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#26 |
One of the First
![]() Join Date: Jan 2000
Location: St. Augustine,FL.
Posts: 4,054
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Re: Runability issue. Minor. Question.
Just throwing some thoughts out there. Your situation might be different. A friend has a cool set-up for checking for vacumn leaks. Modified a small propane plumbers torch kit. Cut the flame nozzle tip down and graffed a small rubber hose over the end of the nozzle and put a old screw out air blower nozzle on the end of thr hose. Screw valve onto little bottle, turns on the propane and adjusts the flow with the air nozzle. You can stick the nozzle in close to the carb or manifold. Beats the carb spray method.
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#27 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#28 |
Registered User
Join Date: Oct 2010
Location: everett washington
Posts: 382
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Re: Runability issue. Minor. Question.
if you need any help i live in Everett and I could come over to give you a hand just pm me if you want
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a wise man once said "There are only two real rules to life... 1 - Don't sweat the small stuff 2 - Everything is small stuff |
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#29 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
I just dont get this thing. Once its warm, it just doesnt want to idle, and when restarting it takes just a tiny bit more to get it going. Im lost with this thing. Plus not to mention i dont think the choke is set right.
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#30 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
so, to get on the high cam, you crack the throttle and you can lift it to the high cam. Now, when setting the electric choke, when its dead cold, do i want the electric choke to where it will put it on the high cam idle??? Im trying to read on how to set this and not a whole lot of info. Also, i used the propane to find that there is a slight vacuum leak at the throttle shaft, but it appears like that is a normal amount. Im starting to have a feeling that its running out of fuel at idle. when you cover the carb, the idle pops up a bit, then starts to die out. So i dont think there is a vacuum leak, i think its just lean. those two screws in the front of the carb are for idlemixture correct??
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#31 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Runability issue. Minor. Question.
When it's cold and you open the throttle if the choke is working right the choke plate closes off completely and the choke goes on the high idle cam. The choke pull off pot pulls the choke plate open enough to let it run. The amount of plate opening is adjustable by the screw above the black choke cover the power wire hooks to.
Try this. Get the motor warmed up. Loosen the screws on the side of the black cover and turn it clockwise to the leanest setting. Lock it there. Make note of where it's set originally. It should have no choke working now. In your first pic after the video you have the secondary lock out highlighted in that red square. If the little tang is dropped off the rod then you know the choke isn't working. See how it runs then. THis way you eliminate the choke in your troubleshooting. And yes the mixture screws are in the front at the bottom. Can you take a pic of the carb from the top with the air cleaner off when cold and when warmed up running. |
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#32 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
At work i have a gas analyzer. I can hook that up in the tail pipe and then get the vehicle warm and let it idle, that would tell me if its lean or rich correct??? I have an old timer there that knows carbs. Im just stubborn and want to figure this out myself. I sit and read all these articles and then just stare at the damn carb and some of it starts to make sense. lol.
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#33 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Runability issue. Minor. Question.
Here's something to check. With engine off poke a small pencil (eraser end) into the vent hole in the top of the carb. End of pencil should contact metering rod hanger. You should be able to push the rods down and feel them come back up.
They could be stuck down causing a lean condition. |
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#34 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
![]() Your talking about the hole right on top right at the front correct? I lightly put a pencil in there and nothing moves in there at all. Nothing pushes down, nothing comes back up... What do you recommend doing now???
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#35 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Runability issue. Minor. Question.
That's the vent hole. Metering rods could be stuck then. You could make a small hook out of a strong wire and pull them up.
I pm'd you my number. |
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#36 |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Ya, nothing moved down there. Will i be able to grab on to the metering rod? I have no idea what they look like.
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#37 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Runability issue. Minor. Question.
Get a good small flashlight and look down the hole. THe metering rods are attached to a hanger. Bend a sharp hook on a piece of hard wire. An old metal coat hanger is good to use. Pull up gently.
If it's hard to see down the hole use a small mirror with your flashlight aimed at the mirror. The light will reflect really nice into the hole if you angle it right. In this link on page 2 the 4th pic shows what they look like from the top and how the gasket should look. http://www.vetteprojects.com/kstyer/quadrajet.htm |
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#38 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,217
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Re: Runability issue. Minor. Question.
