Home » Public Forums » GMCnet » Startup idle-too fast
| Startup idle-too fast [message #359696] |
Thu, 22 October 2020 12:04  |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
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So I’m heading over to pick up the motorhome and have in past experienced a pretty fast idle that does not want to drop off till I run it out on the road for a bit. I’ve readjusted the electric choke back to a middle setting but that has not any difference on the fast idle. This is a quadrojet Rodchester I believe. Where would be the fast idle adjustment screw on these? I’ve seen videos online that show them on the drivers side if looking at it from the front. When I look at it I don’t see anything there as in the video.
Anyhow,
Thanks
TG
Tom Geiger
76 Eleganza II
KCMO
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| Re: [GMCnet] Startup idle-too fast [message #359698 is a reply to message #359696] |
Thu, 22 October 2020 12:19  |
James Hupy
Messages: 6806
Registered: May 2010
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Tom, 0n the passenger side, near the choke, is a gravity controlled linkage
that is part of the fast idle circuit. It is frequently sticky, due in part
to the choke stove below it. Spray it with Kroll or something similaron a
cold engine, and manipulate the linkage by hand until it is free. See if
that helps.
Jim Hupy
Salem, Oregon
On Thu, Oct 22, 2020, 10:05 AM tom geiger via Gmclist <
gmclist@list.gmcnet.org> wrote:
> So I’m heading over to pick up the motorhome and have in past experienced
> a pretty fast idle that does not want to drop off till I run it out on the
> road for a bit. I’ve readjusted the electric choke back to a middle
> setting but that has not any difference on the fast idle. This is a
> quadrojet
> Rodchester I believe. Where would be the fast idle adjustment screw on
> these? I’ve seen videos online that show them on the drivers side if
> looking at it from the front. When I look at it I don’t see anything
> there as in the video.
>
> Anyhow,
> Thanks
> TG
> --
> Tom Geiger
> 76 Eleganza II
> KCMO
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Startup idle-too fast [message #359699 is a reply to message #359698] |
Thu, 22 October 2020 13:27 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Where are you pulling the power to the elec
tric choke.
On Thu, Oct 22, 2020 at 10:20 AM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Tom, 0n the passenger side, near the choke, is a gravity controlled linkage
> that is part of the fast idle circuit. It is frequently sticky, due in part
> to the choke stove below it. Spray it with Kroll or something similaron a
> cold engine, and manipulate the linkage by hand until it is free. See if
> that helps.
> Jim Hupy
> Salem, Oregon
>
> On Thu, Oct 22, 2020, 10:05 AM tom geiger via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> So I’m heading over to pick up the motorhome and have in past experienced
>> a pretty fast idle that does not want to drop off till I run it out on
> the
>> road for a bit. I’ve readjusted the electric choke back to a middle
>> setting but that has not any difference on the fast idle. This is a
>> quadrojet
>> Rodchester I believe. Where would be the fast idle adjustment screw on
>> these? I’ve seen videos online that show them on the drivers side if
>> looking at it from the front. When I look at it I don’t see anything
>> there as in the video.
>>
>> Anyhow,
>> Thanks
>> TG
>> --
>> Tom Geiger
>> 76 Eleganza II
>> KCMO
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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| Re: Startup idle-too fast [message #359705 is a reply to message #359696] |
Thu, 22 October 2020 16:37 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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If choke set cold and it’s too fast, back off fast idle cam screw on pass side. It rides on stepped cam. A little goes a long way and what you think is too fast may be correct.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Startup idle-too fast [message #359706 is a reply to message #359705] |
Thu, 22 October 2020 16:47 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Tom,
If adjusting the choke does not help, then pull the cover off and see that
it is pushing or pulling on the lever and then set it,
On Thu, Oct 22, 2020 at 2:38 PM John R. Lebetski via Gmclist <
gmclist@list.gmcnet.org> wrote:
> If choke set cold and it’s too fast, back off fast idle cam screw on pass
> side. It rides on stepped cam. A little goes a long way and what you
> think is too fast may be correct.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Startup idle-too fast [message #359708 is a reply to message #359696] |
Thu, 22 October 2020 19:59 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
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Good question Jim K, had a mechanic install the electric choke for me so I don’t know where he pulled it from. I did take a read on it and it does read 12v at the connection.
I will spray that linkage with WD and work it a bit. I’ll also adjust that screw to see if I can get the fast idle down a bit. 950rpm or so? Right now the idle climbs up to at least 2k and possibly even higher so its certainly racing.
On the choke adjustment, what should it be adjusted to for winter starts as oppose to summer starts?
Thanks,
Tom
Tom Geiger
76 Eleganza II
KCMO
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| Re: [GMCnet] Startup idle-too fast [message #359709 is a reply to message #359708] |
Thu, 22 October 2020 23:23 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Tom,
1500rpm max
On Thu, Oct 22, 2020 at 6:00 PM tom geiger via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Good question Jim K, had a mechanic install the electric choke for me so
> I don’t know where he pulled it from. I did take a read on it and it does
> read 12v at the connection.
