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Joined: Mar 2010
Posts: 32
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Mar 2010
Posts: 32 |
I have posted a few times with only a small response to each. I am young and new to this. I have a 71 k 5 blazer and am not scared to get my hands dirty thats how u learn by doing it, i find so many just too scared to try but when i run into problems i seek advice. So far i rebuilt the carb, changed plugs, blew the gasline out oiled the pistons, checked the timing. Then i turned the key, took a little bit but she started and ran. Now i have more problems, The truck idles very high and gets up to like 15mph. I press the brake and it feels like its still giving gas. I had a little backfiring and the choke doesnt seem like its working right. I start it and it runs fine till i give it gas then it just seems to stay reving very high. Can anybody help me out or give me some advice. Really appreciate it
im listening because somebody always knows more than I.
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Willwood Engineering
Wilwood Engineering designs and manufactures high-performance disc brake systems.
Wilwood Engineering, Inc. - 4700 Calle Bolero - Camarillo, CA 93012 - (805) 388-1188
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
Have you tried adjusting the idle screw on the carburetor? Sounds like it is set for too fast idle.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Mar 2010
Posts: 32
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Mar 2010
Posts: 32 |
i only trird adjusting the air and gas screws on the carb and nothing happens
im listening because somebody always knows more than I.
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Joined: Feb 2009
Posts: 597
Oil Can Mechanic
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Oil Can Mechanic
Joined: Feb 2009
Posts: 597 |
Did you say you hit the brake and the engine sped up. To me that sounds like vacuum leak and perhaps something set too rich.
It's not how fast you can go, but how good you look at 20 MPH.
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Joined: Jan 2008
Posts: 828 Likes: 6
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2008
Posts: 828 Likes: 6 |
First thing you need to to is take the air cleaner lid off and watch the choke plate as the engine warms up and see if it opens, if not there my not be enough heat from the exhaust getting to crossover passage in the manifold. It was common for the heat passage to plug with carbon on higher mileage motors. That should have the choke spring on the manifold and you can feel by the spring and see if it gets hot as the engine warms up. Also check the heat riser valve to see that it free. If the choke opens then your fast idle cam may be binding, or the screw set to fast.
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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Joined: Nov 2001
Posts: 19,758 Likes: 63
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 63 |
Are you sure that you have the carburetor back together correctly? There is a cam on the choke/throttle linkage that sets the fast idle when the choke is on. When the engine warms that cam rotates to reduce the idle speed. Your description of the problems highly suggests the choke/idle cam is not working properly.
How Sweet the roar of a Chevy four!
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Joined: Mar 2010
Posts: 32
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Mar 2010
Posts: 32 |
OK i did check it and i did not have a cable on correctly. After that i checked it and was a ble to set the fast idle cam correctly, yay. I now am noticing a loud click click click click from the motor. Could this be a pully on the fan or something? My truck is starting to become a beast again thanks to all your help on here. I notice that its running extremely rich though, my plugs are completely fouled in gas. But i was running it with bad gas from somewhere at first. How do i get my exauhst to smell better? lol funny question i think.
im listening because somebody always knows more than I.
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