Setting the choke
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Setting the choke
Hey guys,
I need help. I cant seem to get my choke set right. I always do it when the engine is completely cold ie sat over night. I have tried settting it to where the butterfly valve is open about an 1/8 inch when you hit the gas pedal. and i have tried setting it to where the butterfly valve is completely shut with a little pressure holding it shut. (this is how my mechanics assistant said to do it) when idid it this way it ran great that morning but after school the engine was stuttering on the way home for about 5 min and then it quit. However this morning i drove to school with out adjusting it and it was horrible. Can anyone help me?
thanks
David
I need help. I cant seem to get my choke set right. I always do it when the engine is completely cold ie sat over night. I have tried settting it to where the butterfly valve is open about an 1/8 inch when you hit the gas pedal. and i have tried setting it to where the butterfly valve is completely shut with a little pressure holding it shut. (this is how my mechanics assistant said to do it) when idid it this way it ran great that morning but after school the engine was stuttering on the way home for about 5 min and then it quit. However this morning i drove to school with out adjusting it and it was horrible. Can anyone help me?
thanks
David
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Joined: Dec 2001
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From: Louisville,Ky.
It should be set closed with very little pressure on it. Dies it have a pull-okk assembly on it? Is it opening as it warms up?
Also, is the hot air intake on the air cleaner working properly? If not, you may be having some carb icing problems which will make it run bad until the engine compartmant warms up.
Jimmy
Also, is the hot air intake on the air cleaner working properly? If not, you may be having some carb icing problems which will make it run bad until the engine compartmant warms up.
Jimmy
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Joined: Oct 2003
Posts: 480
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From: Elyria, Ohio
choke adjust
This is what I did on my 1979 F100 302/C4. Adjust choke house to index to 2 rich. At cold choke flap should be closed and on high step of fast cam. When you start; the vacuum pulloff should open flap to 1/8 inch and it should be on 2nd step of cam, adjust screw in housing of vacuum pulloff for opening and screw to fast idle spec 1500-2000 rpm. When totally warm flap open, fast idle screw no longer on cam; if it is adjust hex head screw behind choke housing to pull cam out of way. Warm idle now controled by screw on driver's side. It's hard to see, use a mirror; I have a diposable dental mirror from my dentist, and you have to feel around alot.
Last edited by rainbowATF; Jan 29, 2004 at 04:51 PM.
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Sorry i forgot to include the technical info. I have a 400 but am running a eddelbrock intake and 1406 carb with a chrome air cleaner. I would have tried the original air cleaner again but it sits down to far and causes the throttle linkage to hang up. Is there a way to put the factory air cleaner on with out it hanging up the linkage? If so i will try it. that the reason i boughta different cleaner in the first place. Also when i set the choke the marks on the choke housing are like 1/2 -1 inch above the marks on the carb itself. that has confused me for some time.
Thanks guys
David
Thanks guys
David
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Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
Yep, the chrome air cleaner is your problem. The intake air is not being heated and the carb is icing up. Put the stock air cleaner (with the hot air hose connected at the exhaust manifold). This will cure the running badly issue.
I fought this for ever before I figured it out. I wasn't a member here at the time. It sure would have been helpful and saved me alot of headaches if I would have been!!!!
You can always run the chrome one when the temps saty above 55 degrees or so.
Jimmy
I fought this for ever before I figured it out. I wasn't a member here at the time. It sure would have been helpful and saved me alot of headaches if I would have been!!!!
You can always run the chrome one when the temps saty above 55 degrees or so.
Jimmy
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Well guys it all fits and runs better cold but i jsut dont like its lack of power. It doesn't seem to rev as high or fast any more. Oh well i guess that the sacrifice i have to make to getit to rugn well.
Thanks again
David
Thanks again
David
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Joined: Dec 2001
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From: Louisville,Ky.
Make sure that the choke is opening completely. If not, the secondaries will not open on an Edelbrock carb. If the choke is partially closed, there is a lever that prevents the rear throttle shaft from opening.
Jimmy
Jimmy