Very High RPM at start - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nima · 10-30-2004, 12:27 PM

Today I went to start the truck after few days. Last time I started it was the time that I reset the timming with some of board memeber help.At that time, it was startind and idling nicely. Since then truck was parked in the Garage. Is my timming too advance? Any help would be appreciated. Thanks

Budweis · 10-30-2004, 12:35 PM

prob just the choke kicking in did you try kicking it down? as long as was idling and running good before and you tightened distributor down tight it shouldnt be the timing. check your choke adjustments and if doesnt kick down once warmed up then adjust the idle. how high is very high rpm when starting? if roaring then look and see whats makeing the throttle move when you start it. and dont run it like that till you get figured out. what kind of carb you got?

Nima · 10-30-2004, 01:35 PM

Carb is new edlebrock 1406 with electric choke, and yes it roars right at start. I tightend the distributor. I didn't connected the chock since I am in LA/Ca and it's choke was not connected before either. I am just afraid to let it run like this until it warms up.

Bill72BB · 10-30-2004, 01:37 PM

Check to see if the High speed idle cam on the carb is stuck .Here is a PIc you can back the screw off the cam .

Nima · 10-30-2004, 02:24 PM

Thanks Bill72. It was stuck and I don't know why. I thought I had a good linkage but apparently when I try to tighten the linkage it doesn't move freely. Anybody knows if there is any kind of throttle linkage which I need to use for edlebrock?

Tx Firefighter · 10-30-2004, 02:28 PM

You need to hook the choke wire up. That wire is what heats the choke element to open it up when the truck gets warmed up.

Bill72BB · 10-30-2004, 03:03 PM

Quote:

Originally Posted by Nima

Thanks Bill72. It was stuck and I don't know why. I thought I had a good linkage but apparently when I try to tighten the linkage it doesn't move freely. Anybody knows if there is any kind of throttle linkage which I need to use for edlebrock?

I have my electric choke hooked up , just run 12V to the choke make sure the 12v is only their when the key is turned on ,there is a unfused 12v source at the fuse box that only has 12v when the key is on .
If you don't want to run the electric choke just back the screw off so it never hits the high idle cam.

Budweis · 10-30-2004, 05:34 PM

looks like some good advice glad you got a handle on it

dwaite72lnghrn · 10-30-2004, 08:41 PM

I think if he isn't going to hook up the choke wire, Then take the choke off completely. Otherwise when it is real warm outside the choke will be open and the idle will be off again. The choke is 1 wire hook up and set it once and forget it, If the temp is always warm out the choke will never cause the choke to close, If the temp drops the choke will give him a little faster idle. To adjust the choke so it never closes I think he just has to loosen 3 small screws then turn the choke till it opens. This should be done cold.

67_SS396 · 10-31-2004, 03:29 AM

Setting an electric choke needs to be done with the engine at operating temp. Loosen the three screws, turn the choke housing clockwise until the butterfly starts to close, then back off one notch.

10-30-2004, 12:27 PM	#1
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Very High RPM at start Today I went to start the truck after few days. Last time I started it was the time that I reset the timming with some of board memeber help.At that time, it was startind and idling nicely. Since then truck was parked in the Garage. Is my timming too advance? Any help would be appreciated. Thanks

10-30-2004, 12:35 PM	#2
Budweis Geared for Collision Join Date: Jan 2004 Location: St. Louis, Mo. Posts: 683	prob just the choke kicking in did you try kicking it down? as long as was idling and running good before and you tightened distributor down tight it shouldnt be the timing. check your choke adjustments and if doesnt kick down once warmed up then adjust the idle. how high is very high rpm when starting? if roaring then look and see whats makeing the throttle move when you start it. and dont run it like that till you get figured out. what kind of carb you got? __________________ MEMBER OF THE 4 WHEEL DISK BRAKE CLUB 1970 C/K20 3/4 Ton 1996 Collectors Edition Corvette 1977 Corvette Coupe Last edited by Budweis; 10-30-2004 at 12:38 PM.

10-30-2004, 01:37 PM	#4
Bill72BB Thats the Hillbilly way Join Date: Jul 2001 Location: Torrance,Ca Posts: 5,980	Check to see if the High speed idle cam on the carb is stuck .Here is a PIc you can back the screw off the cam . Attached Images __________________ BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen , Last edited by Bill72BB; 10-30-2004 at 01:40 PM.

10-30-2004, 02:28 PM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	You need to hook the choke wire up. That wire is what heats the choke element to open it up when the truck gets warmed up. __________________ I'm on the Instagram- @Gearhead_Kevin

10-30-2004, 05:34 PM	#8
Budweis Geared for Collision Join Date: Jan 2004 Location: St. Louis, Mo. Posts: 683	looks like some good advice glad you got a handle on it __________________ MEMBER OF THE 4 WHEEL DISK BRAKE CLUB 1970 C/K20 3/4 Ton 1996 Collectors Edition Corvette 1977 Corvette Coupe

10-30-2004, 01:35 PM	#3
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Carb is new edlebrock 1406 with electric choke, and yes it roars right at start. I tightend the distributor. I didn't connected the chock since I am in LA/Ca and it's choke was not connected before either. I am just afraid to let it run like this until it warms up.

10-30-2004, 02:24 PM	#5
Nima Blue 67 Join Date: Apr 2004 Location: Western WA Posts: 1,179	Thanks Bill72. It was stuck and I don't know why. I thought I had a good linkage but apparently when I try to tighten the linkage it doesn't move freely. Anybody knows if there is any kind of throttle linkage which I need to use for edlebrock?

10-30-2004, 08:41 PM	#9
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	I think if he isn't going to hook up the choke wire, Then take the choke off completely. Otherwise when it is real warm outside the choke will be open and the idle will be off again. The choke is 1 wire hook up and set it once and forget it, If the temp is always warm out the choke will never cause the choke to close, If the temp drops the choke will give him a little faster idle. To adjust the choke so it never closes I think he just has to loosen 3 small screws then turn the choke till it opens. This should be done cold. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

10-31-2004, 03:29 AM	#10
67_SS396 Registered User Join Date: Mar 2000 Location: Blue Ridge, Tx Posts: 1,172	Setting an electric choke needs to be done with the engine at operating temp. Loosen the three screws, turn the choke housing clockwise until the butterfly starts to close, then back off one notch. __________________ Fawker Fab three seater rock crawler buggy 498 BBC/SM465/203/205 doubler, propane, 5.13's, 42" PB Rockers '66 C10 - The new hot rod '77 3+3 Dually - 12 valve 4wd conversion tow rig project '28 Ford 2 door sedan street rod RevLimit Offroad "Hang on beer, we can do this."



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