Does anybody know what the length of belt I would need without the air pump installed?

I searched previous posts but can't find a thing for this engine. I might try using string to get a rough estimate.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

If you find out, buy two. Then I will buy the spare of you.

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K

belt

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Thanks. Let you guy know how it turns out.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

You may or may not be aware, but if you do not run your airpump, your check engine light will illuminate, and fault code(s) will be stored.

I don't think you'll be able to pass smog without it.....

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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".

I'm going to trick the computer into thinking it's there. Since the pump doesn't have anything to do with normal emissions the only part that I'll have to worry about is the visual.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

But it has everything to do with emissions.

It runs when the car is cold. The engine is running rich, so the air pump pumps air into the exhaust to dilute emissions.

The newer M112 and M113 V6's and V8's with a SOHC and 3 valves per cylinder (one intake valve and two exhaust valves) allow the engine to run cleaner, especially when the car is cold, so air pumps are no longer needed.

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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".

What I meant was, when I bring the car into get tested the engine will already be hot so the pump won't be used.

I was just looking at an M119 drive belt diagram and if I do remove it I will need a get a idler pulley in its place. So depending on the cost of that part I might just get a replacement pump. So far I've found one at $225.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

Smog tests require that the tester confirm that all parts are in working order. He can fail you on just the visual inspection.

You cannot pass smog with a tripped check engine light, either. Without the air pump hooked up, it will be tripped. Further, even if you clear the code(s) related to the check engine light, the DM still stores other codes.

Last, the air pump runs whenever the ECM decides it is necessary, which is also sometimes at idle, even when warm.

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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".

Of all the times that I've smog cars I don't remember when I've seen the tech compare the engine compartment to a picture or really even give it a good look. The only instance that I can recall a car not passing the visual on a smog test was on my friends Porsche 944 that he bought for $250. At that price you can imagine the state it was in.

I'm going to try to trick the computer by completing the circut with something else.

When would that happen? It's never done that on my car.


I can tell your against the idea of getting rid of the pump. Since I can get it for so cheap I might just buy a replacement. It just seems that this part isn't very necessary, how much can the emissions differ in the first two minutes of start up whithout it, I don't think much!?

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

If you'd like to try going without running your air pump, it's pretty harmless.

I don't know how much smog emissions changes with the pump running. Probably not much, but enough to make a difference to fail smog emissions.

I'm not an expert, but I think it does more than what we're aware of.

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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".