Throttle Body ?

01WhiteNe0n · Post by **01WhiteNe0n** » Sat May 12, 2007 6:36 pm

Well Ive had the problem b4 and its been back for pretty much never went away and my car drops to 500 rpm and idles there and basicly starts like a vibration on the whole car.
This happened from putting on my borla exhaust.. I thought it could of been my stock air box and now with a aem intake which didnt help the problem I was told some1 fixed it by drilling a hole in throttle body butterfly plate thinger and that brought the idle back up to the usual 900 rpm.. I did this but it did't pull it back up to normal, My question is... Would getting a larger throttle body solve the problem ? If so what a good size to go ? What difference between different tb's And Where can I get one at a good price ?

Any help and suggestions is appreciated.

WykedHellFire · Post by **WykedHellFire** » Sat May 12, 2007 6:37 pm

01WhiteNe0n · Post by **01WhiteNe0n** » Sat May 12, 2007 6:39 pm

Stop whoreing in normal threads lol.
I really want to fix this damn problem.

WykedHellFire · Post by **WykedHellFire** » Sat May 12, 2007 6:40 pm

I actually want to know this answer lol, I have the same question.

01WhiteNe0n · Post by **01WhiteNe0n** » Sat May 12, 2007 6:41 pm

Ah I see, Do you have stock exhaust ? Or what kind do you have ?
I dont really know difference in different tb's But i'm guessing popssibly my problem is that at idle the car isnt getting enough air anymore with the bigger exhaust so the bigger tb will let more air through at idle ?

WykedHellFire · Post by **WykedHellFire** » Sat May 12, 2007 6:43 pm

idk actually, it's custom duals but I didn't put them on...they were on when I got the car but yeah It idles low as hell.

SlvrACR · Post by **SlvrACR** » Sat May 12, 2007 7:07 pm

Its not he larger TB that fixes it, its the fact that the AM TB has an adjusting screw

WykedHellFire · Post by **WykedHellFire** » Sat May 12, 2007 7:09 pm

01WhiteNe0n · Post by **01WhiteNe0n** » Sat May 12, 2007 8:58 pm

So any Tb with an Adjusting screw on it would be able to fix my problem ? Also wheres the best place I can get one with an adjusting screw.

JRM · Post by **JRM** » Sat May 12, 2007 10:20 pm

modernperformance.com

OB · Post by OB » Sat May 12, 2007 10:37 pm

My stock TB has an idle adjustment screw, I assumed all 2gns came with them. The installation of a catback exhaust really has no way of affecting the way your car idles. A CAI (especially a brand name one that uses the oem sensors) will not cause this either, unless you installed it wrong. Installing new parts in attempt to fix a problem is the worst way to go about this type of issue. Neither is drilling holes in your throttle plate. If you have the resources, check your sensors (TPS, IAC, IAT, etc) for proper operation using a DMM. If your car is eqipped with an idle adjustment screw (under the back side of the TB, below the cable), try raising the idle that way. Pull the OBDII codes from the dash display. If you get something like P-0508, then the IAC is at fault. Could be dirty or damaged.

01WhiteNe0n · Post by **01WhiteNe0n** » Sat May 12, 2007 10:40 pm

Might be a nub question But I never knew how to pull codes ? How do I do that.
And thankyou for all the help so far

WykedHellFire · Post by **WykedHellFire** » Sat May 12, 2007 10:42 pm

turn the key three times without starting the car then look for a code where the odo is.

01WhiteNe0n · Post by **01WhiteNe0n** » Sat May 12, 2007 10:44 pm

ima run outside and try it

So like turn the key to the point where radio and windows are useable three times ?

