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Old 04-13-2009, 02:02 PM   #1
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Help - New throttle body weird behavior.

Ok, I have installed the billetflow throttle body on the 2.2 kb I just installed. I was fine with the idea of my idle hanging around 1000 when driving. However, here is what I am experiencing.

When driving around, the car will randomly pick an rpm to hang at. This seems to be dependent on how fast I am driving. Some times, it will decide to hang at 2k. It has hung as high as 3k/3500 as well. It doesn't matter the gear or whether I am cruising on the interstate or driving on side streets. In fact, it almost acts as a cruise control on the interstate. I can hit the clutch and the rpms will jump. If I blip the throttle, it will drop down. Or if I accelerate before hitting the clutch to stop, it will idle down to the 1k/1250 point.

I really think this is a mechanical issue with the cable hanging somewhere. I've checked the TPS voltage and have it set at .92-.94. Forgot which one. The TPS is a brand new unit as well since I forgot to take my stocker off the eaton when I sold it.

I've tried opening the throttle body by hand, both cold and hot right after driving and I feel no resistance or hang ups. I can't see where the throttle cable could be hanging up...but that is the only option I can think of right now.

So, does anyone else have any thoughts? I have no CEL's....no codes, no nothing. Just this horrible hanging idle. I working on getting an accufab TB to test and see if it is just a pile of turd TB.
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Old 04-13-2009, 08:49 PM   #2
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Re: Help - New throttle body weird behavior.

Im going through the same thing right now. Granted mines not a Cobra with a KB.
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Old 04-13-2009, 08:50 PM   #3
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Re: Help - New throttle body weird behavior.

we can try that other TB when ever you want to
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Old 04-13-2009, 09:10 PM   #4
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Re: Help - New throttle body weird behavior.

Hm...mine isn't installed yet so I'm no help...but I'm not sure what to tell you. I will tell you this...when you get it figured out go ahead and drill a hold and put a pin in to keep the throttle cable from backing off the throttle body, seem to see this problem coming up here often too.
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Old 04-13-2009, 10:30 PM   #5
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Re: Help - New throttle body weird behavior.

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Originally Posted by hottcobra View Post
we can try that other TB when ever you want to
I'm going to trace the throttle cable this week since I need to get under the dash to install my wideband that will be here soon anyhow....and if I Can't find the hang up I'm going to test out that other TB this weekend.
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Old 04-13-2009, 11:02 PM   #6
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Re: Help - New throttle body weird behavior.

do you guys not employ a idle air bypass?

you know the transfer function is probably off now that you've added a larger TB and Blower..
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Old 04-13-2009, 11:07 PM   #7
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Re: Help - New throttle body weird behavior.

This is with a brand new custom tune for the blower swap. I haven't just bolted this on and run with it. The high idle didn't start until the third or forth day I drove the car after the swap. I've done some "on the street" data logs for my tuner to check out to get his impressions...just haven't heard back from him since I posted them last night.

And yes, we do employ an IAC valve....and so far 2 people have suggested I clean mine as it could be the culprit. I am going to clean it out as best I Can tomorrow and see what happens.

I just figured I would see if anyone else had any ideas of where to look. Sounds like you may be a third person telling me to check the IAC valve....3 can't be a fluke.
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Old 04-14-2009, 08:35 AM   #8
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Re: Help - New throttle body weird behavior.

usually if an idle bypass valve is bad it wont idle it will just die and only do it in neutral.

you should know if the throttle body is hanging, the gas petal wont come back up all the way
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Old 04-14-2009, 09:51 AM   #9
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Re: Help - New throttle body weird behavior.

The gas pedal is under the dash, I can't see it...and pulling up on it with my feet don't do squat.

As for the IAC only making it not idle, I did some searching yesterday and there are 2 possible conditions...you either won't idle well at all and/or stall out...or it will idle really high.

I'm going to try the cleaning thing tonight and see what happens.
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Old 04-15-2009, 10:18 AM   #10
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Re: Help - New throttle body weird behavior.

Well, I took my IAC off last night to clean it and tested it out a little bit. I turned the key on, engine off, and the plunger inside the IAC never moved at all. Cycled it several times and never once did the plunger move. I believe my IAC valve may be shot. I believe that is problem #1. I'll replace that and see how things behave after.
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Old 04-15-2009, 11:01 AM   #11
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Re: Help - New throttle body weird behavior.

yea when mine went (it seems to act up when its colder out) mine just wouldnt idle
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Old 04-20-2009, 10:36 AM   #12
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Re: Help - New throttle body weird behavior.

Ok, just some updates.

I installed the new IAC and still had the same problems...but at least the IAC is working again.

I installed a secondary return spring and the high hanging idle when driving is now gone. It still hangs at 1250-1500. I'm going to go through the calibration stuff again with the new return spring and see what happens.

I also have my new tune updates and my wideband is hooked up.....so i'll be doing some logging again tomorrow.
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Old 04-20-2009, 11:51 AM   #13
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Re: Help - New throttle body weird behavior.

i know on my 01 v6 ( as with many v6s for some reason) the idle decay rate was high and it would hang up higher and slowly come down at time when I would push in the clutch~ just a thought on something to check. It can be edited in the tune to change how it works
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Old 04-20-2009, 11:55 AM   #14
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Re: Help - New throttle body weird behavior.

Well, after 15 mins of sitting in the driveway idling, it didn't come down at all.

I remember the settings in the tune that can be changed from looking over the shoulder of my other tuner....I'm going to data log the behavior and have the new guy mess with it. That all comes tomorrow though...need to get my interior back together first.
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Old 04-21-2009, 11:29 PM   #15
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Re: Help - New throttle body weird behavior.

