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 Post subject: Unintended Acceleration
PostPosted: Tue Sep 16, 2014 5:06 pm 
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I got a doozy for you guys this time. I had replaced my IAC a couple of days ago after it was acting up. I had the guys at O'Reilly read the codes, and it came back as a bad IAC(high RPM). It was the only code, and I replaced it right there in the lot. She acted fine until a while ago. I just went out to grab a bite to eat, and leaving out she acted fairly normal on start up. Until I shifted into drive, took my foot off the brake, and she Leaped forward. Got on the highway, and Without touching the accelerator she managed to get all the way up to 50mph all on her own. Getting her to slow down was a pain, but I managed to get home. I have no SES light on, and now when I start her up she goes from 2k and climbs up to 3k. I had shut her off before she got any higher. So am I looking at a dud IAC part, or is this the TPS? Any idea guys? Thanks in advance.

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PostPosted: Tue Sep 16, 2014 5:13 pm 
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Is the throttle body stuck open in a certain position? Might be gummed up.

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PostPosted: Tue Sep 16, 2014 5:21 pm 
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No, I just checked it. Whenever I move the throttle from behind the Body it opens, and returns to closed normally.

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PostPosted: Wed Sep 17, 2014 7:18 am 
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The throttle body can fail. I fought that one for several years replacing IAC (at least 4), TPS (probably 10), O2 sensor (probably 10) and MAFS (2). The only reason I got it fixed is a "mechanic" that fixes cars that fail emissions didn't bolt down the TB to the Plenum all the way and the coolant eroded the base of the TB. - BC


EDIT: Make sure the floor mat or the throttle cable aren't sticking first. - BC

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PostPosted: Wed Sep 17, 2014 9:53 am 
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Unplug the IAC, start the car, plug the IAC back in. I've had to do that a couple times in the past.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers and 10" Subs, 1300 watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights


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PostPosted: Wed Sep 17, 2014 4:56 pm 
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J Wikoff wrote:
Unplug the IAC, start the car, plug the IAC back in. I've had to do that a couple times in the past.

I have been told by "mechanics" (the term can be used loosely) unplugging the IAC while the electrical power is on can damage the IAC. I have no way of knowing if that is an accurate statement or not. - BC

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PostPosted: Wed Sep 17, 2014 5:03 pm 
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Well, you're not unplugging it with power on. Plugging it back in, yes. It's worked on my Bonneville and my wife's old Grand Am when suddenly idleing higher than normal.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers and 10" Subs, 1300 watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights


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PostPosted: Thu Sep 18, 2014 2:49 am 
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Okay, my car is acting very strange. I replaced the TPS, IAC is only a couple days old, and upon starting it recently the idle was crazy. Tach went to 3k, down to near stall, back up to 3K, and hung around 2k with lots of spitting, and sputtering. I did all that was suggested regarding the IAC, and still doing the same thing. I took off the Throttle body, and it was fairly dirty, but wasn't messing with the action of the valve. I cleaned it thoroughly though. Gasket wasn't broken on the Throttle body either. Still no SES light on the dash. Could it be the EGR Valve by chance? I haven't checked that at all.

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PostPosted: Thu Sep 18, 2014 6:57 am 
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Pretty obvious, but could be you need to reset PCM by unplugging the battery cable for awhile or check all the ground busses.

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PostPosted: Thu Sep 18, 2014 7:27 am 
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After you reset the PCM, if the car is still acting "crazy", make sure you have no vacuum leaks. If you don't have any vacuum leaks, then there is a good possibility your throttle body has failed. You will not, at least that's been my experience, be able to tell by a visual inspection. I would think a bad EGR could cause your problem.

