Can bad valve lash cause misfire?
Thanks! Yes, tight valves can cause misfires. It is effectively the same as a bent valve because the valve is not sealing properly.
Why does my car run rough at idle?
Rough Idle. These valves have a small amount of clearance between the valve itself and the mechanism that activates the valve. This clearance is called “lash.”. If the valve lash is set incorrectly (too much clearance, or not enough), the engine may respond by running rough at idle, particularly while warming up.
What causes a dirty idle air control valve?
If you have an older vehicle, you may have a dirty idle air control valve. Some idle air bypass or idle air control valves can be cleaned. Others can’t. to learn more about idle air control valves, read this post. The mass airflow sensor (MAF) is located right after the air filter and is responsible
Why is the exhaust gas recirculation valve on at idle?
The Exhaust Gas Recirculation Valve is a vital emission control device. It allows the exhaust gas to enter into the intake manifold, with the sole purpose of reducing emissions from the motor. However, this EGR valve isn’t supposed to operate during idle, at wide open throttle or before the engine is warmed up.
Is the EGR valve supposed to run during idle?
However, this EGR valve isn’t supposed to operate during idle, at wide open throttle or before the engine is warmed up. If it runs at any of these times, the performance of the engine is affected.
Rough Idle. These valves have a small amount of clearance between the valve itself and the mechanism that activates the valve. This clearance is called “lash.”. If the valve lash is set incorrectly (too much clearance, or not enough), the engine may respond by running rough at idle, particularly while warming up.
What do you do when your Honda engine is at idle?
An easy way to find one of these faulty PCV valves is to pinch off the supply line to the PCV valve with a pair of pliers while the engine is at idle. If the idle smoothes out when you do this, replace the PCV valve with an OE unit.
Can a aftermarket PCV valve cause idle problems?
If you see an aftermarket PCV valve, exchange it for an OE valve. Believe it or not, I’ve seen idle issues caused by aftermarket PCV valves on Honda’s. The OE PCV valves last just about forever so you can easily justify the expense. I will admit however that the OE valves sometimes come apart internally and cause idle problems.
If you have an older vehicle, you may have a dirty idle air control valve. Some idle air bypass or idle air control valves can be cleaned. Others can’t. to learn more about idle air control valves, read this post. The mass airflow sensor (MAF) is located right after the air filter and is responsible