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I can't find much on the description in the Jag Service manual (JTIS) on the Inertia Fuel Shutoff Switch (IFS)..Item #2)..but here is a picture showing a general location...From what I gather, that at a certain g-force decelleration (collision) this switch is tripped shutting off the fuel pump..I don't know if it can be reset once it has been tripped...Might want to poke around under the hood to see if you can find it..Wife has our Jag right now..so I can't go look and see myself if I could find it..
the switch is located on the passenger side front on the inside. Open the door and get down and look to your Right. it will be to the right of where the passenger would put his/her feet. Theres a plastic piece of trim that will look like it has a little plastic piece much like where the tow hooks are. Remove that piece of plastic and push the switch in.
05 Pontiac GTO 6.0L 6 Speed. L92 Heads, Lingefelter GT1-1 cam, Comp Cam Lifter Springs and retainers, 48lb/ Hour FAST injectors, L76 Intake, FAST 102MM Throttle Body, American Racing stainless longtubes, X-pipe, and Catted Mids into Corsa Sport stainless steel Cat-back. Conservative Dyno tuned to 420 RWHP and 401 RWTQ
99 Dodge Ram Sport. My 12mpg daily driver. 5" of lift and some 35" mickey thompson MTZ's. Very Typical. Superchips Programmer. Straight pipes. And a gutless 318 to power it all.
The switch was definitly tripped because I just went and pushed on it and it and clicked. Its still says the inertia switch status is tripped though. What I dont understand is if theswitch was tripped shouldnt thefuel be shut off? Could the switch being tripped cause my gas mileage to go down or cause the car to act like its going to stall at a red light sometimes?
I'm sure it's possible that the switch itself is faulty..I deal with components like this all the time in my line of work..
Maybe the electrical contacts that run the fuel pump never opened, that's why the car still ran..but the aux set of contacts that signal the computer that it is tripped are making intermittent contact or were the ones that set the notice off, threw the code, dropped the hint..whatever it does to the computer...
I was struggling for 30 minutes trying to start the car with exactly the same problem as described on this threat, before tonight my 93 XJ6 started every time, I turn the key. But after reading this forum,
Honest the God, I followed exactly the leads here, trying to find that Inertia Switch at the passenger side right foot area, I found nothing, except the fuse box, and I tried to push every single fuse inside (make sure they were not loss), all seems to be well, no clicking, no loss ends............
Frustrated for not able to find this Inertia Switch, I tried again anyway to start the car again.............it did...........cranked up as per normal.......running smooth again.
I shut the engine, restarted again successfully, running as smooth as usual...
ODD ! ODD ! Couldn't understand Jag's electric system.