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Edelbrock carb idles too fast
#1430897
05/05/13 09:35 PM
05/05/13 09:35 PM
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Joined: Jan 2003
Posts: 755
Oregon
moparmedic
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 755
Oregon
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I have a new Edelbrock 750 on a new engine. Did the cam break in and then throttled it back down but it wouldn't go below 1500 RPM.
Funny thing is when you first start it up it idles fine. Give it a little gas and the RPM stays at about 1500. If I cover the air intake with my hands and choke it off a little it will idle down and stay at about 750 RPM but as soon as I give it some gas again it goes right back to about 1500 RPM.
Throttle Linkage is not sticking, it is warm and the fast idle screw is not part of the equation, messed with the choke and it seems to be set correctly, checked for vacuum leaks and it doesn't seem to have any, mixture is close, any ideas?
1968 Coronet
1968 Charger
1966 A100 Pickup
1967 Barracuda
1970 Challenger
1972 Challenger
1973 Barracuda
2021 Ram 2500
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Re: Edelbrock carb idles too fast
[Re: moparmedic]
#1430900
05/05/13 11:44 PM
05/05/13 11:44 PM
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Joined: Jan 2003
Posts: 5,445
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,445
So Cal
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What cam are you running? What is the vacuum @ idle? If the vacuum is low due to cam overlap spec, the Edelbrocks need some revisions to run right... They do have a mod kit available from Summit, Jegs... Just my $0.02... 
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Re: Edelbrock carb idles too fast
[Re: Sinitro]
#1430903
05/06/13 12:15 AM
05/06/13 12:15 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Thanks bro. I have a used 1407 that I just bought & the PO said it ran OK but needs a kit. I figure all of em (the 1407's) cant be bad
live every 24 hour block of time like it's your last day on earth
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Re: Edelbrock carb idles too fast
[Re: RJS]
#1430909
05/07/13 11:27 AM
05/07/13 11:27 AM
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Joined: Jan 2003
Posts: 5,394
Pikes Peak Country
TC@HP2
master
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master
Joined: Jan 2003
Posts: 5,394
Pikes Peak Country
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Quote:
Disconnect and plug the port going to the distributor just to see if the same thing happens.
In addition to this, I'd also suggest disconnecting the brake vacuum booster hose and plugging it to see what impact it has on idle. Power diaphragms can develop vacuum leaks that will manifest themselves as a high idle.
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Re: Edelbrock carb idles too fast
[Re: TC@HP2]
#1430910
05/07/13 11:14 PM
05/07/13 11:14 PM
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Joined: Jan 2003
Posts: 755
Oregon
moparmedic
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 755
Oregon
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I had a chance to mess with it a little more. Figured I would see if the choke linkage was binding or the secondaries are hanging up. When I fired it off today, I heard a very faint whistle coming from under the hood. I guess my vacuum leak checks weren't as thorough as I thought.
I did the carb cleaner trick and the engine bogs down when I spray around the passenger side of the intake. Shure didn't seem to do that the other day though.I retorqued with no change
I just used the stamped steel valley pan with an aluminum intake and cast iron heads. Any other gasket suggestions?
1968 Coronet
1968 Charger
1966 A100 Pickup
1967 Barracuda
1970 Challenger
1972 Challenger
1973 Barracuda
2021 Ram 2500
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Re: Edelbrock carb idles too fast
[Re: moparmedic]
#1430911
05/07/13 11:28 PM
05/07/13 11:28 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Quote:
Any other gasket suggestions?
The side composition gaskets with the blue borders around the ports. I'm sure it's a felpro item (printoseal?). EDIT In addition get a blue can of Permatex "high tack" gasket cement in the spray can "the red stuff". It goes on light/even & is extremely tacky & seals very well
Last edited by RapidRobert; 05/08/13 10:52 AM.
live every 24 hour block of time like it's your last day on earth
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