If it is a throttle body. I'd recommend getting it from Andrew - harrofreak00 (Bonnevillesunlimited.com).

part information:

http://www.gmpartsdirect.com/catalog/ NA 24507226
http://www.ebay.com/dsc/6000/i.html?LH_ ... =12&_rdc=2
frameset.cfm

Supercharger 24507240
http://www.ebay.com/dsc/6000/i.html?LH_ ... =12&_rdc=2

- BC

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2017 Hyundai Santa Fe Sport ..... 1992 Bonneville SSE 1SB 170 HP L27 4T60E retired/sold to MattStrike ..... 2005 Bonneville SE 1SC 205 HP L36 4T65E - retired/salvage yard ..... PBCF user 2321


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PostPosted: Thu Sep 18, 2014 9:38 am 
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How does a throttle body fail? If the return spring breaks, the pedal will fall to the floor and it'll stay at WOT. That's not going on here. Plate unscrewed from the shaft, or binding linkage? I can't think of a way a mechanical TB would fail and cause a fluctuating idle. It seems like it would be more of a steady state, stalling or really high idle.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers and 10" Subs, 1300 watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights


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PostPosted: Thu Sep 18, 2014 4:08 pm 
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could be IAC.. Spray brake clean/carb cleaner around the lower intake manifold and see if that changes anything.. sounds like if its hunting up and down you might have a massive vac leak. some where.

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PostPosted: Thu Sep 18, 2014 7:56 pm 
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J Wikoff wrote:
How does a throttle body fail? If the return spring breaks, the pedal will fall to the floor and it'll stay at WOT. That's not going on here. Plate unscrewed from the shaft, or binding linkage? I can't think of a way a mechanical TB would fail and cause a fluctuating idle. It seems like it would be more of a steady state, stalling or really high idle.


Here's how:
general-chat/topic39419.html?hilit=throttle

When the TB was marginal, it did not throw any error codes. The engine would take spells of high idle, or idle properly, then take off as high as 3500 rpms. Until this I did not believe a TB could fail with the exception of the butterfly. - BC

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2017 Hyundai Santa Fe Sport ..... 1992 Bonneville SSE 1SB 170 HP L27 4T60E retired/sold to MattStrike ..... 2005 Bonneville SE 1SC 205 HP L36 4T65E - retired/salvage yard ..... PBCF user 2321


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PostPosted: Fri Sep 19, 2014 4:23 am 
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I see. So it would be a good idea to look at the blade and make sure it seats well when it's closed and opens smoothly.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers and 10" Subs, 1300 watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights


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PostPosted: Fri Sep 19, 2014 10:22 am 
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Sounds like a vacuum leak to me.

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PostPosted: Fri Sep 19, 2014 8:16 pm 
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crash93ssei wrote:
Sounds like a vacuum leak to me.

RE:'92 SSE - It is/was a vacuum leak in the TB, and the butterfly is/was properly seated. The leak was somewhere in the TB casting, or one the the "plugs" in the drill holes. I put on a TB from the JY and the problem was fixed. - BC

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PostPosted: Fri Sep 19, 2014 9:26 pm 
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I had a similar issue where the engine was always under power. I got a fuel system clean at a Valvoline place and it went away. That may have not exactly been the correct solution, but I haven't had it happen again.


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PostPosted: Tue Sep 23, 2014 1:31 pm 
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Alright the problem was the throttle body itself. Seems like the butterfly valve wasn't sealed properly, at least that is what it seems like. My friend Chris found me a throttle body off of a Buick Lesabre with 140k on the odo, which is 68k less miles than my Bonnie. lol. Cleaned it up, threw it on, and she fired right up acting normal again. Took her for a spin, and she is perfectly fine. I am so excited, thank you all so much. I would have been completely lost without yall's help. Much appreciated everyone. :D

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PostPosted: Tue Sep 23, 2014 6:48 pm 
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Brudus10 wrote:
Alright the problem was the throttle body itself. Seems like the butterfly valve wasn't sealed properly, at least that is what it seems like. My friend Chris found me a throttle body off of a Buick Lesabre with 140k on the odo, which is 68k less miles than my Bonnie. lol. Cleaned it up, threw it on, and she fired right up acting normal again. Took her for a spin, and she is perfectly fine. I am so excited, thank you all so much. I would have been completely lost without yall's help. Much appreciated everyone. :D

I'm really glad you got that monkey off your back. I had mine for a number of years. - BC

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2017 Hyundai Santa Fe Sport ..... 1992 Bonneville SSE 1SB 170 HP L27 4T60E retired/sold to MattStrike ..... 2005 Bonneville SE 1SC 205 HP L36 4T65E - retired/salvage yard ..... PBCF user 2321


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