Cel code 401, 95 Marquis, 99k, 4.6. Check engine light (code 401) has been on for a year. Maybe once every 2 months cel light will go off for a couple days and then come back on. Car runs smooth at all speeds including idle. MPG has dropped from 27 to 23.
Put hose on EGR valve, sucked on it while engine idleing and warm, heard it click each time I tried sucking, engine continued to run fine (red flag?). Pulled off green hose on EGR valve, (which comes from EGR vacuum solenoid, put finger over it and felt a very slight pulsating vacuum.
Question 1. Could that solenoid valve be the problem or was it my EGR 'suck test' showing that the EGR valve is bad. If that is actually a proper EGR test, since engine runs smooth at all speeds? I think I am getting something backwards.
Question 2. Are the EGR vacuum solenoid, EGR position sensor, and DPSE sensor 3 different items? After readin many posts, I'm a little confused as to even locate them on my car. Thanks for any feedback.
have the same problem?
Saturday, March 10th, 2007 AT 6:03 PM