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  #1  
Old 02-01-2011, 11:27 PM
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E320 Idle Issue

I got my 320 Back on the road, Runs Beautifully, however at idle, there's what I'd call a Lope, The rpms drop, then recover etc I was told my fuel Tubes were filthy which I'll clean them out, but should I look at more? I was thinking about doing a tuneup now that it's working again etc. Open to suggestions

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Old 02-02-2011, 08:12 AM
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MAF
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Old 02-02-2011, 08:46 AM
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Originally Posted by Hirnbeiss View Post
MAF
or....ETA
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1989 300ce 129k
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1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


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Old 02-02-2011, 05:14 PM
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how would I go about checking them?
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Old 02-02-2011, 08:10 PM
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Or the rubber elbow (crank vent tube or other) that comes off of the bottom of the intake, ... crack and leak.
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Old 02-02-2011, 08:55 PM
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M104 engine has a non-OBD2 code system. You can make a code reader following some of the info on the forum here. MAF sensor usually goes around 130K or so and eventually throws a code, although you may get spurious other codes too.
Don't worry about your EGR tube, that just causes you to fail CA emissions, and doesn't give you bad idle.
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Old 02-03-2011, 12:52 AM
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well, if it makes any difference, the head was just off... and it idled fine before that..
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Old 02-03-2011, 08:11 AM
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How's the wiring harness? The insulation crumbles off on the W124 engine harness. Maybe you disturbed it.
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Old 02-03-2011, 08:59 AM
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I used MAF cleaner,and idle is fine.
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Old 02-03-2011, 01:54 PM
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Wiring harness is ok. but it's getting replaced as its about the age to do it, But I'm thinking it's the MAF or something.. I dont think it's a wiring issue
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  #11  
Old 02-03-2011, 03:39 PM
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Originally Posted by Aquaticedge View Post
Wiring harness is ok. but it's getting replaced as its about the age to do it, But I'm thinking it's the MAF or something.. I dont think it's a wiring issue
crc maf cleaner is only about 6 bucks at the auto shops
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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


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Old 02-03-2011, 03:45 PM
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where's the MAF so I can check it?
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Old 02-03-2011, 03:57 PM
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I should describe this a little better, when I start the car, the car runs fine, then as it warms up, the RPMS drop to 3-500 then revive to 1,000 and stay there for awhile, then repeat the process. I'll grab a video of it etc soon
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Old 02-05-2011, 01:10 PM
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back to the top.
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  #15  
Old 02-05-2011, 02:01 PM
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181K miles on the original wire harness must be some kinda record. I replaced the harness on my '95 E320 about 4 years ago when it had 64K miles on it. I had all sorts of idle and perforance problems that only got worse as I changed plugs, cleaned the MAF etc. I opened the old harnes and the wire insulation was a dry powder. I consider myself lucky that a short circuit didn't damage any electronics or start a fire.

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