Question about 1983 Toyota Pickup
I have a 1983 toyota pickup truck with 22r four cylinder engine with a carburator.The problem started about two weeks ago,I was driving it and all of sudden engine started too run rough and black soot was coming from the exhaust.When engine warmed up it started too do this.I checked the carburator and decided to rebuilt it but it did not do any good.I have checked the timing and it is okay.It seems it only does it when the engine is warmed up.
Toyota engines have a built in TSTV- thermo controlled vacuum system where vacuum is applied to the choke system in various levels as according to the temp. of the engine. If the TSTV is faulty or if the vacuum pipes are incorrectly placed then you have a choke which is not opening up properly. Fuel is thus not burnt completely and due to the incomplete combustion there is a formation of soot on your exhaust. Try to get the choke to open up in relation to the temp of the engine. The fuel/air ratio alse needs to be checked ( idle mixture control) once you have the vacuum system working properly.
Posted on Nov 19, 2009
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Posted on Jan 02, 2017
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