Electric Choke Adjustment Question
Thread Starter
Safety Car
Joined: Feb 1999
Posts: 3,631
Likes: 14
From: Fountain Hills AZ
Re: Electric Choke Adjustment Question (RickChurch)
I think the plate should open slightly when the engine starts. I'm not sure about Edelbrock's but Holly's have a mechanism that does this once it senses vacuum. Have you checked it just after starting? Too much or too little choke can cause cold stalling. Try starting it cold and watch how the choke moves as the engine warms up. If it seems to be opening too soon, adjust it tighter, if it seems to be opening too slowly, loosen it up some. There is no one setting that's right for all engines and conditions so getting it right is often a trial/error process.
Drifting
Joined: Jan 2002
Posts: 1,645
Likes: 11
From: Schaumburg IL
Re: Electric Choke Adjustment Question (RickChurch)
What you see is correct. When you "set" the choke it closes all the way. When you start the engine it should open about 1/4" which is controlled by either a vacuum or mechanical pulloff. Look at the manual and see what they say to adjust. The chuging etc is not enough pulloff. If the choke is on too long, turn the choke housing a notch or two toward learn or less spring tension.
Instructor
Joined: Jun 2002
Posts: 140
Likes: 0
From: Houston Tx
Re: Electric Choke Adjustment Question (bigvette1)
How about this,
My 77 always needs to warm up, even in the 100 degree Texas heat. Until the engine reaches 150-175, it doesn't run well and upon first startup will stall if the choke is not engaged. I also have an Edlb. 600 with electric choke. My question is this, should the choke engage even when it's 100 degrees outside? My choke was adjusted in the winter and so it does not engage when the outside temp is above 75.
Like I said, the first start is always rough and the car will die if the accelerator is not held down a bit, even in 100 degree heat.
-Russ
My 77 always needs to warm up, even in the 100 degree Texas heat. Until the engine reaches 150-175, it doesn't run well and upon first startup will stall if the choke is not engaged. I also have an Edlb. 600 with electric choke. My question is this, should the choke engage even when it's 100 degrees outside? My choke was adjusted in the winter and so it does not engage when the outside temp is above 75.
Like I said, the first start is always rough and the car will die if the accelerator is not held down a bit, even in 100 degree heat.
-Russ
Drifting
Joined: Jan 2002
Posts: 1,645
Likes: 11
From: Schaumburg IL
Re: Electric Choke Adjustment Question (77-4speed)
Russ, the choke will engage if it is adjusted for the coil with any "richness" or tension on it at all, even at 100 degrees when cold. After that unless the engine is cold, it may engage for only a small amount of time. Outside temp has minimal affect on the choke engaging when you press the gas, it is more dependent on the temp of the block, the carb and the choke housing.
As far a stalling out on the first start that is a function of the choke engaging and the choke pulloff. Start your engine cold and see what the choke plate looks like. It should be open at least 1/4" but not much more. Your manual should give you the procedures for adjustment. Check it out.
As far a stalling out on the first start that is a function of the choke engaging and the choke pulloff. Start your engine cold and see what the choke plate looks like. It should be open at least 1/4" but not much more. Your manual should give you the procedures for adjustment. Check it out.
Instructor
Joined: Jun 2002
Posts: 140
Likes: 0
From: Houston Tx
Re: Electric Choke Adjustment Question (bigvette1)
I adjusted the choke coil setting last month in the morning when the block was cold. It felt as though it was really loose but I was tired of it not coming on at all. So it worked for a day or two but the temp has since gotten warmer. Should I keep adjusting it until it always comes on when the car is cold? Is there any side effects to having the choke always engage itself when the block is cold?
I did look at the choke plate after starting and it is about 1/8-1/4" open.
Thanks
(sorry to piggyback on this thread)
Russ
PS
About Ricks problem with hesitation upon starting, I have the same problem when my choke is not engaged. When it is engaged the car warms up at about 1000 rpm until I disengage it. Hope that helps.
[Modified by 77-4speed, 2:49 PM 6/24/2002]
I did look at the choke plate after starting and it is about 1/8-1/4" open.
Thanks
(sorry to piggyback on this thread)
Russ
PS
About Ricks problem with hesitation upon starting, I have the same problem when my choke is not engaged. When it is engaged the car warms up at about 1000 rpm until I disengage it. Hope that helps.
[Modified by 77-4speed, 2:49 PM 6/24/2002]
Drifting
Joined: Jan 2002
Posts: 1,645
Likes: 11
From: Schaumburg IL
Re: Electric Choke Adjustment Question (77-4speed)
Russ, having the choke engage on a cold engine regardless of the outside air temp. is ok and necessary. A carb engine needs some fuel enrichment to run properly when cold. I would set the choke so on a cold engine the plate goes shuts regardless of the air temp. This is probably about 2 notches lean from the center of the marks on the choke housing. It should then stay partially shut until there is some warm up. The pulloff sounds like it it working ok, opening the plate about a 1/4". If the engine is "chugging" the pulloff needs to be open a slight bit more. Idleing at 1000rpms is normal, maybe even a slight bit higher.
I bet you have an alum. manifold with the exhaust crossover blocked off. (That's ok) Keep in mind that until there is some heat in the floor of the manifold the fuel does not fire properly. Any carb engine needs some warmup time to run well.
I bet you have an alum. manifold with the exhaust crossover blocked off. (That's ok) Keep in mind that until there is some heat in the floor of the manifold the fuel does not fire properly. Any carb engine needs some warmup time to run well.