WykedHellFire · Post by **WykedHellFire** » Sat May 12, 2007 10:45 pm

yup, then there should be a number sequence that shows up

01WhiteNe0n · Post by **01WhiteNe0n** » Sat May 12, 2007 11:01 pm

hmm didnt get anything
I'm not sure if i would be pulling the code correct.
I turned the key as if i was gonna turn on till power came to the car turned off and repeated 3 times in a row right ?
If so nothing came up

WykedHellFire · Post by **WykedHellFire** » Sat May 12, 2007 11:03 pm

yeah, do it somewhat slowly not real fast...if these is no code it should say "done" after a few seconds

sirvaliant_98 · Post by **sirvaliant_98** » Sat May 12, 2007 11:12 pm

your borla exhaust should not be your problem and neither should your intake. I would take a look at your IAC(idle air control valve) located on the top of your TB. If this is real dirty, look like black sute, clean it off and see if that helps.

SlvrACR · Post by **SlvrACR** » Sun May 13, 2007 10:00 am

I also have heard on SRTforums that the stock ground wires are junk. Upgrading them smoothed out idle for alot of the mebers that did this. I have it on my car but I have solid mounts and AM T/B so im not sure if it helped me much others then help the lights from dimming.

01WhiteNe0n · Post by **01WhiteNe0n** » Sun May 13, 2007 10:31 pm

Still couldnt get my car to show any codes or say done, I was looking at the sensors and which one would be dirty the one on top of the intake ? And are the sensors in the little black housing.

SlvrACR · Post by **SlvrACR** » Sun May 13, 2007 10:35 pm

The side is the TPS (Throttle Position Sensor) and the top metal one is the IAC (Idle Air Control).

01WhiteNe0n · Post by **01WhiteNe0n** » Sun May 13, 2007 10:41 pm

Are they in a housing, I know they look like that little red thinger that you push or pull or w/e to get off but I didnt want to brake it, I pulled out the whole IAC and it was just a blk plastic piece, I'm guessing the sensor is inside ?

01WhiteNe0n · Post by **01WhiteNe0n** » Mon May 14, 2007 10:29 pm

might be a nub question but how do I take off the throttle position sensor, I was looking at it and do I have to unscrew it ? or is there a clip ? All help appreciated.

OB · Post by OB » Tue May 15, 2007 4:31 am

the TPS is held in with two torx screws. I forget the exact size, but its relatively small.

The IAC is the aluminum piece that is mounted directly over the throttle plate (on the TB). It is attached by two 8mm(?) screws.

Other common things that cause erratic idle include:

-Vacuum leaks, even minor ones.
-Poor grounds

01WhiteNe0n · Post by **01WhiteNe0n** » Tue May 15, 2007 7:55 am

Thankyou I didn't have alot of time last night, I got the front calipers painted and now I gotta do the drums in the back.. So I didnt wanna jump into unscrewing it and then cleaning it and stuff so i'll be sure to get it off before work.

OB · Post by OB » Wed May 16, 2007 12:14 am

Be sure to keep these kinds of sensors very clean when taking them apart. Use a can of air spray (like the computer cleaning stuff) or if you have access to compressed air, spray a bit on the IAC to clean it out. It should be spic and span, unless you ran the car without an air filter or something.

01WhiteNe0n · Post by **01WhiteNe0n** » Wed May 16, 2007 7:30 am

Well when I bought the car the air filter was amazingly black ... so mayb dirt got through to the sonsor.

01WhiteNe0n · Post by **01WhiteNe0n** » Wed May 16, 2007 3:42 pm

Going to take off the throttle body now, Ill be sure to take pics and if its dirty or not

01WhiteNe0n · Post by **01WhiteNe0n** » Wed May 16, 2007 4:58 pm

I wiped it off and Blew it out, the towel came a little dirty but i'm not sure if it helped at all considering i drove not ever .05 miles to the garage

Random bay shot

OB · Post by OB » Thu May 17, 2007 12:29 am

TPS looks ok from what I can see. Those are some terrible pics though, especially when youre trying to show dirt. haha

Did you check the IAC? That's much more likely to be affected by dirt than the TPS