Car not running quite right

[JD]

So last night I'm heading home and I decide to have fun with Greg in the other lane from a light. I go through first and wind it out to about 6K rpm. I pull for second and when it gets up to ~4500 the car just stumbles, then starts pulling again to 6500. We stop for another light and I decide to try it again, going through first fine. I shift to second and when I get to 5500, the car has this major hesitation, then starts pulling again to redline. Tried it one more time close to home and it didn't do it (WTF?!?!).

I've been having driveability issues ever since I went to dumps. When I stop at a light the idle hangs up at 1200. After a couple of seconds of sitting idling it then comes down to 800 where it belongs (the hanging is not a big deal). Sometimes it stays there and the idle is solid as a rock. Problem is, sometimes it stalls out completely, and sometimes it hunts between 800 and stalling. When it's not stalling out, the idle is somewhat rough compared to what it used to be (smooth as glass).

I wonder whether it's two different causes to two different problems, or maybe it's the same thing causing both.:shrug: -

1- stumble at WOT up high in the revs (maybe IMRC's sticking)

2- idle hunt/surge (IAC, newish plugs fouled, something else).

Anybody have any ideas? I'm doing the IMRC's this weekend (finally) and will see if that helps with the WOT stumble, but that wouldn't affect the idle issue, so I'm thinking that's not the only problem. :shrug:

[Greg Kulbick]

My idle doesn't come down right away either since I put my dumps on. If I put the clutch in and roll up to a light say, and I'm slowing down, the revs drop to about 1000 but hang there until I come to a stop then they drop to about 750.

[redmach1]

Originally posted by FL Zinc
My idle doesn't come down right away either since I put my dumps on. If I put the clutch in and roll up to a light say, and I'm slowing down, the revs drop to about 1000 but hang there until I come to a stop then they drop to about 750.

Greg, that is normal. JD, check for a vacuum leak. If not, I would clean the idle speed motor when you do the IMRC. Sounds like they could be sticking.

[Greg Kulbick]

It didn't do it as bad before I put the dumps on.

[hobbstc]

JD, you're cleaning the IMRCs without me? j/k Good luck with that, then you can help me do mine later. Did you reset the computer after you went to dumps? Maybe tha has something to do with it, or like posted above check the IAS.

[JD]

OK, thanks fellas. I'll check the IAS (wherever that is- gonna go to the Haynes manual for that one) this weekend when I do the IMRCs. We'll see if that helps.

Tom, no I didn't reset the computer after going to dumps. I'll try that too. PM me your number if you're going to be free on Sunday. I'll be doing the IMRC's then if you still want in.

[hobbstc]

The IAS (mistakenly called IAC) is the silver round cylinderon the side of the intake that controls the idel speed. They get junked up and start going bad after a while. Its like a $60 part I think. Its a flat silver object with a tube going into the top, IIRC.

[Spinner]

seafoam

[Bryan02TA]

clean the IMRC's you lazy bastard........it's night and day :D

[JD]

Originally posted by Spinner
seafoam

Huh?


Originally posted by 97_Stang
clean the IMRC's you lazy bastard........it's night and day :D

I know, I know...:lol: Hey Mr. Experienced, any chance you're available to help?

[hobbstc]

Can't make it this weekend. Parents are in town.

[brandboZ28]

Originally posted by Spinner
seafoam Spinner, correct me if Im wrong but seafoam is something that people run through their motor like a injector cleaner but it cleans more than just the injectors. It cleans up all the carbon buildup on your valves, pistons, and probably you IMRC flapper thingys. I dont know very much about using it but there are some guys on the CZ28.com board that swear by it. I can do some research for you if you would like.:D

Oh, I helped Bryan with his IMRC's and if you need a hand, I got yo back.

[JD]

Originally posted by brandboZ28
Spinner, correct me if Im wrong but seafoam is something that people run through their motor like a injector cleaner but it cleans more than just the injectors. It cleans up all the carbon buildup on your valves, pistons, and probably you IMRC flapper thingys. I dont know very much about using it but there are some guys on the CZ28.com board that swear by it. I can do some research for you if you would like.:D

Oh, I helped Bryan with his IMRC's and if you need a hand, I got yo back.

I've never been one to put anything in the tank that wasn't either fuel or injector cleaner, so I think I'll wait to try that if I continue to have issues with this.

I certainly would appreciate any help available cleaning my "...flapper thingys":lol: . You always kill me Bo.
Aren't you going to be busy helping someone else out this weekend? I thought I read that Greg was going to be doing his K, and that Mark still needed your help on that cam swap (or whatever it is that you've been helping him with- I forget).


Anyhow, I'm gonna do this on Sunday if you're free.

[slmdLS1]

you're right on the seafoam bo....ive used it, but it supposedly fouls your plugs if you use it a lot...its like $5 @ NAPA

[Tally TransAm]

seafoam doesnt go in your take, you either get spray or bottle

spray goes through your tb and the bottle goes through a vacuum line (like the brake booster)

[redmach1]

You are all right. It can be used a multitude of ways, but you can put it in your gas tank. It was originally designed for boats to keep fuel from going bad and to prevent buildup of shit in the lines and carbs.

[Bryan02TA]

I'll see what's goin on sunday, maybe i can lend a helping hand. Give me a call before you start JD, 528-1344