> Something else that is worth mentioning is that if your EGR is not working
> correctly, the motor will want to ping when it is hot. If it pings when cold
> then the problem is likely to be somewhere else. You can do a quick visual
> examination of the valve by having someone rev the motor and seeing if the
> diaphragm moves freely. However, the valve could be working and yet the
> exhaust passages or intake manifold passage is clogged with carbon.

You should also be able to reach under the EGR valve and gently push up
on the diaphragm with a finger. (If the engine is running it should
stall.) It should move smoothly. If not it might need cleaning which you
should be able to do yourself. Spraying WD40 on the underside of the valve
can free up the stem but you should be able to take the whole thing off
and clean out the carbon with solvent (eg paint thinner).



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