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Old 07-28-2017, 05:18 PM   #1
14chevyss
 
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Weird idle fluctuation clutching in.

Alright so I rarely come to the forums for mechanical advice but I figured maybe other people have had the same experience because I couldn't find a thread with anyone having the same problem as me.

As far as mods go I have PTB, CAI , 1 7/8 long tubes, and a tune.

While driving its fine but sometimes when I clutch in coming to a stop the idle will bounce from like 200 rpm to about 1600 and for a second or two and then settle.

I have checked just about everywhere for vacuum leaks and nothing and wanted to see if this could be a tune issue? Because it didn't do it before the long tubes and the tune so figured I'd ask and see what you guys think.

Thanks.
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Old 07-28-2017, 11:01 PM   #2
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Yes, it could be the tune...the engine learning should help it some after a bit of driving. Without tuning software and datalogging you may need to ask your tuner to revisit the matter if it doesn't go away.

Should be a simple fix though if it is tuning.
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Old 07-29-2017, 02:33 PM   #3
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Yeah but my tuner said it has nothing to do on his part but I guess I gotta find a different tuner
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Old 07-29-2017, 02:48 PM   #4
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Most likely idle/coastdown airflow tables (in the tune). Could be a little adaptive idle (spark) settings also. It all depends...
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Old 07-29-2017, 03:19 PM   #5
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I'm hoping when I get a dyno tune it'll sort that out cuz this remote tune isn't exactly cutting it for me. But atleast I got something else to look in to. Thanks guys
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Old 07-29-2017, 03:28 PM   #6
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Dyno tuning doesn't really focus on idle/coastdown stuff. They're mostly trying to get you the pretty WOT numbers for bragging rights (not entirely true). You're looking at street tuning for daily driving - that's the real world comfort. Maybe the dyno tuner will look over the affected area of your street tune, but it really ain't gonna show up on the dyno and needs to be driven around town a bit.
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Old 07-29-2017, 03:33 PM   #7
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Quote:
Originally Posted by 14chevyss View Post
Alright so I rarely come to the forums for mechanical advice but I figured maybe other people have had the same experience because I couldn't find a thread with anyone having the same problem as me.

As far as mods go I have PTB, CAI , 1 7/8 long tubes, and a tune.

While driving its fine but sometimes when I clutch in coming to a stop the idle will bounce from like 200 rpm to about 1600 and for a second or two and then settle.

I have checked just about everywhere for vacuum leaks and nothing and wanted to see if this could be a tune issue? Because it didn't do it before the long tubes and the tune so figured I'd ask and see what you guys think.

Thanks.
Why is that a problem if you have the clutch disengaged?

It's an emission requirement to burn off unburned fuel when the O2 sensors are detecting.
Dump the long tubes and the stock manifolds will retain enough heat to burn it off without the extra revs.
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Old 07-30-2017, 06:53 PM   #8
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This happened on my car when I first got it tuned. When I would push the clutch in put it in neutral then let the clutch out; the rpms would rev up to about 1200 until I hit 0mph and it would go back to normal idle. This is all tune related and your pcm will not "learn" to make it stop.
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Old 07-31-2017, 02:35 PM   #9
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I'm hoping when I get a dyno tune it'll sort that out cuz this remote tune isn't exactly cutting it for me. But atleast I got something else to look in to. Thanks guys
What software are you remote tuning with.

I would be happy to help with this problem.

List all your mods as well.

Ted.
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Old 08-01-2017, 10:16 AM   #10
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What software are you remote tuning with.

I would be happy to help with this problem.

List all your mods as well.

Ted.
I've been using the sct x4
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Old 08-01-2017, 10:25 AM   #11
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I've been using the sct x4
Great, Your Mod List Please.
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Old 08-01-2017, 12:09 PM   #12
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Great, Your Mod List Please.


Sorry didn't see that lol.

I have a vmax ptb, k&n cai, 1 7/8 lth, and a muffler delete if that makes a difference lol
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Old 08-01-2017, 12:31 PM   #13
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Sorry didn't see that lol.

I have a vmax ptb, k&n cai, 1 7/8 lth, and a muffler delete if that makes a difference lol
It does, but we can certainly handle this for you.

Email me your stock file, all your info, all your car info, mod list and octane burned.

Ted.
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Old 08-12-2017, 10:21 PM   #14
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There is a parameter in the pcm for manual transmissions that is called clutch fuel cutout which may be causing your issue because your tuner may have your car on a maf only tune and may have over compensated somewhere and when the clutch in fuel cut off engages the sudden change in fuel delivery may be causing your issue. There is also a parameter call decal fuel cutout that also may be affecting it too. If you have a wideband o2 sensor it will pick this up as your a/f ratio will go extremely lean when those fuel cutout engage.
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