Ae-92 Interference Whistle.....

[Unity Jon]

In the past a few people have asked how to stop the 'whistle' you get in ae92's when you fit an aftermarket head unit, i've yet to pull apart a stock head unit to see the stock suppressor, but it must be a pretty good one......

In the past i cured my 'whistle' with a simple bodge, i took a piece of tin foil and wrapped it around the car wiring loom that sits behind the stereo and comes from the engine bay i then pushed a screw through the foil and into the firewall to earth the foil, this works pretty well but is a real bodge.

just recently i fitted a new mp3/wma headunit B) and though i'd take the foil away....big mistake, its whisltling really loud now.....

instead of refitting the foil i though i'd try out the proper solutions... i went and bought a big ***** suppressor and fitted it into the power feed to the stereo...guess what... no %$(ing difference, so i pulled the aerial lead out of the head unit as this can sometimes be the source of interference but it made no difference, so i dug out the wiring diagram for the car and stared for a while......

the noise changes as you accelerate which narrows it down to either tacho or speedo right ? the speedo is cabel operated so it cant be that so i looked at the tacho. In the drivers side foot well there is a fuse (no. 13) for 'guages' and if you remove it all the guages are killed, so i did, with no tacho there was still the !Removed! whistling noise.

i was getting a bit disheartened by now and for a laugh i removed the fuse (no.6) labelled 'engine' to see what would happen....

i though it may kill the car altogether, but it didn't, only the whistle stopped !!!!???? i couldn't believe it and was a little weary, what did this fuse/circuit do ? after re-checking the diagrams it turns out this fuse is for the 'charge circuit' and provides feed to the little 'battery' light and also the Volt meter, now i could leave it out all the time and hope i never have any charging issues, but thats not me so I will remove my suppressor from the stereo input and wire it into the charge circuit (large yellow wire from alternator) to see how this goes as soon as i get some time.

!Removed! thing.

[toymota16v]

if it speeds up and slows down with engine speed it could be the coil circuitary or the charging circuit from the alternator

not had any problems with mine since i supressed the coil

[Unity Jon]

well i wired the suppressor into the yellow wire from the alternator and it made no difference

will try the coil tonight then, if that fails, i'll try replceing one of the dodgy looking cheap rca leads i have and if that fails its back to earthing the foil round the wires :o

[dosenöffner]

You may need a better (new) supressor.

Re-terminate all the earths also just to be sure.