So I know the main purpose of the EGR valve is to recirculate some exhaust to the cylinders to reduce NOx emissions. However, a mechanic told me that a malfunctioning EGR valve can make the engine run way hotter, and that this can damage the pistons, or other components of the engine, over time. Is that true?
Interesting that the 100 and 106 CI Victory V twin has no problem overheating with an oil cooled engine and the STOCK 92 CI Victory produces more HP that the guy with the 103 CI Screaming Eagle HD. Add a oil cooler to the HD and it will not overheat but still gets blown away by the Vic. That 103 and 110 CI upgrade is the biggest ripoff they have going and creates more of an overheating problem than the stock engine. They overheat because the engine is an ancient design that has been stretched to its limits in an attemp to keep up with bikes like the Victory. By the way the Robb Report just named the 2009 Vision best touring motorcycle and it does not overheat either.
sorry dave. i inadvertenly gave you a bad rating. if the question asker, or someone at answers can, please change my vote to thumbs up. dave nailed it 100%
Well some what true an egr mifht create a vacuum leak making the engine run faster but to burn a piston it woul have to be close to the cyl like a intake leak easy way to check for vacuum leaks is to take a can of carb clean and spray down the intake and listen for idle change (don't spray dist)
Yes. An EGR valve reintroduces exhaust gas to cool the combustion chamber, making it run cooler, due to less oxygen. Oxygen burns hotter than fuel. So if you have a faulty egr valve, emissions will go up, and you run the risk of overheating and damaging the engine. It could cause the pistons to expand, or seize, due to higher temperatures. It was not as much of an issue in yesterdays cars, because they had much lower compression. Now tolerances are tighter, but metallurgy is also much better. It still does run the risk of running hot, and causing predetonation, which would destroy pistons and other engine components such as the crankshaft, and valves.
Yes, very true. It would help if you stated what vehicle it was for. But let's say it's a Ford F-series truck with the 6.0L diesel, highly known for this problem. You can actually purchase an EGR delete which actually bypasses the valve so it won't burn the piston rings (the actual part that burns up). Buying this item only costs a few hundred and will save you thousands in the long run.
