[*sean*]

@*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?)

Thanks,
Bryan

Hi Bryan,

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!

 

[joeaax1j]

Thanks @*sean*. This is interesting, and good to know.

 

[nasphere]

I bought a new EGR valve and flipped the wiper on it back in 2011. I put silicone bushing grease in it before sealing it back up and installing it. Zero problems with it to date, 10 years later.

 

[*sean*]

I bought a new EGR valve and flipped the wiper on it back in 2011. I put silicone bushing grease in it before sealing it back up and installing it. Zero problems with it to date, 10 years later.

Today I worked on V2 of my EGR tester, mainly because I stepped on it, and got to thinking about whether some of the noise problem was from oxidation and might be helped with dielectric grease. Well, this might be the answer.