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| How check errors in Mercedes 190 2.3 16v | |
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| Tweet Topic Started: Sat Jan 18, 2014 11:58 pm (1,099 Views) | |
| Bocian46 | Sat Jan 18, 2014 11:58 pm Post #1 |
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Hi guys, I will like to check faults in mercedes 190 W201 2.3 16v...Engine is not sound very good (idle is jumping,fuel consumption is go up (last time I done 46 miles for 14.5 l fuel................). Car have 184000 miles on clock. I buy diagnostic led code reader but down to book what I get tester is to use for 8 pin and 16 pin plug. I have around 9 pin conector plug in car and no 3 is empty... The led tester have 3 cables (green,white,black). Could somebody will be so kind and let me know step by step how I should plug this in and flash codes details. I will be thankful for help!!! |
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| gibpetrolhead | Sun Jan 19, 2014 7:40 pm Post #2 |
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Use the search function for your idle issues.
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| Bocian46 | Sun Jan 19, 2014 8:25 pm Post #3 |
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gibpetrolhead are you think I will ask If I will find already answer?????? |
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| barretts02 | Sun Jan 19, 2014 8:35 pm Post #4 |
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Unfortunately you can't use the diagnostic plug to read fault codes like a newer car with OBD-II. Do you have a multimeter? They're worth buying if you want to work on older cars like these. A common problem is the OVP relay (over voltage protection relay) goes bad and stops giving power to the ECU, this can give many problems, including the ones you're having so that might be worth a check. There are quite a few posts on the OVP relay on this forum unfortunately ![]() Here is a list of what the pins do on the diagnostic plug I found on the forum. I also have a 2.3-16v like you and because it is quite old you won't have a connection in pin 3 to measure the lambda. 1 RPM signal, 0 to 12 V, 4 pulses per revolution. A frequency of 43.3 pulses per second corresponds to the desired idle speed of 650 RPM. (To check your tachometer you could measure the frequency at this pin and multiply by 15 to get RPM.) This signal is derived from the ignition amplifier and is synchronized with the low side of the ignition coil. 2 GROUND 3 Lambda on/off ratio, 0 to 13.6 V, 100 Hz. This is not a replica of the output of the oxygen sensor. The "duty cycle" in Mercedes literature refers to the percentage of time this signal is low. Longer duty cycle (lower average voltage) = lean, shorter = rich. 4 Low (negative) side of the ignition coil. This is where to monitor the dwell angle of the electronic ignition amplifier, and is also a good place to view a reflected and attenuated image of the spark. This is about 50 VPP, safe for an ordinary oscilloscope. 5 Hot (battery voltage) in Run or Start, NOT FUSED! This is actually the positive side of the ignition coil. 6 Hot at all times, through fuse 2 7 Shielded cable from TDC sensor. This is not the same sensor which triggers the spark control unit, but it could be used in a clever circuit with pin 1 to measure spark advance. 8 Shielded cable from TDC sensor. 9 Shield for pins 7 and 8. |
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| stwat | Sun Jan 19, 2014 8:47 pm Post #5 |
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Have you checked the valve clearances? |
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| barretts02 | Sun Jan 19, 2014 9:03 pm Post #6 |
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Whilst you're there with the cam cover off you might as well check the timing, make sure it hasn't jumped a tooth or 2. |
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| gibpetrolhead | Sun Jan 19, 2014 9:09 pm Post #7 |
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If you have done the basics, sparkplugs, leads, distributor and rotor arm. Then check for vacuum leaks (damage to the rubber pipes) on the induction side of the engine, spray WD40 on the rubber to find these and replace as necessary. If they all work correctly then your car is still running too rich and that is why the fuel consumption is too high. The best thing to do is have a Bosch technician service the K-jetronic induction system on your car, if that's not possible then you should lean the mixture. Warning be very careful! if you turn the screw to far it will come loose and you won't be able to fix it. Check the topics and information at the top of this page they will help. http://mercedes-190.co.uk/forum/5954/ |
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| Bocian46 | Sun Jan 19, 2014 9:31 pm Post #8 |
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Thanks guys, I have car only for around 3 months....I already done many std jobs (Full service,exhaust pipe,etc). Fare I know last owner drive car only ones per week....I know have high mileage but anyway 184000 for STAR is nothing.... I must learn how work with this car:))))) |
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| gibpetrolhead | Sun Jan 19, 2014 9:46 pm Post #9 |
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If the car was sitting for a long time before you bought it, it will need if you haven't already done it, a long drive to clear the cobwebs.
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| Bocian46 | Sun Jan 19, 2014 10:05 pm Post #10 |
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Already have long drive I will check everything around engine,etc but if I not find nothing I must find somebody around Banbury (oxfordshire) who have STAR and hi show me everything.....But I will not go to local garage because before they even start they charge 200-300 pounds..........
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| gibpetrolhead | Sun Jan 19, 2014 10:15 pm Post #11 |
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Look for your nearest Bosch service centre they will be able to sort it out. |
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| stwat | Sun Jan 19, 2014 10:21 pm Post #12 |
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It's pre OBD lett alone STAR. You need an old school merc indi or a Bosch specialist as Gib says, |
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