Unique high RPM at idle

[freedom_in_4low]

I don’t understand how I wouldn’t see that with a smoke test

when did you do the smoke test? If you did it on a cold engine, you might not see it. Since you describe it starting out at 1100 (which is about normal for a cold start) and then rising, it seems like something is opening up as it warms.

 

[jwilkinson01]

when did you do the smoke test? If you did it on a cold engine, you might not see it. Since you describe it starting out at 1100 (which is about normal for a cold start) and then rising, it seems like something is opening up as it warms.

Thanks Freedom. I tested on a hot engine but not a running engine, of course.

The issue has been isolated to the aftermarket TB. Keeping the same gasket and sensors and switching only the TB I can fix and recreate the issue. I am working with F&B who made the TB.

 

[macleanflood]

FYSA this is my stock TB. I replaced the gasket after this test BUT I didn't have any idle issues before or after...this was just curiosity. I think I need to o-ring the TB. But don't want to break what doesn't need fixed.

-Mac

 

[Vtx531]

Performance throttle body gave you 250-300% more HP at idle. Amazing results!

 

[hear]

Performance throttle body gave you 250-300% more HP at idle. Amazing results!

Let me tell you about this one certain oil filter.....

 

[Old Jeepin Cowboy]

Perplexed. I tap the pedal and it drop to normal idle, its only happened a few times...

 

[Rygrego]

That's because NTK no longer makes them.

They came up with a universal part that's basically with a longer wire or something...instead of two identical parts one with 6 inches more of wire.

What voltages are showing for the O2s in ODB live data? Anything below.9v generally and simplistically saying is a significant a good O2 sensor.

Also...the PCM doesn't change idle based on O2s.

It's either vacuum or your IAC...and since you don't have a stock TB perhaps that's the issue?

-Mac

 

[D_C]

Your manifold gasket could have burned through in-between the intake and the exhaust ports. If it was leaking before then I would check it. Sealed at the edges but burned through in-between.