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smsable

2003 Mercury Sable Random Misfires?

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I have a 2003 Mercury Sable and from time to time it randomly misfires. What is a common cause of this does anyone know?

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I have a 2003 Mercury Sable and from time to time it randomly misfires. What is a common cause of this does anyone know?

Start with the basics... plugs, wires, fuel filter, lucas injector cleaner...

Most of these are maintenance items :)

------

Seriously though, does it pull any codes? You can head to most auto parts stores and they'll read the codes for free -- write them down and post them right here.

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I have a 2003 Mercury Sable and from time to time it randomly misfires. What is a common cause of this does anyone know?

It pulls a check engine code but it's only a random misfire code i don't recall the code # but if it was more than just a random thing then i would assume the common tune up stuff to but it's not. it happens about once every 2 months and if you reset the code it will happen again in another 2 months. it really depends on the weather to it seems if it's extremely hot or cold that seems to be when it happens. i thought maybe MAP Sensor but the guy i bought it from said he just replaced it.

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It pulls a check engine code but it's only a random misfire code i don't recall the code # but if it was more than just a random thing then i would assume the common tune up stuff to but it's not. it happens about once every 2 months and if you reset the code it will happen again in another 2 months. it really depends on the weather to it seems if it's extremely hot or cold that seems to be when it happens. i thought maybe MAP Sensor but the guy i bought it from said he just replaced it.

Sounds like my 97 Taurus...it ended up being a bad coil pack, but it could be a leaking injector, O2 sensor, vacuum hose, or any number of other weird things.

What has been done so far?

Edited by machausta

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I am on my third coil pack, same engine. If plugs and wires are good, (and not cheap afternarket junk,) pull the coil pack off and check for cracks. They are known to fail.

Good luck, and welcome to the :tsoc:

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The only thing i haven't checked is the coil packs but i wouldn't have figured a coil pack would cause random misfires. I would have figured either they work or they don't. but thanks I will check them out. Thanks for the welcome. I appreciate everyones help.

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The only thing i haven't checked is the coil packs but i wouldn't have figured a coil pack would cause random misfires. I would have figured either they work or they don't. but thanks I will check them out. Thanks for the welcome. I appreciate everyones help.

There is only one on that car, it's back between the motor and the firewall. Easiest way that I know of to get to it is by removing the cowling on the passenger side. Still kind of a tight fit, but not too bad.

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I have a 2003 Mercury Sable and from time to time it randomly misfires. What is a common cause of this does anyone know?

http://www.taurusowners.com/topic/4047-plug-wires/page__pid__52922#entry52922

See my experience.

I replaced the coil pack, cam pos sensor, crank pos sensor, all vacuum lines, PCV and hose and traded IAC from my other Sable.

Did air filter, fuel filter and such.

Did have code but it was for misfire in first 1K revolutions.

In my case the plugs were only about 15K miles and double platinum.

Your case might be different but after the usual vacuum leaks and maintenance, I would check the wires and plugs.

Best of luck and get back to us.

-chart-

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A random misfire would show as a P0300.

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There is only one on that car, it's back between the motor and the firewall. Easiest way that I know of to get to it is by removing the cowling on the passenger side. Still kind of a tight fit, but not too bad.

Thanks again guys. I guess I'll dive in a little deeper into it this week when I'm off work.

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There is only one on that car, it's back between the motor and the firewall. Easiest way that I know of to get to it is by removing the cowling on the passenger side. Still kind of a tight fit, but not too bad.

Rusty

I would take the intake off. It is not that big of job and it has some advantages.

The wire layout and trim is important.

The bolts are Torx and rust in place. I got a used one from the JY from an engine out of the car and the bolts were really tight.

I had to use a rachet with torx adapter to get them loose.

The one on my car was not factory so the bolts had been out before.

I took this pic so as to get the wire layout right and not loose my place.

There is also that black box capacitor that goes under the back screw.

In fact, if I was into that, I would take one plug wire at a time and ohm each. Expect 2-5K ohms per foot. They will either be in that range, or will be open circuit.

I would also use a flashlight and look inside the boot for the metal connector to be corroded or OK.

Picture is worth a thousand words.

Just my take.

-chart-

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Not one of Ford's better designs on the 96-99, 01-03 Tauruses w/dohc. Why would you put the coil pack at the hottest point of the engine bay. Durrrrrrrrrrrrrrrrrrrrrrrrrrr.................

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