Question about 2001 Ford Mustang

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HELP Mustang engine power loss, rough idle, engine shake

My 01' automatic v6 started making a little noise months ago which slowly got worse, turned out to be exhaust leak right before the flange on the exhaust manifold. The small leak eventually turned into the whole pipe off the flange and a rediculously loud noice. The day after the pipe came off I had been driving for about 5 minutes and suddenly it started to run horribly: huge loss of power, delayed/weak response to gas pedal, trouble changing gears a couple times, whole car shakes when idle in any gear, also after coming to a stop or reving it then letting it idle the engine will start to sputter and sound like its going to shut off. The same time it suddenly started running that bad the check engine light started blinking. Diagnostics came up with code p1401, I figured it was from the exhaust manifold being broken. I have just replaced the manifold and the noise from the exhaust leak is gone, but all the other problems are still there. So i replaced the spark plugs and spark plug wires, also the fuel filter, about a month ago when it was still running ok i replaced the egr vlave. The only mod on the car is a K&N CAI, i've had it on for about a year and a half.
ANY help diagnosing what is wrong with it and what to do would be a huge help!

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  • chrisbowie21 May 10, 2010

    Im not sure how to find out if the valve is burnt or not? tomorrow im going to post a video, hopefully it helps identify the problem

  • chrisbowie21 May 11, 2010

    So I did a compression test and turns out #6 has none. im not sure where to go from here any advice?

  • chrisbowie21 May 11, 2010

    So i did a compression test and turns out #6 has no compression. All the others were the same, it was on the other side of the motor that the exhaust leak was tho. Any advice what to do from here?



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I'm wondering if you could have a burnt exhaust valve cause by the exhaust leak in the cylinder where the exhaust leak was.

Posted on May 10, 2010

  • James Milzheimer
    James Milzheimer May 10, 2010

    My bad, I should have included that. You'll need to do a compression test on that cylinder and a few others to compare to that one. The compression tester screws in where the spark plug goes, crank over the motor and see what the gauge reads, if it's 0 you probably have a burnt valve.

  • James Milzheimer
    James Milzheimer May 11, 2010

    Wow! That's odd that it would be on the other side. Well you'll need to pull that head and see what's going on with that cylinder.


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It's the coil pack. Just had the exact same problem and fixed the exact same thinvs you did. Coil pack usuallt wont throw a misfire code or code at all. Until it's really bad.

Posted on May 17, 2013


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