>
> I will spray that linkage with WD and work it a bit. I’ll also adjust
> that screw to see if I can get the fast idle down a bit. 950rpm or so?
> Right now the idle climbs up to at least 2k and possibly even higher so
> its certainly racing.
>
> On the choke adjustment, what should it be adjusted to for winter starts
> as oppose to summer starts?
>
> Thanks,
> Tom
> --
> Tom Geiger
> 76 Eleganza II
> KCMO
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Startup idle-too fast [message #359721 is a reply to message #359696] |
Sat, 24 October 2020 07:18 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
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Ok Matt, won’t use WD but rather “Free All”, its formulated to free up anything its sprayed onto. That should work.
I’m going to try to set the choke flap according to what was described because when I went over to pick it up and bring it back to the house it started up pretty quickly, slowly worked its revs up to 2k plus and had to let it run for awhile, 5-8 minutes before it wouldn’t stall when I put in drive. Really inconvenient when trying to start it up and get going after a weekend camping. Just acts a little cold after I did the crossover blockoffs.
TG
Tom Geiger
76 Eleganza II
KCMO
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| Re: Startup idle-too fast [message #359725 is a reply to message #359721] |
Sat, 24 October 2020 09:54 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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tgeiger wrote on Sat, 24 October 2020 08:18Ok Matt, won’t use WD but rather “Free All”, its formulated to free up anything its sprayed onto. That should work.
I’m going to try to set the choke flap according to what was described because when I went over to pick it up and bring it back to the house it started up pretty quickly, slowly worked its revs up to 2k plus and had to let it run for awhile, 5-8 minutes before it wouldn’t stall when I put in drive. Really inconvenient when trying to start it up and get going after a weekend camping. Just acts a little cold after I did the crossover blockoffs.
TG
TG,
The above says that the idle tuning is not right.
Unfortunately, I am not good enough to tell you where it most likely could use adjustment. There really are just two things, mixture and timing. Mixture is the combination of the choke plate starting position, the throttle stop screw and the two idle jet screws that and under the float bowl. Those are a bear to get to without the "around the corner" screw driver. The timing is not a bad bet if you eliminated the TVS from the system.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Startup idle-too fast [message #359731 is a reply to message #359725] |
Sat, 24 October 2020 10:36 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I kinda hesitate to jump into this pond, but, what the heck! Here goes
nuttin'. Absolutely stone cold engine. Open Hatch. Remove Air cleaner.
Place kneeling board across hatch opening. GENTLY, touch the closed choke
plate. Oh, you say, the choke plate is not closed all the way. Reach over
and push ONCE on the accelerator. The choke linkage should set the choke
in the closed position. If that does not happen, spray the crap out of all
the carb linkage with a lubricating spray. NOT WD-40!. Kroil or similar
works fine. Make sure linkage is freed up.
Then, lightly take one finger and GENTLY touch the closed choke plate.
Just the slightest touch should move the choke plate. If not, find a small
right angle standard screwdriver, and loosen but do not remove the three
screws holding the black phenolic choke cover in place. Turn the choke
cover and watch the choke plate. It should move towards the open position.
Then, slowly, move the choke cover just enough to JUST CLOSE the choke
plate. Touch it lightly with your finger. It should move towards the open
position with just the slightest touch. Tighten those 3 screws. Re-install
the air cleaner. Get in the driver's seat, and start the engine. It should
start right up. If it starts and dies, remove the air cleaner and look at
the choke plate. It should still be closed. If it is open, the electric
heating coil is overheating the thermostatic spring in the choke. If that
is the case, find a power source that does not come on until the alternator
starts charging. That should help. If this basic adjustment is beyond your
skill level, take the coach to someone who can do the adjustment.
Jim Hupy
Salem, Oregon
On Sat, Oct 24, 2020, 7:54 AM Matt Colie via Gmclist <
gmclist@list.gmcnet.org> wrote:
> tgeiger wrote on Sat, 24 October 2020 08:18
>> Ok Matt, won’t use WD but rather “Free All”, its formulated to free up
> anything its sprayed onto. That should work.
>> I’m going to try to set the choke flap according to what was described
> because when I went over to pick it up and bring it back to the house it
>> started up pretty quickly, slowly worked its revs up to 2k plus and had
> to let it run for awhile, 5-8 minutes before it wouldn’t stall when I put
>> in drive. Really inconvenient when trying to start it up and get going
> after a weekend camping. Just acts a little cold after I did the crossover
>> blockoffs.
>>
>> TG
>
> TG,
>
> The above says that the idle tuning is not right.
> Unfortunately, I am not good enough to tell you where it most likely could
> use adjustment. There really are just two things, mixture and timing.
> Mixture is the combination of the choke plate starting position, the
> throttle stop screw and the two idle jet screws that and under the float
> bowl.
> Those are a bear to get to without the "around the corner" screw driver.
