When I take my foot off the gas in gear (M6) the car slows as it should. When I push in the clutch and put it in N and foot OFF the gas, rpms drop 1-200 then slowly glide up to 2500ish. I have no SES light. Sometimes it does this, sometimes they hesitantly drop, other times (once) my rpms dropped to 600 and refused to go up again to the normal 750-800. This problem is fixed when I shut off/re-crank it.

I think this might be the IAC, where is it located on an F-body? Is it that selenoid thing on the upper/driver side of the TB area? Opinions? Help, this sucks

 

Okay, removed/sprayed IAC with de-greaser. RPMS drop a lot faster, idle smoother, problem fixed.

1200 miles on 10-30 M1 EX performance, 80% highway

@1/4 qt. used. Sounds like my LS1 doesnt drink much oil at all, considering most LS1's go through M1 like gangbusters. Will be goin with 0-30 GC next oil change, hopefully it wont make the valvetrain louder like 10-40 Syntec did anywho, loving it

 

GC is amazing

 

uuuuhhhh....okay?

 

my name is lance, and i like nuts...

 

this whole thread was basically blkws6 talking to himself..

You look quite foolish in my eyes, sir.

 

I was seeking advice as to WHY my rpms rocketed to 2500 when I put it in neutral...I just found out for myself before anyone got a chance to tell me, and posted my findings for those of you who may or may not have/run into this problem. Creating an archive, if you will, for this problem, so that in the future someone with "search" could find it. When I searched it, I got hazy/half baked info that may or may not relate to my issue.

 

lol post of the year cantidate?

 

Ib4tl!

 

Hey BLkWS6,
Thanks for the info man, I had the same problem and now it is fixed!












not really, but you guys get the point...********...

 

...so what happened next?

 

Car drives well, no sticking rpms, and im going home tomorrow

 

Glad you found your problem

 

Hey, my car does the same thing. Time to spray the IAT sensor. thanks BLKWS.6.

And I'm not joking at all, he accomplished his goal to help.

 

dont spray your IAT, its the IAC.

 

+1 LEAVE THAT IAT THE HELL ALONE!!!!!!!!!!!

Glad SOMEONE benefitted from what others called a nonsensical soliloquy

 

DO NOT! press/pull on the "rubber plunger thing" it could hurt it, just hose the snot out of it with carb-cleaner and try to squirt it into its internals. hose her out good and you may be able to avoid buying a new one

 

Good call guys, sorry for the typo.

 

Weird, never did it when I had it (with the 408). Give me a shout and let me know how its doing.

 

I just replaced the IAC, it was randomly killing the car in off-throttle situations. NOT COOL! All is well $200 later (GM scanning to PROVE it was not the fuel pump ect. and a new IAC from Oreilys)