Engine Performance problem
1999 Ford Explorer 6 cyl Four Wheel Drive Automatic 149000 miles
I've taken my vehicle to a mechanic 3 seperate times and he has no idea what the issue is. He says he can't duplicate it but for me it happens just about everytime I drive it. Here is the breakdown I gave him:
- When maintaining speeds of 35mph and 55mph, RPM's drop down from 2000-2500 to below 2000 and I can't get any pickup or gain any speed. I can take my foot off the gas and then press it again and sometimes that fixes the issue.
- When this happens I can maintain speed but cannot accelerate.
- Occasionally while idling the RPM's drop down repeatedly. It idles at around 1100-1200 normally, but drops down to about 500-800 repeatedly about every few seconds.
- Occasionally while driving at high speeds 55+ there is a loud "clunk". This is typically when roads are in a bad condition. We have confirmed 4 wheel drive is not working and I suspect this may be related.
I bought the truck in August and since then it's gradually got worse. It seems to occur more frequently when the engine has warmed up a little.
Thanks for you help in advance.
have the same problem?
Tuesday, January 12th, 2010 AT 8:54 AM