. On your car there are two thermostats. One is under the expansion tank, and I don't know what that one does (I have seen it only in the parts book) and the other is in the usual place, top front of the engine. It comes as a single piece with its cover. A little pricey, but if your car is really running too cold, it is hard on the engine and degrades your gas mileage.
Unfortunately, you cannot rely on the temperature gauge in the dash to tell you if it is really running too cold because the temperature gauge in these cars is non-linear. The needle sets right in the middle of the gauge over a fairly wide range of temperatures.
Hi. Generally, engine temperature will change when you turn on the AC since there are friction added to the engine. If your car goes to overheat then the issue would be the cooling system of the car. You may check these part for your cooling system. First is check the reserve if water/coolant ran out. If liquid rans out to the reserve then the problem could be the hose's or the radiator. Check for holes and possible cuts. Second is cehck the radiator thermostat. It might not functioning well. Third is the water pump, pump might not be working in good condition.
replace fuel pump. you never run out of gas in a BMW...what's wrong with you? It breaks the fuel pump. It's against the BMW code to sit there on the side of the road waiting for bubba and his towtruck and red can of gas. BMW.....come on. you're supposed to have enough money to buy gas. Anyway, the penalty for going against the bmw code of looking like Jed Clampett on the side of the road for gas is: A broken fuel pump.
Those vehicles have to sending units. Your fuel signal is buferred ( calculate) so it takes both signals to make your gauge accurate. sounds like one them is out of range causing your gauge to read icorrect. You do need to take to your nearest BMW shop, so it can be properly diagnose.
I would first check the back pressure of the exhaust system to make sure the system isn't restricted. If the engine is not misfiring, and you have changed the plugs and fuel filter, I would suspect an exhaust restriction. if the exhaust is ok, I would check the fuel pressure next.
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