What are the symptoms of a faulty exhaust valve in a Haval H6?

[VonAdriana]

When the car's exhaust valve is faulty, excessive exhaust gas is directed into the engine's cylinders, which will affect the normal operation of the engine. 1. Symptoms: If the exhaust gas recirculation (EGR) valve is stuck in the fully open position and cannot close completely, it will cause the engine to stall at idle or experience unstable idling. It may also result in the emission of large amounts of black smoke during engine operation. Moreover, once this issue occurs, it won't just produce black smoke but will also be accompanied by a decrease in engine power. 2. Impact: Particularly when the engine is idling, operating at low speeds with small loads, running at high speeds, accelerating or decelerating rapidly, or when the engine is cold, excessive recirculated exhaust gas will severely impact the engine's performance. This can lead to issues such as unstable idling, poor acceleration, increased fuel consumption, and insufficient power.

[DelGideon]

If the PCV valve fails on a Haval H6, the symptoms become very noticeable. I've experienced this firsthand - at idle, the engine shakes like a tractor, with noticeable vibration through the steering wheel, especially uncomfortable at red lights. Acceleration becomes sluggish, with delayed throttle response that makes overtaking feel risky. Fuel consumption spikes dramatically, potentially increasing from 9L/100km to 11L/100km, hitting your wallet hard. The most serious issue is oil burning, evidenced by blue smoke from the exhaust and rapidly dropping oil levels on the dipstick. Prolonged neglect leads to severe carbon buildup in the engine, resulting in much costlier repairs later. Getting it inspected and replacing the faulty valve promptly is absolutely crucial.

[VonAliyah]

There are three main symptoms of a faulty exhaust gas recirculation (EGR) valve on the Haval H6. First, an imbalance in crankcase pressure causes severe idle shaking, with the tachometer needle fluctuating wildly, potentially triggering the engine malfunction indicator lamp. Second, abnormal oil consumption occurs, where you may notice oil being used up twice as fast as usual, accompanied by blue smoke from the exhaust tailpipe, indicating oil being drawn into the combustion chamber. Third, power output is affected, with reduced intake efficiency during acceleration, resulting in noticeable throttle lag. If left unaddressed for an extended period, excessive oil vapor can form gummy carbon deposits in the throttle body and intake tract, clogging fuel injectors. It is advisable to also inspect the PCV tubing for cracks, as prolonged neglect of this issue can damage cylinder compression and the catalytic converter.

[DelIsaac]

Exhaust valve failure should most alert you to oil burning issues. My Haval H6 experienced blue smoke from the exhaust pipe, losing half a liter of oil every 1,000 kilometers, with particularly severe carbon buildup. Idle vibration was also very noticeable - the seat would shake at red lights, and RPM would fluctuate erratically. Fuel consumption increased accordingly, costing 20% more for daily commuting. Additionally, the engine sound became muffled, with noticeably weaker acceleration when pressing hard on the throttle. These problems all occur because the valve cannot properly regulate crankcase pressure, leading to abnormal oil-gas mixture. If not replaced promptly, piston rings may get stuck by carbon deposits, eventually requiring major engine overhaul.