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#16
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I apologize for the sarcastic responses above. The responders took the position that the original poster did not know what he was talking about, when in fact he was the only one who did know what he was talking about.
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2012 E350 2006 Callaway SC560 |
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Did you ever resolve this problem?
My recently purchased 300E runs excellent with one exception. It sometimes stalls right after starting or stumbles for few seconds until idle stabilizes. I checked the duty cycle from X11 connector and here are the results: Ignition On, Engine Off: 50% Engine at Idle: 48%-54% Engine at 2,500RPM: 68%-72% What would cause it to be 50% and not 70% with engine not running? Last edited by r0nd3L; 05-30-2010 at 07:33 PM. |
#18
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Quote:
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#19
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I have not and actually, ABS light came on few times while I was testing the duty cycle.
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#20
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Sounds like the classic OVP failure symptoms.
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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 |
#21
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I have the same reading Key-on Engine-off, that is, 50% exactly.
Pins 2 and 3 on the X11 connector read 6.25V KOEO, and battery voltage with the engine not running is 12.5V, giving me exactly 50%. The FSM clearly states that there are only two readings for duty cycle KOEO, 70% for CIS-E systems with fault diagnosis (my 300SE) and 100% for CIS-E systems without fault diagnosis (presumably some european models). At idle I get voltage readings that fluctuate between 1.7 and 2.7, averaged that gives a duty cycle ratio of 85%, super lean, right? I am chasing down a similar problem as the original poster: car usually stalls right away after starting, and runs rough for 5 seconds or so before smoothing out. Otherwise it runs great. Also, I noticed that at idle the economy gauge reads in the middle of the scale. So I might have a vacuum leak in addition to whatever is causing the 50% KOEO reading. The vacuum leak might explain the super lean idle reading of 85%. So back to the original posters question: what exactly does a 50% duty cycle reading key-on engine-off indicate? Can I safely go out and buy a new OVP? Or is there anything else that can cause the 50% reading? (the ABS light is not coming on at all). Thanks.
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1972 280SE 4.5 1984 300SD, 250K 1991 300SE, 89K 1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn) 1994 E320, 109K 1995 E420, 60K Proud Member of the Mercedes Benz Club of America - Idaho Chapter |
#22
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Me too ...
Quote:
Mine used to read 70% (or 75, whichever is right) and now it reads 50% ignition on/engine off. It hovers nicely around 52 % now and the car is running well. Did anyone find an answer as to why some are getting 50% engine off? Or did they all get tense and pre-menstrual about posting style and then boycott the thread? I'm sure many would like to know if any of the seriously brainy boys would help. By the way, mine was not OVP related. Thank you in advance. RayH |
#23
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Ray, I'm not one of the seriously brainy boys you're looking for, but I've had similar duty cycle test results, with a 90% engine running measurement. Super lean, right? Yet the fuel consumption/mileage has declined to the mid-teens city/21 hwy. At some point, I'd think we should be taking the next step and testing the O2 sensor and EHA. Maybe the seriously brainy crowd can weigh in on that, too.
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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 |
#24
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I'm attacking this issue across a few cars.
190E 3.0 reports 70% Key On Engine OFF 420SEL reports 30% Key On Engine OFF 560SEL reports 80% Key ON Engine OFF 190E then throws a 50% code once its been start and has been running for a while. 420SEL runs normally, a little rich but operations are normal. 560SEL has a high idle problem, and continues to throw 80% fault. I was talking with a gentlemen over on BenzWorld and he thinks that if the system throws a fault number with Key On Engine off that the device associated with that fault has given the CIS unit an improbable input or an input that is way beyond out of spec... Example: 30% on a 126 is a Coolant Temp Sensor Fault. If the system is throwing this when key on engine off, then he and i suspect the CTS has gave the CIS-E a goofy value..CIS-E expected range x to y, and CTS provided something no where near that.. Thats our running theory right now, I'm going to change the CTS on my 420 and see if that clears the problem.. Lots of people having this same "problem".. Hopefully we'll get our heads around it.
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#25
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Good to see the thread rejuvenated ...
Sounds like a sound judgement.
I'm going to start (soon) reading fault codes - I've concentrated on gearbox codes with excellent results. More as it happens but it'll have to be after the weekend. Thanks for response. RayH |
#26
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Ray, what car do you have?
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#27
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I have a 1991 300CE-24 Sportline with Bosch KE Jetronic (CIS) injection and 5-speed 722.5 auto box. 350 K Kms on the clock.
I built a code reader (count the flashes, not too sophisticated!) and this enabled me to erase a gearbox fault that had put the 'box into some sort of safe mode. It's now performing as it should be with all 5 gears. Component cost of reader: €15. I read the codes from the 16-pin (4 mm sockets) diagnostic connector close to the battery. Oddly, I've seem more information on the socket related to W129 cars than W124. Nonetheless, it is installed on a limited range of W124 cars. I shall use the same reader to examine engine issues, possibly this weekend, weather permitting. More as it happens. RayH |
#28
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If this helps at all, it's on my '91 300SE with the 103 engine, 49-state.
Key on engine off, but warm: - DC = 50%, always has since 1991. - Open the throttle between 10% and 90% open, DC = 10%. - Open the throttle all the way and engage the under-pedal switch, DC = 20% - Press the air valve down, DC = 40%. Crank the engine: - DC switches momentarily from 50% to 70%, then back to 50%. - After a few seconds, DC begins to fluctuate around 50%, as O2 sensor comes in. All the above makes sense to me: Initial 50% without lambda control is normal, either without engine running, or before O2 sensor warms up. Opening throttle with engine off should set a 10% fault code, which is throttle position fault. Opening the air valve with the engine off should set a 40% fault code, which is an air valve fault. So, I conclude those portions of my system are performing OK. But I still have the 5-second hot-start chugging problem, which I have been chasing for 10 years. DG o |
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