1990 Jaguar xj6 4.0 problems

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Apr 15, 2009 | 03:33 PM

chopperchip

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1990 Jaguar xj6 4.0 problems

Have a 1990 xkj6 with a 4.0 in our shop. came in as a no start. had to repair harness to crank positioning sensor and replace sensor. alsop had to replace ecm. now, the car will pop with starting fluid. have fuel pressure. just found that the fuel pump relay stays in constant hot. car will still not start. also has a short in the speed warning module i found while i was under the dash...... any ideas on what next? thanks

Chip in Naples,Fl

Apr 15, 2009 | 04:08 PM

JagtechOhio

Joined: Mar 2008

Posts: 2,521

Likes: 71

From: Powell, Ohio U.S.A. 43065

You're the only guy who can fix that one. it sounds like one of those troubleshooting test cars for tech school kids.

ECU failure on XJ40 is extremely rare. The fuel pump relay staying energized after two seconds to prime is WRONG. Work from there back through the diagram, you are not describing a scenario that is at all common.

Feb 21, 2010 | 10:01 PM

cancer63

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Joined: Feb 2010

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i have been hearing noise at the rear of my 1990 jaguar xj6.have removed the driveaxle,the inner driveaxle u joint,and the bolts from the output shaft housing but i can not detatch the output shaft housing from the differential.do i need a special tool to do thi.