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Had a miss, put new disturber in now miss is gone, but now running fuel very rich on a T,B,F,I, carb

Rich fuel burning

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Get the timing right ,on idle 6/8? btdc (unleaded)95

Posted on Nov 22, 2014

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I tried the coil that didn't solve it


Look at this forum for tractors.
I hope it helps you!

http://www.tractorforum.com/f192/ih-674-78bhp-running-under-load-issues-17715/

Another thing that can cause this is the carb. It may be getting too much fuel once it's warmed up. An engine needs more fuel when it's cold than it does when it's warm. Cold engines run inefficiently so they need more raw fuel to fire-up, and stay running. This is all a choke does. A choke plate closes-off the air going into the carb which makes the fuel mixture really rich so it can run. Less air = more fuel. You'll also notice that cars with chokes also idle real high until they warm-up. This fast idle and the over rich mixture (due to lack of air), allows the engine to fire up and stay running. As the engine warms-up and starts burning fuel more efficiently, the choke plate begins to open, which slowly lets more air in and leans-out the air/fuel mixture. Once the engine is warmed-up, the choke plate will be wide open allowing the carb to run as it is supposed to with the correct metering of fuel and air.

Jun 11, 2015 | Cars & Trucks

1 Answer

My seadoo900 has one carb and one plug is ok it has a brown burn the other is sooty black


sooth black indicates rich fuel burn-- air / fuel mixture is too rich . Check for blockage (air filter)

Mar 11, 2014 | Cars & Trucks

1 Answer

Carberetor stalls up hill


at WOT? too? wide open throttle or just cruise up.?
i can do carbs, 50 years. expr.
1; CHOKE OFF, or it floods. and stalls.
2: float level too low,
3: fuel pressure too low , causing # 2
4: fuel pressure too high causing flooding.
(or float valve stuck open do to bad or too much fuel pressure !!!)
5: main jet filthy ( are not all,that way by now?)
6: power jet dead.
7: air emulsion tubes or jets, clogged.

the trick is to find out , IS IT too lean, or too rich, (or spark bad)
bad spark plugs just head hills. (they love to fail old under higher pressures)
so spark is first, no carb on earth works with bad spark
can burn gas with out perfect spark and timing. of it.

there are tests to do that finds the Rich /lean truth.
i use hand held propane gas, i crack the valve on the fly
and if power returns, its lean.
if not , its not lean. but maybe too rich.
for rich , (no 5gas dyno or wideband 02 bung)

i read spark tips, like the olden days. (fun for some)
in fact we'd fly up a hill, and park fast. stalling engine,
fast, and then pulling spark plug (any) is it black or white.
white, lean
black is rich missing.
love my wide band sensor, no more doing that. (a tool)

ive also done same and checke float levels. oops got bad fuel
even algae or rust in fuel bowl.
i cut the ignition on the fly and found bowl near dry.
bingo, fuel starvation
took a new gas tank to fix this car. (or total refurb)


Jan 13, 2014 | Toyota Pickup Cars & Trucks

1 Answer

1984 Nissan 720 4x4 starts fine but runs rich, misses, sputters. New distributor, plugs, wires, cleaned fuel tank.


check pvc and check for air leaks around intake and carb gasket use a little carb cleaner if engine sputters while spraying u have a leak

Aug 09, 2010 | 1984 Nissan Pickup

2 Answers

Oxygen sensor i am having problem with


MANY THINGS WILL CAUSE RICH FUEL MIXTURE PROBLEMS.LIKE INTAKE MANIFOLD VACUUM LEAKS.EVAP CANISTER FUEL SOAKED.LEAKING EXHAUST MANIFOLD AND EXHAUST PIPES.LEAKING EGR VALVE GASKET.FAULTY FUEL PRESSURE REGULATOR. FUEL CONTROL SENSORS OUT OF CALIBRATION LIKE THE ECT IAT MAF SENSOR AND FAULTY STUCK OPEN FUEL INJECTORS.

Jun 03, 2010 | 1997 Cadillac DeVille

1 Answer

My 87 wrangler runs rich, idles rough, runs rough. guy put on an electric fuel pump. original carb. he said it needed a fuel pressure regulator. is he right?


sounds like it is flooding the carb, by putting a fuel pressure reg on it it will lower the pressure at the carb and stop overriding the float,needle and seat.

Feb 17, 2010 | 1987 Jeep Wrangler

2 Answers

Running rich


clean the MAF sensor with some carb cleaner... be carefull not to break the thing wires going across the opening... remove clean the EGR valve and replace them. check for vaccume leaks... best way is with carb cleaner... but be sure not to spray the exhaust and away from intake so it dosnt grab any of it and botch yr results. gl

Dec 21, 2009 | 1992 GMC Sierra

6 Answers

My 88 isuzu picup. How do I adjust the idle speed?


I just repaired my '94 and it had similiar problems. Too much fuel was flowing through the carb. Mileage dropped way off.

I rebuilt the carb but the real problem was a bent tang on the float. This resulted in the failure of the needle valve to close completely, regardless of the float level.

Nov 11, 2009 | 1994 Isuzu Pickup

2 Answers

My weber carb is burning a lot of fuel and is running rich, what is wrong with the carburetor? It is the replacement carb for the 1984 Nissan 720 pick up truck with the 2.4L NapZ motor. I haven't used the...


fuel will turn after a while from setting sounds like might have set up on the float in the carberator and may have made the float heaver and not letting it close the fuel off when the float bowl gets full . Causing it to use more fuel would need to check the proper hight of the float

Oct 14, 2009 | 1984 Nissan King Cab

1 Answer

I have a 99 gmc sierra with 5.3 it takes about 7 seconds to start


Needs a valve adjustment. I assume its EFI, eliminating the possibility of the carb.

Sep 04, 2009 | 2000 GMC New Sierra 1500

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