Do the EGR solenoids work? My simple test.
After reading of several ways to check whether the solenoids activate, it dawned on me
Using two clip leads, I connected a 9 volt + (positive) to the EGR input pin "D" then using a paper clip attached to the - (negative) on the other clip lead, I momentarily touched the remaining three pins, A, B, C, which are the negative sides of each solenoid. At each touch I got a healthy "click" from the solenoid activation.
That simple solenoid activation (click) doesn't tell me anything about how the PCM/EGR
EGR Base Gasket Leak
Another source of confusion is the Base Gasket.
But don't confuse an advertised Base Gasket with the
Some advertisements are selling Insulator Gaskets but calling them Base Gaskets. According to Tomco, Inc,
HELPFUL TIPS from TOMCO
1994 Oldsmobile Cutlass Ciera S 3.1 V-6 Engine Code "M"
My Digital EGR
My EGR remarks don't cover subjects such as carbon buildup, PCM (computer) problems, other sensors, or mechanical problems that might interfere with the EGR.
There are literally thousands of posts on the Internet that explain all these subjects
Here is the original EGR as it was while on my engine. See the "crud"
leaking around the base plate? That is evidence of a leaking Base Gasket.
Below is a picture of the same EGR after it was removed from the engine. The "crud" is all around the EGR base.
The screws were all tight so the gasket
itself had failed.
The leaking Base Gasket cannot be purchased according to Tomco Tips (see quote above).
Above is a picture of the old EGR bottom with the Insulator Gasket still attached. The Insulator Gasket is available at most auto parts stores but don't confuse that gasket with the Base Gasket. All that black stuff is carbon buildup that has blocked the passageways through the EGR. This is the condition of my old EGR after 118,000 miles of use.