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  #1  
Old 04-21-2010, 07:44 PM
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Join Date: Mar 2009
Location: San Diego
Posts: 3,451
Question 300SDL missing at idle

One of the daily driver is missing at idle, the same one that need a pinion seal replace, tranny leak fix etc etc. The list goes on and on. Otherwise it is a good car. Anyway, it is missing at idle, not all the time. It seems to happen more often with a long idle, like stopping at traffic light for a while. The engine is warmed up already.

I am planning to change out the primary and secondary filters, check the hoses for air leak, and do a diesel purge. What else can I do or test to get to the root of the problem?

Any suggestions are appreciated.

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #2  
Old 04-21-2010, 09:20 PM
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Join Date: Nov 2004
Location: Nova Scotia, Canada.
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You could put a clear line into a container from the relief valve on the injection pump to make sure fuel is flowing out and no air first. That should indicate the fuel system or clear it.
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  #3  
Old 04-22-2010, 06:04 PM
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Join Date: Mar 2009
Location: San Diego
Posts: 3,451
Smoke coming from a pin hole on valve cover??

Did a diesel purge last night and it seems all is well. However, the missing idle happened again this morning. I stopped the car and lifted the hood and I saw smoke coming from a pin hole at the rear left hand corner of the valve cover, as shown in the picture. There seems to be a hole there but I am not sure it was there before or it was pierced by something inside the valve cover.

I closed the hood and drove back to the company and the idle was smooth again and car was purring like a cat. Lifted the hood and NO smoke coming from the pin hole. Should there be a pin hole on the valve cover? Where does the smoke coming from? Is it relate to the missing idle? Some stuck valves? I am puzzled.

The picture is not my car as I did not have my camera. I just pull a picture from the web for illustration purpose.
Attached Thumbnails
300SDL missing at idle-sdl_valve_cover1.jpg  

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

Last edited by ah-kay; 04-22-2010 at 06:05 PM. Reason: typo
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