Ben99Z28

Well, my 99 Z28(M6) surged and stalled pretty bad after we'd installed the TR 224 112LSA cam, i was told to drill the TB plate so I'd add an extra 9/64" hole, the existing one on the bottom plate is like 5/64" so I would guess both of them should add up to 14/64"?? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

BTW, before I'd drilled the plate, IAC pintel position was around 43 after warmed up, but now it gets all the way down to 0!! <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> am I doing something wrong here? should i seal the new hole and enlarge the existing hole just a little bit??

<small>[ June 02, 2002, 06:22 PM: Message edited by: Catfish ]</small>

AlonzoVersion 1.0

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Catfish:
<strong>Well, my 99 Z28(M6) surged and stalled pretty bad after we'd installed the TR 224 112LSA cam, i was told to drill the TB plate so I'd add an extra 9/64" hole, the existing one on the bottom plate is like 5/64" so I would guess both of them should add up to 14/64"?? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I think you can bump up your idle as well to help it idle better.

Ben99Z28

We'd already raised the set screw on TB after the cam was installed but it only help a bit, have LS1 Edit on the way...

AlonzoVersion 1.0

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Catfish:
<strong>We'd already raised the set screw on TB after the cam was installed but it only help a bit, have LS1 Edit on the way...</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That will cure it but heres a TTT for you.

Patrick G

iTrader: (14)

You want your IAC count in the low 40s to high 30s in neutral. If it's lower than that, you drilled too big.

OBSSSD@work

Why drill the hole? Get a hold of a Tech II and use the adjustment screw on the TB abd get the IAC count to 35 in nuetral.

Mine idles like a kitten @ 850-900 with the TR224-112 in an A4.

MY99TAWS6

iTrader: (3)

Well......I talked to people on the board and drilled my tb to 13/64 and turned the tb idle screw over so I can adjust it from the top..my iac does go to zero when car is stopped now..but goes up normally when moving..car seems to run perfectly..no stalling when hot..haven't tried my air conditioning ,it needs to be recharged.I drained it for my cam install even though not necessary.Anyway as you can see I have the b1 cam..no codes from drilling the tb or the idle screw..so what is it supposed to do if you have
zero iac count when stopped???

2001CamaroGuy

iTrader: (6)

How do I check what my IAC pintel position is (AutoTap)??? I had AutoTap on the car last night but didn't know what heading to look under. What do I look at?

Thanks

Chris

OBSSSD@work

I checked my IAC count with a Tech II tool like they have at the dealer. My count was 130 in nuetral until I adjusted it and got it down to 35. I can start the car dead cold and it idles smooth as silk right off the bat and it is still perfect with the A/C on.

If you are at 0 that is not good. I would epoxy the hole up with some JB weld and re-drill it smaller until you get where you need to be. If you get it right the car will be much more driveable, especially when it is cold.

Scalpel

iTrader: (4)

So a TechII can adjust your IAC count? How do you do this?

Scalpel

iTrader: (4)

Stupid question but do you just drill out the existing TB hole are make a new one? Thanks.

OBSSSD

A Tech II tool can measure your IAC count. You must measure it when the car is warmed up to normal operating temperature. You get you IAC count down by adjusting the set screw on the throttle body which gradually cracks the blade open. If you're going to drill you need to enlarge the existing hole and you can achieve the same result as adjusting the set screw. Your IAC count is a function of increasing or decreasing the air coming into the engine at a warm idle.

I never checked my IAC count stock but when I installed the TR224-112 the IAC count was about 130 at warm idle. I had to crack trhe blade more than I wanted to get the count to 35 so I'm probably going to drill out a size or two and re-adjust the TB blade.

Do NOT drill out several sizes over at once. Do one size at a time and keep re-checking it until it's where you want it. Also, be careful of getting shavings sucked in through the intake if you try to drill the TB on the car.

Chris

BlackhawkSS

iTrader: (3)

you should drill out the existing hole not make a new one.
you shouldnt have drilled it if your iac count was around 40, it was your idle set screw. small adjustments on that screw can make drastic changes. IMP jb weld that hole (both of them) and start over with one hole around 9/64. then set the idle set screw. and the setting depends on where you have your idle set for in gear and out of gear. it takes some playing with and starting it up many times lol.
i eventually got mine set to idle at 700 rpm in PARK and mine is an A4!!
Talk about a sweet *** lope thru the x-pipe <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
good luck. BTW i must have jb weled my hole 5 times before i finally got it right. but if you are going with and 850 or 950 idle as most do then it should be really easy for you to set yours.
Jerry

01SStud

Pardon my ignorance, but how do i know which screw is the set screw on the TB. Just installed the thunder 230, so it needs adjusting.

Chris

BlackhawkSS

iTrader: (3)

its the screw that the linkage sits on

MY99TAWS6

iTrader: (3)

I think there may be some confusion on this tb hole thing..some guys on this post have autos..some like the guy that asked the original question have an m6 like me.I had idle counts I think around 50 plus range..and my car was dying in hot weather..with the air not even on.I don't have my air working yet since I drained it for my cam install...I know I didn't have too..but anyway I followed advice of ls1derfull..he set he drilled his 13.64 and flipped the screw.I am pretty sure he had an m6..also jason 99 the guy who has put in lots and lots of cams also drilled his hole bigger..and pretty sure Jason has an m6 too.I have no doubt it will be different for auto cars.I do get zero like ls1derfull told me at idle now but car starts fine,runs fine,doesn't stall..so what big deal does it matter if the iac counts go to zero at idle on an m6..they go up again as soon as I step on the gas.I get no codes ,nothing..so whats the big deal..why should I jb the hole and start again.can anyone with an m6 give an answer here..not interested in auto car hole sizes..the guy who posted the question has an m6..not trying to be a jerk here,no everyone on this board tries to be super helpful.

Ben99Z28

thanks guys, well..like MY99TAWS6 said, my IAC is 0 after the car fully warmed up but it seems to run and idle fine, didn't make any difference after I drove it for awhile and let it idle as well...still stays at 0 <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> SO, does IAC pintel position affect performance, air/fuel, or anything at all?? why should we keep it in between 30~40 though??? could someone please explain? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />