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MIKEY95

Member
Joined
Oct 30, 2010
Messages
5
City
Florida
Vehicle Year
1995
Transmission
Automatic
95 Ranger 3.0 2x4 automatic. Moisture smoke out the exhaust just like blown head gasket, performed pressure test on cooling system, everything fine,compression check, everything fine. not running hot, not skipping, disconnect exh behind CAT smoke stops instantly, install NEW muffler and smoke is back. disconnect and it stops again. truck is showing a code 335 which is high voltage at the EGR valve. is this the cause? used exsisting exh pipe, just changed muffler. tailpipe is very black with soot.
 
A certain amount of soot is normal for any internal combustion engine.

How much steam are we talking about? Little bit, big billowing cloud? Is it constant, or does it go away after the engine has run for a while. Water is a normal byproduct of the catalytic converter reaction. The converter's function is to break NOx, HC, and CO into nitrogen, water, and CO2.

After the engine and exhaust reach operating temp the water should be evaporating fast enough that your don't notice any steam.
 
BIG billowing clound, put a piece of steel against cat with muffler off so it would have a little backpressure, no smoke.
 
Im thinkin that even though your cat is working and putting off a little water. That maybe it is clogging up. This causes the exhaust gas temps to skrocket, which will evaporate the water, only place it can go is out the exhaust.
 

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