Discussion Starter · #41 ·
Hi Bryan,@*sean* (or others), is there a consensus from this testing whether EGR valves start to go bad, BEFORE the "herky jerky" starts? If so, are there any symptoms, other than herky jerky, that a driver should be watching for?
(I suppose I'm just curious if there would be any reason to replace an EGR valve if a driver isn't experiencing herky jerky and wasn't having problems getting into lean burn?)
Yes, the valves can definitely degrade and eat away at your mileage before herky-jerky starts and before they throw a code. I have recorded evidence of a badly performing stock valve that when measured at around 150K miles with my EGR valve tester was found to have an improperly performing sensor. No codes or herky-jerky. Replacing it was responsible for a few MPG improvement. I've tested a purportedly younger valve that had similar degradation. Hope this helps!