My 88 S10 Blazer is blowing some serious white smoke out the exhaust after it warms up and goes down the road. It is apparently getting tranny fluid into the exhaust somehow. It idles and revs OK then when you go it starts burning something. The oil is still clean but the tranny fluid gets low after the test drive. Does anybody know how this can happen?

 

Ive never seen or heard of tranny fluid getting in the exhaust... It sounds more like you have a blown head gasket on the engine...I would research that problem a little more, b4 you take and have a 1500.00 tranny put in to do the same thing...Transmission fluid does not travel thru the eng block at all,, Try to diagnose that a little better b4 jmping to items that arent technically involved in what your saying is the problem with the smoking...how much of the tranny fluid is disappearing?

 

Well, I had a '82 Oldsmobile Cutlass that was burning tranny fluid when you took off from a stop. My mechanic replaced the modulator valve (aka crossover valve) on the tranny and problem solved.

 

This is a replacement engine because we felt the head gasket was blown on the first one. It did the same smoke problem. This engine is used but low miles 67K. It seamed to burn about 1/2 quart in a few blocks. There is an oily type liquid coming from the tail pipe.

 

check your trans pan and you trans gasket it may hav leaks that may be dripping on to your exahust causing it to smoke and it also may be migrating to the tail pipe because of how much fluid is being lost

 

There is no visible fluid falling on the exhaust. I have been looking at this transfer case since my last post. I see the 3 vac lines going to it. Above them there is another bigger vac line (about 5/8") that connects to a metal tube over the transfer case. The bigger vac line appears to have a tear in it. It looks a little shiny wet but there is no puddle of tranny fluid under it on the transfer case. Does this help with the diagnosis?