159 Cruiser and
AO Silver Member
Join Date: Jul 2012
Location: United Kingdom
Confusion about EGR valves
Yeh, part of the problem is the EGR gets slower and slower to react, looking at the mechanism ( when you take the solenoid off) is that it can only really fail open as the soot collects in there, then the main problem is the solenoid ( the pin) in the EGR corodes with the acidic gases etc produced in the exhaust, and gradually gets worse and worse.
Make sure you clean your map sensor too, this is an easy way to see how cruded up your manifold is. You get soot from the EGR and oil from the crankcase breather ( that going in through the turbo).
The good news is with a bit of time, the oil and pressure can help to clean the manifold, esp with a bit of cleaner sprayed through the available ports ( I suggest EGR cleaner as it's designed to be ingested by the engine). The engine just gets smoother with time.
Any spelling/ grammatical errors are purely there to annoy!
159 1.9JTDM Ti and Giulietta 2.0 175 Speciale
ex: Punto 55s, Golf Mk5 1.4FSi, A3 (8P) Sportback 2.0TDi SE, A4 (B8) 2.0TDI S-Line, 306 HDI Meridian, Giulietta 2.0 Velocec