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06-06-2011, 12:00 AM
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#1 |
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Registered User
Join Date: May 2011
Location: Anahuac Tx
Posts: 111
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1986 chevy truck
I killed the engine on my stock 305 1986 chevy truck at the store today. With a burrito and coke in hand, I started the truck to go to work and the rpms went super high. I dont have a tach but it was like haveing the pedal to the floor. I shut it down and retried many times. I have checked the linkage and cable and so forth with no solution. It gave no warning signs on my way to work. Is there something that can just break or go out to cause this problem?
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06-06-2011, 12:11 AM
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#2 |
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Registered User
Join Date: May 2011
Location: Anahuac Tx
Posts: 111
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Re: 1986 chevy truck
I was afraid to let it idle that high so I could not trouble shoot with the motor running.
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06-06-2011, 12:15 AM
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#3 |
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Senior Member
Join Date: May 2004
Location: Caldwell,Tx.
Posts: 3,648
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Re: 1986 chevy truck
The choke has a high idle cam so it may be faulty and is running the engine on the high idle step. Check the linkage on the passenger side of the carb .
Frank
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Born and proudly residing in a Red State ! |
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06-06-2011, 12:35 AM
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#4 |
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Registered User
Join Date: Nov 2008
Location: Duluth, GA
Posts: 80
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Re: 1986 chevy truck
Does it have cruise control?
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Sit back. Relax. Enjoy the ride!  86 Chevy Scottsdale C20, SBC 350, TH400, 4.10 gear ratio |
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06-06-2011, 12:40 AM
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#5 |
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Registered User
Join Date: May 2011
Location: Anahuac Tx
Posts: 111
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Re: 1986 chevy truck
Thanks. I have been reading in my Haynes book about the high idle cam. Yes it does have cruise control but it does not work. i have been using the truck for two months as as a rolling project and have done little to it. I am at work until six am and am trying to get some ideas for when I get off in the morning.
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06-06-2011, 12:49 AM
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#6 |
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Registered User
Join Date: Nov 2008
Location: Duluth, GA
Posts: 80
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Re: 1986 chevy truck
I had a similar problem a few years ago when my cruise control (not engage at the time) disrupted the throttle linkage on the carb causing it to race with high RPMs like you described. What was discovered is the lever that is connected to the cruise control snapped and lodge into the throttle cable. Scared me enough that I had to park the truck and have it towed. It was so strong, that I had the brake pedal pressed down and the truck kept moving!
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Sit back. Relax. Enjoy the ride! 86 Chevy Scottsdale C20, SBC 350, TH400, 4.10 gear ratio |
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06-06-2011, 12:55 AM
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#7 |
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Registered User
Join Date: May 2011
Location: Anahuac Tx
Posts: 111
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Re: 1986 chevy truck
Wow, that would be scarey. Fortunatly I was not driving. I was in park. It sounded like the engine would blow if it kept going. Its killing me to sit at work thinking about it. Oh well, six more hours and I will be under the hood. How did you add the picture to your user name?
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06-06-2011, 01:05 AM
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#8 |
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Registered User
Join Date: Nov 2008
Location: Duluth, GA
Posts: 80
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Re: 1986 chevy truck
It's at the top of forum menu tab labeled "User CP". It's a little tricky, yet you will get use to it. You can upload PICs in this section, create your advatar and the like. Hope this helps. Keep us posted.
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Sit back. Relax. Enjoy the ride! 86 Chevy Scottsdale C20, SBC 350, TH400, 4.10 gear ratio |
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06-06-2011, 05:27 PM
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#9 |
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Registered User
Join Date: Jan 2010
Location: Roanoke, Tx.
Posts: 1,561
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Re: 1986 chevy truck
Does the truck have a carb, or TBI.
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06-06-2011, 06:39 PM
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#10 |
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Registered User
Join Date: Apr 2011
Location: corpus christi, tx - america's fattest city
Posts: 253
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Re: 1986 chevy truck
Check your brake booster check valve and the hose.
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06-06-2011, 08:10 PM
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#11 |
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Registered User
Join Date: Sep 2010
Location: los angeles
Posts: 1,136
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Re: 1986 chevy truck
Did you finish the burrito and coke?
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06-07-2011, 01:05 AM
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#12 | |
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What Hump?
Join Date: Apr 2003
Location: New River AZ
Posts: 2,009
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Re: 1986 chevy truck
Quote:
 All kidding aside it sounds like everyone is on the right track. As for your motor unless you threw a rod I doubt you did much damage.
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Lil red 86 c-10 99 Sub 78 Camper Special w/ 454 Last edited by Eyegore; 06-07-2011 at 01:06 AM. |
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06-11-2011, 12:34 PM
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#13 |
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Registered User
Join Date: May 2011
Location: Anahuac Tx
Posts: 111
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Re: 1986 chevy truck
Thanks for all of the help. I found the linkage from the diaphragm (the one with the big loop) was bent in a way that the throttle could not return to normal idle position. It was an easy fix. I am sorry for the delayed post but we left for vacation as soon as I got home. Yes I did eat the burrito. Thanks again.
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