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89 420SEL CEL on and sluggish performance
Hey Guys,
Just wanted to pick your brains on this problem. First off the car in questions is a 1989 420SEL (FED CAR) and has about 255k miles on it. A friend wanted me to look at it and see if I could find out why the CEL light is on and why it was sluggish in performance. I started out by checking the duty cycle and it was 100% or .08V at X11 pin 2-3. Looking over section 07.3 of the MB manual it says to check the O2 sensor. Since the owner couldn't remember when it was replaced, I replaced it with a Bosch replacement. The light is still there, the performance is still somewhat sluggish. I checked the Air flow potentiometer and found no voltage present at pin 1-3 or 2-3. I can unplug the connector at the potentionmeter and the idle does not change at all. Also, there is alot of fuel present in the mixing bowl. It looks like someone has been messing with the idle control screw and the CIS injection looks to be replaced. The OVP was checked as well, no rattle and the fuse is good. I have checked the grounds at W10 and W11 location. It looks like it may be the CIS-E control unit. Does anyone have any other suggestions or a good CIS-E Control unit I can use to test or where to purchase rebuild one cheap? Thanks.
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Chris 2000 S500 (SOLD) 1985 300DT (CA model) 113K Miles (SOLD) 1989 300SE 47K miles (SOLD) 1998 VW Jetta MK3 TDI (Totaled) 2006 VW Jetta MK5 TDI Last edited by giewont; 12-31-2005 at 10:56 AM. |
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Hi. Just wondering.... what is a "federal" car?
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Quote:
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#4
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Anyone? I am sure someone has seen this before.
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Chris 2000 S500 (SOLD) 1985 300DT (CA model) 113K Miles (SOLD) 1989 300SE 47K miles (SOLD) 1998 VW Jetta MK3 TDI (Totaled) 2006 VW Jetta MK5 TDI |
#5
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Federal cars turn the CE mil light on ONLY for O2 sensor problems!
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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 |
#6
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What is an CEL light? What does it stand for? I might be helpful if I knew it : ))..
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Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D 380SE 1984 <------- Totaled by flipping accident 300SE 1988 <------- Sold Volvo S70 2000 <---- 4 family Opel Omega 2002 <-- 4 family 560SEC 1989 <------ Sold 560SEL 1990 <------ Sold 560SEL 1991 <------ 4 my mother 560SEL 1989 <------ Sold 600SEL 1992 <------ Current http://search.ebay.com/_W0QQsassZkhazenzcc |
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ZCC,
CEL stands for "Check Engine Light". MB DOC, It has a new O2 Sensor, I just replaced it yesterday. Why does the X11 Connector only show .08V DC? And why is there not at least 4.5V DC at the Air Flow Position Sensor? I ask this because I went thru some of these tests on my 300SE. This monrning I had a heck of a time starting it up, it took several minutes of cranking before it finally started and ran but only with the accellerator depressed. It seems like it is running lean but the fuel bowl is wet.
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Chris 2000 S500 (SOLD) 1985 300DT (CA model) 113K Miles (SOLD) 1989 300SE 47K miles (SOLD) 1998 VW Jetta MK3 TDI (Totaled) 2006 VW Jetta MK5 TDI |
#8
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Does anyone else have any other suggestions? They would be much appreciated.
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Chris 2000 S500 (SOLD) 1985 300DT (CA model) 113K Miles (SOLD) 1989 300SE 47K miles (SOLD) 1998 VW Jetta MK3 TDI (Totaled) 2006 VW Jetta MK5 TDI |
#9
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Strange, all of the S class of the MB from 1986~1991 in Kuwait doesn't have an CEL light. Where is that light located? If possible to post a pic of it. Thank u.
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Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D 380SE 1984 <------- Totaled by flipping accident 300SE 1988 <------- Sold Volvo S70 2000 <---- 4 family Opel Omega 2002 <-- 4 family 560SEC 1989 <------ Sold 560SEL 1990 <------ Sold 560SEL 1991 <------ 4 my mother 560SEL 1989 <------ Sold 600SEL 1992 <------ Current http://search.ebay.com/_W0QQsassZkhazenzcc |
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ZCC,
It is the first light on the right-hand side of the instrument cluster (right below the speedometer where all the indication lights are). I can't take any pictures at this time.
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Chris 2000 S500 (SOLD) 1985 300DT (CA model) 113K Miles (SOLD) 1989 300SE 47K miles (SOLD) 1998 VW Jetta MK3 TDI (Totaled) 2006 VW Jetta MK5 TDI |
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