Question about 1994 Ford Thunderbird

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Trouble shooting for thunderbird sc

Has gas and spark but doesnt start

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The most common problem for engines not starting could be a weak battery. Is your battery fully charged/not old? All batteries are rated for a certain lifespan, varying from three to five years. If it's been past that since the battery was replaced, it could be that your battery isn't holding enough charge anymore. You could check this by jumpstarting the car. If your car starts while connected to somebody else's battery, then you know battery isn't providing quite enough power.

If your engine is getting enough power from the battery though, it's possible that it's not sparking correctly. When was the last time the spark plugs and wires were replaced? If it's been more than two or three years, they can begin to grow faulty. Spark plugs get replaced when you bring your car in for a tune-up.

Otherwise, it could be that the engine isn't receiving enough air, or enough fuel. If the air filter is extremely dirty and clogged, it's possible that there's not enough air reaching the engine. But for that to happen, the air filter must be really quite dirty. Has the air filter been replaced lately? For most cars replacing an air filter is really easy to do, it generally only takes a screwdriver, five or ten minutes, and $15 for a new filter.

The other possibility is a bad fuel pump, which makes it hard for the car to deliver fuel from the tank to the engine. Since your car is a 1994, it's possible that the fuel pump has been growing faulty. I had a 1997 vehicle with a starting problem where getting a new fuel pump solved the problem. If you take it into a shop to replace the fuel pump, make sure they change the fuel filter too.

It's possible, though I'd say less likely, that your starter is getting old, and that it's not cranking as well as it used to. If it's not cranking fast enough, the engine won't catch and start.

Starting problems are always annoying and may be caused by different problems. One unusual one I've encountered is that the keyhole was wearing out. You start a car by inserting and turning the key, and when you release the key the car is supposed to keep running, but in this case, if the key was released to far by a millimeter or two, the engine died. The keyhole was wearing out. Who knows? Perhaps you might solve your problem just by fiddling with the key a little bit. Remove it and then reinsert it several times and try again.

Posted on Dec 05, 2012


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SOURCE: 1990 Ford Thunderbird SC with three trouble codes

Trouble Code 13 indicates that the exhaust stream oxygen content sensor (O2 sensor) is not responding as expected. When cold, the sensor is 'biased' by the ECM to about 450 millivolts. Before it warms to at least 600 deg F (315 deg C) it acts as an open circuit and when the ECM reads it, it reads the 450 mV bias. The ECM expects the sensor to warm in a short period of time and begin sending its own voltages.
The link above is for code 74-77.

Posted on Feb 18, 2010

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