Persistent Idle Misfire

[Daryl333]

Interested to hear what Whipple has to say.

Whipple said howling/whistling is from the gears in the Throttle body. Which is okay I don't mind the sound.
Whipple said all fuel trims spot on altho a slight variation in idle speed. I think Lund just didn't take enough time to dial in the little shit. Instead blame it on my car like many others on this forum.
As for misfires there is no data in the logs for misfire. I used Lunds configuration file that I've been using from day one. So no data on that.
Set a date for an in house Dyno Tune up here on the 24th. Finally found a reputable guy that will take it on. Hopefully this will solve out my dead pedal and idle issues.
Shout out to Whipple for having returned my datalog info within a couple hours of me sending logs and video.

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[Daryl333]

Here’s a long shot…. I had persistent low rpm misfires on my Roush blown car and threw parts at it to no avail. It ended up being a small crack in the plastic one way valve running in between the supercharger and my JLT catch can. I replaced the hose assembly and valve and the misfires are gone. Might be worth a look…

We've pulled and inspected every vacuum line etc and inspected including smoke and brake cleaner test X2.
But thx for that all opinions ideas are welcomed.

 

[Daryl333]

It's not a batch fired system so was the damper really needed ?

Air moving pass the TB blade at low throttle settings will do that.

I sent Whipple a video they said it's the three gears in the Throttle body causing this.
But from the sound it's probably a little of both.
Thx.

 

[Daryl333]

If it's howling, that indicates a leak and you're hearing the air passing by the gasket, which would also give you the symptoms of a vacuum leak. Un-metered air is getting into the air inlet post MAF. Pull that TB and inspect the gasket. If it looks good, re-install and torque to 70 in/lbs. Personally I would replace that gasket even if it looks good.

I'm listening to what you're saying but I've read in here that when that gasket goes it throws a code but am definitely going to order one. One never knows right? Tried every other bloody thing under the sun.
Thx.

 

[Daryl333]

Maybe thermal related. Some have reported issues with the 132 when it gets heat soaked. Guy on FB makes this thermal spacer for $75. Might be worth a try.

Plus my car is misfiring right from cold start.
Thx for the info everything helps.

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