New here, first "techie" post . . .
A question on behalf of my Dad who has been running my old XJ for the last couple of years, we've never had any major issues with the XJ, replaced the pushrods, put harder springs on the rear and all was going well, until an annoying problem has developed: -
The XJ runs fine for a period of time, either on the drive or out on the road, then all gauges and dash lights drop out, the voltmeter drops to 12v and the engine begins to knock. Diesel is getting through but with no engine management to control it. Immediately turn engine off. We then have to sit turning ignition on/off repeatedly until everything comes back and the engine can be turned back over.
Dad has gone through everything he can think of (he is a retired AA Patrol and mechanic) and is pulling what little hair he has left out!
If anybody has any ideas/advice it would be very welcome!!