[mcnm99]

Recently hit a rock on the roadway which bumped around under my 1990 LX Mustang. The car quit on me immediately after this. I have
checked the inertia switch in the cargo area which is reset and fine. I have power to the inertia switch but the fuel pump will not prime or run
when I turn the ignition switch on. I have ran a jumper direct to the fuel pump and it will run this way so I beleive that the fuel pump is fine. Also I have no spark to the spark plugs. The coil and the module have power to them but have no spark to the plugs. Is there some advise you can give?? Maybe some safety feature which would disable both the fuel pump and the ignition system upon a collision ??

any advise would be appreciated !!!
MCNM99

[sleeper_inc]

Check for loose connections, cut wires, and also make sure that nothing has broken

[b&wmustangs]

sleeper's got a point it sounds to me like a broke wire.as far as your firing issues most fuel injected cars will not fire if the fuel pump isn't running and vice versa.they're made like this so if it quits firing you want flood the engine with gas.lift the car on jack stands and look under it you should be able to see where the rock hit if it was that big.

[mcnm99]

I have it jacked up and have inspected the undercarriage. I cannot find any damage other than a dent in the transmission pan. I bought a
code reader yesterday but the car will not give me any codes. I tested the code reader on a 1989 Ford F250 pickup and did get the code 11. So i know that the code reader works. any idea's

MCNM99

[sleeper_inc]

Have you double checked the inertia switch?

[mcnm99]

Yes - I disconnected and removed the inertia switch. I checked it in
both the tripped and reset positions for continuity, found that it has no continuity when it is tripped and has contunuity when reset. I beleive this is the way it should work. I then replaced it. I plan to remove the
ignition coil and ignition module tonight to have them tested.

[davido30093]

Check the fuel pump relay (Under the driver's seat).