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  #1  
Old 11-09-2009, 11:55 AM
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'97 E300 | Nailing/rattling while at speed

Question for you diesel veterans. Took my beloved diesel out for a trip this weekend, and all was well until just after the halfway point. While traveling down the freeway the engine would occasionally nail and rattle (marble like sound). This was at speed around 70mph. As soonas I hear the noise I would either decruease, or usually increase my speed and it would alleviate this noise, until I dropped back down into that "sweet" spot where it would make this noise.

I've been using teh Startron additive, as recommended on the label. I had initially filled the tank completely prior to the trip that day, and before halfway on that tank is when the noise started. I topped off the tank and the noise still persisted. The full flow filter was replaced recently, within the last 1,000 miles and the pre-filter also, after the car had been hibernating for some time.

When I got home after the trip I opended the fuel cap and there was come condensation on the cap. Soo.... I'm thinking that there is some water in the full flow filter, but I'm not an expert. I've never heard of our '99 have any such issues, it's only been my car that is so sensitive, if I can say that.

And no, I have not yet removed the injectors and had them serviced. It's on the agenda this winter, along with replacing some original rubber fuel lines, etc....

Any thoughts guys to what can cause this nailing while running, Mind you the car had been already driven about 170-180 miles prior to the onset of nailing.
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  #2  
Old 11-09-2009, 12:04 PM
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I'm not too familiar with the newer MB's but typically nailing is caused by tired injectors. Though it is unusual that it would do it after driving for so long. Nailing typically starts showing it's evil little head on a cold engine. If you can get it to do it consistently try cracking open each injector one at a time then rev the engine to make it nail. This will tell you which injector it nailing.
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Old 11-09-2009, 12:06 PM
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I'm thinking this was due to worn injectors... I've been battling this for a while, but was curious if it may have happened to be caused by something else, i.e. water in fuel...

I'll pull the injectors this winter.
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Old 11-09-2009, 06:14 PM
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What was the exterior temp like?

Is this the same car that had the algea issue a month ago?
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  #5  
Old 11-09-2009, 10:16 PM
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Quote:
Originally Posted by TMAllison View Post
What was the exterior temp like?

Is this the same car that had the algea issue a month ago?
It was in the 40's-50's. Same car. I "occasionally" have this nailing issue while driving, quiet rare actually. But yea, it's the same car. I'm trying to learn and understand why it would do this. But then again, the injectors have never been serviced during my ownership, but it's about time.
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Old 11-09-2009, 11:10 PM
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My inj's have never been serviced on either of mine FWIW. In my expirience, an inj with a bad spray pattern usually is almost normal at higher rpm's and worse at lower rpm's and/or when first started.

Is it possible when it nailed it was under heavier load/throttle input?

If so it could be sucking air, some moisture or have a slightly clogged filter.
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Old 11-09-2009, 11:20 PM
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Check everything the accessory drive belt turns.
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2007 ML 320 CDI
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Previous:
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1984 190D (Deerslayer) on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix to get a make over
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  #8  
Old 11-09-2009, 11:21 PM
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Quote:
Originally Posted by TMAllison View Post
My inj's have never been serviced on either of mine FWIW. In my expirience, an inj with a bad spray pattern usually is almost normal at higher rpm's and worse at lower rpm's and/or when first started.

Is it possible when it nailed it was under heavier load/throttle input?

If so it could be sucking air, some moisture or have a slightly clogged filter.
It was nailing under light/moderate throttle. A little worse if I got off of it for a moment then got back on. If I stayed in it, it was less likely, or at least shorter lived.
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Old 11-09-2009, 11:26 PM
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On a side note, the engine definitely nails when cold. The colder it is, the louder and longer it nails until it warms up. Been like that since I bought it. Usually a higher dosage of fuel additive, i.e. Redline Diesel Catalyst would greatly help the cold nailing.
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  #10  
Old 11-10-2009, 10:16 AM
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I have the same issue while at speed with very light throttle. I think its an EGR issue. It sounds like pinging in a gas engine. I havent taken the egr apart yet to see if its not closing all the way, although I would think it would through a CEL. I have now sprung a fuel leak so thats the top priority.
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  #11  
Old 11-10-2009, 10:46 AM
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Quote:
Originally Posted by e300D97 View Post
I have the same issue while at speed with very light throttle. I think its an EGR issue. It sounds like pinging in a gas engine. I havent taken the egr apart yet to see if its not closing all the way, although I would think it would through a CEL. I have now sprung a fuel leak so thats the top priority.
My EGR is currently "fooled". Has been for a long time now, so that's a none issue.
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Old 11-10-2009, 08:19 PM
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Had the same problem with my 93 w124 300D.. I changed my delivery valves even though they weren't leaking and that cured the "marble rattling" nailing above idle. It also made my idle much smoother! The old orings were flattened and brittle and the copper washers were really discolored. Worth a try??
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  #13  
Old 11-13-2009, 08:53 AM
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Quote:
Originally Posted by greenlogic View Post
Had the same problem with my 93 w124 300D.. I changed my delivery valves even though they weren't leaking and that cured the "marble rattling" nailing above idle. It also made my idle much smoother! The old orings were flattened and brittle and the copper washers were really discolored. Worth a try??
I just had mine replaced in my 97 E300D as well. For a couple of days aftern I had the nailing at idle, but the nailing at speed is now gone.


****UPDATE***** At speed nailing is still gone. Drove about 800 miles this weekend and quiet as a mouse. The nailing I used to get at upshifts just before the drop in RPMS is gone also.
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Last edited by e300D97; 11-18-2009 at 09:34 AM.
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