Just checking to see if you got it right yet, i hope so.
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Old 04-22-2009, 08:57 AM   #16
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Re: Help - New throttle body weird behavior.

No. The 3, 4, and 5k idle is gone with the secondary return spring, but the 1200-1500 idle is still there. I need to do some configuring on the TB tonight probably and see if I can't stop that.
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Old 04-22-2009, 08:58 AM   #17
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Re: Help - New throttle body weird behavior.

how the datalogging go?
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Old 04-22-2009, 09:52 AM   #18
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Re: Help - New throttle body weird behavior.

It didn't. Lynn is pretty sick right now so I couldn't use her laptop. I went to Louis' to get his, and forgot the damn cable to hook the gauge to the XCal. So, I'm going to do the logging tonight after I mess with the TB.
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Old 04-22-2009, 11:21 AM   #19
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Re: Help - New throttle body weird behavior.

and you still haven't called billitflow?
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Old 04-22-2009, 11:24 AM   #20
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Re: Help - New throttle body weird behavior.

No. However, I do have a PM out to him.
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Old 04-22-2009, 11:27 AM   #21
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Re: Help - New throttle body weird behavior.

also wanted to tell you that you really really need tires. When you nailed it last night I only had to hold 1/2 throttle to keep up with you, you were spinning so bad.
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Old 04-22-2009, 11:34 AM   #22
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Re: Help - New throttle body weird behavior.

Yeah, but I did notice that my tires do make a nice loud screech when spinning. lol I just wanted to see how high the boost would go in the cool air. Went past the 18 psi mark....
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Old 04-22-2009, 11:37 AM   #23
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Re: Help - New throttle body weird behavior.

I have noticed that your car stays pretty straight while spinning. that's a good thing
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Old 04-22-2009, 11:40 AM   #24
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Re: Help - New throttle body weird behavior.

Hopefully you get a fix soon!


Also, when you say it was only 1/2 throttle were you in the GT? (hottcobra)
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Old 04-22-2009, 11:41 AM   #25
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Re: Help - New throttle body weird behavior.

Yes, he was. I was doing about 80, he was doing probably 30....and kept pace with me.
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Old 04-22-2009, 11:44 AM   #26
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Re: Help - New throttle body weird behavior.

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Yes, he was. I was doing about 80, he was doing probably 30....and kept pace with me.
Don't worry I understand how KB and Whipple blowers make a new meaning for traction. You would have to run around on slicks to hook up.
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Old 04-22-2009, 11:44 AM   #27
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Re: Help - New throttle body weird behavior.

Yeah, my $90 sumitomo's aren't getting the job done. lol
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Old 04-22-2009, 11:46 AM   #28
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Re: Help - New throttle body weird behavior.

Also, something I wasn't clear on. Have you had a tune since the TB install?
If not it completely makes sense, but I would still be weary on the fix. (epically since the springs made a difference)


EDIT: so much for spell check, it would spell especially.
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Old 04-22-2009, 11:51 AM   #29
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Re: Help - New throttle body weird behavior.

sure blame it on spell check
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Old 04-22-2009, 11:53 AM   #30
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Re: Help - New throttle body weird behavior.

wned:
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Old 04-22-2009, 11:55 AM   #31
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Re: Help - New throttle body weird behavior.

Quote:
Originally Posted by SaleenFiend View Post
Also, something I wasn't clear on. Have you had a tune since the TB install?
If not it completely makes sense, but I would still be weary on the fix. (epically since the springs made a difference)


EDIT: so much for spell check, it would spell especially.
Yes, it has had new tunes since the TB install. The TB went on with the KB, so it was all included in the new tune. Now, there are tune issues as I am current running at least 10.0:1 A/F right now. I say at least because when I floor it, my wide band goes to 10.0 instantly and holds there through the whole RPM band...so I am sure it is less than 10.0.

I am going to go through and configure the TB by adjusting the screw until the car won't start on it's own...then go through the steps needed to get the car to start. That "should" fix my current 1000-1500 hanging idle that the billetflow is notorious for. The spring fixed the 3/4/5k hanging idle from the TB sticking open when driving...even though there are no sticking points in the TB. Weird anyhow.
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Old 04-22-2009, 11:57 AM   #32
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Re: Help - New throttle body weird behavior.

I think that's a mono blade think
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Old 04-22-2009, 11:57 AM   #33
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Re: Help - New throttle body weird behavior.

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Yes, it has had new tunes since the TB install. The TB went on with the KB, so it was all included in the new tune. Now, there are tune issues as I am current running at least 10.0:1 A/F right now. I say at least because when I floor it, my wide band goes to 10.0 instantly and holds there through the whole RPM band...so I am sure it is less than 10.0.

I am going to go through and configure the TB by adjusting the screw until the car won't start on it's own...then go through the steps needed to get the car to start. That "should" fix my current 1000-1500 hanging idle that the billetflow is notorious for. The spring fixed the 3/4/5k hanging idle from the TB sticking open when driving...even though there are no sticking points in the TB. Weird anyhow.
Yea, it always is, but it will turn out to be something simple to fix hard to locate. (Isn't that always the case?)


10.0:1 lean? correct?
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Old 04-22-2009, 11:58 AM   #34
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Re: Help - New throttle body weird behavior.

Quote:
Originally Posted by hottcobra View Post
I think that's a mono blade think
^^^ Accufabs do also have the issue I am having right now. If I can't fix it, I can live with it....but I don't think I Can live with this secondary spring...it makes the gas pedal way too stiff
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Old 04-22-2009, 12:08 PM   #35
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Re: Help - New throttle body weird behavior.

donno. gonna have to wait and see what billitflow has to say
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