weird engine idle question
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
weird engine idle question
So new 428 all broken in. Started it this afternoon to move it around the yard and we have it set for a high idle of about 1100 till the engine really gets worn in and then for the hydroboost to get the air bubbles out.
What was weird was it was ideling at about 1200 then all of a sudden it dropped to 200 and died.... No idea how to explain it!
Could it be that I had the pcv plugged into the rear brake booster port and not the pcv port on the front? Other then that all the other vacuum ports are plugged and the vacuum advance is in the right port as well.
So im stumped...
What was weird was it was ideling at about 1200 then all of a sudden it dropped to 200 and died.... No idea how to explain it!
Could it be that I had the pcv plugged into the rear brake booster port and not the pcv port on the front? Other then that all the other vacuum ports are plugged and the vacuum advance is in the right port as well.
So im stumped...
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Could it be the choke? My mechanic said it sounded like a vacuum leak to him but hed have to see it and I cant drive back down again to his shop cuz I have no exhaust right now and I already got away with open header run once.lol
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Oh idk... He just got under the hood and said he set the idle so it was higher then in a week or so of driving it around I can turn it down.... Whats the high idle? Isnt there a screw just for that? I wonder if that's at 1200 and then the regular idle is way to low...
Senior User
Joined: Oct 2012
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From: Arlington
What carb? aftermarket with a electric choke will have a adjustment screw near the idle screw, typically it is pointed downward, you have to hold the throttle wide open to get a screw driver on it.
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
just read directions and the high idle screw is set between 1200-1400 so ill turn it down a bit and turn the regular idle up! Wonder if that's the issue.lol
EDIT: 1500-1600 high idle... And I think the choke is on a little long for my pref so ill adjust a few things tomorrow and I think thatl fix it
I hope....
http://www.holley.com/data/Products/...0487-1rev4.pdf
EDIT: 1500-1600 high idle... And I think the choke is on a little long for my pref so ill adjust a few things tomorrow and I think thatl fix it
I hope....http://www.holley.com/data/Products/...0487-1rev4.pdf
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Thread Starter
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
LOL all good! Yea regular idle take a big flat head screw driver. The high idle take a .25" socket. Ill play with it in the AM and see what happens.
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