I have a 98 model mazda bravo with a b2500 engine in it latly i have been experiencing problems with it blowing white smoke and not going over 2000rpm unless its cold.....sorry about incorrect model
With regards to the above problem, I have just recently experienced the exact same thing with a 98 Mazda Bravo b2500 (this is a diesel).The symptoms were after driving over some corrugated dirt roads the vehicle would not rev over 2000 rpm and at that point would blow heaps of white smoke and misfire, but would idle beautifully and rev smoothly up to the 2000 rpm. Also noticed when vehicle was cold it would drive good for about 5-10 mins then symptoms would start again.
Fuel filters were changed, sediment trap cleaned,different fuel tried and checked all lines and system for air entry, problem still persisted. While checking injector pump lift pump pressure I noticed that the pressure would drop right off at the 2000 rpm, maybe a lift pump problem?? After consulting the workshop manual I found there is a small stainless steel thimble filter under the injector pump fuel line input union bolt, held in place with a small spring. Pulled this out to have a look and it was full of crud, cleaned it all up and put back together and have a guess what......goes like a brand new truck!!
Cheers
Blowing white smoke is almost always a symptom of an engine coolant leak at the cylinder head gasket. remove each spark plug and look for a dis-colored plug to find which cylinder is leaking.
Not 100% correct, in colder parts of the world vehicles will use 100% anti-freeze in cooling system which may produce some smoke. While in more tropical areas the ratio could be as low as 30% which would produce steam. To the uninitiated may look like smoke, but will disipate quicker than smoke. If a head gasket is blown across a coolant port you may experience symptoms of slight over heating and coolant level constantly going down.
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