Car Injector?

Question

I my car engine stops some times in a traffic or when i slow down the vehicle.This is happnning when i slow down my RPM is getting below than the idle value? IS this some thing to do with car Injectors? Or some thing to do with fuel filter?

Its a NISSAN Sunny FB14.. This normally happnning when i slow down the vehicle... But if i change the gear from "D" to "P" or turn off the Air condition unit when it trys to stop the vehicle the RPM is comming to normal value and engine is wrking fine. Other wise the engine gets stops.

Answer 1

You didn't state the year but it's more likely your car has a computer ECU. The ECU controls the idle RPM. When you load the engine with the transmission D-gear drag or the AC, the ECU senses a drop of RPM and it tells the injector to increase the injected fuel.

The idle speed stays steady with no load (when in P and no AC) that means the ECU can still count the pulses to know the RPM. Only when the in D or using AC, as the RPM drops, the counter-acting increase of fuel is not effective. This means one of the following three possible sources of problem that you need to eliminate:

(1) Fuel level and its increase are not as much a the ECU was calibrated with: fuel filter or injector flow restrictions--as you suspected.

(2) Fuel is sufficient but the engine does not use it effectively: misfiring--spark plug or cable high-voltage leaks, poor firing timing, or low engine compression--dirty air filter.

(3) The drag of the D gear or the AC are unusually high: transmission fluid degradation, AC compressor bearing broken or freon overcharged....

Good luck!

Answer 2

Your car is talking to you. It is saying take me to a mechanic ASAP.

Need more info. Make, engine, mileage, other symptoms, what maintenance has been done.