Quadrajet air leak fix and warped air horn repair tutorial.
How to identify a Quadrajet with a warped air horn without diss assembly or
running it on a car. These tips would have saved me time and money which is
why I made this video. I also discus how to repair a warped air horn and
prevent your air horn from warping in the first place. If you have a
whistling noise just off idle then you got some work to do. You will never
get your engine tuned right, your cold start performing or decent fuel
economy unless your four barrel carburetor is just right. Special thanks to
Cliff Ruggles for his book Rochester Quadrajet carburetors and to my
brother Adrian who spent hours on tuning and fitting.
See this video for description of the technique I used to straighten a
warped air horn.
here is a technique for re-bushing the throttle shaft without drilling.
How to measure and adjust Quadrajet float level
I have had several requests for this, so here you go:
1. The airhorn has to be removed to do this, but the carburetor does not
have to be removed from the engine.
2. Some data says to measure from the toe(end that is opposite from the
hinge), some say 5/16 inward from the end, etc. I suggest following the
specs for your particular carburetor.
3. With the float in the raised position and the inlet needle lightly
seated, measure from the top of the float to the top edge of the carburetor
with NO gasket in place. If you have to adjust the float, bend at the area
that has the cutouts,
4, If you are experiencing flooding issues then it is an excellent time to
install a new needle/seat and float and that should cure flooding problems
that are not choke-related.
See 1976 Chevrolet pickup with Rochester quadrajet upgrade on SBC 350 V8.
We removed the hood, mounted a camera looking down on the air horn, and
took it for a spin, running wide open on an uphill grade. See how the
secondary air valve responds to rpm drop at each upshift of the THM. Also
included is a smoking burnout.
how to minimize engine bog with a Quadrajet carb
this is to minimize engine bog when the pedal is to the metal. do not over
tighten, very small spring...you want to try 1/4 turns or 1/2...q-jets are
good if tuned properly. also when you are tightening screw it will have
tension on it so keep the screwdriver firm. 1986 gmc sierra single
straightpipe to cherrybomb. you will need a small flathead screwdriver and
a 3/32 allen key. be sure not to tighten to much or else your vacuum
secondary flaps wont open.
Decoding a Rochester Quadrajet part 1: The name
Rochester Quadrajets tend to mystify people because of the various model
names assigned to them by GM.
Add to that a redesign in the '70s and the confusion only grows.
In this video we'll learn the different model names and also how to
differentiate between early and later-model Qjets. Enjoy!
Clean a Carburetor Without Rebuilding it and Save Money
Do you own a car or truck that has a carburetor. Are you trying to get your
car to pass a smog check. Do you think you need a tune up.
Have you noticed that on youtube that other videos show you how to clean
the carburetor choke, but that does not clean anything inside the
carburetor. So the other videos don't really help you make your car run
In this example the Holley 2150 2 barrel carburetor, on a 1979 FORD 302 or
5.0 litter engine.
How to clean a carburetor cheaply and without having to remove it from the
engine. This is a way that I avoided having to rebuild my carburetor due to
it not working correctly. The problem that I had with mine was that when I
gave it the gas it had a dead spot. In other words I'd be going along and
give it the gas and it would cough and stall. A friend showed me that by
only squirting carburetor cleaner into the fuel bowl and running the engine
that it would clean it out.
I tried what he told me to do. I ran about half a can of carb cleaner
through the carburetor with the engine running and then went for a drive. I
got down the road about a mile and entered into the freeway. There was a
car coming fast and I was not up to speed and I gave it the gas and it
stalled like it used to. I put the transmission into 2nd gear and floored
it and that blew out what ever was plugging it up and it has run like new
since. This solved the problem I was having, does it sound like a problem
you have. Give it a try.
If you try this and it works then you have fixed your problem for under 5
dollars, and won't spend hundreds of dollars having a mechanic work on your
car. It also helps if you do this before going for a smog check, it will
help you pass.
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