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#1
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1987 260E stumbles and stalls after warming up (after sitting over weekend)
My 1987 260E stumbles and stalls after it gets to temperature. This only occurs after it sits over the weekend. I have changed the fuel filter, OVP, voltage while running is 13.68 on the batter terminals. Seems like this might be related to a sensor problem. Seems like the battery is running low on voltage or something. The alternator was checked at my local parts store and they said it is good. I am stumped and so is my local garage.
Thanks, Bob.
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1987 Mercedes 260E (W124) 213,000 miles 1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold) |
#2
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13.6Vdc is plenty. That won't cause a stalling issue.
When you say stall, do you mean that while idling the engine shuts off?? Will the car re-start? Does it ever quit while driving? (foot on gas pedal)
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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The car starts to stumble while I am driving around 35mph, but it has not stalled unless I take my foot off the gas. Usually when it starts to stumble, I head for the nearest side street to get out of traffic. The last two times this has happened, the car stalls when I take my foot off the gas as I am turning the corner. This last time I was able to restart the car after around 10 seconds of cranking and pressing on the gas to keep it going. Once it restarted I did not have any problems driving home.
I am wondering if a failing crank position sensor would cause this problem. Thanks, Bob.
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1987 Mercedes 260E (W124) 213,000 miles 1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold) |
#4
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Bob, I would attribute your engine's stumbling/stalling problems to a faulty Oxygen sensor. When was it replaced last?
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Fred Hoelzle |
#5
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I reviewed the vehicle records for the last 100,000 miles and I do not see where the oxygen sensor was changed. Is it possible it still has the original oxygen sensor? Thanks, Bob.
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1987 Mercedes 260E (W124) 213,000 miles 1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold) |
#6
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I checked the O2 sensor voltage today. The values were 0.36 volts when first started and .07 volts when the engine was warm. I disconnected the O2 sensor and I did not notice any problems. This leads me to think the O2 sensor is bad. Opinions? Thanks, Bob.
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1987 Mercedes 260E (W124) 213,000 miles 1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold) |
#7
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O2 sensor should not cause it to stall while driving, it will simply default to a fuel wasting rich setting if it gets an illogical O2 reading....
I'd bet on the crank position sensor....that's what it was when my 300E had those symptoms, only did it once warmed up (resistance changed from temp). On mine I have the california LED light code plug, so it actually gave me a CPS illogical code after it stalled a couple times.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#8
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Those voltage readings suggest it may be time to replace the O2 sensor. You probably already know this, but you should be seeing fluctuating readings between about 0.2v and 0.8v.
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1988 California version 260E (W124) Anthracite Grey/Palomino Owned since new and still going strong and smooth MBCA member Past Mercedes-Benz: 1986 190E Baby Benz 1967 230 Inherited from mom when she downsized 1959 220S Introduced me to the joys of keepin' 'em goin' There are only 10 kinds of people in the world--those who understand binary and those who don't |
#9
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I am going to retest the O2 sensor by pulling a vacuum line to see if goes more lean and then forcing the engine to go rich. I am wondering if my mixture is way off. Also, is there anyway to test the crank position sensor? I hate to keep buying new parts before I test ensure they are truly bad. Thanks, Bob.
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1987 Mercedes 260E (W124) 213,000 miles 1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold) |
#10
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I disconnected the O2 sensor, drove it around town, and noticed zero difference. This tells me the O2 sensor is not working properly, so I ordered a new one. Thanks for all your help. Bob
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1987 Mercedes 260E (W124) 213,000 miles 1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold) |
#11
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Bump. What was the outcome? Did the sensor at least improve your fuel economy?
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1990 300TE "24 hours in the day. 24 beers in a case. Coincidence? I don't think so." |
#12
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I hope to have the sensor installed this weekend. I will let you know after I drive it a few miles. Thanks, Bob.
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1987 Mercedes 260E (W124) 213,000 miles 1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold) |
#13
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I swapped out the old O2 sensor and so far my "seat of the pants" analysis says the car has more power. The voltage is oscillating between .1 and .9, which, from what I have read, sounds correct. I am hopeful my fuel economy gets better too. Now I just need to fix the rough idle and sporadic miss. Any ideas? Thanks, Bob.
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1987 Mercedes 260E (W124) 213,000 miles 1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold) |
#14
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The mileage has gone from 16 to 21.5 and I hope it will go a little higher after I adjusted the duty cycle from 10.8 volts to 6.2 volts.
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1987 Mercedes 260E (W124) 213,000 miles 1971 MB 220 w/ 4 spd manual (W115) "Suzy" (sold) |
#15
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That's a mighty impressive improvement in fuel efficiency! Is that "city" mileage or "highway" mileage or some blended average mileage? The EPA ratings on that car are 18/22 mpg.
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1988 California version 260E (W124) Anthracite Grey/Palomino Owned since new and still going strong and smooth MBCA member Past Mercedes-Benz: 1986 190E Baby Benz 1967 230 Inherited from mom when she downsized 1959 220S Introduced me to the joys of keepin' 'em goin' There are only 10 kinds of people in the world--those who understand binary and those who don't |
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