Idle bounce when going into neutral

[lootinleoni]

So when I’m cruising and push clutch in and put into neutral to coast to stop intermittently the idle bounces from like 900 to 400 for a couple seconds before finally smoothing out...it’s weird has never died on me though and it does it when engine is cold and warm...

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[Joe 5.0]

Does the bounce happen when you're at a complete stop (after coasting)? I have a 2015 Mustang with an '18 manifold/Lund tune, and the RPM dip that you're describing happens to me often.

The car only died on me once at a stoplight on a hot day, and hasn't happened since.

If you're tuned, try to capture the RPM dip on a datalog and send it over to your tuner.

 

[Zelek]

MAF turbulence most likely.

 

[blackyote_317]

MAF turbulence most likely.

This. I had the exact issue you're describing with my PMAS intake when I rotated my MAF too far down into the engine bay. Hell, it was so bad it would occasionally shut the car down. Took me a week to sort out but the solution was simple: rotate maf back up.

EDIT: If you see your AFR bouncing around more than a few tenths at idle, MAF turbulence is almost certainly the cause.

 

[Zelek]

I had some major MAF turbulence with my Velossatech and the JLT 18 intake when I had it on. The car died a few times pulling up to stoplights. Quite embarassing. My CP-E Icebox hasn't had the turbulence issues the JLT had. I still get some dips with the A/C running, but I'm wondering if that's because my 18 manifold is locked out. Either way, car runs fine now.

 

[Joe 5.0]

This. I had the exact issue you're describing with my PMAS intake when I rotated my MAF too far down into the engine bay. Hell, it was so bad it would occasionally shut the car down. Took me a week to sort out but the solution was simple: rotate maf back up.

EDIT: If you see your AFR bouncing around more than a few tenths at idle, MAF turbulence is almost certainly the cause.

What do you mean "rotate maf back up?"

 

[Nghtshd88]

Just starting having this same issue when cold.. 18 mani with JLT and lund tune. But ive had the mani on for a while.

Also curious what rotating it back up means? Its been in the same place forever.

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