The horn relay on a 1990 Crown Vic is located in a black plastic box that is under the hood, just behind the battery, the lid is held on by simple clips that come off easily. You should see a chart under the plastic lid of this box that will tell you just which relay is the horn relay.
Yes
It might be that your main fuse is blown or a bad ground. Can't think of anything else it could be.
5x114.3
yes they will
hydraulic roller cam.
No you do not have to lift it up they will fit.
right next to the engine
The EFI relay is located under the dash on a 1990 Honda. It is on the driver's side, under the steering column.
Its on the registration. Its around 3,600 lbs.
Have to remove the oil pan. It's in there.
According to one of Fords websites : For a 1990 LTD Crown Victoria police interceptor with the 5.8 liter / 351 V8 : The spark plugs are gapped at ( .044 inch )
I have a 90 crown vic. Send me a email address. Mine is irishone_oneirish@yahoo.com