The best way to check your fuel mixture is to use an exhaust analyzer, which most tune-up and emission-control shops have. Turning the screws out just makes it richer. Difficulty Starting Spark plugs are clean - No residue. I used a propane torch (unlit), but I didn't see a response from the engine. Another symptom commonly associated with a problematic carburetor is black smoke coming from the exhaust. Your engine running lean is always a symptom of another problem - it could be a dirty MAF sensor, a damaged oxygen sensor, or damaged fuel injectors.

It’s running lean.

A few times I turned the idle mixture screws in until they bottomed out trying to get it to "stumble" while running.Is it

My new 80555C idles best with the screws out only 1/2 turn, Holley said I may need smaller jets and my vacuum is borderline for the PV. I need the help of you guys to solve me problem with my Holley Street Avenger 570 cfm carb. Still no difference. The carb runs extremely rich at idle. Hi all.

I went from 64's to 60's and changed the power valve from the 6.5 to a 5.5. For a rich carburetor adjustment, turn the adjustment screw clockwise (in toward the carb body) a tad to eliminate a lean running condition. All adjustments should be made with a hot engine.

Wide open throttle yields no power. Typically, there’s a 12:1 or 15:1 ratio of air to fuel, and when there’s too much air or not enough fuel, it causes sneezing or popping sounds in the intake.
I have the idle mixture screws both turned just about all the way in and it's still running rich. Symptoms of a rich mixture can be misfiring and stalling at idle.

On the CV carburetor is the pilot adjustment screw (air/fuel mixture) also known as the enrichment circuit adjuster. Symptoms of Lean and Rich Reduced Power - Sluggish at certain RPM's. Typical symptoms of a rich mixture are: Poor fuel economy Sluggish acceleration Choke not needed from cold starts Sooty or black spark plugs Sooty or black muffler end pipes Strong smell of gasoline when the machine is at idle Uneven running (will often slow from regular idle rpms and then stop) Still ran rich.Idle screws wouldn't make it stumble when turned down every time. I've got a holley 600 vac secondary on my 355, it's got ported sportsman II's, a hot cam, single plane weiand, and true duals I've got a holley red pump and regulator, set to 5 1/2 psi.. fuel level is below the sight plug on the float, adjustment screws are about as lean as you can go on the carb I turned the idle stop screw out to slow it down to 1000 and 750 rpm in gear.
Copious amounts of black smoke from the exhaust pipe are a tip-off to this condition. Black smoke coming from the exhaust is an indicator that the engine is running excessively rich, or using too much fuel. Whatever the problem is, recognizing when your engine is running lean is important for maintaining the health of your car. 1: Bad Performance. Your car will have less power than it had before. In addition the vacuum is super low (7-8 inHg). Black, puffy exhaust and carbon-fouled plugs are the hallmarks of a rich running condition. Here's the situation. Failures in the carburetor float, needle valve or seat can cause unrestricted fuel to enter the bowl. Pilot Screw. Even though the fuel pump is a stock mechanical type, I installed a fuel pressure regulator and set it at 5 psi.

I can smell it and the spark plugs are dark. First I thought a vacuum leak. An engine “runs lean” when the balance of fuel and air gets thrown off.


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