What should my AFR be at idle?
What should my AFR be at idle?
How does it affect performance?
| Gasoline AFR | Methanol AFR | |
|---|---|---|
| Cruise | 14.7-15.5 | 6.4-6.8 |
| Idle | 13.5-15.0 | 6.0-6.6 |
| Stoich | 14.7 | 6.4 |
| WOT | 11.5-13.3 | 5.1-5.8 |
Is the SBC 350 engine running very rich?
The engine has run very rich since I bought it 6 months ago, and no amount of idle screw adjustment seems to have made any difference. I am running AC 44TS plugs, gapped at .035, and they are very sooty/ black when I inspect them.
Why is my engine running with a rich mixture?
If one injector is not flowing as it should or is stuck open, it might cause a rich mixture in your engine. If you think that your engine is running with a rich mixture, there are some things you should check to confirm this.
What should I do if my engine idle is not the same?
If they are not the same, set them at 1-1/2 turns out (counterclockwise) from fully closed. If the engine idles better, then carefully turn all four of them in (clockwise is leaner) about 1/16 th of a turn and evaluate the change on your vacuum gauge.
How to know if your engine is running rich?
7 Symptoms of an Engine Running Rich. 1 Check Engine Light. 2 Fuel smell from exhaust. 3 Constantly refilling your gas tank. 4 Poor engine performance. 5 Black smoke from the exhaust. 6 Sooty spark plugs. 7 High carbon monoxide content.
The engine has run very rich since I bought it 6 months ago, and no amount of idle screw adjustment seems to have made any difference. I am running AC 44TS plugs, gapped at .035, and they are very sooty/ black when I inspect them.
If one injector is not flowing as it should or is stuck open, it might cause a rich mixture in your engine. If you think that your engine is running with a rich mixture, there are some things you should check to confirm this.
If they are not the same, set them at 1-1/2 turns out (counterclockwise) from fully closed. If the engine idles better, then carefully turn all four of them in (clockwise is leaner) about 1/16 th of a turn and evaluate the change on your vacuum gauge.
