GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Magnapacks caused check engine light

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Old 1/16/05 | 02:41 PM
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Yesterday I had my pulleys and cat back Magnapacks installed. The guy did a great job. A half an hour or less my light came on. My SCT tune will be here by Tuesday. This should fix everything. My tuners know about all my mods, so I think I'll be fine.

P.S. She sounds really mean!
Old 1/16/05 | 02:42 PM
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Do you guys think it was the change in back pressure?
Old 1/16/05 | 03:06 PM
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I haven't heard of anyone's car throwing an engine light from axle back exhaust. I have JBA and never had the problem. It would help if you were able to go to Autozone or Orielly's to have them diagnose the trouble code with an OBD-II scanner. Let us know what the code is and maybe we can help. Might not even be the mufflers at all.
Old 1/16/05 | 03:24 PM
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Maybe not but, Remember my are cat back so my pipes have changed as well.
Old 1/16/05 | 03:25 PM
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Still going to Autozone for the code is a good idea.
Old 1/16/05 | 03:41 PM
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Would be a surprise to me if cat backs caused the light to go on...if there is any less back pressure it would be very minimal.
Old 1/16/05 | 04:55 PM
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ive got the same setup and havent had a problem <shrug>
maybe disconnect your battery to reset the light and see if it comes on again?
Old 1/16/05 | 06:15 PM
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Who is the tuner you are using? I have'nt been able to locate a SCT tuner in Las Vegas. This has made me lean towards C&L performance for thier Intake and Diablo Predeator combo. I know the most reffered tunner in LV is at Silverstate Motorsports out at the Speedway and he uses Diablo products. Any info would be much appreciated as choices are always good!
Old 1/16/05 | 07:04 PM
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Justin, didn't you call the guys in Alabama that I sent you a PM with? Monty or Steve from JMS @ 251-957-1907. I got there number from SCT.
Old 1/16/05 | 07:06 PM
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Remember Justin I'm in Vegas also.
Old 1/16/05 | 07:32 PM
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Hey guys I also filled up for my first time and used 91 octane. Could that have caused the light?
Old 1/16/05 | 07:39 PM
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Check your filler cap and make sure it's on tight!
Old 1/16/05 | 08:23 PM
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I forgot that can be a problem.
Old 1/16/05 | 11:43 PM
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Sorry about that Johnny, your first post kinda made it sound like you found someone local. I haven't called JMS yet I will tomorrow. It kinda becomes a whirlwind after you have called a dozen or more tuners! The adventure continues.... B)
Old 1/17/05 | 07:49 AM
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Don't bother filling up with anything other than 87 octane until you get your tune done.

The stock engine was tuned to run on 87. If you put anything higher in your only wasting money. When you have your tune done, you should be able to have them set it up for higher octane.
Old 1/17/05 | 07:53 AM
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I have the magnaflow catback with magnapaks on my car and had them on for a month with no engine light coming on. This only happened after installing the MMR intake kit. I highly doubt the exhaust system has anything to do with it.

Perhaps it is the pulleys that are causing it.

As others have said, no point in running 91 octane without a tune for it. You may be losing HP at this time.
Old 1/17/05 | 08:00 PM
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Well, Ford cleared the light and said it was miss fire. I was happy to hear this and I took off. A mile up the road it came back on and than cleared it self. I drove back and talked with my sevice guy. No light no problem. So I left again. Got to the freeway and there it was again. At this point I guess I will have to drop her off for the night at ford. Anyone know what a miss fire is caused from? I don't think my exhaust or under pulleys are behind this. Thanks for any ideas.
Old 1/17/05 | 08:06 PM
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Most likely a coil pack.
Old 1/17/05 | 08:59 PM
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Man Frank, you signature gets bigger and bigger every minute. You sure are excited about this forum aren't you.
Old 1/17/05 | 10:07 PM
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Originally posted by PONY XPRESS@January 17, 2005, 9:09 PM
Most likely a coil pack.
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