!994 Park Avenue FM radio reception poor. AM signal OK

As suggested it could be underhood electrical interference. If the "static" changes with increased rpms (rev the motor to find out) chances are it is ignition related and could be literally everything from the alternator to the ignition coil through the distributor cap, but best bet is the spark plug wires (which if still original really should be replaced anyway) or the plugs themselves. If your am static doesn't change with engine revolutions and your fm works okay I would check antenna and the antenna connections at the base of antenna and back of radio. if you cant even get a clear signal on the most powerful AM station in your area, I would bet on some kind of break in the connection between radio and antenna. p.s. if you;ve anything plugged into cigarette lighter or other 12volt outlets in the vehicle unplug them before doing any of the rest!

static sound on AM band can be reduced by the adding of a capacitor to the alternator terminal. Check the coax cable especially the outside braid is connected to the body for earth

I had the same exact problem. Toyota changed the Amolifier that improved sound quality but not the FM Reception.

THE HARNESSES CONNECTING ANTENNA TO RECEIVER (TWO OF THEM) HAD IAASUES. REPACING THEM FIXD THE ISSUE. FM RECEPTION EXCELLENT NOW !!!!!!!

This can happen for three reasons:

Do you have tinted windows? The AM radio signal travels further than FM due to being a lower frequency; however, its transmissioncan can easily be interfered. Tinted windows affect the AM signal's transmission to your car and not FM which is at a much faster frequency. Once I tinted my windows, the AM interference went way up when I accelerated and braked. I only listen to my FM channels now due to this annoying interference.

You may have electrical interference in your car causing this as well. Does it happen when rolling down the windows as well?

Third, it could be distance, the AM's transmission tower can be far away and you might be barely in range whereas the FM's transmission tower may be closer.

When you have a problem with these, it is almost always best to just get a good used one. You can find a ton of them on ebay, or your local wrecking yard. They are easy to take out and put back in as long as no one has messed with it in the past.

check antenna cable connections at radio & antenna.suspect power antenna if equipped.

Check the antenna connection where it connects to the stereo it may be loose or not in all the way.

two types of noise accur on radio's first is known as a whine,, goes up and down with engine rpm secound is static...normally static is from bad plug wire or plug... you probably have coil packs.. one of them could be arcing.. check it out in the dark of night and look for the spark light. most time good tune up fixes let me know

it might be that your gadget posses a wrong panel written AM when there is no am tuner. If you can check inside it whether it has a choke wound with copper wire for AM reception. If its missing, its aint gonna have any reception

if you are receiving stations on the higher frequencies then your radio is the problem and not your antenna or anything else