Throttle Body Iac Screw Options

[calin666]

I am trying to pull the IAC out of my trottle body, but the screws won't come out. I am worried about stripping the damn thing. And yes, I am turning it the right direction.
Is it normal for the screw to be that difficult to remove? I am thinking I am going to have to drill it out, and tap it.
Any advice?

[MadHatterEvo]

I know you probably already thought of it, but maybe in your heated moment, it slipped your mind. WD-40, or other penetrating fluid...

Is it unscrewing most of the way, and then stopping, or is it just not moving? If it is unscrewing then just stopping, try hitting it with the penetrating fluid, screw it back in and unscrew it like 5 or 6 times, adding the WD-40 each time...

If it's stuck and not moving at all, and the WD-40 don't work, I seen a neat trick on Horsepower you can probably use if you drill it.

Drill the broken/stuck bolt out. Drill the hole to a larger size, then use a matching larger bolt. Then drill out the middle of that bolt and tap it, so you can have the stock thread pattern/pitch.

[kOMPRESSOR]

Why are you doing this?

[calin666]

It's a LONG story, and there are a couple of threads started on it, trying to get the probem fixed, which seems to be some sort of a fuel delivery/idle problem.
Pulling the IAC out for a good cleaning/replacement is one of my last options, after that it is either the fuel pump, or maybe the exhaust system.
Things replaced already: Vacumm lines, cleaned throttle body and new gasket, new fuel filter, new fuel pressure regulator, new fuel pump relay, ran two bottles of fuel system cleaner through it, and checked fuel pressure.
Honestly, it is REALLY starting piss me off.

[kOMPRESSOR]

Idle surges?

[calin666]

Kind of sort of, if that makes sense.
It's almost like the throttle is sticking in a way, but it is not the gas pedal, or the throttle cable. You give it gas, and the RPM's jump to about 2000, sit there for a few seconds, then slowly over about 6 seconds, come back down to normal (about 800 RPM). And, it only does it when the car is cold. Once the temp comes up, it stops doing that. It's almost like something is sticking.

[kOMPRESSOR]

This could help. :)

http://www.mitsubishi-forums.com/t41125-po...advice-ever.htm

[pwee05]

I am trying to pull the IAC out of my trottle body, but the screws won't come out. I am worried about stripping the damn thing. And yes, I am turning it the right direction.
Is it normal for the screw to be that difficult to remove? I am thinking I am going to have to drill it out, and tap it.
Any advice?
[right][snapback]206716[/snapback][/right]

they have blue loctite on them from the factory. you have to press into them real hard as you turn or you will strip them. or set the screwdriver in the screw and then smack it a couple times with a hammer first

[calin666]

Uhhhh.... thanks for the advice BRM, but, like, that kind of doesn't help my problem.

Cool pwee. That explains the feeling of the screw then, I think you know what I am talking about. I think I have an impact driver I can use, or at the very least, a socket and a 6" extension I can pound on with a hammer. I think I am going to have to wait a week or two thogh, I bought the last throtte body gasket at my Local Auto Parts Store (LAPS).
I am about ready to take the stupid thing to the dealership and let them fix it. lol

[jonbonazza]

Also, this is a long shot, and likely not your prob, but thought I would throw it out there anyway. If any part of the intake is loose, like the filter to pipe connection or anything that will create a vacuum leak and cause your prob.

[pwee05]

that would be a possibility except the 420a uses a MAP sensor on the intake manifold, not a MAF sensor on the intake system.

calin, I haven't bought a paper gasket in years. As long as the original one is "mostly" intact you can cut a new one out of gasket paper. Use the green paper and you can find it at any parts store. save some time and money :thumbsup:

[jonbonazza]

that would be a possibility except the 420a uses a MAP sensor on the intake manifold, not a MAF sensor on the intake system.

Yea, but wouldnt a leaky intake STILL cause a vacuum leak? As far as I know a vacuume leak has nothing to do with the MAF or MAP.

[pwee05]

typically a vacuum leak happens after the throttle body or at a hose or pipe that connects to the intake manifold. on a 420a car you could remove the entire intake system and still be able to drive around fine.

on a 4g63 car if you remove the intake system:
1. the turbo wont work
2. the car will go insane because the MAF isn't metering any intake charge but the throttle is letting air in

[jonbonazza]

Hmm.. That is true I didn't think of that.

[calin666]

You know, mentioning that makes me think about something I noticed.
At the point that the throttle body attaches to the intake manifold, around that area on the top of the intake, there seemed to be some black carbon, like soot almost. I never actually noticed it before, untill this weekend, when I pulled the throttle body off to try and clean the IAC. Could that mean a leaky seal around the throttle body to intake, having to do with the gasket? If so I will just get some gasket material and try and make a better seal.
Or I could use JB Weld. lol

[pwee05]

it might be the EGR pipe on the back of the intake that's leaking

[waynerwats]

typically a vacuum leak happens after the throttle body or at a hose or pipe that connects to the intake manifold.  on a 420a car you could remove the entire intake system and still be able to drive around fine.
[right][snapback]207589[/snapback][/right]

Ive done that and yes my car ran fine.

[dannwo1]

This is one of the most usefull tools you can get. I've used mine more times than I could remember. What you do is, insert the correct bit, put it on the screw head and hit the top of it with a hammer and it simultaneously pushes and twists about an 8th turn. I think it's called an impact extractor, but you can pick them up almost anywhere.

Attached File(s)

 impactdriver.jpg ( 62.6K ) Number of downloads: 19

 

[jonbonazza]

Wow that tool does look handy. I am gonna pick one up I think. :P How much did it cost you?

[dannwo1]

I got it from Home Depot. It was like 25$. Definately well worth it. But I see them everywhere.