baddawg
Member
- Joined
- September 8, 2005
- Messages
- 14
- Reaction score
- 0
- City, State
- Ottawa, Ontario
- Year, Model & Trim Level
- 1991 Explorer XL 2WD
My explorer is now undrivable. I used the MAF cleaning link on this site and it made no difference. The vehicle is litterally getting 3miles to the gallon...1/4 tank to go 15 miles. Below is the info from the thread I started in the 91-94 stock forum. As the diagnostic at FORD said the MAF and O2 sensors are reading I am officially stumped. There is lots of pressure in the fuel rail....maybe too much? Is there a regulator in the fuel line that if fails (intermittently) and just pumps the fuel to the cylinders?
I recently bought this 91 explorer as a "post divorce/she got everything/I'm broke vehicle. The body is a little rought but mechanically it is in great shape. Here is the problem.
The fuel is burning rich. Quite irradically it can suddenly burn supper rich with a drop in horse power. I didn't want to start guessing sensors but strongly suspect the MAF. I gave up and took it into a FORD dealer as it needs to pass the emissions test here before plating the vehicle. It failed miserably. They worked on it for 3 hours telling me that there were vacuum leaks (that I didn't find), changed the oil twice (to get the gas out of the oil), gapped the new plugs (that I somehow didn't do right). Their extended emission test found the MAF and O2 among others working fine. What ever they did it then passed the emissions test with flying colors. Yeah....... not so quick!!
It in under 25 miles since servicing started getting rich again right up to being as bad as before with people chocking in my rear view mirror. I have noticed that it usually gets bad when running and higher rpms for a few minutes. If I back the rpms off for a while it starts to run better and the HP returns. Drive it harder and it eventually goes back to killing the local insect population. The clean oil now smells of gasoline again.
I called the previous owner up. He tells me that when it runs rough he used to stop, shut it off, and tap the MAF and it would run better. For the most part he is right.
Here is my question..... Keep in mind that the FORD dealer managed to get some pretty clean numbers only 25 miles previously.
Has anybody heard of a MAF that intermittantly malfunctions?