Accelerating issues - Mustang Evolution

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Old 04-18-2013, 11:49 AM   #1
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Accelerating issues

I've posted about having issues with my car before, with the idle and everything but I've tried a few things that people have recommended. Just to recap Im experiencing a bouncing idle as I come to a stop. I replaced the throttle body with another brand new stock one. It's still doing it. Once it's completely stopped, it stays right where it should. Also, I've got the 93 race tune from bama and it used to "jump out" when I'd start in 1st gear. The throttle response used to be way better especially in first gear. Even before replacing the throttle body, it'd have a bouncing idle, but the response was better. Also, my car will at times not accelerate as quickly as it should. Almost like the clutch is slipping, which I thought it could be, but then there are times when it pulls really nicely. In my opinion, it's either fuel system related, spark plug related, vacuum related, or throttle body related. I'm going to try replacing the spark plugs, and fuel filter, but does anyone have any other suggestions? Like I said I tried cleaning the MAF sensor, I tried adjusting the cai to see if I had any leaks, but I got nothing. Everything is as tight as it should and could be. Thanks for any input.
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Old 04-18-2013, 12:14 PM   #2
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Yikes! I've never heard of people having this problem before? This is gonna be a toughie!
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Old 04-18-2013, 02:14 PM   #3
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Have you tried taking it back to stock, drive it a little, then put the tune back in or try a different tune. If it's the tune then Bama should be able to take care it. Can you data log? That would help them determine exactly what the problem is.
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Old 04-18-2013, 02:46 PM   #4
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I did put it back to stock, and then tuned it to 93 again but the throttle response feels stock. How do I data log? Use my sct tuner?
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Old 04-18-2013, 02:51 PM   #5
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Replace your idle air control valve.
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Old 04-18-2013, 02:56 PM   #6
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I had a similar issue in my Nissan I used to own. Ended up being a idle sensor or some crap. Aggravating as hell.
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Old 04-18-2013, 02:58 PM   #7
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How do you replace the idle air control valve?
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Old 04-18-2013, 04:08 PM   #8
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Quote:
Originally Posted by eouellette18 View Post
I did put it back to stock, and then tuned it to 93 again but the throttle response feels stock. How do I data log? Use my sct tuner?
You can data log with the SCT tuner hooked up, best to have someone with you to help. You can save the file and then upload to your computer. I think you can only do 1 at a time this way. If you have a laptop, you can hook the SCT to the laptop (really need a friend for this) and then drive it certain speeds and certain ways (ie do several launches or drive a steady 60 mph), then save each file after you're done. Afterwards you can upload the files to Bama and they can analyze the car's behavior in conjunction with the tune.
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Old 04-18-2013, 04:09 PM   #9
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It almost feels like the pedal and the actual throttle are "disconnected" at times.
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Old 04-18-2013, 04:15 PM   #10
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Quote:
Originally Posted by eouellette18 View Post
It almost feels like the pedal and the actual throttle are "disconnected" at times.
It might be tune related, these cars do have "drive by wire"
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Old 04-18-2013, 05:13 PM   #11
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That's what I think. If I were to clean the wire connectors for where the tps and iac terminals are, would that help. The ends had some dirt on them. Would a custom tune from somewhere take care if this or at least be able to tell me what's wrong?
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Old 04-18-2013, 10:37 PM   #12
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Bump
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Old 04-22-2013, 08:56 PM   #13
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Traction control acting up?
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Old 04-23-2013, 08:42 AM   #14
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It does the same thing even when I turn the tc off.
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