Throttle body problem, now a code

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 12:57 pm

I was using a 2000 ATX throttle body on my car. Recently. I swapped over the "shaft" part and the plate from my old MTX TB to this one, thus making it damn near identical to my original stock TB. The pedal has the right play in it so it feels normal and I don't bog at full throttle, it actually accelerates. It's nice. Now on to the problems.

When I'm accelerating, in between gears the RPMs don't drop. They'll stay right where I left off. It's crazy annoying. Sometimes it'll drive totally normal, but after 4-5 minutes, it starts doing this and the car never gets back down below like 2000 RPMs. Same thing happens when I stop. If I coast up to a light or am braking, the RPMs will go down, but once I push the clutch in it will fly up to 3-4k and just set there. By the time I'm ready to take off from the light or stop sign, it's either just getting back to like 1500 RPMs or is still above 2k. It's loud and annoying and I don't like that the car isn't driving normal. Makes it a pain to do anything.

So not even 30 minutes ago I was out there messing with the TB, etc... and now it idles at ~1600. I can't get it to come down. The idle screw is all the way down. If I start backing it out at all the idle goes up. Also, right when I start the car, it flies to 3000 RPMs and sets there for close to 5 seconds. After I did all this messing, flipping the throttle plate back and forth, etc.... I just re-assembled it all as it was and started it. Now the idle STILL sets at ~1750 or so AND I've got a P0122. WTF is going on? Is there another way to control the idle? Why is the throttle "sticking?"

esteinmaier · Post by **esteinmaier** » Thu May 06, 2010 1:10 pm

You don't control the idle. The ECU does, and that's why there's an IAC. You have a vacuum leak, plain and simple.

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 1:18 pm

Zomg. Now to find it? At least I know what I'm looking for. Sounds like we found Tam's problem too. What should I be listening for?

Post by **occasional demons** » Thu May 06, 2010 1:23 pm

Check your bellows tube for cracks, and tightness. Any other vacuum lines that may have been removed/disturbed by removing the TB. Turn the screw back in a little. It may be why you have the low TPS voltage code. You can also try spraying carb cleaner around the hoses etc to find the leak. If all that fails, the IAC motor may not be seating the pintle, or there is something stuck on the seat.

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 1:49 pm

Thanks fellas. I'm gonna walk back out there and make sure the two sensors are attached to the TB fully and whatnot. I took a video of me starting it and then walking over to the engine and listening, but my ma's computer isn't recognizing it as a video file so it'll have to wait til tonight when I can get on my computer. I hate always messing with this tiny crap.

glasswars · Post by **glasswars** » Thu May 06, 2010 2:57 pm

Check the hose going from the valve cover to the manifold.. sounds like it's that one. I remember I took it off one day to clean and forgot to put it back in, turned the car on, and the RPM's shot up to 4k like you said..

heydockyle · Post by **heydockyle** » Thu May 06, 2010 3:06 pm

Yea, PCV valve line will cause a vac leak.

When I had the 2.0 in the 1gn the valve part broke and I was in race mode when idling and in between gears.

srtgtr34 · Post by **srtgtr34** » Thu May 06, 2010 3:07 pm

glasswars wrote:Check the hose going from the valve cover to the manifold.. sounds like it's that one. I remember I took it off one day to clean and forgot to put it back in, turned the car on, and the RPM's shot up to 4k like you said..

Does that tube even need to be used?

On my injen cai there isn't even a nipple for it, while my aem one does.. I am currently using the aem cai without that hose and I don't notice any differences..

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 3:11 pm

^ Anthony, are you talking about the one that comes from the BACK of the VC? Because I've got that run into my airbox. All bone-stock. I've seen people get rid of that line completely and put a breather filter on it.

OR

Were you talking about the one that comes out of the right side of the VC? I'm a newb so Idk what that one is called. I can see one of the threads showing on it, but it wont go any further into the VC. It sorta just. . . sets there.

srtgtr34 · Post by **srtgtr34** » Thu May 06, 2010 3:21 pm

Its the one on the right side of the vc.

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 3:25 pm

I'm uploading pictures now. I think I've found 2 things that could or could not have any effect:

First off, the PCV? This is how mine sets. I can't really get it to move further into the VC

Secondly, this never has been, as far as I remember, plugged or capped since I've owned the car, but should it be? I'ma newb.

No cracks in the bellows tube. No other lines have been messed with, but I checked all of them and they are fine / secure.

heydockyle · Post by **heydockyle** » Thu May 06, 2010 3:34 pm

Yes, that is plugged by factory. Yes that is the PCV. Did you check the line all the way down to the intake?

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 3:36 pm

^ Yup, I took that whole line between the two off and made sure everything was clear and good and put it back on. It's all set. So that little plug thing I showed is missing something, or is it fine as-is? Would that even cause an issue at all?

