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Old 12-12-2008, 07:23 PM   #1
57larry
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Qjet won't kick down

when it was warm, my 84 C10 with a 350 and Q jet carb ran fine. Now it's cold and it idles high and I can't get it to kick down. it has power going to the electric choke. what should I check? thanks
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Old 12-12-2008, 09:28 PM   #2
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Re: Qjet won't kick down

Larry,

I would test the choke with a multimeter to make sure it has a closed circuit, It could be blown. Also check your high idle cam and linkage on the carb for any binding/stiffness.

Good Luck
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Old 12-12-2008, 09:57 PM   #3
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Re: Qjet won't kick down

ok, thanks, I'll check the ground
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Old 12-12-2008, 11:15 PM   #4
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Re: Qjet won't kick down

It's not really a 'ground' your checking, Un-plug the wire and set your meter on ohm's scale. Touch one test lead to the wire connector and the other to any part of the carb, You should get a closed circuit reading if not the heater windings are blown.....
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97 GMC Ext. Cab
502 Crate 5 Spd......Sucks Gas But Haulz Azz !


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"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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Old 12-13-2008, 11:43 AM   #5
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Re: Qjet won't kick down

are the choke windings able to be replaced?
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Old 12-13-2008, 04:41 PM   #6
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Re: Qjet won't kick down

No, Just replace the choke assembly then adjust while the engine is cold.
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88 TA-GTA in the works....
97 GMC Ext. Cab
502 Crate 5 Spd......Sucks Gas But Haulz Azz !


The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic.


"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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Old 12-13-2008, 05:40 PM   #7
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Re: Qjet won't kick down

I also have a Q- jet question. On my 77 with a 350 if i tap the pedal it kicks down but when I place it back into park after driving it idles high again. Any ideas what could be causing this.

thanks
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Old 12-13-2008, 06:44 PM   #8
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Re: Qjet won't kick down

its a QJET thats why i got a eldy
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Old 12-13-2008, 08:43 PM   #9
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Re: Qjet won't kick down

Quote:
Originally Posted by 73chevyman View Post
its a QJET thats why i got a eldy

I have an eddy on my 84 and love it. easy to tune and runs dead on all the time. But I am not switching to an eddy on my 77. If anything I will rebuild th e Q jet 25.00 for a rebuild kit and a half hours worth of work..

Anyone have ideas on mine kicking down but idling back up when placed in park?

Thanks
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1984 chevy c10, built 400sb,.(SOLD)
77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363
1956 Willys Wagon (327 chevy) Project (Now Buick 225)
1980 Corvette L-48 4 speed
1992 Mustang GT built 5.0 5 speed

1985 C10 LWB Sold
1982 K10 SWB plow truck Parted out
1986 D30 M1028 fire brush truck Parted out
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Old 12-13-2008, 10:20 PM   #10
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Re: Qjet won't kick down

Quote:
Originally Posted by 84 400 View Post
Anyone have ideas on mine kicking down but idling back up when placed in park?

Could be a couple things, When it idles high in park after driving can you tap the gas and have it idle back down ?
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93 Jeep XJ
88 Buick La Sabra
Toys;
88 TA-GTA in the works....
97 GMC Ext. Cab
502 Crate 5 Spd......Sucks Gas But Haulz Azz !


The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic.


"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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Old 12-14-2008, 05:26 PM   #11
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Re: Qjet won't kick down

OK, More than likely your fast idle cam is sticking on the first cam step. One reason could be that your choke pull-off is not operating properly. That cost's about 15 bucks and is a pretty important component that most people overlook during a rebuild. What style choke do you have? Electric, divorced?

Quote:
Originally Posted by 84 400 View Post
I have an eddy on my 84 and love it. easy to tune and runs dead on all the time. But I am not switching to an eddy on my 77. If anything I will rebuild th e Q jet 25.00 for a rebuild kit and a half hours worth of work..

Anyone have ideas on mine kicking down but idling back up when placed in park?

Thanks
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Old 12-14-2008, 09:24 PM   #12
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Re: Qjet won't kick down

yes when placed back into park it idles high but will kick down with a tap of the gas. I am not sure what style choke it is . I will have to take a closer look on friday and get back to you.
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1984 chevy c10, built 400sb,.(SOLD)
77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363
1956 Willys Wagon (327 chevy) Project (Now Buick 225)
1980 Corvette L-48 4 speed
1992 Mustang GT built 5.0 5 speed

1985 C10 LWB Sold
1982 K10 SWB plow truck Parted out
1986 D30 M1028 fire brush truck Parted out
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Old 12-15-2008, 07:42 AM   #13
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Re: Qjet won't kick down

Quote:
Originally Posted by 84 400 View Post
yes when placed back into park it idles high but will kick down with a tap of the gas. I am not sure what style choke it is . I will have to take a closer look on friday and get back to you.
More than likely it's the pull off.. I've seen that happen alot.. and a sticking linkage. WD40 it. QJets are awesome carbs.. I have a 780cfm version that I had professionally built. Crisp, clean response that's like a lightswitch. I get good mileage and equal or better performance than any Edelbrock or Holley.
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