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EGR causing 4.2L Engine to shake ??
2000 E150 4.2L V6 (146,000 Miles)

The EGR system starts working when coolant sensor says 115 F then at 1950 to 2050 RPM engine starts to shake like a front loader washing machine!!! In Drive the most in Park a little.

Changed the EGR valve, DPFE sensor and EGR control solenoid. Checked voltage to DPFE bottom wire (Ref) 5 vdc but top wire (Sig) fluctuates between 1.05 vdc and 1.8 vdc with different throttle positions. (I thought its suppose to be between 5.0 vdc and 6.0 vdc but that would be impossible with a 5 vdc supply) If I disconnect the vacuum hose to egr valve and plug it or if the coolant temp is below 115 F the van doesn't shake.

We checked the EGR tube and vacuum hoses all ok. Secondary butterfly valves open fine at correct RPM. New Spark plugs, wires and coil. Had our mechanic run scanner and tests, not a thing showing. When the DPFE sensor was changed on first startup it threw a 1401 code. But never did it again. No air leaks on egr valve gasket, checked all wiring connections, checked everything but vacuum reserve tank.

WE HAVE NO CLUE WHATS WRONG. runs GREAT at Idle. with and without EGR connected. Need help. Thanks

The engine stumbles maybe every 50 miles. I have replaced plugs, wires and a fuel pump, it has about 90,000 miles on it. I had a shop put in a remote alarm system for me about three years ago, they must have disconnected where you read the codes (it does not work). Any help would be useful.

I have changed the thermostat,heater hoses are hot and in good condition. I have a blend door switch and and a selector switch coming in the mail and the door actuators seem to be working fine. No codes on my scanner. Any suggestions on what I'm missing?

Thank you
Barry Brown

Two different car parts places scanned my van and received no codes from my system--they thought loose wires under dash (I don't believe it) or a blown fuse for the diagnostic system--I don't know what fuse that would be or how it would be listed

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