Danteneon · Post by **Danteneon** » Thu May 06, 2010 3:59 pm

I'm putting my money on a dirty IAC. Take it off, clean with non-chlorinated (SP) brake clean, and re-install.

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 4:06 pm

If the IAC is the one that sits on top of the TB, I took it off and cleaned it on Monday. I just had both the sensors off earlier and they are fine and mounted up tight. Hell, that IAC is the whole reason I got a new TB back in January or so anyway

Anyway, I just popped off my oil / goo covered VC, and it checks out. Gaskets are fine, etc... PCV isn't supposed to go all the way in?

On a side note, the bolt in the lower left side of the VC that holds it on is snapped. It just spins freely. It's not loose or leaking there I'm sure, but it's just something I found.

What am I leaving out guys? I hate being a newb and I drive over 50 miles a day. Even moar so this weekend since it's a work weekend.

hul kogan · Post by **hul kogan** » Thu May 06, 2010 4:12 pm

If all your lines are dandy, then I would look at the IAC as Dante noted. Is it properly seated? If so, trying pulling it off and cleaning it.

What you pointed out is fine. It doesn't need a plug or anything.

EDIT: You ninja'ed me.

hul kogan · Post by **hul kogan** » Thu May 06, 2010 4:15 pm

Hmm, have you checked the lines back at the brake booster for leaks? There is a small cylinder (I believe it is some sort of check valve or diverter) that can pop loose and leave you with a leak. Check that out.

Danteneon · Post by **Danteneon** » Thu May 06, 2010 4:18 pm

When you say you cleaned the IAC, how did you do it? What did you use?

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 4:30 pm

I uhh whiped it down and got all the "grime" that was built up in it.

Chris, where is this booster you speak of? I don't hear any hissing or anything, which is why this drives me nuts. I'm like a deer in the headlights looking in there. That, and my back is on fire.

Danteneon · Post by **Danteneon** » Thu May 06, 2010 4:36 pm

The pintle and the seat need to be free of debris. Try to pull back the pintle and use a toothbrush to get the seat as clean as possible. I've had to do this to three different Neons now.

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 4:42 pm

Is the pintle the long metal part?

hul kogan · Post by **hul kogan** » Thu May 06, 2010 4:59 pm

Standing in front of the engine, it will be in the top right. It is the black cylinder that is on the firewall right in front of the driver. Check out the vac lines/connections that go into it.

Danteneon · Post by **Danteneon** » Thu May 06, 2010 5:17 pm

FAC3L3SS wrote:Is the pintle the long metal part?

It's actually the cone shaped part on the end of the shaft with the spring on it. When it is seated, it's hard to see since it is kinda under the metal of the IAC.

Mind you, the description I'm going by is for a 01 and up type. Not sure if the 00 looks the same.

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 6:59 pm

Lol I'm not either. I'm painting windows right now (yes. windows.) so I've not worked on it for a few minutes. I'm gonna dive back in and clean both sensors up and tackle where Chris is telling me where to look. Idk what else to do. I don't wanna drive it like this til Monday since that's the only chance I've got to go check it out with my mechanic.

heydockyle · Post by **heydockyle** » Thu May 06, 2010 7:01 pm

Move to PA so when this happens I can help you.

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 7:02 pm

Bah! Ryan might come up here in a week or so. Tag along with him, would ya?

heydockyle · Post by **heydockyle** » Thu May 06, 2010 7:07 pm

Ryan don't like me lol.

Let me know when, and I shall see what I can do. I can come up in the Big Red Racecar, if it don't blow up on the way there.

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 8:27 pm

Welp, I need some help / advice NOW rofl.

I followed every vacuum hose as far as I can. Granted I'm a n00b, but they seem fine. They are all connected, and I think I found what Chris was talking about, and everything seems fine on it. Idk what's left to check? It's still flippin out. Both sensors were taken off again, all surfaces were clean and smooth and they are mounted tight. No gaps or debris.

FAC3L3SS · Post by **FAC3L3SS** » Thu May 06, 2010 9:37 pm

Maybe a vac leak is right? I was leaning toward it not being that, but I've:

1. Corrected my TB plate problem (had it in wrong)
2. Cleaned IAC THOROUGHLY
3. " " TPS
4. ????

I got the throttle bracket thing to actually hit the idle screw. This last time, when I started it, it actually idled at ~1000 for like 1-2 seconds then shot back up to 3.5 ish and then leveled off back at ~2k. Where teh eff is this leak?

heydockyle · Post by **heydockyle** » Thu May 06, 2010 10:11 pm

The brake booster would be the big round black thing to the right of where the brake fluid goes in. It has the vac line that everyone uses to suck up the seafoam. Check them.