where is my choke


Old 03-10-08, 10:23 PM
Thread Starter
Join Date: Mar 2008
Posts: 1
Received 0 Votes on 0 Posts
where is my choke

what kind of choke does my 75 chevy c20 have ?

my truck starts runs rich wants to die idles low, tried to adjust the idle nothing happens.

i took of the air filter and opened the first flap and it idled alot better why is that ?

i know a little about engines but not too much about carbs.

please help
Sponsored Links
Old 03-11-08, 11:56 AM
carguyinva's Avatar
Join Date: Nov 2003
Location: Shenandoah Valley
Posts: 1,147
Received 0 Votes on 0 Posts
the flap you opened is the choke valve. when the engine is started, the choke is all the way closed but then is pulled open by a vacuum break. beyond this, it depends on what model carb it has as to specifics on choke and vacuum break settings and how it is heated. more research...more info
Old 03-11-08, 05:20 PM
Join Date: Jan 2006
Location: Ontario, Canada
Posts: 759
Received 0 Votes on 0 Posts
Pull your air cleaner off, and look at the side of the carburetor, do you see a shiny black cover about 2" round often on passenger side. Should have 3 rivets or screws holding it on to the side of your choke housing, if that's the style choke you have. If so, that is a thermostatic coil in there, that aids in pulling the choke off as engine warms. Get back to us, & if that's the case, we'll help you adjust that choke.
Old 03-12-08, 06:21 AM
the_tow_guy's Avatar
Group Moderator
Join Date: Feb 2001
Location: SW Fla USA
Posts: 11,819
Received 32 Votes on 25 Posts
Sometimes one of the heater hoses is routed alongside it in a bracket to provide temperature sensing for the warm-up.
Old 03-18-08, 08:50 PM
mikeTN's Avatar
Join Date: Dec 2007
Location: Nashville
Posts: 635
Received 0 Votes on 0 Posts

if it is a v-8 then i'm guessing a q-jet carb. at any rate, as stated, probably a round black thing on the pass. side with two wires. one black(ground) and one red(12 volt). cold, the choke plate(the one you saw under the breather) should be closed to about 1/16 inch.(as carguy stated they vary with models but this will get you close). after it warms up to operating temp., it should be fully open(straight up and down). if this isn't happening, the choke heater could be defective(choke is about 30 bucks). be sure to check the ground wire to see IF it is grounded and the pos. wire for voltage(with switch on). if it is the orig. air cleaner, there are vacuum hoses attached that go to a cold start device/flapper. you NEED a HAYNES manual!! Good luck.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes
Ask a Question
Question Title: