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Old 06-14-2012, 11:22 AM   #1
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Low idle

Jus tuned my car and added a few mods and my rpms are bouncing from really low to jus about 1000. And when I let the clutch out without barely giving enough gas the engine shakes and idle starts to bounce. Anyone know what's going on? Something to worry about?
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Old 06-14-2012, 11:37 AM   #2
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Quote:
Originally Posted by T_math_6
Jus tuned my car and added a few mods and my rpms are bouncing from really low to jus about 1000. And when I let the clutch out without barely giving enough gas the engine shakes and idle starts to bounce. Anyone know what's going on? Something to worry about?
Car has to relearn idle, some times mine dies while coasting after a new tune
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Old 06-14-2012, 11:58 AM   #3
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You can speed up the re-learn time by doing this...

Disconnect NEG from battery for 30min

Reconnect and start car, let idle until engine gets to operating temp. Let idle a little over a minute

Turn on A/C to MAX, let idle little over a minute, turn off A/C

Then drive the car for at least 10 miles
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Old 06-14-2012, 12:13 PM   #4
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Thanks for tips! So nothing to serious to worry about?
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Old 06-14-2012, 12:20 PM   #5
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Quote:
Originally Posted by T_math_6
Thanks for tips! So nothing to serious to worry about?
I doubt it. It's pretty common for the idle to get mixed up now and then. What mods did you install?
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Old 06-14-2012, 12:23 PM   #6
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High flow cats, x pipe, chipped it, hurst short throw. Soon to put on pypes muffler delete when they come in.

---------- Post added at 12:23 PM ---------- Previous post was at 12:22 PM ----------

I'm thinking high flow cats may have something to do with it too
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Old 06-14-2012, 12:25 PM   #7
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Quote:
Originally Posted by T_math_6
High flow cats, x pipe, chipped it, hurst short throw. Soon to put on pypes muffler delete when they come in.

---------- Post added at 12:23 PM ---------- Previous post was at 12:22 PM ----------

I'm thinking high flow cats may have something to do with it too
Is the idle the only thing going on or did you get a check eng light?
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Old 06-14-2012, 12:29 PM   #8
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Are you throwing any trouble codes?
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Old 06-14-2012, 12:36 PM   #9
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No trouble codes. And the check engine light hasn't came on yet but will eventually with the high flow cats
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Old 06-14-2012, 12:41 PM   #10
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Quote:
Originally Posted by T_math_6
No trouble codes. And the check engine light hasn't came on yet but will eventually with the high flow cats
Definitely check the code(s) to make sure there isn't something else that is not related to the x pipe.
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Old 06-14-2012, 10:37 PM   #11
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What could be wrong with the codes or x pipe?
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Old 06-14-2012, 10:47 PM   #12
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Re: Low idle

...if you get any codes, if you CEL comes on. Doesn't sound like your getting the check eng light, right? How did the idle re-learn do?
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Old 06-15-2012, 01:07 AM   #13
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I haven't done all of it yet I didn't have time. It runs fine and idles fine when I jus let it idle. But when I give it gas and then let it idle that's when it goes low. Like when I hit a red light it will start bouncing
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Old 06-15-2012, 10:12 AM   #14
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And no, check engine hasn't came on yet
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Old 06-15-2012, 09:26 PM   #15
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I also have a low idle. Just put a tune in with a Cai, and it idles low and pulled a check engine light for being at idle lower than expected. Doing the idle relearn as I type this hope it fixes it.
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Old 06-17-2012, 10:37 AM   #16
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Quote:
Originally Posted by Joel_L_H
I also have a low idle. Just put a tune in with a Cai, and it idles low and pulled a check engine light for being at idle lower than expected. Doing the idle relearn as I type this hope it fixes it.
Plug your tuner in and adjust the idle. I had bump mine up a hundred rpm
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Old 06-17-2012, 10:41 AM   #17
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Originally Posted by Stang.racr

Plug your tuner in and adjust the idle. I had bump mine up a hundred rpm
How do I do that? Just got the tuner so I'm new to it
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Old 06-17-2012, 10:50 AM   #18
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Leave the key in the off position then plug the tuner in, it will tell you to turn the key to the on position. It should list a- trouble codes, b- tune parementers or something like that. Click the tune option and you will see a option to adjust tire size, gear adjustments, tran **** points and etc... Click on the idle/ rev control. There is a back button and you will be okay tinkering with it as long as you don't follow directions. I'm offshore and dot have my tuner so sorry if I'm not direct enough. Just play with it or do a YouTube search
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Old 06-19-2012, 07:56 AM   #19
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I have the SCT and those options aren't available from just turning it on
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Old 06-19-2012, 08:12 AM   #20
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I'm in the same boat just tuned my car and idle is very low, but I have had no problems or any trouble lights go on, so as of now im just gonna leave as is
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Old 06-19-2012, 08:27 AM   #21
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Quote:
Originally Posted by Artaz
I'm in the same boat just tuned my car and idle is very low, but I have had no problems or any trouble lights go on, so as of now im just gonna leave as is
Have you tried the idle re-learn to see if that fixes the low idle? Sometimes this is needed after installing a CAI, but it's a simple thing to try.
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Old 06-19-2012, 08:46 AM   #22
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Quote:
Originally Posted by T_math_6
Jus tuned my car and added a few mods and my rpms are bouncing from really low to jus about 1000. And when I let the clutch out without barely giving enough gas the engine shakes and idle starts to bounce. Anyone know what's going on? Something to worry about?
It might just be your stepper motor going out, my 05 has this problem
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Old 06-19-2012, 08:48 AM   #23
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When I turn my A/C on it makes it worse. When the Rpms go low and bump back up my air goes with it.
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Old 06-19-2012, 10:10 AM   #24
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Quote:
Originally Posted by Azure

