Possible Throttle Issue - Mustang Evolution

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Old 05-31-2013, 04:24 PM   #1
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Possible Throttle Issue

Since the wife pulled up outside to pick me up on a trip to the store, the Pony has been acting strange.
When in park or idling it shakes and adds a few revs. Nothing major but enough to be noticeable. No lights have come on. Only happens when in drive or park. So I'm guessing not a transmission or an engine problem.
Any got any idea what's causing this?
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Old 05-31-2013, 04:27 PM   #2
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You might try unhooking the positive connection on the battery for a minute and then hook it back up. Start your car and let it re-learn where it needs to be. Sorry I don't have more info, but heard this helped a few people.
I think the ECU can adjust the throttle for you..
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Old 05-31-2013, 05:02 PM   #3
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Originally Posted by jessesse View Post
You might try unhooking the positive connection on the battery for a minute and then hook it back up. Start your car and let it re-learn where it needs to be. Sorry I don't have more info, but heard this helped a few people.
I think the ECU can adjust the throttle for you..
Ummm u never take off the positive lead its always the negative but I agree do the idke relearn method.

1. Unhook the negative lead while your brights are on. This drains all power to your Cam Memory (not camshaft)

2. Wait 5min

3. Turn off the brights and reinstall the negative lead.

4. Before turning it on, make sure everything is off (ac/heater, radio, navi)

5. Turn on the car and let it idle untill its at appropriate operating temp (till the little guage says its in the middle) that should take anywhere from 2-10min while it idles DO NOT press on the gas let it idle all ny itself.

6. Turn the AC on full blast on max ac and again DO NOT press the gas let it idle for 3min.

7. Turn off the AC and drive normally for 10 miles Minimum for the car to relearn its idle and fuel trims.

That should help if not fix the issue.
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Old 05-31-2013, 05:48 PM   #4
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Originally Posted by Charlie_santos View Post

Ummm u never take off the positive lead its always the negative but I agree do the idke relearn method.

1. Unhook the negative lead while your brights are on. This drains all power to your Cam Memory (not camshaft)

2. Wait 5min

3. Turn off the brights and reinstall the negative lead.

4. Before turning it on, make sure everything is off (ac/heater, radio, navi)

5. Turn on the car and let it idle untill its at appropriate operating temp (till the little guage says its in the middle) that should take anywhere from 2-10min while it idles DO NOT press on the gas let it idle all ny itself.

6. Turn the AC on full blast on max ac and again DO NOT press the gas let it idle for 3min.

7. Turn off the AC and drive normally for 10 miles Minimum for the car to relearn its idle and fuel trims.

That should help if not fix the issue.
+1
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Old 05-31-2013, 06:13 PM   #5
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Originally Posted by Charlie_santos View Post
Ummm u never take off the positive lead its always the negative but I agree do the idke relearn method.


That should help if not fix the issue.
Curious about why it should suddenly happen. She did a 60 mile commute all fine. But a 2 mile round trip caused it to happen.
Thanks I will try it tomorrow.
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Old 05-31-2013, 06:19 PM   #6
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Originally Posted by Yankytyke View Post

Curious about why it should suddenly happen. She did a 60 mile commute all fine. But a 2 mile round trip caused it to happen.
Thanks I will try it tomorrow.
These are electronic TB not the Old school kind so they may mess up you never know.
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Old 06-01-2013, 01:51 PM   #7
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She seems to be fixed. Thanks Charlie!
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Old 06-01-2013, 01:59 PM   #8
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She seems to be fixed. Thanks Charlie!
Glad I could help bro
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Old 06-01-2013, 02:15 PM   #9
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Originally Posted by Yankytyke View Post

Curious about why it should suddenly happen. She did a 60 mile commute all fine. But a 2 mile round trip caused it to happen.
Thanks I will try it tomorrow.
Mine does this too. Will drop rpm to about 5-6, shake and vibrate then comes back up to 700 rpm
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Old 06-01-2013, 02:19 PM   #10
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Mine does this too. Will drop rpm to about 5-6, shake and vibrate then comes back up to 700 rpm
Oh thats the coil packs bro they dont provide sufficient spark. I swapped mine out and it completely stopped the surging issues. Buy the accell coil packs and your idle and drive will be smoooth
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