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Old 03-21-2007, 05:49   #1 (permalink)
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2001 Taurus w/P0300 error code

I have a 2001 Taurus with the standard SOHC 3.0 engine. I had the famed egr sensor (P0402 error code) go bad last year.

When that happened, I had the local dealer do a diagnosis and they listed a ton of things that needed changing (110,000 miles). I changed the egr sensor, but ended up with a generic that didn't have the same voltage range and had to get one directly from the dealer. This fixed P0402.

However, in the process, I replaced the plugs, the wire and the idle air control valve. Now, the car idles poorly and sometimes stalls at idle - especially at redlights or when stopping going up a hill. If I let it idle for about 5 minutes or so, I will get a P0300 (random misfire) that disappears if I drive the car around. I switched all of the items back to the original ones and that didn't help, so I put the new items back in/on.

Can anyone offer a suggestion? Why would the idle start acting up all of a sudden after changing the plugs, wires, and idle air control valve and not work well when I put all of the old items back in?

Oh yeah, I almost forgot, I have also replaced the mass air flow sensor.
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Old 03-21-2007, 06:38   #2 (permalink)
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Exclamation Re: 2001 Taurus w/P0300 error code

Quote:
Originally Posted by texfrazer
I have a 2001 Taurus with the standard SOHC 3.0 engine. I had the famed egr sensor (P0402 error code) go bad last year.

When that happened, I had the local dealer do a diagnosis and they listed a ton of things that needed changing (110,000 miles). I changed the egr sensor, but ended up with a generic that didn't have the same voltage range and had to get one directly from the dealer. This fixed P0402.

However, in the process, I replaced the plugs, the wire and the idle air control valve. Now, the car idles poorly and sometimes stalls at idle - especially at redlights or when stopping going up a hill. If I let it idle for about 5 minutes or so, I will get a P0300 (random misfire) that disappears if I drive the car around. I switched all of the items back to the original ones and that didn't help, so I put the new items back in/on.

Can anyone offer a suggestion? Why would the idle start acting up all of a sudden after changing the plugs, wires, and idle air control valve and not work well when I put all of the old items back in?

Oh yeah, I almost forgot, I have also replaced the mass air flow sensor.
Why did it need a IAC valve??? Sounds to me at the very least you have a dirty throttle body for the stalling stopping. For the P 0300, where you replaced the plugs and wires, the next thing to check is the fuel pressure. Too high a pressure will cause a misfire as well as to low a pressure. The next things after that is checking the cylinders for leakage with a leakdown tester. I fully detailed misfire diagnosis a while back on another post so dig around and you will find it.
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Old 03-21-2007, 06:47   #3 (permalink)
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Re: 2001 Taurus w/P0300 error code

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Originally Posted by tbird100636
Why did it need a IAC valve???
The dealer said that it was dirty and needed replacing.

I will find your previous post and work on those solutions.

As a note, what is really weird is that it seems to be getting slightly better over time. It has only stalled once in the past few days - but it is still a rough idle.
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Old 03-29-2007, 02:40   #4 (permalink)
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Re: 2001 Taurus w/P0300 error code

Check the spark plug wiring. Make sure the plug wires did not get switched and are causing a misfire.
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Old 03-29-2007, 05:49   #5 (permalink)
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Re: 2001 Taurus w/P0300 error code

I know from experience how hard it is to get to the back 3 cylinders along the firewall. In the process of replacing these parts you could have inadvertently damaged a wire or vacuum hose. Check the engine areas you worked in, leaned on, set things on, etc. Also try to correct the most easily reproducible problem. In this case it might be your rough idle. That may fix a number of other issues, or at least narrow down their cause.

Go to Ford CD/DVDs download your model year's ISO, burn to CD, install and see if you can find back-probe sensors voltages and resistances that might be a problem, including the ones you just replaced.

It may take a while to get to the bottom of this, so hang in there. Drive-ability problems, as the call them, such as this, are notoriously difficult to diagnose and solve.
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Old 04-02-2007, 07:18   #6 (permalink)
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Re: 2001 Taurus w/P0300 error code

Thanks for the continued help! I am still working on the issue. I have re-checked all of the plug wires and they are all correct. Now I'm working on pulling the back row of spark plugs and re-checking them. I'll post when I have put all of this back together.

Thanks again - also working on downloading the appropriate manual as referenced by dac122.
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