Have you tried the idle re-learn to see if that fixes the low idle? Sometimes this is needed after installing a CAI, but it's a simple thing to try.
Not yet I was gonna wait and see if it keeps it up, If so I'm gonna try it thanks for the help, the idle re learn does not mess with the tune or anything right?
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Old 06-19-2012, 10:25 AM   #25
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Quote:
Originally Posted by Artaz

Not yet I was gonna wait and see if it keeps it up, If so I'm gonna try it thanks for the help, the idle re learn does not mess with the tune or anything right?
Nope!
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Old 06-19-2012, 06:04 PM   #26
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I've done the idle relearn and it didn't help. When I turn the air on the idle gets worse. Just like everyone else. I called bama got another tune and it still didn't help. Idk what to do

---------- Post added at 07:04 PM ---------- Previous post was at 07:03 PM ----------

Quote:
Originally Posted by 05MUSTANG4.0L

It might just be your stepper motor going out, my 05 has this problem
What is the stepper motor
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Old 06-19-2012, 11:11 PM   #27
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Quick question. Wen u clear ur dtc codes r they supposed to come back. I keep clearing the check engine light on mine and it keeps shooting it back.
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Old 06-20-2012, 06:47 AM   #28
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Quote:
Originally Posted by Joel_L_H
I've done the idle relearn and it didn't help. When I turn the air on the idle gets worse. Just like everyone else. I called bama got another tune and it still didn't help. Idk what to do

---------- Post added at 07:04 PM ---------- Previous post was at 07:03 PM ----------



What is the stepper motor
If you take off your dash and u open it you will see a little motor that moves your dash needles
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Old 06-20-2012, 11:01 AM   #29
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Quote:
Originally Posted by 05MUSTANG4.0L

If you take off your dash and u open it you will see a little motor that moves your dash needles
It's not just the needle dropping down.its the engine actually dropping to lower rpms and almost dying out
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Old 03-12-2014, 10:56 AM   #30
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I'm having the same problem with my 06 GT. When I out the clutch in when stopping it idols really low and sounds like it gonna die then my RPM gauge starts searching for normal idol and then when I take off ill give it gas and let the clutch out my car doesn't go anywhere and my RPMS stay low and then it back fires twice and then takes off I have no clue what is wrong with it I recently put a few mods on I have 60mm throttle body, BBK shorty headers, stage 2 McLeod clutch kit, and a bama performance tune but I returned it to stock. When I was bolting up my tranny an O2 sensor got caught in the tranny and broke off I haven't had time to fix it. I couldn't imagine that that's the problem. Could anybody help me out before I take it to a shop?
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Old 03-12-2014, 11:02 AM   #31
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My issue was the throttle body needed to be cleaned. Small thing that you wouldn't think would affect it so much but when I cleaned it it idled better. Also cleaned the maf sensor. Also bans tunes suck *** could be causing an issue to. I had to datalog and send it to them for a better tune. Also I bought a tps as well because car would go into limp mode. That fixed it.
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Old 03-12-2014, 11:14 AM   #32
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Even tho it's a brand new throttle body I should still clean it?
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Old 03-12-2014, 11:45 AM   #33
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Didn't read it was new sorry I was in a hurry to get to work. If it's new then no. Does the new one come with a new throttle position sensor if not try that. Is it pulling any codes?
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Old 03-12-2014, 11:55 AM   #34
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It says intake (a) camshaft position actuator circuit open Bank 1 and bank 2 and then it throws another code Evaporative emission system purge control valve circuit and Evaporative emission system vent control circuit. Now I'm not to familiar with these codes. I did buy the car used with 49000 miles on it so I have no clue what the last guy did to it besides a cold air intake hurst short throw and SLP axle backs
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Old 03-12-2014, 06:09 PM   #35
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The evaporative code with the emmisions might just be your gas cap wasn't tight and it pulled a code my car as done that before once you tighten it and clear it it won't come back but I've never seen the other code
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