Rochester Quadrajet 4MV Carburetor: Removal, Disassembly, Rebuild (Rookie Level) - Page 7 - Hot Rod Forum : Hotrodders Bulletin Board
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  #91 (permalink)  
Old 03-27-2011, 10:14 PM
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A vacuum leak can cause fits. If you put a brand new base gasket and hold the carb up to the light you will be able to see day light between the base gasket and carb. Aftermarket intakes don't have as much sealing area as the factory intakes.

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  #92 (permalink)  
Old 03-27-2011, 10:18 PM
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Quote:
Originally Posted by V8&4spd
A vacuum leak can cause fits. If you put a brand new base gasket and hold the carb up to the light will be able to see day light between the base gasket and carb. Aftermarket intakes don't have as much sealing area as the factory intakes.
So basically, too much air being pushed out through the open spaces between the intake manifold (this one has an Edlebrock) and the carburetor's base gasket can cause issues?
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  #93 (permalink)  
Old 03-27-2011, 10:20 PM
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Big time. I don't know if I can get a good picture, I will try tommorow.
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  #94 (permalink)  
Old 03-27-2011, 10:22 PM
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Quote:
Originally Posted by V8&4spd
Big time. I don't know if I can get a good picture, I will try tommorow.
Much appreciated if you can! Thank you soo much V8!
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  #95 (permalink)  
Old 03-28-2011, 10:26 AM
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- Reinstallation, cont'd. -


This morning, I went ahead and installed the base gasket, and reinstalled the the rod from the choke coil to the linkage. In retrospect, I believe it would be easier to setup the rod and linkage before placing the carburetor back on the manifold, and simply screwing down the choke afterwards.







------------------------




- Startup: Take 2 -


Once everything was set, I sprayed some starting fluid into the carb and started her up again. You can see a video here. From what I can see, everything seems to be functioning fine. There is a bit of a "bop bop" sound in the exhaust that someone in the other thread mentioned might be a skip. At 2:18, I rev the engine to roughly 2500 rpm and hold it there for a few seconds.
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  #96 (permalink)  
Old 03-28-2011, 11:55 AM
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Forgetting the base gasket was the problem you were having with the backfire when you tried to start it up the first time. There can't be any vacuum leaks or there will be problems. I might have a book for the emissions that will cover your truck.
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  #97 (permalink)  
Old 03-28-2011, 02:30 PM
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Sounds real smooth.
Congrats on the rebuild.
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  #98 (permalink)  
Old 03-28-2011, 03:25 PM
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Quote:
Originally Posted by V8&4spd
Forgetting the base gasket was the problem you were having with the backfire when you tried to start it up the first time. There can't be any vacuum leaks or there will be problems. I might have a book for the emissions that will cover your truck.
Yes, the missing presence of the gasket definitely turned the carb into a flame thrower lol! If you could possibly dig up some info on the truck, I'd greatly appreciate it.




Quote:
Originally Posted by 123pugsy
Sounds real smooth.
Congrats on the rebuild.
Thank you 123pugsy! I appreciate the encouragement and props! Hopefully, other nervous rookies like me can tackle this too.

There is a bit of backfire in the exhaust when revved (the same issue the truck was having before the whole water in the gas tank deal). So next I need to recheck the wires and plugs. I still think the plugs were gapped in a way as to hide some issues by the previous owner. I went with the same gap when I changed them.
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  #99 (permalink)  
Old 03-28-2011, 03:32 PM
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This is the vacuum hose routing.
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  #100 (permalink)  
Old 03-28-2011, 03:50 PM
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Ok, so the truck definitely "needs" to have an EGR. And it seem to be connected via a hose to the EGR TVS, which I believe is the manilfold-counted device that also runs the throttle lever actuator, aka "mystery dashpot", which is currently not hookeup.

By the way, the actuator is held in palce by a bolt. Even though I didn't install the actuator, this morning I went ahead and screwed the bolt back in its place out of fear of possible leaks.

Thanks V8!

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  #101 (permalink)  
Old 03-28-2011, 04:14 PM
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Anything made 1973 and later should have a EGR. Who ever put the performer on there just put the non EGR manifold because they are more plentiful.
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  #102 (permalink)  
Old 03-28-2011, 04:20 PM
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Quote:
Originally Posted by V8&4spd
Anything made 1973 and later should have a EGR. Who ever put the performer on there just put the non EGR manifold because they are more plentiful.
I am considering swapping it back to stock for "legal" reasons. I didn't do it before because I was considering a full 454 swap for more towing power, since they are becoming so cheap and plentiful with full smog equipment and accessories. But with the gas prices being what they are (and will become), might just stick with ol' 350.
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  #103 (permalink)  
Old 03-28-2011, 04:30 PM
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The manifold that came on your truck would be similar to this.
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  #104 (permalink)  
Old 03-28-2011, 04:33 PM
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The aluminum version can also be used.
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  #105 (permalink)  
Old 03-28-2011, 04:40 PM
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Quote:
Originally Posted by V8&4spd
The aluminum version can also be used.
I wonder how easy it is to locate one for the divorced choke style carbs. Or can the intake be easily modified to accomodate it?
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