What Is An EGR Valve? EGR valves are a common point of failure on most modern diesel engines. When the valve sticks, it triggers the check engine light and decreases power. Simply replacing the valve isn’t enough to protect your engine, since failure is usually caused by problems with ot...
How To Spot A Faulty Valve Because the exhaust system is pretty hostile, your valve will eventually succumb to wear and tear. The build-up of carbon particles along the EGR and intake systems is usually the single widespread cause, which leaves it stuck in an open or closed position. ...
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The EGR vacuum will not operate if the power control module does not signal the solenoid to switch it on. Also, faulty wiring of the solenoid can cause over-stimulation of the vacuum, creating a stronger suction than needed. As a result, the EGR valve may become clogged or open too widel...
For example, multiple sensors or actuators can cause an engine surge when there is a fault in the following components: TheEGR valve An oxygen sensor Throttle position sensor (TPS) Manifold overpressure sensor (MAP) Vehicle speed sensor (VSS) ...
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EGR Valve At idling, theEGR valveis in the closed position because of the spring pressure and lower ported vacuum. The engineers designed it so because if the exhaust gases recirculate at the idling, then it would cause rough/erratic idling. Upon opening of the throttle applies the ported vac...
Companies of course take the quickest/cheapest option, often stuffing things in hard-to-get places (the specific example I've seen is the EGR valve, modern ones are extremely reliable and simply need to be removed, cleaned, and rein...
(1) TheEGR valvethat is not working. The EGR valve is supposed to open when the engine is accelerating or lugging under a load. This allows intake vacuum to suck some exhaust in through the EGR valve to dilute the air/fuel mixture slightly. This lowers combustion temperatures and prevents ...
Check ignition timing -- if possible (should be checked even if it is not adjustable to detect possible computer or sensor problems) Operation of theEGR valve. OTHER TUNE-UP CHECKS In addition to these performance checks, hoses and belts should be visually inspected. ...