Troubleshoot Why My 1994 Ford Taurus Won't Commencement
When troubleshooting a no-start case on a 1994 Ford Taurus, the anterior protest is to isolate the ground for a no-start to a particular universe or action. To pace, the Taurus needs To possess a agreeable battery and starter to turn the engine over. Provided the engine turns over, the engine needs fuel, ignition with the Correct timing and sufficient compression. Eliminate any one of these and a no-start dispute exists.
Instructions
1. Lick to begin the motorcar. The instrument lights should glassy up. Whether the engine fails to turn when the starter is busy, something is askew with the starter course. Lift the hood and hook the voltmeter to the battery by connecting the cherry edge to the concrete terminal and the inklike front to the detrimental. The reading should manifest 12.5 volts or improved. Provided not, charge the battery and probation the voltage again. Provided the voltage remains low, the battery needs to be replaced. Provided the voltage came up to 12.5 or more advantageous and the motorcar starts, Stare at the exhibit on the voltmeter with the engine running. The voltage should expo a minimum of 13.8 volts to 14.5 volts provided the alternator is functioning properly. Whether not, change the alternator.
2. Proof the starter for problems. Whether the battery tests ace and the van Testament not alpha, probation the terminals on the battery for corrosion and looseness. Stare at the leading confident wire from the conclusive terminal to the starter and peep whether there is any exposed corrosion or breaks--replace as binding. Connect the jet facade on the voltmeter to the denial terminal on the battery. Capitalization the claret edge to probe the brick worthy wire connexion at the starter solenoid. The wire is great provided the voltmeter reads 12 volts. Provided the voltmeter does not interpret 12 volts, exchange the wire.
3. Disconnect the inconsequential wire on the solenoid located on the S terminal. Probe the microscopic wire location with the claret guidance on the voltmeter while an assistant holds the solution in the inauguration position. There should be 12 volts as drawn out as the principal is in the dawn position. Whether there is voltage when the solution is in the commence position, the starter is wick.6. Pull one of the spark plug wires off the plug and insert a spare spark plug into the end of the wire. Lay the spark plug against a good ground, such as the exhaust manifold, intake manifold bolts or accessories. If both show power at the appropriate time, the relay is bad. If there is no momentary power with the key in the start position, replace the ignition switch.
4. Look for engine management problems. Determine if the check engine light is on. Connect a code scanner to the OBD port located on the left lower side of the steering column under the dash. Turn the scanner on and press the key marked "Read." Reference the code displayed on the scanner to the sheet supplied with it. The problem will be indicated there.
5. Check to see if the fuel pump is operating by having a helper turn the key on and off for three seconds, then back on while you listen to the fuel pump. The fuel pump on a Taurus only operates for two seconds at a time when the key is turned on, unless the computer senses the engine is trying to begin or has started. An audible "errrr" should be heard. If no sound is heard, the pump is not operating, hence the problem. To confirm the diagnosis, walk around to the engine and locate the Schrader valve on the fuel rail. Remove the cap from the valve. Using the small pocket screwdriver, push the Schrader valve in and hold it. Have your assistant turn the key to begin. Get ready to release the Schrader valve because turning the key on will pressurize the fuel line; and if the pump is working, fuel will spray out of the valve. If there is no spray, the pump is not working. Check the fuel pump fuse in the fuse block under the hood. If it is good, replace the fuel pump. If there is fuel, the next check is for ignition.
Whether there is no gift (voltage), evaluation the starter fuse in the fuse block under the hood. Whether the fuse is admirable, check the starter relay by pulling it out of its socket. Use the red lead from the voltmeter to probe the vacant relay terminals. Voltage should be present at one terminal with the key off; another one should show power when the key is in the start position only. Have your helper turn the engine over, with the key in the start position and watch for a good spark at the spark plug gap. If there is no spark, the ignition system is at fault and must be inspected. If there is a spark, the timing or compression must be the problem. To reiterate, if you have fuel, spark and air, you will have bang--a mechanic's term for ignition. In order for this ignition to effectively produce power, compression must be present. Several factors can cause lack of compression; and if this is the case, the factors need to be isolated independently.
7. Remove the spark plugs with the spark plug socket. Install the compression tester in each cylinder in succession, crank the engine for five revolutions then check the reading. Each cylinder must have 85 pounds per square inch plus; and when comparing all cylinders, they must be within 10 percent of one another, or the engine will run rough. If the compression is less than 85 pounds, an internal engine problem exists and needs to be addressed.
