Problems after a medium burn-out.
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No new news on what the problem is, I checked all the hoses on the tree behind the carb where the break booster connects but found nothing that looked old or weak,,
On another note tho, I got the idle down as far as I could without it dying when put into gear because I had to test drive it a bit because I have to take it to work tomorrow. I noticed that when I (got on it) it has more power now than it did before the problem. I have a step hill I go up and every day with pedal to the floor I can only get about 45 mph, today, I went up the hill and was closer to 60 mph, and I could feel the noticeable difference in the power, but as soon as I let off the gas the engine starts sounding like it has a miss. After work tomorrow I will go thru all the rubber stops and check them all.
Without a doubt tho, some kind of leak is going on near or around the break booster vacuum line at the tree.
On another note tho, I got the idle down as far as I could without it dying when put into gear because I had to test drive it a bit because I have to take it to work tomorrow. I noticed that when I (got on it) it has more power now than it did before the problem. I have a step hill I go up and every day with pedal to the floor I can only get about 45 mph, today, I went up the hill and was closer to 60 mph, and I could feel the noticeable difference in the power, but as soon as I let off the gas the engine starts sounding like it has a miss. After work tomorrow I will go thru all the rubber stops and check them all.
Without a doubt tho, some kind of leak is going on near or around the break booster vacuum line at the tree.
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From: Virginia
If your holley has the fuel level site plugs on the front and back side of the fuel bowels on the pass side of the carb, pull them and see what the fuel level is.
Horsing around with the truck can stir up dirt and rust flakes in the gas tank, and they can get sucked up into the carb and cause problems. Rusty gas tanks are a common problem with these trucks.
Horsing around with the truck can stir up dirt and rust flakes in the gas tank, and they can get sucked up into the carb and cause problems. Rusty gas tanks are a common problem with these trucks.
Lead Driver
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Check your motor mounts. All that torque may have caused one of the mounts to separate. If the motor twisted, it could have kinked a fuel line, pulled on some wires/vacuum lines, or tweaked the throttle linkage.
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Checked the fuel bowl levels, they ( front and back) are just about an 1/8 inch under the sight hole. Fuel line has not been bent or leaking.
any more idea's? I have been trying to use the pigtail to pull codes but it does not seem to work at all. Im stumped.
any more idea's? I have been trying to use the pigtail to pull codes but it does not seem to work at all. Im stumped.
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From: Virginia
What intake manifold are you running? The original factory one with the EGR on it? Is it disconnected?
Another thing to try; While it's running, with the aircleaner off go around to the pass side and fiddle with the lever that goes from the secondaries up to the secondary diaphragm. If I remember right there is a phillips screw that holds the lever onto the secondary shaft. While it's running loosen this phillips screw a little bit and see if the idle goes back down. I have had this linkage get sticky and crack the secondaries too much.
The secondaries on a holley are opened just a little bit all the time. This adjustment is a screw that goes through the baseplate up from the bottom, you have to take the carb off to adjust it. The screw stops against the dog with the phillips screw I was talking about. I would not mess with the adjustment, but I would make sure the linkage is ok and loosen that screw and then re-tighten it to see if it makes a difference.
Another thing to try; While it's running, with the aircleaner off go around to the pass side and fiddle with the lever that goes from the secondaries up to the secondary diaphragm. If I remember right there is a phillips screw that holds the lever onto the secondary shaft. While it's running loosen this phillips screw a little bit and see if the idle goes back down. I have had this linkage get sticky and crack the secondaries too much.
The secondaries on a holley are opened just a little bit all the time. This adjustment is a screw that goes through the baseplate up from the bottom, you have to take the carb off to adjust it. The screw stops against the dog with the phillips screw I was talking about. I would not mess with the adjustment, but I would make sure the linkage is ok and loosen that screw and then re-tighten it to see if it makes a difference.
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Im not sure about the intake manifold, I will check the throttle for the secondaries next tho. Here is a video of the truck and engine, but this video is older, I made this video when the carb was clogged and I was trying to figure that out, but you can see most of the engine
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OK, guys, Problem has been solved.. I was almost certain it was a vacuum leak because of the burn out I did that caused it.
I took it to a local shop today and had a guy look at it, we took the air filter off then he asked me to start it up, I did and the idle again still very high, he hit the throttle 2 times, leaned in and put his ear next to the carb and told me to shut it off, I did...He told me the test port plug sounds defective or gone and felt behind the carb and said...gone... He put a new plug on it and asked me to start it up again, I did and it was back to running perfect again.
Thanks for all your help and your time. You guys are awesome !
I took it to a local shop today and had a guy look at it, we took the air filter off then he asked me to start it up, I did and the idle again still very high, he hit the throttle 2 times, leaned in and put his ear next to the carb and told me to shut it off, I did...He told me the test port plug sounds defective or gone and felt behind the carb and said...gone... He put a new plug on it and asked me to start it up again, I did and it was back to running perfect again.
Thanks for all your help and your time. You guys are awesome !
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Joined: Nov 2015
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From: Angier, NC
Good to hear you go it fixed.
Got to ask what is this "test port" you talk about?
What does it test?
Dave ----
Got to ask what is this "test port" you talk about?
What does it test?
Dave ----
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From: Angier, NC
In the base I would also think a PCV hose hook up.
Dave ----
pedant
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From: EXTREME southwest CT
On my 0-80457s, there is only one nipple and it is to be used for PCV or brake booster.
The instructions are under 'tech resources'
https://www.holley.com/products/fuel...parts/0-80457S
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