If there are no vacuum leaks, try enriching the idle jets. If that doesn't do it it is a good posibility the float level is too low.
I agree put the strongest return spring going forward pulling from the top of the lever. Then you can put a weaker spring pulling back. |
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#39 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
Or at least how things work. So that metering rod should move up and down freely. So if it is stuck, i should take the top off and see why?? Or do they just occasionally get stuck?
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#40 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Runability issue. Minor. Question.
Good idea on the carb for learning with. Get one thats the same as yours.
If you're tearing it apart take it off the motor. Couple small screws easily lost. Metering rods should move easily. I had one that the rods hung up on the gasket occasionally. It can happen. Buy a book like this. ![]() |
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#41 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
Quick question, when reading that article, it says "When the throttle is opened and vacuum drops, a spring raises the piston and rods. They lift out of the jets and richen up the fuel mixture. " So do i need to check when its running???
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#42 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Runability issue. Minor. Question.
If you check it when it's running the rods will be pulled all the way down. When motor is off the rods should be up. Spring oushes them up. That's why I said you should be able to reach in the vent and push them down if they're not stuck in the down position.
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#43 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
Will let you know in a bit.
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#44 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Runability issue. Minor. Question.
Here's a pic for you if you end up getting another carb to practice on.
Even though it's a holley. I use a long bolt with washers and nuts and chuck it into my vice and bolt the carb to it. Easier to work on and swivel if you need to. I'm using a wing nut on the top in this pic. Works the same. |
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#45 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
So where do i look now. Actually, im going to go out and set up the choke, then run it till its warm and adjust the idle fuel mixture screws. See if fattening it up all the way does anything. If it doesnt, that means that my primaries jets are prolly to small, saying i do not have a vacuum leak which i dont think i have.
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#46 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
well, i took it out, setup the choke, Thats dead nuts on now. Has a nice high cam idle, then after about 1 min, blip the throttle and it idles where it should. then you drive it till its 100% warm and it wants to start dying at idle. when it restarts it starts up fairly easily, no black smoke. I turned out the fuel screws on the front about 2 turns and it smoothed the idle, but that was it. It still just wants to die at idle. Once you restart it, it idles decent for a min, then starts to want to die out again. i did the cover the carb with my hand and the idle increases then wants to die out. so im sure there is no vacuum leak. I think i have a lean at idle condition. When i have the propane near it, it idles perfect. ahaha. But i obv cant drive with a propane bottle nozzle near the intake.. Everywhere else the truck drives FLAWLESS. It goes good, it cruises good, good response. Just no idle. Thoughts???
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#47 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Runability issue. Minor. Question.
Back to the drawing board!! You might need to pull the top off the carb and see how deep the rods are in the jets. They are adjustable. Maybe your mechanic adjusted them too deep.
What's your timing set at? Sometimes we look at the carb as the problem when all along it's the distributor. |
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#48 |
One of the First
![]() Join Date: Jan 2000
Location: St. Augustine,FL.
Posts: 4,054
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Re: Runability issue. Minor. Question.
Use that link that I provided. Download the first write up (document). Read it. Its rather en-lighting. I think that your getting close.
Two things that makes a gas motor run - fire and fuel. Kinda appears that its a fuel issue, if you don't have a timing problem - ![]() Its not that difficult to work on a Q-Jet... If you need another Q-Jet / I have a near NOS later model sitting on my work bench. I'm sure we could work something out... ![]() David
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DAVID PASSMORE ST AUGUSTINE ,FL ZIP 32084 '71 SWB K/10 CUSTOM DELUXE (Chili) '72 BLAZER K/5 Muscle Truck (Mule) '72 LWB K/20 CHEYENNE (Blackie) |
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#49 | ||
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Runability issue. Minor. Question.
Quote:
What do i test to rule out the dist???? Timing is 16-18 degrees at idle, thats what my engine builder told me he wanted me to run. Quote:
Im open to all suggestions.
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD! ![]() My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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#50 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,626
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Re: Runability issue. Minor. Question.
Is that 16-18 degrees with the vacuum advance line plugged off!!
You don't need to buy new jets. You can adjust the metering rods so they sit higher in the jets. It's called an APT. Adjustable part throttle. It's accessible under that round plug on the carb body just in front of the vent hole. Unfortuneately you need to pull the carb top off to get the plug out. |
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