> The timing is not a bad bet if you eliminated the TVS from the system.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: Startup idle-too fast [message #359794 is a reply to message #359696] |
Mon, 26 October 2020 15:34 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Ok, I’ve gone back over the choke setting and flap is shut. I also sprayed all the linkage with “Free All”. If that stuff doesn’t get things working I’m not sure what will. I’m letting that stuff work over night and will start it tomorrow morning. I have located the startup idle screw and not sure how I’ll reach it with all the stuff in the way. Also is that screw a star screw, or possibly allen wrench? Tried a phillips on it and it seemed to not be what it was.
Thanks,
TG
Tom Geiger
76 Eleganza II
KCMO
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| Re: [GMCnet] Startup idle-too fast [message #359795 is a reply to message #359794] |
Mon, 26 October 2020 15:51 |
James Hupy
Messages: 6806
Registered: May 2010
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It is normally a slotted screw, unless a rebuilder has replaced it with a
"tamper resistant" version. Then, all bets are off.
Jim Hupy
Salem, Oregon
On Mon, Oct 26, 2020, 1:35 PM tom geiger via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Ok, I’ve gone back over the choke setting and flap is shut. I also
> sprayed all the linkage with “Free All”. If that stuff doesn’t get things
> working I’m not sure what will. I’m letting that stuff work over night
> and will start it tomorrow morning. I have located the startup idle screw
> and not sure how I’ll reach it with all the stuff in the way. Also is
> that screw a star screw, or possibly allen wrench? Tried a phillips on it
> and it seemed to not be what it was.
>
> Thanks,
> TG
> --
> Tom Geiger
> 76 Eleganza II
> KCMO
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: Startup idle-too fast [message #359800 is a reply to message #359696] |
Mon, 26 October 2020 17:26 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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Hazard Fright, like it. Yes that place is my place to go, that and a local Home Improvement store called Menards. So I think I’ll have the star driver I’ll need cuz after hitting it with degreaser I can see thats what it is. Wish me luck in the morning. I’ll report how it goes.
Thanks,
TG
Tom Geiger
76 Eleganza II
KCMO
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| Re: Startup idle-too fast [message #359863 is a reply to message #359696] |
Thu, 29 October 2020 07:12 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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Well I went thru the adjustments and tried to start it and it would not start, so I loosened the screws on the choke cover and adjusted it so the flap was nearly closed again and then tried it and it started right up. It did gradually start climbing in revs as it warmed up and I adjusted the idle back to roughly 1000 to 1200rpm. Seem to not stall now with a much shorter warmup, so it seems to have worked. I did go thru this a couple years ago and did notice the idle adjustment screw seemed to be a little loose when I adjusted it so I wonder if it simply vibrates out of adjustment over time. Any ideas to help this?
Thanks,
Tom
Tom Geiger
76 Eleganza II
KCMO
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| Re: Startup idle-too fast [message #359864 is a reply to message #359863] |
Thu, 29 October 2020 08:11 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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tgeiger wrote on Thu, 29 October 2020 08:12Well I went thru the adjustments and tried to start it and it would not start, so I loosened the screws on the choke cover and adjusted it so the flap was nearly closed again and then tried it and it started right up. It did gradually start climbing in revs as it warmed up and I adjusted the idle back to roughly 1000 to 1200rpm. Seem to not stall now with a much shorter warmup, so it seems to have worked. I did go thru this a couple years ago and did notice the idle adjustment screw seemed to be a little loose when I adjusted it so I wonder if it simply vibrates out of adjustment over time. Any ideas to help this?
Thanks,
Tom
Tom,
That idle speed adjust should be too tight to turn with fingers, manageable with a screwdriver. If it is looser than that, there are a couple of fixes. The easiest is a single drop of PINK Loctite. There are others that all work better but are of increasing risk.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Startup idle-too fast [message #359871 is a reply to message #359869] |
Thu, 29 October 2020 18:17 |
Norm Bowker
Messages: 6
Registered: August 2010
Karma: 0
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Junior Member |
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All this talk about choke settings & nobody has mentioned the vacuum pull off. When I had my 76 El II I had the choke set after many small adjustments that it started & ran like it was fuel injected.
Sent from my iPad stormn
> On Oct 29, 2020, at 5:59 PM, Matt Colie via Gmclist wrote:
>
> tgeiger wrote on Thu, 29 October 2020 08:12
>> Well I went thru the adjustments and tried to start it and it would not start, so I loosened the screws on the choke cover and adjusted it so the
>> flap was nearly closed again and then tried it and it started right up. It did gradually start climbing in revs as it warmed up and I adjusted the
>> idle back to roughly 1000 to 1200rpm. Seem to not stall now with a much shorter warmup, so it seems to have worked. I did go thru this a couple
>> years ago and did notice the idle adjustment screw seemed to be a little loose when I adjusted it so I wonder if it simply vibrates out of
>> adjustment over time. Any ideas to help this?
>>
>> Thanks,
>> Tom
>
> bdub wrote on Thu, 29 October 2020 09:27
>> There should be a little spring on the screw to keep it from backing off.
>> https://tinyurl.com/yycnyb7h (trying out my new tinyurl extension) ;)
>>
>> bdub
>
> It does not pain me at all to admit that Billy is right about this. Mine is missing and I didn't even know it should be there, I just fixed it.
> I like the spring idea better.
>
> Matt
>
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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