Clean AGR Valve Without Removal

Are there any positive experiences with additives like Mathy AGR cleaner?

I searched in vain for an official proof of its efficiency.

Hello Andreas,

"All the AGR systems I've heard about that were described as 'defective' had mechanical problems. Therefore, I wouldn't expect too much, even if there were any significant cleaning effect at all. I simply can't imagine how a heavily carbonized sludge could be removed in a short time without mechanical action or the harsh side effects of aggressive chemicals."

A clogged EGR valve would be indicated by the actual mass airflow values. You can identify this in a mass airflow log by observing that, even though the EGR valve duty cycle is at its maximum, the actual mass airflow value is still slightly higher than the target value.

Best regards, Rainer.