Help with Idling and power - Mercedes-Benz Forum

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post #1 of 6 (permalink) Old 03-14-2011, 09:24 AM Thread Starter
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Help with Idling and power

Hey guys,

first post--I have a 2000 e320 four door sedan and I had probably driven it too long(6months or so) needing to get the Cat converters changed. They were so expensive but I finally got them done this past week--$1900.00(there is for the four(2 on each side) i had to get).

Anyways Before the muffler shop changed them out --the check engine light had been on for months and I knew what the problem was but didn't have the $$ to fix it. But the codes before getting the Cats put in were that 4 cylinders were misfiring. After the new Cats were in --I still had cylinder #5 misfiring-(i was thinking these plugs were probably fouled and they needed to be changed).

Being the industrious person i am-- I decided to change all 12 plugs--thinking This will fix my problem with my slight wobbly stationary idle. Well sure enough --i started the car up after changing the plugs and she purred like a kitten, not idling probems at all(but when i took it on the road it was another story).

I took off down the highway and noticed that when i punched it --there was not the usual get up and go that would normally be there when you punch it. I traveled about 5 miles down the highway doing speeds in excess of 85mph trying to break the car back in--you know--new plugs--new cat converters--etc.... But when i got to a cross over in the road to come back home it almost stalled and died on me right there. There car was idling very rough --almost as if the car was choking or something???

I got back to the house and just sat and idled the car--and man was it ever rough. I turned the car off and then turned it back on(about 15min later) and the thing sounded beautiful(purred like a kitten)--but when i take it out--it has a horrible idle and it feels like when you give it the punch of gas it just wants to sit there and barely move. After traveling around the highway and coming back it idles around 500rpm in gear if that helps.

Can anyone help me?

Am I looking at

1. MAF- replacement
2. ICV
3. new Plug wires maybe?
4. OVP
5. is this a timing issue now?

I can go back over to the muffler shop tomorrow and have him clear the codes and see if the check engine light comes on again and see what new codes come up but I figured one of you guys here would have a pretty good idea where i would need to start.

Thanks guys
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post #2 of 6 (permalink) Old 03-22-2011, 01:25 PM
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The short answer to the 5 items you asked about is yes, or no, or some, or all, and maybe more or possibly less!

When you go back to the shop, write down all the codes that are showing when the mechanic does the scan. That will help show us where to focus. Sounds like something is causing multiple miss fires or random miss fires that could be shutting down one or more clyinders. What type (part number) plugs did you put in?

Report back with codes.

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post #3 of 6 (permalink) Old 03-22-2011, 03:06 PM
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Step one, please click user cp and edit details to add your vehicle and location to your profile, it's useful information.

Step two, come visit us in the W210 forum, there is lots of help there and the help stickies are full of information

Step three, get the codes read. There are hundreds of reasons for a CEL and lots for misfires, too, so there's no point in guessing. Start with reading the codes (some auto parts stores will do it and Aamco will read them for free) and write them down, then search them in the 210 sticky or post them in the 210 forum. We'll get you pointed in the right direction.

Good luck and we'll see you down the forum in the 210 section.

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #4 of 6 (permalink) Old 03-22-2011, 04:01 PM
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Ditto to the codes suggestions and joining us down under here on the W210 forum.

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post #5 of 6 (permalink) Old 03-22-2011, 04:14 PM Thread Starter
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Sorry to waste your time--i should have posted sooner--After spending almost $2000 on New Cat Converters--i still had the misfire on #5 cylinder

I ended having to have a valve job done, head re-surfaced, gaskets replaced, one or two valve stems replaced all on the left side because of misfire in #5 cylinder. After changing the plugs my mechanic asked if I had kept the old plugs --the one especially out of #5 and as soon as he saw them he showed me oil--i guess that was a bad thing.

After all that though --there was a few minor things that still needed to be looked at and that was #1 and #4 spark plug wires were showing high resistance--so instead of paying $70 a wire for 4 wires i ended paying $305 for the entire set and had them replaced...

Total Job--not at a mercedes dealership--$2100.00--
At a Mercedes Dealership it would have cost me probably close to $5000.00

Sorry to trouble you guys and i should have posted sooner --but that car will absolutely scream now !!!
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post #6 of 6 (permalink) Old 03-23-2011, 09:05 AM
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Originally Posted by lunker View Post
Sorry to waste your time--i should have posted sooner--After spending almost $2000 on New Cat Converters--i still had the misfire on #5 cylinder
All because of a bad MAF no doubt.

NEVER take OBD codes literally--they show the result, not the cause in many case and with your engine the MAF is a notoriously well-known failure item.

Kent Christensen
'07 GL320CDI
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