Need help, changed plugs, now revving high

[vertigasen]

I posted this originally in the wrong area, was in a freaking hurry, but here is the lowdown...

I just changed my plugs, nothing new there, but this time, when I started it afterwards it rev'd to 3k and hung there. There was also a loud, what seemed to be a vaccum leak sound. Never had that happen before. I killed it, and started it back up, back to 3k, but no vacuum sound. After a minute it drops to 2k, but if I hit the gas, it revs up to 3k again and stays at that rpm for a minute then right back to 2k. I did unplug the TPS while I was doing it, but the battery was disconnected. I have reset the comp twice. What else do I need to try? Is the TPS dorked up?

I have checked all the lines, I dont get any error codes, it just stays rev'd up. Nothing with the TB was changed so I kinda ruled that out. This 45 min job is now turning into a 5 hour fix. Any help is welcome.

 

[sgarlic]

Still sounds like you have a vacuum hose disconnected. I'd double check all the hoses.. if all you did was unplug the connector from the TPS, you shouldn't need to make any adjustments.

 

[Nater]

I would also check to see if you have a vacuum line disconnected. On the off chance, is there anything in the throttle body that's keeping it open?

 

[1LowGT]

sometimes when i pull off the intake tube i accidentally pull out the hose on the other side of the engine,look over the whole thing.

 

[vertigasen]

Ok, I checked everything, no hoses that I can see. I took off pretty much everything and rechecked it, but nothing. I also checked the TB to make sure nothing is obstructing it, but it is fine. It still instantly revs to about 3200 rpms, then drops to about 2300-2400. If I touch the gas, it is right back at 3200. When I kill it when it is at 2300 rpms, there is a weird hiss sound that comes from the intake while shuts down. While it is running, it seems to be fine other than the high rpms. I am running out of places to check. Any sugguestions?

 

[silv00]

This may or not be it, but it only takes 5 minutes to do, so I'd check out your Idle Air Control valve if I were you. I had to the same issue. I pulled the IAC, sprayed the bejesus out of it with intake cleaner, feekin a, it worked. No more idle problem.

Here is the article I used: http://www.muscularmustangs.com/iac.php

 

[BooWFO]

First calm down. It's prolly something simple step back have a icy cold beverage (alcohic if yor old enough) and go back out with a calm cool head and I bet you find it.
OK. Now let's go over it in slow motion. You did plugs and you unpluged the TPS. ??? anyways take the inlet tube, Maf and air cleaner back outta the way. See anything?
Check where the IAC and Vac lines run nice and tight? is there anything catching the throttle cables? ok slowly put it all back together. remember, to re connect the 2 rubber lines to the intake, the MAF wires, ok. now try starting it does it do the samething? If so
have you checked the TPS voltage? you said you unplugged it did you remove it? If so break out the trusty multimeter and set the voltage. Key on engine off bottom 2 wires on TPS should be as close to 1vdc as you can get without going over 1vdc. I like mine at .998VDC. OK now with meter still in tighten the screw back down making sure the TPS doesn't move too much remember less than 1vdc. OK now I've found on my car after this I need to reset the computer again not sure why but if I don't it idles all outta wack. no reconnect and start the car is all better?
If not try removing the IAC altogether and pluging the holes. Did that fix it?
Ok now if none of that did it and your 100% sure all connections are tight. come back let us know and hopefully someone else will have some advice.
I'm thinking of a few other's I'll go look at my stock stuff.

 

[vertigasen]

First calm down. It's prolly something simple step back have a icy cold beverage (alcohic if yor old enough) and go back out with a calm cool head and I bet you find it.
OK. Now let's go over it in slow motion. You did plugs and you unpluged the TPS. ??? anyways take the inlet tube, Maf and air cleaner back outta the way. See anything?
Check where the IAC and Vac lines run nice and tight? is there anything catching the throttle cables? ok slowly put it all back together. remember, to re connect the 2 rubber lines to the intake, the MAF wires, ok. now try starting it does it do the samething? If so
have you checked the TPS voltage? you said you unplugged it did you remove it? If so break out the trusty multimeter and set the voltage. Key on engine off bottom 2 wires on TPS should be as close to 1vdc as you can get without going over 1vdc. I like mine at .998VDC. OK now with meter still in tighten the screw back down making sure the TPS doesn't move too much remember less than 1vdc. OK now I've found on my car after this I need to reset the computer again not sure why but if I don't it idles all outta wack. no reconnect and start the car is all better?
If not try removing the IAC altogether and pluging the holes. Did that fix it?
Ok now if none of that did it and your 100% sure all connections are tight. come back let us know and hopefully someone else will have some advice.
I'm thinking of a few other's I'll go look at my stock stuff.

Yes, I had to unplug the TPS because the damn cable for it came right up in front of one of my COPs. I would rather unplug it than break it. I did check the the ICA, I removed it, sprayed it, and put it back. I then removed the ICA hose from the CAI and blocked it, didnt change a thing. I checked the throttle cable and the butterfly, it is closed and no obstructions. I checked the TPS voltage, but I think my multimeter might be screwed. I check it, one time it was 1.012, the next it was 1.3, next it was .8. Will buy a new one in the morning, and try it from there.

 

[vertigasen]

After having to go to work all night, and some decent sleep today, I'm back at it.

I removed the IAC, sprayed the ***** out of it, and put it back. I also checked the TPS and it was pretty close, .96, moved it around and it is at .99 now. After I put the IAC back and started it, it started out at 2300 then dropped to about 800, then after about 30-45 seconds and they white smoke from the exhaust stopped, it was right back to 2200. I covered the inlet to the IAC, but that didnt change anyting. It would suck, rpms stayed the same, then when I pulled back, it would drop for just a second then right back to 2200. And still, if I touch the gas, it jumps up to right around 3000 hovers there for 5 seconds then drops back to 22/2300.

I checked all hoses, and I cant find a leak anywhere. There are no vacuum sounds from anywhere, and it seems to be running just fine, or at least it sounds good anyway other than the high rpms. Any other guesses?

The fitting around the other hose connected to the intake seems a little loose, I played with it while the car was running but it didnt change anything. I am in the process of replacing or fixing it. Dont think that is the problem, but lets see what you guys think.

Thx

 

[SilverBullet00]

MY car has gasped for air like that since I got it, I know how bad it sucks! I cant find anything causing it either. I recently replaced my cracked lower intake and it didnt gasp for about 2 minutes, then it did and still does.