'00_Z

iTrader: (3)

I swapped my stock throttle body for a BBK 80mm and did the TB coolant bypass while I was at it. When I fired the car up afterwards there is now a distinct whistling at idle that changes tones. I'm assuming its a vacuum leak but from where? The only other thing I did was pull the seal off my lid because it was coming off anyways and I'm positive the gasket is on the right way.
My other concern is that the throttle is real punchy from a stop. I got the tb used but its in great shape. Is this normal, it seems to function fine on the road. Is it just tight or do I maybe need to adjust the throttle stop set screw?
Thanks for any help.

TImmy_Jones

iTrader: (4)

What do you mean by punchy? Does it idle high or search for idle?


To check for a vac leak spray some brake cleaner around the TB (after the MAF) if the idle stumbles you have a leak and need to address it.

'00_Z

iTrader: (3)

Idles fine, by punchy I mean when I first give it gas it is almost like there is a slight delay and then the car lurches forward. It almost feels like there is some slack in the throttle cable.

bayer-z28

iTrader: (14)

^ Put your foot on the throttle (Engine off) and kind of stand out the door. Look under the hood and tap the throttle a couple times. But other than that, if the cable is taught on the TB, you're good.

x2, but if it idles fine, 10-1 you're good.

And the whistling??? You should hear my FAST 102 on a cold start.. Sounds like it could suck up a child.

TImmy_Jones

iTrader: (4)

You can check for slack fairly easily (I think), just invite a friend over to rev it a little and watch the cable.


Does it idle high or like stock?

'00_Z

iTrader: (3)

It may just be me being crazy but I'll look into it some more. If the whistling is kind of normal than I'm fine with it, nothing wrong with scaring little kids!!

'00_Z

iTrader: (3)

It idles like stock. I can't imagine why there would be slack, I only unhooked the cable from the old one and hooked it into the new one.

Element

iTrader: (5)

Wires stretch, and it might simply be more noticeable going from a stock TB to an aftermarket one. Easy enough to adjust the throttle cable tension, though.

'00_Z

iTrader: (3)

I just went out and drove a round a bit more and it is idling a little high. If I let off the gas while going down my street it was running 30mph. I'll try adjusting the screw on the throttle arm and see what happens. The whistling annoys me more than anything though and its not a sucking noise like Bayer has. I'll have to mess with it another day.

dr_whigham

iTrader: (49)

Kinda like built in cruise control.... Same problem here! This happened right after I installed my P&P throttle body.

bayer-z28

iTrader: (14)

You have to check the voltage on the TPS when messing w the screw. Search for it. I forgot what the voltage should be. Either that or a handheld should read 0% throttle. It does more than control the idle.

dr_whigham

iTrader: (49)

I believe it's suppossed to be .6 volts or something.

Problem is, I have no scan tool or multi-meter..... yet

bayer-z28

iTrader: (14)

^ Just some $0.02, but Craftsman has some rather decent looking ones for ~$30-$40. Just an option for ya.

crainholio

iTrader: (2)

What torque value did you use for the TB bolts?

TImmy_Jones

iTrader: (4)

Does the BBK TB have an idle adjust screw? Could be as easy as just adjusting the screw.

dr_whigham

iTrader: (49)

I don't know if this was directed at me, but I just tightened it down till it felt "tight." With 136k on the clock, maybe I should have replaced the gasket too....?

'00_Z

iTrader: (3)

I did not torque them. It could be the gasket I suppose, I plan to pull it off and check it out.
And yes there is an idle adjust screw. I plan to adjust that as well.

crainholio

iTrader: (2)

The bolts only torque to 106 lb/in. If you guys can get that accurately by hand, you're much better than me.

I'd definitely replace the TB gasket, and I'd use a torque wrench to ensure the TB is uniformly tightened to the intake.

'00_Z

iTrader: (3)

I went and tightened down the bolts a little more, backed off the idle screw a bit and fired it up. It idled the same, which I pretty much assumed it would and best of all no whistling. I went out and drove around for a while and it still seems a little more touchy than before but not as bad as yesterday but I'll keep an eye (ear?) on it. As I sold off a lot of tools to make the move down here to Kansas I definitely need to start restocking so I'm working with what I have. Thanks for all the help guys!

crainholio

iTrader: (2)

Best money I spent a while back was a 1/4" click-type torque wrench. It does the manifold bolts, fuel rail bolts, coil packs, TB, valve covers...the list goes on. Lots of fasteners in the 88-106 lb/in range, the components they hold are flimsy, and the threads are soft.