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Registered User
Join Date: Oct 2008
Posts: 315
smoking 1995 E38 740i

just picked up a very nice looking 95/740i that the PO said no one could fix... I like a challenge so I bought it. starts up fine,after a few minutes runs rough smokes very bad, (Transmission fail safe warning is on) he had the transmission rebuilt ,and same problem.took out for a quick road test ,stuck in first gear and RPM is 1500 with lots of smoke ,no engine noises,when starting cold at idle sounds very good till the smoke comes. Is there a problem with the crankcase oil vent under the manifold plate? coolant does not go down at all. thanks for any help Greg
Old 07-23-2011, 10:34 PM
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shogun's Avatar
Join Date: Feb 2009
Location: Japan
Posts: 496
what kind of smoke is it? black, blue or white?
If it would be the crankcase vent, then it would be oil, but you are talking also about coolant does not go down? You mean coolant temperature?
Have you made a chemical test of the coolant? Chemical Block Testing

A chemical block test can reveal hidden problems that cause mystery coolant loss, overheating, poor heat output, and even lean codes. Cracked or warped heads along with bad head gaskets can cause those problems long before any serious symptoms are noticed.
Also know as a combustion leak test, the tech uses a special cylinder that fits in the neck of the radiator or coolant reservoir and uses a test fluid (normally deep blue) that changes color to green or yellow on the detection of combustion gasses in the cooling system.
It's good practice to have a chemical block test performed anytime you suspect that an engine has overheated. This can reduce diagnostic time and unnecessary parts replacement. So much so, that some shops perform a chemical block test as the first step in their diagnostic strategy..

It's also a good idea to have a chemical block test performed on vehicles that are being inspected before purchase. Some sellers use tricks to mask cooling system defects, and a block test may reveal an otherwise unseen problem.
Old 08-05-2011, 02:24 AM
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Join Date: Oct 2008
Posts: 315
Thanks for your reply Shogun, I think I have found my smoking engine problem,took apart and seems to be the OSV valve for the pcv system ,the other shops had replace the rear of the manifold pvc system with no luck,when I went a little further found the OSV valve to have a rotten lower rubber seal ,allowing oil to enter the pvc system and sucked into the intake system . I managed to remove the valve by cutting it in sections without dropping any plastic pieces in the lower timing chain area.Now my new QUESTION is how to replace this valve with the new one? Can it be done by very careful marking top chain and gear,and will it slide in? also sorry, was not clear about the coolant level in the expansion tank was at a perfect level and passed a pressure check.
Old 08-09-2011, 11:32 PM
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