The m104 in my car is making a weird noise. I havent had the time to sit there and play with the belt and tensioner to make sure its working properly.

The noise sounds like if you took a latex balloon and rubbed your hand just in a rotational manner... example "squer squer squer" thats what I hear. It doesn't increase as much with the revs which probably means its something pulley related and its coming from the front. Can't point to exactly where.

The electronic throttle body makes a noise like that if you turn the ignition on but don't start the car. Can't say I've every heard it with the engine running, though. Of course, it doesn't come from the front of the engine either...

Could be one of the pulleys going out: idler arm bearing, water pump bearing, air pump bearing.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

huzah.... well I guess I'll have to somehow check the pulleys. I love my life. so much

Ok its making the sound but I was at a stop sign and it stopped.

How often does the air pump cycle?

man.... i think you have a bad pulley somewhere..........

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

Only at cold start up for about the first 30 seconds or so until the cat warms up. It's only purpose is to lower smog emissions at start up.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

ok, I know the air pump sounds a bit loud and yeah... my check engine light is on due to a think a faulty MAF. I havent had the money to replace that thing.

What about the bearing for a pulley

A dry belt can cause a noise like you describe. With the engine running you can spray a little silicone spray on the belt (both sides) and if it goes away you've found the culprit. If the silicone spray quiets the noise then you get the peace of mind knowing it's not a bearing going out. You'll have to plan for a belt eventually as the silicone is just a temporary fix.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff