Question about 1995 Nissan Sentra
I have replaced two throttle chambers and on the third one now. However, after installing this brand new throttle chamber, the engine would misfire randomly when driving along anywhere above 80kmh. When it happens, the misfire can be very mild to jerky accompanied by lots of white smoke from the exhaust. After a few minutes, it clears and the engine is back to normal and runs smoothly.
Over a 200km distance I travelled today, I have noticed the misfire would start especially when driving up on a sloping road. It also happens at other times even on level roads and at random. Brought it to the mechanic, changed new spark plugs, fuel filter and diagnose with Consult-II but still the problem won't rear its head in the workshop.
Inspecting the spark plugs they appear clean and normal, not oily or soothy.
The white cloud of smoke, is that unburnt fuel mixture? If it is so, could the new throttle chamber be faulty or the distributor / coil is faulty?
When my two previous throttle chambers acted up, the engine would spatter and belch black smoke and die as soon as the engine warms up to normal operating temperature. The car then would be undriveable.
The MIL light was not even lighted like in the previous incidences.
Would appreciate if anyone have had the same experience and share what to do to fix this problem.
I have a 1995 Nissan Pulsar and had the same problem with the engine just as you explained, with the white smoke and backfiring, the problem was the pcv valve had failed and the oil was being sucked from it through the vacuum pipe attached to it. the oil would go into the inlet manifold and go into the combustion chamber. I had practically changed everything around the engine block before finding the problem. And also, the MIL light never came on.
Best Of Luck.
Posted on Sep 06, 2010
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