1996 Nissan Quest - EGR drive cycle difficulty
cant get EGR to complete. no codes. followed nissan specific Pattern # 19 --still not clearing. Manuall vacum-egr almost stalls engine. receives 5inHg. Solenoid operates EGR ok...
Nissan decided do not run the monitor if the egr flow is poor , if the temperture does not drop in the software programing , with the output of time program dors not run monitors no check engin lite . those Nissan with system operating correctly runs in about 10 minutes,
Agree. My ECT normal oper was 194F ….the drive cycle required is 158F plus…i was good there. ——ill monitors completed Except EGR - there is a excemption 1 monitor not ready is ok for Smog. So i did smog and it passed….>>> but STILL WANA SOME INPUTS on EGR from you guys.
You can tee Into the vacuum hose at the egr and tie to the egr temp sensor then drive the van while watching the vacuum, when the vacuum increases the egr temp sensor should respond to the egr opening. You will know for sure if you have a working system. Hope this helps Fred
Yes sir. thats how i saw its getting 5in Hg —but couldn’t really find specs what it should be there—-but compared to other cars it seems to be right.
Is not only the vaccum getting there , but is timed the activation of the solenoid vs x amount of temperature changes , in this case vaccum over time / changes in temperature
Hmm you made me thinking… if its using tempeture sensor instead of O2 sensor to check EGR operation (than there is …i can tweak n make it work…) <——-not really a hack but at least a way to verify myself thats the problem….
I do not know exactly if that egr system performance on your vehicle is monitor by the map sensor o egr temperature, how ever is a matter of changes in temperature when the solenoid iss comanded on or off,
You bring back fond memories of a weeks long struggle with a Mercury Villager that I had years ago in my Ford days for a very similar issue. I'm not sure if the Ford set criteria would have any information on this. As Joel stated the EGT response in conjunction with valve opening is critical. On my nightmare the ECT had a winter coat of carbon causing it to not respond properly, but not enough…
All great tips. Closing case