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Unwanted EGR flow at idle, even in very small amounts, causes a type of rough running that may easily be misidentified as a lean condition (somewhat more likely in MAP-based fuel systems). Importantly, however, EGR faults of this type do not generally clear up with propane.
Subsequently, one may also ask, what problems does a bad EGR valve cause?
A faulty EGR valve can cause problems with the flow and operation of the EGR system leading to performance issues including a reduction in power, reduced acceleration and decreased fuel efficiency. It can also cause vehicle emissions to increase.
- rough idling or stalling.
- a smell of fuel.
- increased fuel consumption.
- pinging, tapping, or knocking sounds.
- failed smog test.
- Check Engine Light on.
Similarly, can a bad EGR valve cause coolant loss?
Loss of Coolant - all that coolant evaporating inside the cooler and then blown out through the exhaust will ultimately cause your coolant levels to drop. Now, a loss of coolant isn't always indicative of EGR Cooler failure, but when accompanied by white smoke, it's a pretty safe bet.
It can also burn holes in exhaust system components and destroy your vehicle's catalytic converter. EGR Valves allow burnt exhaust gases to reenter the intake manifold, causing a rich fuel condition by reducing the amount of oxygen.