How is fuel delivery controlled by EFI throttle bodies?
Fuel delivery is controlled by the electronically operated injectors. EFI throttle bodies are sized larger (in terms of available airflow) to provide greater latitude for a range of air delivery requirements. The engine will pull only as much air through the throttle body as it needs.
Which is responsible for idle quality in an EFI?
In other words, the Base Fuel Table is responsible for idle quality, and the self-tuning is responsible for WBO2 compensation. So the idle area of the Base Fuel Table needs to be blended smooth (using the Fuel Graph) to promote a smooth idle, for the same aforementioned reasons.
Can a car stall with a bad throttle position sensor?
The engine can stall for no reason and without any warning. This happens when the TPS gives incorrect information to the ECM. The engine can stall at high speed, at low speed, or even at idle. A faulty throttle position sensor will not let your car accelerate normally. Though this doesn’t happen all the time.
What causes idle surges on a car ECM?
Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges.
In other words, the Base Fuel Table is responsible for idle quality, and the self-tuning is responsible for WBO2 compensation. So the idle area of the Base Fuel Table needs to be blended smooth (using the Fuel Graph) to promote a smooth idle, for the same aforementioned reasons.
When does a car cut out when you give it throttle?
It will cut out when you give it throttle, it always is preceded with one hesitation. When acceleration is applied it staggers and farts, until you let off the throttle, then it will run fine at an even RPMs until accelerator is pushed. It will always start right up if it dies and will idle. And run when stopped, in neutral or in gear and rolling.
When is a bad throttle position sensor a warning sign?
Engine won’t idle smoothly, idles too slowly, or stalls If you start to experience engine misfires, stalling, or rough idling when the car is stopped, it can also be a warning sign of a failing TPS. You don’t want to wait to get this checked out!
Why does my Stihl saw keep stalling when I pull the throttle?
If the saw is stalling when you pull the throttle trigger or it doesn’t reach its full power, adjust the high-speed (H) screw. Adjusting the low-speed (L) screw also may help with smoother idling or if the saw cuts out at the moment you pull the throttle.