1987 Jaguar XJ6 engine starves and dies

Tiny
87SOV
  • MEMBER
  • 1987 JAGUAR XJ6
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
I have a 87 Sov with square headlights. Never had a major prob for 20 years until now. While driving, it will suddenly start backfiring, turns off and stops. It works fine until this happens. It feels to me like for whatever reason, the engine suddenly starves of petroll. Air hoses, cooling hoses, fuel lines, electrical, and all connections had been checked, cleaned and replaced. What I have noticed is that just before the engine starts backfiring, I can hear some ticking sound coming from the glove compartment. These ticking sounds like wires are touching each other. But I amnot an electrician. Can anyone help. I would gladly donate soon as I can afford it.
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Wednesday, March 18th, 2009 AT 12:50 AM

4 Replies

Tiny
RASMATAZ
  • MEMBER
Check the fuel pressure fuel pump could be getting weak and producing low pressure. The clicking sound could be the fuel pump relay
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Wednesday, March 18th, 2009 AT 4:19 AM
Tiny
87SOV
  • MEMBER
Hi, thanks for the reply. I will test the fuel pump and let you know what I find. Thanks
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Wednesday, March 18th, 2009 AT 7:08 PM
Tiny
87SOV
  • MEMBER
Hi

sorry for taking a while to reply. The fuel pump is new. I test drove it and it run for about 30 min at 100 kph average before it started backfiring, then loss power then the engine died (no dashbord lights). I pulled over, turned off the key and re-started it but it kept backfiring. I waited about 30 min and restarted. It was fine again. I managed to get home (about 5 mins drive) and just as I was parking, it started backfiring again.

Thanks for your help
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Friday, March 27th, 2009 AT 12:41 AM
Tiny
RASMATAZ
  • MEMBER
Common Problems and Solutions for backfiring

Most causes of backfires in the exhaust system can be addressed by troubleshooting the reason for the air to fuel ratio imbalance. The solution usually involves checking for vacuum leaks, changing the airflow sensor, oxygen sensor, or fuel filter to ensure the fuel mixture system is functioning properly.

A common backfire situation occurs when there is a small leak in the air injection system that feeds the exhaust system. This can cause unburned fuel to explode suddenly. One of the most common causes is a stuck or faulty air intake or gulp valve near the exhaust manifold.

Backfiring can also occur with a sudden drop in fuel pressure. This may be due to a faulty fuel pump or a plugged fuel filter. Correcting problems in the fuel system usually resolves these issues.

Incorrect ignition timing to the spark plugs is another cause of backfire. Adjusting the ignition distributor, if the engine is so equipped, may resolve this problem. Adjusting engine timing is not difficult and can be done with a timing light by following the timing adjustment procedure for your car. If you do not know your car's ignition timing procedure please visit our car repair manual page. A vehicle that is not timed properly will not idle, run or operate correctly and will often backfire rapidly. On newer cars you will need to scan the pcm to check for CKS (crankshaft angle sensor) related trouble codes.

Maintenance

To prevent backfires there are several things you can do:

Change the fuel filter as needed, the fuel filter is a vital part of your fuel system and can cause a backfire(s) if the filter is clogged and not changed regularly. A bad fuel filter can cause low fuel pressure creating a perfect situation for a backfire to occur. Changing the filter is simple and can save gas with improved performance of your vehicle's engine reducing the occurrence of backfires.

Tune up and service your fuel injection system to follow the maintenance schedule for your particular car. This ensures correct fuel consumption with the correct amount of emissions. Fuel that is not burned completely will leave ample opportunity for a backfire to occur. These maintenance requirements are associated with other systems on your vehicle. Avoiding maintenance on your car can increase the risk of backfiring and other system malfunctions.
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Friday, March 27th, 2009 AT 11:26 AM

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