BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Stumble help.

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PostSubject: Stumble help.   Sat Oct 23, 2010 8:32 pm

The 9c1 has a small issue. When you give it throttle, it will stumble and then clear out and go. This is just a slight stumble, but still a stumble. I know the opti is good. Pretty sure the wires are. I left the plugs in. Any Ideas?
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MASShole9C1

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PostSubject: Re: Stumble help.   Sat Oct 23, 2010 8:46 pm

With the TPS being a potentiometer, it can get dead spots. It may be stumbling at a spot it consistantly rides at. Check its resistance with OEM specs
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PostSubject: Re: Stumble help.   Sat Oct 23, 2010 8:51 pm

It only does it in gear driving. In park, it revs fine. I probably know the answer, but my head is so full crap, I can't think.
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toomanytoyz
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Location : East Hampstead, NH USA

PostSubject: Re: Stumble help.   Sat Oct 23, 2010 8:59 pm

Light throttle? EGR?

Regular throttle? TPS? IAC reset? TBS cleaning? Plugs? Vacuum leaks?


_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
American Ricer
www.badassofne.net
"Ooooh! Look! Something shiny!"
NO MORE UNICORNS!!!!!

LOWER IT!!! Wink
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MASShole9C1

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PostSubject: Re: Stumble help.   Sat Oct 23, 2010 9:03 pm

toomanytoyz wrote:
Light throttle? EGR?

Regular throttle? TPS? IAC reset? TBS cleaning? Plugs? Vacuum leaks?


yes
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PostSubject: Re: Stumble help.   Sat Oct 23, 2010 9:05 pm

MASShole9C1 wrote:
toomanytoyz wrote:
Light throttle? EGR?

Regular throttle? TPS? IAC reset? TBS cleaning? Plugs? Vacuum leaks?


yes
BINGO! Thanks guys. Wink
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MASShole9C1

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PostSubject: Re: Stumble help.   Sat Oct 23, 2010 9:30 pm

IMPALADAKID wrote:
MASShole9C1 wrote:
toomanytoyz wrote:
Light throttle? EGR?

Regular throttle? TPS? IAC reset? TBS cleaning? Plugs? Vacuum leaks?


yes
BINGO! Thanks guys. Wink

Basketball all in a days work
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PostSubject: Re: Stumble help.   Sat Oct 23, 2010 9:41 pm

toomanytoyz wrote:
IAC reset?
scratch Is this something I can do? What is involved?
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MASShole9C1

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PostSubject: Re: Stumble help.   Sat Oct 23, 2010 9:45 pm

Im guessing you need a scan tool

http://www.gnttype.org/techarea/faq/IACresetscan.html
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mean ss

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PostSubject: Re: Stumble help.   Sat Oct 23, 2010 9:46 pm

IMPALADAKID wrote:
toomanytoyz wrote:
IAC reset?
scratch Is this something I can do? What is involved?
http://shbox.com/1/4th_gen_tech2.html#iac_reset
Depress accelerator slightly
Start engine, then release accelerator pedal, run engine for 5 seconds
Turn ignition "OFF" for ten seconds
Restart engine and check for proper idle operation
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toomanytoyz
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Location : East Hampstead, NH USA

PostSubject: Re: Stumble help.   Sat Oct 23, 2010 9:49 pm

IMPALADAKID wrote:
toomanytoyz wrote:
IAC reset?
scratch Is this something I can do? What is involved?

I don't remember, but I know it's quick and easy. Normally that's for an idle issue anyways, but figured that it could be something worth checking if plugs and a TB service didn't clear it up... Wink










EDIT: See, I walk away for a couple minutes before I hit send and someone figured it out already... Very Happy

_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
American Ricer
www.badassofne.net
"Ooooh! Look! Something shiny!"
NO MORE UNICORNS!!!!!

LOWER IT!!! Wink
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http://impalass.uniquekind.net/
MASShole9C1

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Posts : 4222
Join date : 2009-12-16

PostSubject: Re: Stumble help.   Sat Oct 23, 2010 9:51 pm

mean ss wrote:
IMPALADAKID wrote:
toomanytoyz wrote:
IAC reset?
scratch Is this something I can do? What is involved?
http://shbox.com/1/4th_gen_tech2.html#iac_reset
Depress accelerator slightly
Start engine, then release accelerator pedal, run engine for 5 seconds
Turn ignition "OFF" for ten seconds
Restart engine and check for proper idle operation

LOL i just got done reading that study ...im dumb Question
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mean ss

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Location : Nashua NH.

PostSubject: Re: Stumble help.   Sat Oct 23, 2010 9:58 pm

MASShole9C1 wrote:
mean ss wrote:
IMPALADAKID wrote:
toomanytoyz wrote:
IAC reset?
scratch Is this something I can do? What is involved?
http://shbox.com/1/4th_gen_tech2.html#iac_reset
Depress accelerator slightly
Start engine, then release accelerator pedal, run engine for 5 seconds
Turn ignition "OFF" for ten seconds
Restart engine and check for proper idle operation

LOL i just got done reading that study ...im dumb Question

what you had posted is more for adj. the throttle blades by IAC counts but we want them in the 30's
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MASShole9C1

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PostSubject: Re: Stumble help.   Sat Oct 23, 2010 10:13 pm

I figured as much. I took a quick glance, posted, then found what you posted
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PostSubject: Re: Stumble help.   Wed Oct 27, 2010 3:07 pm

Ok
I found the IAC valve was no good. I replaced it with another one I got from crovo, along with completely rebuilding the TB out of spare parts. Now she runs like a champ. cheers
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PostSubject: Re: Stumble help.   Mon Nov 01, 2010 9:57 pm

IMPALADAKID wrote:
Ok
I found the IAC valve was no good. I replaced it with another one I got from crovo, along with completely rebuilding the TB out of spare parts. Now she runs like a champ. cheers
I was wrong. Wound up being the EGR after further diag.
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