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Old 10-28-2009, 09:11   #1 (permalink)
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99 Taurus - Engine Light Rough Idle

My wife was driving our 99 Taurus 3.0 OHV last weekend when the engine light came on and the car started to run rough. The idle is really rough and it feels like it will stall. She also thinks she smells burning rubber and thinks it's the belt, but I can't imagine that anything wrong with the belt could cause a rough idle.

It runs the same as when we leave it for a few days without starting except it doesn't go away after a few minutes.

Is there a way to read the engine light codes without a scanner? I know on my 00 Maxima there is an LED on the cpu that flashes and tells you the code.

Other than going to a shop and paying for them to use the scanner, I'll start with a tune up, plugs & fuel filter.

We've had it for a year and I haven't done anything towards a tune up, but I did replace the thermostat, waterpump, & radator cap a few months ago.

Thanks for your help.
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Old 10-28-2009, 09:17   #2 (permalink)
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Re: 99 Taurus - Engine Light Rough Idle

Take it to an Autozone. They check the codes for free.
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Old 10-28-2009, 09:30   #3 (permalink)
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Re: 99 Taurus - Engine Light Rough Idle

Awesome! Thanks! Atleast I'll have somewhere to start with.
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Old 10-28-2009, 10:06   #4 (permalink)
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Re: 99 Taurus - Engine Light Rough Idle

check your vaccum hoses, partic the one running from the pcv to the TB
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Old 11-09-2009, 10:36   #5 (permalink)
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Re: 99 Taurus - Engine Light Rough Idle

Quote:
Originally Posted by rtg143 View Post
Take it to an Autozone. They check the codes for free.
FYI at least in the state of California, parts stores are no longer allowed to pull engine codes with a scanner. They do offer one for purchase for $59.99.

Pep Boys service center did pull the code for free. They do charge for diagnostic, but if you have the manual with the codes, it's easy enough.

So the codes where:

Misfire detected on cylinder #5
Fuel too lean

So I'm going to check #5 and inspect the plug & wire. I'll just replace all the plugs anyway. And for the first step with running lean my diagnosis would be dirt fuel injector, and maybe this is why the plug may have been fouled? So I'll run a fuel injector cleaner through and see what happens.
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Old 11-09-2009, 12:17   #6 (permalink)
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Re: 99 Taurus - Engine Light Rough Idle

Check the ohms in the wire, They should be around 5k ohm. per ft. Keep us posted.
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Old 01-21-2010, 17:13   #7 (permalink)
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Re: 99 Taurus - Engine Light Rough Idle

So I got around to replacing plugs and wires and it still ran the same.

Now I have determined that one of the head gaskets is blown, and I believe that is the reason for the cylinder #5 misfire. It ran out of coolant after I noticed a lot of white smoke out the exhaust long with what I think was a ton of water.

So I'm ordering a head gasket set & head bolts tonight for a long weekend...
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Old 01-21-2010, 17:26   #8 (permalink)
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Re: 99 Taurus - Engine Light Rough Idle

That's too bad. But at least you know how to do it yourself. Have you done a compression check? They also are prone to have coils go bad. Keep us posted.
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Old 01-22-2010, 11:55   #9 (permalink)
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Re: 99 Taurus - Engine Light Rough Idle

Had the exact same problem with my 98 Taurus and I thought for sure all my vacuum hoses were good but took it in finally and they found a 6 inch long thick u shaped vacuum hose with a hole in it. My enngine light came on the same day that started but the light was for the Torque Converter so both were causing the problem. But as a fix before I could afford to take it to the shop I disconnected the MAF and IAC and it evened out the idle, but I wouldnt suggest running it for more than a few days because you lose alot of data, but it works in a pinch.
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Old 01-22-2010, 15:46   #10 (permalink)
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Re: 99 Taurus - Engine Light Rough Idle

Go very carefully and check the heads. You might want to order new ones also.
Cast iron doesn't usually move when over heated. Aluminum will. I'd suggest you send them out and have then checked or you might find out you just threw away a lot of money when the new head gaskest blow again in a week. Be carefull and good luck.
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