2G BISS Screw Head Stripped

[Ferp]

So I'm looking at a fairly clean mostly stock 1999 GST. The only mods on it are a cat back and pod filter and some ebay bov (it is properly recirculated). Anyway the car drives fine and idles fine until operating temperature. At operating idle it has trouble finding idle and stutters out and dies quite easily. I used evoscan to activate the actuator (speed adj screw) and the car could not hold its idle. I checked the biss screw and it is completely screwed in, but the head has been destroyed. I was unable to turn it with any screwdriver or pliers. The kid told me the idle wasn't perfect and in attempt to lower it a bit a friend told him to fully screw in the biss. So does anyone have any tips to get the screw loosened? I told him I would buy the car if I could get that screw turning, if not I want him to knock off the sum for a new throttle body (I know I can get it out but I'd rather just get a new one). Sorry for the long winded post, thanks guys.

 

[slowwhite]

I had this happen also. But for me the screw head split in half. And half of the head came off

I was able to notch a new groove in it. To finally unscrew it.
I can't remember if I used an anti seize type spray or not.
Anyrate wish you luck.

 

[Ferp]

I had this happen also. But for me the screw head split in half. And half of the head came off

I was able to notch a new groove in it. To finally unscrew it.
I can't remember if I used an anti seize type spray or not.
Anyrate wish you luck.

Thank you. I honestly just wanted to take a flat head and bang it in but I didn't want to damage anything.


Does anyone know if I could get a dremel bit small enough to cut into it?

 

[enriquez2000]

best bet is to drill it out and replace it. ive had to remove several that way.

 

[tay97gst]

Assuming its the plastic one you could always heat up the end of a flat head and stick it on to the biss screw to melt your own notch in it. And then unscrew it and replace it.

 

[GST with PSI]

If it's the plastic version, I'd try as tay97gst suggested.

If it won't come out that way, I'd recommend pulling the throttle body. You don't want to drill anything out while the TB is still on the car. All the shavings will end up in the intake manifold if you do.

 

[Ferp]

Well I'm meeting the owner today and I'll bring a flathead and my heat gun. I'll let you guys know how it goes. Thanks for all the suggestions.

 

[miliman13]

Excuse my interruption.
But can any bolt(same thread) replace the bis screw?
Or does it need to have the beveled end?

 

[92AWDHX40]

I used a drill bot but careful not to strip the sides when replacing my biss screw .

 

[Ferp]

Well the hot flat head worked. Got the idle dialled in then the kid decided he didn't want to sell it. He threw me $200 for the trouble but I'm rather peeved.

 

[totaleclipse_05]

Well the hot flat head worked. Got the idle dialled in then the kid decided he didn't want to sell it. He threw me $200 for the trouble but I'm rather peeved.

Wow! Sorry to hear man, better to find another one though based on what you've shared about the owner.

 

[Ferp]

Wow! Sorry to hear man, better to find another one though based on what you've shared about the owner.

Hopefully a blessing in disguise .

 

[2gmitsueclipse]

$200 to repair a BISS screw would be a pretty good day to me. To bad money wasn't exchanged first, then you drove off with it.

 

[Galipso]

if you knew thats all it was you should have bought it and did that at home. but who knows, there could be 1,000,000 other things wrong with it. i love DSMs, but i assume the worst with everyone that is for sale haha

 

[Ferp]

$200 to repair a BISS screw would be a pretty good day to me. To bad money wasn't exchanged first, then you drove off with it.

Yeah. $200 for the 45 minutes total I spent with the car isn't bad at all.

if you knew thats all it was you should have bought it and did that at home. but who knows, there could be 1,000,000 other things wrong with it. i love DSMs, but i assume the worst with everyone that is for sale haha

Yeah, based on this owner the car may have very well been a lemon.

 

[DigORdieTSi]

So here's the thing. THe BISS screw only adjusts the idle speed when you ground out a certain pin on the firewall or ISC connector, I can't remember. Or if you have DSMlink you can go into idle learn and then adjust your BISS. The ISC is always going to attempt to maintain target idle. so when you just turn the BISS screw to raise it, the ISC will adjust right back to where it was by stepping the motor out, lowering the idle again. You go too far, you can burn up ISC motors if they move all the way out trying to maintain target idle.

As far as removing the stuck screw and everything fails to get it to turn, you could remove the intake manifold, drill it out CAREFULLY and get a new one with an o-ring.... Good luck!

 

[GST with PSI]

Well the hot flat head worked. Got the idle dialled in then the kid decided he didn't want to sell it. He threw me $200 for the trouble but I'm rather peeved.

Your typical DSMer would have just said "uh, well, thanks bro" and had you go about your day.

Don't worry, it'll be broken again soon (becuz DSM) and he'll probably be $200 bucks too short to get it fixed. That's where you come in...