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#1
05-24-2009, 01:57 PM
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W124 - removing 2-pronged coolant temp sensor
Guys,
I want to remove the two-prong engine temp sensor because prior to closed loop operation the car has minimal power when the accelerator is pushed, and this job seems much easier than replacing the cold start valve (the problem is much worse in the cold weather). Since this is the last sensor on the head (closest to the firewall), and because of the alignment of the sides of the bolt I cannot get any grip with a wrench, It seems that to get a wrench on this sensor I must remove the valve cover gasket. Is this correct? Thanks. BTW, the car is an '87 300e.
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87 300e (white/black; amg body kit) 88 300ce (red/cream; amg body kit) 93 300ce cabrio (white/blue/blue top) 93 300ce cabrio (black/grey/black top) 98 ml 320 (totaled @ 137,000 miles) 99 clk320 (black/grey/black top) 
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#2
05-24-2009, 02:01 PM
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it only takes 10 minutes to remove the valve cover
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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 [/SIGPIC]
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#3
05-24-2009, 05:26 PM
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Quote:
Easier job but have you determined what the problem is ?
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http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg 1971 280SL ROADSTER 1988 300CE TWIN TURBO WIDEBODY 1994 E320 CABRIOLET 1999 C43 AMG 2005 G55K AMG 2008 CLK63 AMG BLACK SERIES
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#4
05-26-2009, 04:56 PM
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Until closed loop operation when engine reaches operating temp, there is hesitation when depressing the accelerator. This weekend I thinned the mixture a bit instead of replacing the temp sensor and performance improved, so I fiddle with that instead. I'd rather do the easiest things first.
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87 300e (white/black; amg body kit) 88 300ce (red/cream; amg body kit) 93 300ce cabrio (white/blue/blue top) 93 300ce cabrio (black/grey/black top) 98 ml 320 (totaled @ 137,000 miles) 99 clk320 (black/grey/black top)
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#5
05-26-2009, 10:22 PM
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On an M103, that sensor can be a pain to get at without pulling the valve cover, but I have done it. You just have to find a deep socket with skinny enough wall. Order a new valve cover gasket if you take the cover off because they are prone to leak.
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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#6
05-26-2009, 10:39 PM
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I tried the thinnest I have, but whoever installed it must have done so by taking off the valve cover, because one point on the sensor is virtually flush against the gasket-no room to slip a socket over it. Thanks anyway.
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87 300e (white/black; amg body kit) 88 300ce (red/cream; amg body kit) 93 300ce cabrio (white/blue/blue top) 93 300ce cabrio (black/grey/black top) 98 ml 320 (totaled @ 137,000 miles) 99 clk320 (black/grey/black top)
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