Engine runs, but hesitate/misfire - Mustang Evolution

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Old 01-10-2006, 05:54 PM   #1
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Engine runs, but hesitate/misfire

My 2001 V6 stumbling when accerelate or normal driving mode. About an hour ago, engine waring light(engine service soon) came out and sounds like half of cycyners do not function.

I changed spark pulgs 3 weeks ago because tired to sedure the stumbling issue.

Well, I changed air filter when I changed spark plugs(I might adjusted wrong gap), but only worng spark plug gaps or spark plug wires(which is toching the cycynder head or engine) should not contribute engine warning light, right?


I have never seen engine warning light srarted blinking, then kept on and on while my car was barely drive.

Please feed back your thoght.

I am going to get a Bosh platinum 4 or someting with spark plug wires. I am concerned that it might another issue, fuel filter, head gasket, or entine internal damage.


thank you
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Old 01-11-2006, 12:47 AM   #2
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Re: Engine runs, but hesitate/misfire

Don't get Bosch plugs, they suck.

Stick with regular autolite or motorcraft plugs. Make sure the gap is right and all the wires are on the right plugs/coils.
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Old 01-11-2006, 06:54 AM   #3
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Re: Engine runs, but hesitate/misfire

Reset the Computer and have it Relearn the Engine
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Old 01-11-2006, 05:38 PM   #4
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Re: Engine runs, but hesitate/misfire

Sounds to me like you have junk wires. You're def. misfiring. If you go to autozone or O'reilys or someplace you can either rent an OBDII scanner or have it scanned and that will tell you which is misfiring. Make sure all the plug wires are on the plugs tight. look for white discoloration on the wires too. That will tell you if they might be arcing. Make sure they are secure on the Coil too.

The Gap might be the problem but it'd have to be really far out of whack before it'd start making the car run like that.
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Old 01-11-2006, 06:39 PM   #5
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Re: Engine runs, but hesitate/misfire

like was said, don't use bosch. they suck.. use motorcraft or autolite
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Old 01-14-2006, 08:28 AM   #6
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Re: Engine runs, but hesitate/misfire

Something else to check is your intake...mine just jumped off the engine about 5 minutes ago when I was trying to back into my parking spot, car ran like crap. I looked and the intake had jumped off the throttle body.
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Old 01-16-2006, 09:14 AM   #7
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Question Re: Engine runs, but hesitate/misfire

OK. after scanned with DB2 or III, the code indicated #2 spark plug misfire. Then, I replaced "Crank sensor". Well, it bit better running though, there is still misfire dring idling and hesitation during acceralation. Do I need to scan again (or go to the advance auto) or just change O2 sonsor, cam sonsor, ignition component?

During idling, the misfire happen after 2-3 minutes running engine, first 1-2 minutes usually OK.
Hesitation issue: Only occur betwee 1500rmp-2000rpm on high gear, but not low like 1st to second gear. OK my car is 2001 V6 automatic transmission.

thanks for your comment
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Old 01-16-2006, 10:06 AM   #8
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Re: Engine runs, but hesitate/misfire

Cam Sensor is only 30 bucks so I would replace that just to make sure.

As far as the rest the o2 sensor should not be causing a misfire. I would recommend having the codes read somewhere other than an autoparts store because they failed to pick up on my bad cam sensor
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Old 01-16-2006, 10:59 AM   #9
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Re: Engine runs, but hesitate/misfire

you can get teh code ran at autozone for free and they can tell you what it is.
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Old 01-16-2006, 11:01 AM   #10
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Re: Engine runs, but hesitate/misfire

Oh, thanks Brent and folks.
One more little question:
Where the camshaft sensor located at?

I see the drawing on Hayne's manual which show camshft senfor and sycnronizer assembly, but I don't find exact location.
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Old 01-16-2006, 11:11 AM   #11
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Re: Engine runs, but hesitate/misfire

It is at the front of the engine mounted on top of the timing cover. In the picture below I have a arrow pointing to a circle where the CPS is located.
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Old 01-17-2006, 06:30 PM   #12
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Talking Re: Engine runs, but hesitate/misfire

Yea, Woerd,

:thanks:
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