2000 ml320 rough idle dealer wants to charge $1100 - Mercedes-Benz Forum

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post #1 of 13 (permalink) Old 11-19-2008, 07:15 PM Thread Starter
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2000 ml320 rough idle dealer wants to charge $1100

I have a 2000 ml320 that shutters or idles rough when stopped. Drives fine, shifts fine, only shutters when I come to a stop or idle. I had Mercedes replace all of the spark plugs since the vehicle does have 113K miles and also had them do an injector cleaning. Impoved ever so slightly but still has a rough idle. It idles rough about 75-80% of the time. No apparent reason why it does or does not do it. I just took it back in and now they want to charge me $350 to remove all of the injectors and test them, then $130 for each injector that may be bad. They also said they could replace the EGR valve for $130 ($75 Part). There is no lights coming on and before the plugs where replaced the #4 plug was showing a misfire but was resolved with the plug replacement. I just don't want to spend all this money if this isn't even the problem. Any suggestions from anyone on what I should do???? Any help would be greatly appreciated.
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post #2 of 13 (permalink) Old 11-19-2008, 07:25 PM
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I would take it to a few independent garages and see what they say is wrong... The dealer likes to guess at what is wrong because it is at your expense..

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post #3 of 13 (permalink) Old 11-19-2008, 07:32 PM
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How many miles are on your ML and did they hook it up to the Star Diagnostic system? Like the other poster said, it sounds like they are just guessing.

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post #4 of 13 (permalink) Old 11-19-2008, 07:36 PM Thread Starter
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It has 113K miles on it. I would certainly hope they hooked it up to a diagnostic machine since I am paying $105 just to have them look at it. But your right it sounds like they are guessing to me to. The only thing they could find the last time I took it in was the misfiring #4 cylinder which I replaced all of the plugs, I wonder if I should go for new wires as well?
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post #5 of 13 (permalink) Old 11-19-2008, 07:40 PM
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If the wires have 113k on them, you might as well change the wires since you already changed the plugs.

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post #6 of 13 (permalink) Old 11-19-2008, 07:52 PM
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$95-$105 is the customary charge for the Star Diagnostics so I'd say they have done that.

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post #7 of 13 (permalink) Old 11-24-2008, 05:17 PM
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THERE IS AN EGR TUBE IN THE BACK OF THE INTAKE...REMOVE THAT TUBE AND I CAN JUST ABOUT GUARNTEE THAT IT IS ALL CLOGGED...CLEAN THAT AND SEE WHERE IT TAKES YOU.. ITS EAST TO TAKE OUT...2 TORX AT BACK OF INTAKE AND A 22 WRENCH...YOU HAVE TO PLAY WITH THE TUBE A LIL FOR IT TO COME OUT,...
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post #8 of 13 (permalink) Old 11-24-2008, 06:18 PM
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Originally Posted by amgkid20 View Post
THERE IS AN EGR TUBE IN THE BACK OF THE INTAKE...REMOVE THAT TUBE AND I CAN JUST ABOUT GUARNTEE THAT IT IS ALL CLOGGED...CLEAN THAT AND SEE WHERE IT TAKES YOU.. ITS EAST TO TAKE OUT...2 TORX AT BACK OF INTAKE AND A 22 WRENCH...YOU HAVE TO PLAY WITH THE TUBE A LIL FOR IT TO COME OUT,...
this will not cause a rough idle. a egr valve that is stuck open can cause a rough idle. but the clogged tube will only cause a check engine light for an egr chain malfunction. you are wrong.
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post #9 of 13 (permalink) Old 11-24-2008, 06:20 PM
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Originally Posted by luvinlife View Post
I have a 2000 ml320 that shutters or idles rough when stopped. Drives fine, shifts fine, only shutters when I come to a stop or idle. I had Mercedes replace all of the spark plugs since the vehicle does have 113K miles and also had them do an injector cleaning. Impoved ever so slightly but still has a rough idle. It idles rough about 75-80% of the time. No apparent reason why it does or does not do it. I just took it back in and now they want to charge me $350 to remove all of the injectors and test them, then $130 for each injector that may be bad. They also said they could replace the EGR valve for $130 ($75 Part). There is no lights coming on and before the plugs where replaced the #4 plug was showing a misfire but was resolved with the plug replacement. I just don't want to spend all this money if this isn't even the problem. Any suggestions from anyone on what I should do???? Any help would be greatly appreciated.
you need new wires for the cylinders that are misfiring. if you really wanna smooth it out replace all the wires (suppressors as MB calls them) they are expensive. i have seen a rough idle fixed by replacing 4 wires. not the plugs, not the coils, not the injectors, not a MAF. 4 wires!!!!
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post #10 of 13 (permalink) Old 11-25-2008, 01:19 PM
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Originally Posted by carminemb82 View Post
you need new wires for the cylinders that are misfiring. if you really wanna smooth it out replace all the wires (suppressors as MB calls them) they are expensive. i have seen a rough idle fixed by replacing 4 wires. not the plugs, not the coils, not the injectors, not a MAF. 4 wires!!!!
Exactly.

The wires are $30 each or more and there are 12 of them. Replace the ones that need replacing only.

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