Will Cunningham
Member
My 2016 Expedition 4wd seems to want to engage and 'growl' when first driving and turning. Sound mostly on the front drivers side, but have not had someone listen on the passenger side. I have replaced both IWEs and vacuum solenoid and hoses. Checked the vacuum on both IWEs per the Technical Service Bulletins and they check out with no vacuum loss over even a 3 minute test. 4wd engages and disengages properly, so think my switch is good. Tested the vacuum both in 4wd and out with proper results. I have not replaced the long hoses to the IWE since there did not seems to be any vacuum leak during testing on the hose or IWE.
Baffles me since it sounds a lot like the noises of 4wd engagement I heard prior to IWE replacements. The problem seems a lot less after I have driven for 5-10 minutes, but not always. If I drive straight ahead for several hundred feet before turning like at at traffic light before I turn, there is usually no problem. My guess is insufficient vacuum at times, but my test results do not indicate that. Suggestions appreciated and solutions would be great!!!
Thanks in advance!!!
Baffles me since it sounds a lot like the noises of 4wd engagement I heard prior to IWE replacements. The problem seems a lot less after I have driven for 5-10 minutes, but not always. If I drive straight ahead for several hundred feet before turning like at at traffic light before I turn, there is usually no problem. My guess is insufficient vacuum at times, but my test results do not indicate that. Suggestions appreciated and solutions would be great!!!
Thanks in advance!!!