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Old 09-05-2010, 08:01 AM   #1
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The winner gets a prize!

Hey guys, Need some help here. Just bought my first mustang two weeks ago. Shes a '02 sixer convertable with 38k miles. Always stored with a cover over her and indoors to boot so she looks great still. Didn't notice any issues during the test drive other than you feel every bump in the road through the suspension.

So the day after I bought it, I noticed that while accelerating through 30-45 mph it started jerking/surging. Felt like a really bad transmission shutter. Mechanic swore up and down that it was something simple so I replaced plugs and wires with the premium stuff, swapped the air filter and fuel filter, and had my mechanic clean the throttle body and air flow sensor. That helped it to an extent (took it from about a 10 to a 7 on a 0-10 scale). She idled much better though.

My mechanic still swore it wasn't trany related. He checked some engine codes (though no lights on) and found the EGR valve pressure sensor was out of spec. He swapped that out and it seemed to fix the issue! I was thrilled! Drove it around that night and it was fine. Then I went and put gas in it (speedway 87 octane), got a block down the road and BAM it starts it all up again. It started shuttering really hard during acceleration at the speeds listed above. My mechanic was stumped. It sounded like he had lost his patience for the issue and didn't want me to bring it back.

So now I'm trying to figure out what to try next. The mechanic said that driving it wont hurt it, just annoy the hell outta me. I put 5 gallons of 93 octane (BP brand) in it last night and it seems to have calmed the issue for the time being.

Any ideas? And what grade of gas do most people run in the V6 models?

Thanks for all your help fellas!
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Old 09-05-2010, 03:40 PM   #2
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Re: The winner gets a prize!

I use 87 octane, but I only buy it from Shell. Any other gas and my car starts acting up when I throttle up. Weird. Do you still have the stock air box on?
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Old 09-05-2010, 04:06 PM   #3
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Re: The winner gets a prize!

Yes, the engine is entirely stock right now.
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Old 09-05-2010, 04:21 PM   #4
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Re: The winner gets a prize!

I think it might be an air-fuel mixture issue. Check all of your connections make sure they all clean, and maybe try some sea foam.
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Old 09-05-2010, 11:30 PM   #5
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Re: The winner gets a prize!

coil pack? a miss can feel much like a trans slipping
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Old 09-06-2010, 06:59 AM   #6
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Re: The winner gets a prize!

this is gonna sound weird but my mom's stang did that too (an 04 v6). ended up she bent one of the teeth on the crank which was causing it to skip, check that possibility
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Old 09-06-2010, 08:41 PM   #7
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Re: The winner gets a prize!

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Originally Posted by SpectorV View Post
coil pack? a miss can feel much like a trans slipping

^ I'd be willing to bet money that a coil pack would be to blame! My Mom has had several go in her Lincoln Aviator which seems to exhibit almost the same symptoms. It should by now read out. Her light didn't come in, but I plugged it in and it said cyl X misfire.
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Old 09-07-2010, 12:05 AM   #8
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Re: The winner gets a prize!

The coil pack idea is intriguing but I just got it back from my mechanic who had it hooked up to a scanner. He tracked down the EGR pressure sensor but didnt say anything about any other codes. But its worth a shot! I'm making calls to take it in in the morning. I'll keep ya posted.

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Old 09-07-2010, 07:54 AM   #9
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Re: The winner gets a prize!

Good luck. Let us know what it is so we can fix our's if it happens.
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Old 09-07-2010, 08:24 AM   #10
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Re: The winner gets a prize!

Great way to get views by the way. Saying there is a prize lured me in like rotten meat to a catfish. (great analogy right?)
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Old 09-07-2010, 12:30 PM   #11
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Re: The winner gets a prize!

I thought it was rotten meat for allegators
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Old 09-07-2010, 01:27 PM   #12
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Re: The winner gets a prize!

What ever it is. This thread is like rotten meat.
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Old 09-07-2010, 03:09 PM   #13
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Re: The winner gets a prize!

I'm going to say coil pack also. I highly doubt that the pressure sensor is the issue.
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Old 09-07-2010, 08:23 PM   #14
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Re: The winner gets a prize!

I'm still trying to figure out what the hell an "allegator" is
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Old 09-14-2010, 07:38 PM   #15
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Re: The winner gets a prize!

I googled it and i think it is a artist that likes drawing porn. :O
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Old 09-14-2010, 07:52 PM   #16
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Re: The winner gets a prize!

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I'm still trying to figure out what the hell an "allegator" is
I think it's a UF drop-out.
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Old 09-14-2010, 08:46 PM   #17
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Re: The winner gets a prize!

I would get mass air flow cleaner and clean the mass air flow unit. Is the check engine light on? If so get me the codes and I will look them up.
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Old 09-17-2010, 12:57 AM   #18
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Re: The winner gets a prize!

Yeah mine acted the same way it was the mass air sensor didn't read any codes for that but I cleaned it and it went away.
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Old 09-21-2010, 10:32 PM   #19
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Re: The winner gets a prize!

Get it fixed yet?
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Old 10-08-2010, 03:19 PM   #20
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Re: The winner gets a prize!

I had a problem like that my mech cleaned the fuel injectors, replaced the fuel filter, and basically cleaned up the engine and it went away. I think something is clogged, ur injection system.Honestly Driving it like that will harm it ur car is saying is sick itll shorten the life if u keep it like that.
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Old 10-08-2010, 03:20 PM   #21
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Re: The winner gets a prize!

Change ur fuel filter it dont cost that much it might be clogged i forgot to mention that how my problem went away
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