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1986 Jaguar XJ6 stalls

Tiny
VBRAGG
  • MEMBER
  • 1986 JAGUAR XJ6
1986 Jaguar XJ6 6 cyl Two Wheel Drive Automatic

Car barely idles and stalls when excellorated. Some times won't even idle. I changed the fuel pump and filter. Plenty of gas at the pump. No power at the + side of pump. I changed the fuel pump relay located on the firewall. Still no power at the pump. My manuel talks about an Inertia fuel cut-off switch. Could this cause my problems. Local stores don't carry this part. I'll order if this will work. Any ideas?
Thanks, vern
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Thursday, April 30th, 2009 AT 5:35 AM

34 Replies

Tiny
DAVE H
  • MECHANIC
  • 13,384 POSTS
Hello .. thanks for the donation .. much appreciated

ELECTRIC FUEL PUMP
The electric fuel pump provides fuel under pressure to the fuel pressure regulator. Power for operation during cranking mode is provided from starter relay via the diode unit. After the engine has started, control of the fuel pump is by a fuel pump circuit in the airflow meter.
The first movement of airflow meter air measuring flap (about 5 °) closes the fuel pump contacts and provides power to fuel pump after engine has started. With engine stopped, no airflow is present, measuring flap closes and fuel pump contacts are opened to cut power to fuel pump. This method of circuitry reduces the risk of fire in a collision. The fuel pump is a sealed unit; no service required.

Fuel Cut-Off Switch...At right door pillar. See Fig. 19 .


https://www.2carpros.com/forum/automotive_pictures/266999_inert_1.jpg



hope this helps


https://www.2carpros.com/forum/automotive_pictures/266999_AAA2_624.png

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Thursday, April 30th, 2009 AT 5:49 AM
Tiny
RASMATAZ
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The inertia fuel cut off switch is located on right door pillar

At the fuel pump relay socket check for power at the white wire if nothing there unplug the inertia switch and jumper it if white wire has power now on the fuel pump relay socket replace the inertia switch

If there's no power going into the inertia switch you have an open circuit from there to the ignition switch.


https://www.2carpros.com/forum/automotive_pictures/12900_fuel_cut_off_switch_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_inertia_switch_4.jpg

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Thursday, April 30th, 2009 AT 6:04 AM
Tiny
VBRAGG
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I can't locate the Inertia switch. I don't see anything that looks like the picture. My car is a series 3. Once I locate the switch can I bypass it?
Thanks, Vern
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Friday, May 1st, 2009 AT 6:34 AM
Tiny
VBRAGG
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  • 19 POSTS
I found the switch. It is located on the pass. Side pillar post (interior) next to the fascia panel. Easy to miss. Can I bypass? The part is $100 and I would have to order it. I have a rquest online for a used part, nothing yet. I hope this is my problem.
Thanks, Vern
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Friday, May 1st, 2009 AT 7:01 AM
Tiny
RASMATAZ
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Yes you can bypass it
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Friday, May 1st, 2009 AT 11:05 AM
Tiny
VBRAGG
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I jumped the inercia relay. No change. Starts, runs very rough, can't accelerate and stalls. Back to basics. Any ideas? My wife pulled it into the garage with no problem. The next day she went to start it and wow. What could have happened?
Thanks, Vern
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Friday, May 1st, 2009 AT 4:31 PM
Tiny
RASMATAZ
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Do you hear the fuel pump when key at run if so check the fuel pressure and get back with it
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Friday, May 1st, 2009 AT 5:25 PM
Tiny
VBRAGG
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  • 19 POSTS
The pump is not running with the key on run. I may have changed the wrong relay for the fuel pump. There are 2 relays on the fire wall. I changed al 3 relays on the firewall(used) with no change. The fuel pump is not coming on.
Thanks for your patience, Vern
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Saturday, May 2nd, 2009 AT 5:10 AM
Tiny
RASMATAZ
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Power the white and orange wire at the fuel pump connector from the battery-Did the fuel pump come on-If not its defective.
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Wednesday, May 6th, 2009 AT 3:44 PM
Tiny
VBRAGG
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  • 19 POSTS
Powered up the pump. It runs when powered. Tried to start the car while fuel pump was runiining. No change. No power at the fuel pump relay. (White&yellow wire) Ignition switch maybe?
Thanks, Vern
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Wednesday, May 6th, 2009 AT 4:05 PM
Tiny
RASMATAZ
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I jumped the inercia relay. No change. Starts, runs very rough, can't accelerate and stalls. Back to basics. Any ideas? My wife pulled it into the garage with no problem. The next day she went to start it and wow

It fires up when it hit the sweet spot Sounds like the ignition switch is failing
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Wednesday, May 6th, 2009 AT 4:18 PM
Tiny
VBRAGG
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  • 19 POSTS
Can I confirm this to be the problem? I already have changed the fuel pump, fuel filter, 2 relays and the inertia switch. I'm tired of going fishing.
Thanks Vern
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Wednesday, May 6th, 2009 AT 4:24 PM
Tiny
RASMATAZ
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Okay I want you to power up the inertia switch the way you did the fuel pump at the white wire both side of the inertia switch make sure the ignition switch is off.
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Wednesday, May 6th, 2009 AT 4:33 PM
Tiny
VBRAGG
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Powered up inertia switch. Nothing happened. Could hear clicking sound from relays
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Wednesday, May 6th, 2009 AT 5:01 PM
Tiny
RASMATAZ
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Leave the jumper wire at the inertia switch

At the fuel pump relay socket check for power at the white wire and also at the white and orange wire do you have power
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Wednesday, May 6th, 2009 AT 5:07 PM
Tiny
VBRAGG
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No power at either.
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Wednesday, May 6th, 2009 AT 5:26 PM
Tiny
RASMATAZ
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Do a continuity test from the white wire on the fuel pump relay socket to the inertia switch
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Wednesday, May 6th, 2009 AT 5:29 PM
Tiny
VBRAGG
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I'm showing 13
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Wednesday, May 6th, 2009 AT 5:40 PM
Tiny
RASMATAZ
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Is it ohms or volts?
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Wednesday, May 6th, 2009 AT 6:05 PM
Tiny
RASMATAZ
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When you tun key to run you should have power on both side of the inertia switch if its not tripped. No power at all it points back to the ignition switch
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Wednesday, May 6th, 2009 AT 6:10 PM

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