broken choke
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Newbie
Joined: Aug 2003
Posts: 46
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From: Brisbane
broken choke
ok so its getting colder now, and basically my car don't run real well when its cold. The choke/fast idle doesn't seem to be working at all. I had a look in my manual, and it says to check the choke by looking at the carb throat for the choke plate. My problem is I can't even find the choke plate, and it looks nothing like the diagram thats in the book. All I can see is the throttle plate and 4 pipe things (1 of which looks bent?).
so whats going on? can someone tell me how I can check the choke on my 4g15 carb?? (93 GL)
so whats going on? can someone tell me how I can check the choke on my 4g15 carb?? (93 GL)
Evolving Member
Joined: Feb 2004
Posts: 139
Likes: 0
From: nsw
hey,
the choke is the big celindrical thing in the middle, between the two brass tubes, that thing can move forward and back, hence open a bigger hole, to let more or less air. This is what gives you a richer or leaner fuel ratio, depending on the water temperature.
the choke is the big celindrical thing in the middle, between the two brass tubes, that thing can move forward and back, hence open a bigger hole, to let more or less air. This is what gives you a richer or leaner fuel ratio, depending on the water temperature.
Evolving Member
Joined: Feb 2004
Posts: 139
Likes: 0
From: nsw
hehe ok, well i dont exactly know how it works, if im wrong correct me but here is waht ive found out:
Ok that big cylindrical thing that moves with the trottle, (i.e control the amount of air allowed to enter the center barrel), is vaccum controlled.
When the engine is cold the main air passage is totally blocked, i.e the cylinder is closing the hole, so that only the idle petrol and air feed lines are active, this gives u a richer mixture to start easy when cold.
Now when the engine heats up the water, there is a little piston next to the carby, that pushes out when hot, and i "think" it opens up some valve that creates vaccum behind the big cylinder (in the pic) and pulls it back, which allows air to enter the center barrel, this gives a leaner mixture.
Now this big cylinder has to move with the throttle because it has to allow for lots of air to pass when you push hard on the accelerator. This works by more vaccum being created when at higher revs, and pulling harder on the cylider, hence opening a bigger hole.
This also works together with the valve in the center barrel, to control the air flow, which is controlled by the throttle cable.
Wheeew!
I think thats how it works
Ok that big cylindrical thing that moves with the trottle, (i.e control the amount of air allowed to enter the center barrel), is vaccum controlled.
When the engine is cold the main air passage is totally blocked, i.e the cylinder is closing the hole, so that only the idle petrol and air feed lines are active, this gives u a richer mixture to start easy when cold.
Now when the engine heats up the water, there is a little piston next to the carby, that pushes out when hot, and i "think" it opens up some valve that creates vaccum behind the big cylinder (in the pic) and pulls it back, which allows air to enter the center barrel, this gives a leaner mixture.
Now this big cylinder has to move with the throttle because it has to allow for lots of air to pass when you push hard on the accelerator. This works by more vaccum being created when at higher revs, and pulling harder on the cylider, hence opening a bigger hole.
This also works together with the valve in the center barrel, to control the air flow, which is controlled by the throttle cable.
Wheeew!
I think thats how it works
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