Question about Mercedes-Benz E320

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I have my rexton 3.2 ...now the problem is when im start it,the engine was running and not stable n some time ok...plug coil,plug new....i already do diagnostic n the fault code tell the (o2 sensor heater fault)(not defined)......i changed all o2 sensor,but still not stable...sometimes OK...exhaust have black smoke... the fault code some time have many,,some time a little bit..but same fault code...have a problem with my computer box or not????please help me!!!!

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: black smoke from exhaust

hi nishga
im dave; hope i can help

First you need to determine if it is actually black smoke or if it is blue smoke. There are three colors of smoke that can come from the tailpipe. It is not white smoke obviously because that is easily differentiated from blue or black and generally indicates water or antifreeze leaking past the head gasket and into the compression area of the motor. White smoke is the steam of the water/antifreeze being emitted

Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with white smoke, just a small drop of oil leaking into the cylinder can produce blue smoke out the tailpipe. Blue smoke is more likely in older or higher mileage vehicles than newer cars with fewer miles. The car has many seals, gaskets, and o-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plugs, it will cause a misfire(engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.

Black smoke is caused by excess fuel that has entered the cylinder area and cannot be completely burned. Another term for excess fuel is "running rich". Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a heavy fuel odour in the engine compartment. Some of the causes of excess fuel are a carburetor that is out of adjustment which is not likely unless you have installed an aftermarket carburated system on your non-carburated car, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or emissions sensor. If black smoke is present, check the engine oil to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Check the above mentioned systems and after detecting the trouble replace the faulty parts and then the engine oil and filter.

Posted on Jul 20, 2008

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fknstart
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SOURCE: Engine Fault light illuminates. Ford KA Collection

have you totally cleaned the fuse box and fuses

Posted on Jan 05, 2009

  • 2 Answers

SOURCE: 2005 silverado..5.3...motor idle rough.. getting 3 codes

p0171 and o0174 is lean replace intake gasket they will be a teal color,the old ones are red. i work for chevrolet.this is a common problem

Posted on Feb 12, 2009

  • 94 Answers

SOURCE: Check engine light flashes sometimes and runs rough

A flashing check engine light is a critical indicator. That usually means that something went wrong that will damage the emission control system... and that is usually an ignition issue. First off, the OEM plug your car calls for is an NGK irridium... NOT BOSCH and not anything with more than 1 prong. Those NGKs are like 2 bucks and they are the proper plug. Make sure you have these plugs and make sure they are gapped to .028. Next, my suggestion is put all the new stuff on again. Drive it to autozone and have them delete all the codes. Drive it around until the check engine light comes on again, then immediately go back and read the codes. The ECU is smart enough to know which cylinder is misfiring. On these cars, I think they have three banks of two... meaning one "coil" inside the coil pack operates two of the cylinders. So if you get multiple misfires, it's the coil. If you get one misfire it's probably an individual plug wire or plug. Good luck.

Posted on Jul 15, 2009

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SOURCE: oily spark plug,changed plugs now car smokes

You changed 6 coils, but you didn't change spark plugs? The new coils give strong spark to burn off resisdues from your old plugs plus what ever left inside the combustion due to bad old coils causing smoke and bad ordor. Change all new spark plugs so you can have good ignition to burn off all junks inside combustion chambers. Smokes are at the beginning, but it will go away after less than 10 minutes.
If it is not going away you may have other problemS:
Rich mixture causing engine check light come on.
Check if engine oil level.
Check if your coolant level.
Open the oil cap to see if you have milky stuff. If there is milky stuff then you have bad head gasket.
Let me know what is coming out so others can learn from your experience. Good luck.

Posted on Jul 19, 2009

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