Just bought this car used an obd2 got a code of P0102 which is mass air flow replaced mass air flow getting same code with a reading of low input car will run but idles very rough and idles at 600rpms looked in the owners manuel for a possible fuse that I could check nothing in the book looked at the plug to see if there was any in line fuses couldn't see anything on that any suggestions please

 

the JTIS says its either the MAFS (electrical) or a clogged air filter.

You could try cleaning the MAFS, there's a link to doing so in the FAQ thread for the XK8/R models. Its very easy.

 

Tried to clean the old Maf got a new maf and it's a new air filter same thing also tried to erase the code it still runs rough and after running for awhile I get the same code no service engine light though

 

Are there any other codes, or just the P0102?

What about the harness connecting to the MAFS, can you check the pins...clean them with electrical contact cleaner maybe?

 

no other codes havn't tried the cleaner. If you unplug the maf there is no difference in the way the car runs

 

Do you know if there is an inline fuse?

 

I don't think so. I'm not an expert on the MAFS, but if I unplugged mine, it would seriously affect idle...check the pins and wiring from the MAFS back. Did you also look for leaks just downstream of the MAFS?

 

The mechanic that I took it to said that the MAF has been the death of many Jaguars. I am really thinking that I bought a huge problem. The mechanic said that he is hearing a knock in the engine. Suggested taking it home taking the belt off and starting it up to eliminate any accessories causing the knock. Then go from there. Says the MAF could have caused the car to run hot. Very worried that this is going to turn into buying another engine