Smooth running values and chassis numbers

Tanner Instructor South Carolina Posted   Latest  

As many of you know I do not work on Euro vehicles if I can help it. I just have never had the training on them or the car count to make it worth my while. 

For those of us that do not work on euro cars can someone explain how to use smooth running values effectively? 

Also is there a way to easily find the chassis numbers?

thank you for the help!

Tanner

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Aaron Owner/Technician
Maine
Aaron Default
 

What Brand are you having a hard time finding Chassis numbers for? BMW, Mercedes, VW/Audi?

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Tanner Instructor
South Carolina
Tanner Default
 

Hi Aaron, thank you for replying. For me it’s normally Mercedes and the earlier ones seem to be hardest for me. I can use my launch and enter the vin and get them that way normally though. I was trying to be general across the board as I know this is something a lot of us struggle with that don’t work on euro cars as often.

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Aaron Owner/Technician
Maine
Aaron Default
 

Tanner here is a list for most Mercedes using the 4th,5th,6th & 7th digit of the VIN lmvindmercedes​.​net/Model_Indicato…​.​pdf. There are a couple of other styles on Mercedes website as well. startekinfo​.​com/StarTek/outsid… startekinfo​.​com/StarTek/outsid…

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Steven Mechanic
Washington
Steven Default
 

The most accurate way for me is to enter the VIN into whichever VIN decoder you like. Alldata does a really good job when you enter the VIN. It will show the chassis number and engine number in the vehicle description. Of course, the factory scan tools will show this as well when you enter the VIN. I'm sure there are other ways, but I usually need to enter the VIN in Alldata or the scan tool

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Steven Mechanic
Washington
Steven Default
 

If you need deeper decoding to find vehicle option codes and such, there are some free BMW and Mercedes decoder websites that I will provide links to. I've used them a few times and they work very well for this, but as with any website, use at your own risk. I assume they are safe since I've used them without problems before. Mercedes deep decoder BMW deep decoder

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Charlie Curriculum Developer
California
Charlie Default
 

Hey Tanner, Here's a decent up-to-date list bimmerworld​.​com/About-Us/BMW-C… Smooth running measures and compares cylinder rotational speed. With smooth, i.e., uniform combustion, you are looking for values at or near zero. It's a great diagnostic tool, but you are on your own after you find the problem cylinder(s), unless of course you have misfire or other related DTCs. It's

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Charlie Curriculum Developer
California
Charlie Default
 

Tanner - assumed BMW, my bad.

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Tanner Instructor
South Carolina
Tanner Default
 

Thank you Mr Burke! BMW data is fine, I thought this would be a good topic for all to learn from since Euro manufacturers use this instead of cylinder misfire counters. Any input for any manufacturer is good info!

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Chris Diagnostician
New York
Chris Default
 

You can use the operational smoothness to locate an issue that is affecting a cylinder, but not bad enough for it to cause a light. It's a nice feature to use.

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Steven Mechanic
Washington
Steven Default
 

The best way to use smooth running values or true running values for diagnosis is to graph the data, and also to set the scale for the graphs so that they are all at the same scale. The snap on scan tool is great for graphing these, but as you know, snap on automatically scales the graphs which isn't good for this test because you are trying to find a very slight rough idle usually, and the

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Tanner Instructor
South Carolina
Tanner Default
 

That’s a great way to look at them, makes it easy to see. Thank you for the advice!

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Jeff Manager
Missouri
Jeff Default
 

Tanner, If you use Alldata they give you the Chassis number on BMW and Mercedes when you enter the vehicle info in at the top of the page. There is also real OEM which will give you the info for BMW with the last 7 digits of the VIN. There are other decoders through the factory sites if you need more detailed info but these are quick and free if you already use alldata.

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