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Qiu Lin writer Kim Moon House
EGR valve works Symptom: closed-loop catalyst group control catalyst group of the electronically controlled fuel injection engine at high speeds everything is normal, but after decelerating engine idling shake, severe catalyst group flameout, especially after rapid deceleration prone to this failure. This failure occurs when the engine is accelerated with normal, intermittent slowdown is normal, cold car no such failure. Maintenance of the engine, after replacing the sensor, the problem persists. `(X / u # c Troubleshooting: This failure is usually due to an engine EGR (exhaust gas recirculation) control system for poor work, causing the engine intake system leak (ie vacuum leaks), leaving the engine shake increases, intermittent stall. 3 M1 ph, I3 n9 Y in the form of 'G engine used on the EGR control systems vary, but it works, working catalyst group conditions is the same .EGR system used on cars generally have the following three kinds: (1 ) temperature control valve Q. [8 ^ 1 T (2) vacuum solenoid valve 9 i1 W:. k, a; a1 `. 'O5]! $ V O" d) _,} (K2 O1 y + g7 k' ? (3) controlling the solenoid valve. + t2 j3 W $ `5 E + @ additional means has an exhaust gas temperature sensor, EGR EGR position sensor and a temperature sensor. purpose of which is to reduce the exhaust catalyst group gas temperature and reduce atmospheric pollution. : ~ 3 w3]; Y0 e (} 4 C 6 m0 l% S + D t2 O working conditions: the engine to normal operating temperature, catalyst group the speed ECU settings 6Okm / h or more (all cars are not the same), or when the engine accelerates When the engine when decelerating or release the accelerator pedal, EGR valve is closed EGR valve return if the time is not good, close lax, too much coke or valve stuck; when 3000r / min or more, EGR system to work. , will result in the failure, and makes the operation of the engine is bad, or even extinguished jitter "UZ, t & M v0 V4 W) ~ exclusion method: As the EGR valve is mounted catalyst group on the engine block or exhaust pipe end portion, and its working temperature catalyst group is very high, Maintenance should check valve if there is carbon, the return is good, and to check their work, if you find bad EGR valve operation, catalyst group must be replaced.
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