I have a 93 ford tempo and when i start it after it runs for about 30 secs it starts making this reallt loud air sucking like smog pump type noise from inside the throttle body i cant figure out whats causing this and the car runs at a real high idle even after the tps sensor has been replaced does anyone know what is causing this problem?
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remove gas filler cap.listen at filler while someone turns key to start.you should hear pump 'hum'.if not,check inertia switch [crash switch] behind carpet on left side of trunk.if it 'hums'check fuel filter,it may be clogged.if pump makes no noise,it may require replacement.modern [plastic] fuel pumps will 'self destruct' if ran dry.gas tank must be removed to replace pump.
As far as I know without checking it personally it sounds like it could be one of three things (in order from easiest to hardest). Clogged air filter, worn timing chain, leaking head gasket. To check for the third go to Auto Zone and get them to do a compression check, its free. I can't remember off hand but if the 93 has a TPS (throttle position sensor) that could also cause an irratic idle.
I had experienced the same problem with my 93 TC. I'll try to make it short. Replace the Idle Control Valve. Cost me $50 at AutoZone. It has a electronic plunger that has a rubber o ring on the end of it. It separates two air chambers inside the valve. When the rubber gets old and the plunger is suppose to cut off the air coming in from one chamber to the other, the air gets sucked between the chambers across the old rubber causing the humming noise. That is also why the engines revs up and down and wont idle right. It is located between the firewall and the back of the motor just to the left (drivers side) of the throttle control assembly. When you look up on the internet on how to replace it, it will tell you to remove all the housing surrounding the wiper blade control arms and assembly so that you can access it. If you take your time, just remove some of the hoses and wires connected around it and you can access it without removing all that ****. Only has two screws to it that point up and can be reached with a ratchet and extension. Car runs great now and finally got rid of that noise.
Are you sure it is the water pump, your year had a real problem with the crankshaft pulley coming apart, rattles like crazy, real loud, water pumps don't as a rule make very much noise they just start leaking.
make sure to do a fuel pressure test and the presure should stay at 35 psi even after turning ingition off the pressure must to be at least 25 to 30 psi for a few minutes, if it goes to cero or close to it, after turning ignition on then you might need a neww fuel pump installed on it