I recently acquired a 1983 mark 3 jaguar xj6 4.2, it has recently gotten brand new spark plugs and a distributor. The first thing I did was remove both tanks and send them in to get a resin coating to stop rust. I also added in 2 low pressure filters before the change over switch each side, I tested the fuel pump and it had very low pressure, so I lived with it for about 2 months. I had black soot mixed with water coming out of the exhaust at idle, and sometimes itll smoke badly when accelerating. It kept cutting out in traffic and I had to quickly put it in park and start it with no issue. It also lacked power when in low rpm, and sometimes I would start it and it would start and idle perfectly, then sometimes it would crank for a while and have a rough idle. I found it would run better after driving it for about 30 minutes. So today I decided to get the knew pump and put it on. But now the issues have gotten much much worse. I also took off some of the wires for the injectors to put in new hoses. But now it was a problem to start, and it will not keep running unless I accelerate. It runs so terribly, I took it for a test run and as I put my foot down it wants to cut out. The engine shakes a lot when I idle it.

 

It also has 130k miles

 

Another problem which I don't know if it's related, is that the speedometer is out by 10-20km/h and the battery sometimes doesn't go up to 13v.

Please can someone help, its pretty much the only car I have available and I want to go to a show with it on friday.

 

Hi Travis,

you would get more help if you post your problem into the correct forum.

This is the forum for the X350, built from 2003 to 2009.

Best regards,

Thomas

 

Oh sorry thank you