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Help with 99 Ford Explorer

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New User

Jan 12, 2010, 7:57 AM

Post #1 of 5 (2004 views)
Help with 99 Ford Explorer Sign In

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.

Mileage is 143K, engine is a V6

Thanks for you help in advance.



Jan 12, 2010, 3:41 PM

Post #2 of 5 (1992 views)
Re: Help with 99 Ford Explorer Sign In

that sounds like trying to find a needle in a hay stack :)
it could be a number of things do have the engine light on?

Veteran / Moderator
way2old profile image

Jan 12, 2010, 5:15 PM

Post #3 of 5 (1985 views)
Re: Help with 99 Ford Explorer Sign In

Since you can make the problem occur, have your mechanic ride with you and show him what is happening. A lot of times that is all it takes for him to understyand what the problem is.

Being way2old is why I need help from younger minds

New User

Jan 13, 2010, 5:55 AM

Post #4 of 5 (1976 views)
Re: Help with 99 Ford Explorer Sign In

Brager - I do have an engine light. The mechanics run the computer a few times and come up with some dirty sensors, which he says he's cleaned. It was off last night when I picked it up but turned on again this morning on my way in to work.

I have a hard time believing my mechanic is taking my truck for a spin for any amount of time. Driving it from the shop to my place of work - about 4-5 blocks, I experienced some issues as well as going to and from work over the last 24 hours. I've decided I don't think my mechanics heart is in it and I may take it to another place next week to have it looked at.

I did some research on the web and found something that might be the source of my issue. 99 Ford Explorers experience similar issue with a bad mass airflow sensor. Sounds like it would run less than 150$ to have it replaced so I may request they check that.

Veteran / Moderator
Sidom profile image

Jan 13, 2010, 10:12 PM

Post #5 of 5 (1968 views)
Re: Help with 99 Ford Explorer Sign In

Not a whole lot of info to go off of here but if you were getting a P0171 & P0174, lean bank 1 & lean bank 2, I would definitely be looking at the MAF sensor real close. You can try tapping on it with the handle of a screw driver while it's running, if you get any fluctuation in the idle at all, I would replace the sensor.

Did your tech take a fuel pressure reading @ idle & high speed?

(This post was edited by Sidom on Jan 13, 2010, 10:12 PM)

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