2001 ford taurus was over heating so i replaced the thermostat. well then it started running cold and wouldnt heat up and i was getting air up through the coolant resevoir. so i replaced the watrer pump. now it is dieseling and then smoothing out and i am getting smoke from the exhaust. it almost sounds like marbles bouncing around in the engine but it only does it for short periods of time then it smoothes out.

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Check the heater plugs normaly when the engine is cold heater plugs work to heat up combustion chamber then starts easy,also long raning fuel filter mybe so change the fuel filter.

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try to run the water pump without hoses, and add water in the 'in' side, if is powers out the other side, then it's fine. how is your water/coolant mix?

SOURCE: heater blows cold air have replaced the thermostat

sounds like the controller went bad use temp checker see what your temp is at inlet of heater core from hose

Mike Butler

• 6674 Answers
• Posted on Dec 24, 2009

SOURCE: My 2001 ford Taurus heating temp gauge is not

Start the engine when cool, remove rad cap and start engine and let it run with the heater on. (not defrost) Top up coolant as needed in rad, and let it run until either the rad fan comes on and off 2 or 3 times, or you can see increased flow in rad from thermostat opening. It will obviously happen after it reaches operating temperature, so watch after gauge gets close to there. Wait until you see that flow 2 or 3 times or fan comes on and off before you put cap on, and fill return bottle to proper level as well. That should cure it, by getting air out of system, and coolant flowing through heater core.

Steve Allison

• 5569 Answers
• Posted on Apr 28, 2010

SOURCE: 1.5 L. single overhead cam

This could be bearing (rod or crankshaft) rattle or a rod cap that is coming loose- I lost one engine thinking it was only an exhaust line hitting somewhere. You might try (using appropriate caution around moving parts) using a long screwdriver with the blade touching various points along the cam shaft cover or the block itself and placing the handle end on or behind your ear. One can often locate the area of the noise fairly accurately.
Modern engine analyzer can often diagnose such a sound and it might be worth a few bucks to have it analyzed before it becomes a death rattle.
BTW, we have 3 vehicles, not counting our kids' various junkers, and each time a new one enters the stables, we buy the Haynes service manual for it; for the few dollars, they can help avoid unnecessary trips to a service shop and give you an idea why the labor costs are so high (if they are.)
Hyundai '91 Accent