I hope someone can help me. I have had this 95 Disco for many years, every thing was great until this past June when I had a variety of things happen. 1. it overheated, I checked the cooling system and it was fine then, but I found out that my cats went bad. I had just put a new exhaust on it. So I replaced the cats but the gas mileage was terrible. My mechanic thought that when the cats went bad that they filled the muffler with debris. He suggested a low back presure system. So I put a Borla on. Then I replaced the air filter box with a more efficient K&N cone style system. In December I noticed that my waterpump was leaking. So I checked to see how much wabble was in the shaft, I replaced that in January along with all the hoses and belt as well as the Radiator. I was then told to clean the throttle plate so and air flow meter, I found that CRC made one for the throttle plate and the air flow meter and did it according tothe directions on the can. Now I also have a check engine light (fault code 12) So what am I supposed to do? By the way the people at land rover have not been much help.

I have great compression. it has 150K on it and my exhaust pipe is blacker then black (looks real rich to me)

????

 

Check the coolant temp sensor---p/n ETC 8496(Fault code PO117,118, and 121), and the air temp sensor Fault code PO112,113, and 116). If these fail, the computer maintains too rich of a fuel mixture even when the engine is warm. And this will kill your gas mileage.

regards,
Geoman
www.eurotekapg.com

 

I'd probably go back to a paper air filter as the oil and such from the K&N messes up your air intake sensors. I don't know what fault code twelve is. What is it?

 

Thanks for the reply but it is a 95 disco so it uses the 2 digit trouble codes under the passenger seat. 12 is the Mass Air Flow sensor. The paper filter with the old "Box" actually gave me much worse mileage. When I cleaned the throttle plate you would not believe how dirty it was. Thats why I cleaned the MAF as well. The mileage does seam to have improved since then (at least I'm not watching the fuel guage go done as quick)

Does any one know how to clear the code?

 

I think it was Disco Mike that said he went through two MAF sensors very quickly using K&N filters. The oil in the filter messes up the sensor. It looks to me like its time to replace the MAF sensor. Has it ever been replaced to your knowledge?

 

I have had this disco for about 100k of the 150k and I have never changed it. I used to work with sensetive filtered machines and used a similar filter so when I clean and oil it I use compressed air to distribute a small amout of oil through out the filter, then use a blotting agent to remove any excess. I do believe that the oil could do it. But I used the K&N for all 100K of my ownership. I reverse clean my filter once a month with compressed air 60psi to keep the filter clean. I did change from the Land Rover air box to a Cone style filter when the mileage dropped below 8mpg though. That brought up the mileage/gallon back up to about 10 or 11. How do you test the mass air flow sensor?

 

Well the best way to test it is to using a scan tool. Very expensive. It may benefit you to take it to a shop so they canread it's input\output readings and confirm failure. If it was me and at that mileage, despite it's cost, I would just replace it anyway. Best of luck and let us know.