Have a few questions about different things. (yes I searched)

[dr.gonzo]

The car is an 90 325I coupe.
First, When I start the car there is a high pitched how like a belt. The higher the revs the louder it gets. After a few revs it stops,

Second, I am leaking oil from the oil pan plug, when I tighten it, it begins to tighten then loosen, I will be attempting to use some teflon tape, any suggestions?

Third, I picked up some walmart pioneer 5.25in speakers and have a sony head unit coming in this week, will I need to replace the wiring and do I need an amp? I believe I have the premium sound system for whatever thats worth.

Fourth am pretty sure I have a bad wheel bearing, If I fixed the oil pan gasket how hard will this be?

Fifth and final, I have idiot lights telling me the rear lights are out, I already took the panels off and cleaned them. Any suggestions.

[whiltebeitel]

Oil Pan stuff:
Sounds like you have a stripped threads on the oil drain plug. Not good. Try a helicoil or replace the pan. To replace the pan (and, consequently, to do the pan gasket) you should unbolt the engine mounts, lift the engine up a few inches, undo the pan bolts, let the pan drop, then undo the 3 bolts to the oil pump, let it drop into the pan, clean all the mating surfaces VERY well, put the gasket on the pan (with the oil pump in there) lift it all up, bolt up the pump (make sure the little drive shaft is engaged) and fit the pan up. I think all the pan bolts need to be torqued to 7-8 ft-lbs.

Is the wheel bearing front or rear? Front is really easy, just need a torque wrench that can go up to 250 ft-lbs. Rear is a bit involved, you should search for a through explanation.

Try adjusting your belts to get rid of the squeak. It may just be some water on the belt.

[T Verdier]

Sell the car. ; )

[dr.gonzo]

Here is the wiring harness i found when i took out the oem head unit http://i40.photobucket.com/albums/e2...g?t=1259614605


suggestions?

[92 mtechnic cabrio]

you are fucked

[stumble_t]

get yourself a wiring diagram...

http://www.wedophones.com/BMWManualsLead.htm

[e30rapidic]

replace the belts - can spray WD40 on them to see if the squeal goes away. Diagnostic but not a fix

take the pan off and tap, you can use a bigger bolt from a mercedes benz. search should provide answers

can run wires to each speaker from the new head unit, instruction manual for HU will show you what wires to hook up

jack the car up and grab the top and bottom of tire and try to wiggle. If it moves, time to replace the bearing

try cleaning contacts where bulbs actually plug in, or check for loose bulbs

[dr.gonzo]

Anyone else got advice?

[stumble_t]

yea don't spray WD40 on your belts...
If you are tracking down a squeal use a squirt bottle with WATER in it

[dr.gonzo]

So I just took the old headunit out. In the process i found a couple of blown fuses and also that the fuse in the head unit itself was out. Now I can't find the hot or if I have found it there is no power.?

[dr.gonzo]

When I tried hooking up the new head unit to the amp It sounded alright in the lower volume but as i began to turn it up it became quite distorted until it cut out completely. I am guessing this is because the head unit is high enough powered to overload the amp?

[bataangpinoy]

find the oem amp and disconnet/bypass it completey.

[turbo zombie]

get yourself a wiring diagram...
http://www.wedophones.com/BMWManualsLead.htm

a little OT, but dude, thanks! i've been looking online for electrical manuals for e30s for a week!