What happens when the EGR valve is opened?
What happens when the EGR valve is opened?
MAP sensor – if the EGR valve is vacuum controlled the PCM will read changes in the MAP sensor output in response to exhaust gas recirculation. The voltage from the MAP should increase when the EGR valve is opened. Above is a diagram of an exhaust gas recirculation system (Ford with DPFE).
What is the diagnostic code for excessive EGR?
It is one of the generic diagnostic trouble codes in a number of makes and models that are related to the vehicle’s EGR. Code P0402 indicates that your car computer has detected excessive EGR.
How is exhaust gas recirculation ( EGR ) test done?
In an EGR system there is a pipe which comes off the exhaust manifold. The first EGR system tests you should perform are EGR idle tests. Both tests involve leaning the engine at idle by allowing exhaust gas to enter the engine through the EGR system. Apply vacuum to the EGR valve at idle.
How often should I Have my EGR valve cleaned?
The excess flow of exhaust dilutes the amount of oxygen available in the air-fuel mixture, leading to rough idling, misfires, and even engine stalling. To prevent build-up from affecting the performance of your EGR valve, most experts recommend having your EGR valve cleaned and inspected about once a year. 2. Dirty Air Filter
It is one of the generic diagnostic trouble codes in a number of makes and models that are related to the vehicle’s EGR. Code P0402 indicates that your car computer has detected excessive EGR.
MAP sensor – if the EGR valve is vacuum controlled the PCM will read changes in the MAP sensor output in response to exhaust gas recirculation. The voltage from the MAP should increase when the EGR valve is opened. Above is a diagram of an exhaust gas recirculation system (Ford with DPFE).
What’s the problem with the EGR valve on my F-150?
Have an F-150, 2002 year, 54k miles and just replaced the EGR valve. But still getting errrors for both: P0401 Insufficient EGR Flow P0402 EGR Flow Excessive at Idle What would fix both an insufficient and excessive flow?… I have an interestingly annoying problem.
What causes the EGR temperature sensor to get stuck?
The EGR temperature sensor is registering too much of a temperature change when the EGR valve is opened from a partly blocked exhaust catalyst causing excessive back pressure in the EGR system. The EGR is stuck open due to binding or carbon deposits holding the valve open. What are the symptoms of the P0402 code?
