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#1
08-17-2005, 11:56 AM
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Gray smoke out back when accelerating
 1992 190E 2.6, 204K milesSeems to run well around town and such. When accelerating to enter the highway - about 5,000RPM some smoke appears to be gray billows out the tail pipe. The acceleration continues, though the 190E was never a rocket. My concern is air pollution - I feel bad spraying that much ugly smoke. Could it be Fuel Injectors - they have never been replaced? Could it be Valve Seals - They have never been replaced, and I seem to notice a puff of black smoke at start up - though not much. Currently adding 1 quart of oil at 500 miles. I have the equipment and plan to do a cylinder pressure test. Your thoughts and suggestions please.
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Thanks for the help Bill Fisher '86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle 02 E430 in the stable '14 LS460 (Lexus) - - - - - '95 E420 (198K) found a new home '99 E320 (80K) (gave it's life for me as we hit a bumper) '95 E420 (231K) Sold to a happy buyer, new to Mercedes '90 300E (65K) Sold to an Mercedes Lover '92 190E (215K) - retired to the salvage yard '93 500SEL (214K) - Moved to another family, still runs like a young pup 
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#2
08-17-2005, 03:28 PM
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Could be coolant entering the combustion chamber due to a bad head gasket.
Bruno
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_ 1992 300TE 160 kmiles
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#3
08-17-2005, 04:48 PM
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If you are using a quart every 500 miles you most likely have some seriously worn wrings, seriously bad valve stem seals or a blown head gasket.
Grey smoke is a sign of oil burning. White would be coolant.
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~Jamie _________________ 2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's. 1986 190E 2.3 Black, Auto, Mods to come soon.....
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#4
08-17-2005, 06:26 PM
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well
i always think of oil as blue. is the grey dark or light? valve seals generally leak when decellerating with the foor off the gas. rings under acceleration. running too rich could be dark gray. coolant (steam) is easily distinguished because it disappears right away.
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#5
08-17-2005, 07:42 PM
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your
your engine is wore out and need to be rebuilt...
it will be a great experience for you....do it now and it wont cost a lot of money...
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#6
08-17-2005, 11:16 PM
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The smoke is more gray
Thanks for the comments - Gray is my best description
I don't notice any ringing or exhaust output when I decelerate - that is let off on the gas and just coast. I am thinking the engine could stand some attention. Perhaps a rebuilt head. A friend drove behind me today in traffic; he didn't see anything emitted from the tail pipe. 
__________________
Thanks for the help Bill Fisher '86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle 02 E430 in the stable '14 LS460 (Lexus) - - - - - '95 E420 (198K) found a new home '99 E320 (80K) (gave it's life for me as we hit a bumper) '95 E420 (231K) Sold to a happy buyer, new to Mercedes '90 300E (65K) Sold to an Mercedes Lover '92 190E (215K) - retired to the salvage yard '93 500SEL (214K) - Moved to another family, still runs like a young pup
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#7
08-18-2005, 08:55 AM
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Quote:
The biggest most noticeable part of the post was that he is using 1 quart of oil every 500 miles! That is some hefty oil loss and is most likely burning it due to the smoke he sees. Most likely a head gasket, but I was being nice and saying other things as well. Valve stem seals and rings even when worn pretty good will not allow a full quart in most cases to be burned in 500 miles. At higher RPM the head gasket will tend to leak more if it is going south. He should check his oil and coolant for any oil or coolant where it should not be. With that kind of loss it is either leaking out of the engine and down the block or into the combustion chamber. Either way something is seriously leaking. And the M103 motor is known to have head gasket issues after a certain amount of miles and time.
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~Jamie _________________ 2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's. 1986 190E 2.3 Black, Auto, Mods to come soon.....
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#8
08-18-2005, 01:55 PM
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I've poked around
The radiator has plenty of antifreeze (nice and yellow).
There is no oil in the coolant. I do suspect the head is ill. Shall I have the timing chain replaced "while in there"? This weekend I'll check the compression pressures between cylinders BTW - there are drops on the driveway, but no big oil spots.
__________________
Thanks for the help Bill Fisher '86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle 02 E430 in the stable '14 LS460 (Lexus) - - - - - '95 E420 (198K) found a new home '99 E320 (80K) (gave it's life for me as we hit a bumper) '95 E420 (231K) Sold to a happy buyer, new to Mercedes '90 300E (65K) Sold to an Mercedes Lover '92 190E (215K) - retired to the salvage yard '93 500SEL (214K) - Moved to another family, still runs like a young pup
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