NIGHTMARE MISSFIRE! - Mustang Evolution

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Old 05-02-2011, 10:37 PM   #1
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NIGHTMARE MISSFIRE!

I have an '04 GT that I bought 2 years ago from the dealer, that turns out has a bunch of mods. There is a pulley system installed and for about a year now and after spending about 2K on trying to fix the problem, I was hoping to see if anyone has had this problem before. What happens is at any random point while driving it loses significant engine power and I can feel the whole engine bog for a good 30 seconds all while the check engine light blinks. The codes that are being spewed out are misfire codes for all cylinders, but after changing all the plugs, coils, boots, checking compression on all cylinders, swapping out the whole computer for a new one, I have the same issue... Has anyone else gone through this!? Or can anyone tell me if I'm completely missing what it could be? I don't want to sell this car, and I don't want to keep throwing money at mechanics to not fix the problem. Please HELP!!
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Old 05-02-2011, 10:41 PM   #2
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Does it do it all of the time? Check fuel pressure first. Do you have catalytic converters? You can loosen the bolts before your converters and try it quickly just to test them to see if they are plugged also.
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Old 05-02-2011, 10:42 PM   #3
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Re: NIGHTMARE MISSFIRE!

Has is ever thrown any codes for fuel pressure or anything fuel related? I would check the FRPS (fuel rail pressure sensor), it's located on the fuel rail and has a electrical connector connected to it.

You can take this off and have it tested at any major parts retailer to let you know where to go from there. I had one go out randomly and it would cause major issues, but only for short periods of time. Would get worst the more gas I gave it but be fine 2 or 3 minutes later.
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Old 05-02-2011, 10:44 PM   #4
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Re: NIGHTMARE MISSFIRE!

Yeah, it does it every time I drive it, and I will check to see if they're bolted on, but I have a feeling they're welded.
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Old 05-02-2011, 10:46 PM   #5
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Re: NIGHTMARE MISSFIRE!

That's a good suggestion, I'll give that a shot and see if that sensor is bad.
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Old 05-02-2011, 10:49 PM   #6
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Quote:
Originally Posted by 04silver
Yeah, it does it every time I drive it, and I will check to see if they're bolted on, but I have a feeling they're welded.
Just a thought. Loosen the bolts at the flanges after the manifolds to where they leave a gap. Just take a quick ride down the street. Windows down because carbon monoxide can get in the car. Can't guarantee that this is your problem but I have seen it many times before. P.S. It will be extremely loud.
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Old 05-02-2011, 10:53 PM   #7
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Re: NIGHTMARE MISSFIRE!

Haha sounds like fun!
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Old 05-02-2011, 11:01 PM   #8
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Like lowflyn said. It could very well also be a fuel issue. I would get the fuel pressure checked before I did anything.
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Old 05-03-2011, 10:32 AM   #9
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Re: NIGHTMARE MISSFIRE!

I know you said you changed coils, but you did check that they are working well, right? because that sounds like a problem i was having, and it resulted to be in the ignition coil, i t wasn't sending enough juice to some plugs.
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Old 05-03-2011, 10:38 AM   #10
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Re: NIGHTMARE MISSFIRE!

sounds more like a fuel issue good luck man.
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Old 05-03-2011, 11:09 AM   #11
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Re: NIGHTMARE MISSFIRE!

if they changed the pulleys they may have changed the harmonic balancer, it wouldnt just do it now and again but make SURE its on tight and to spec. if it slides out a bit it can throw all kinds of misfire codes etc as the sensor ring wont line up to the crank sensor.
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Old 05-03-2011, 11:45 AM   #12
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Re: NIGHTMARE MISSFIRE!

That sounds like a lot of work, do you think the dealer would charge me an arm and a leg to get the the harmonic balancer checked out?
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