Question about Nissan Pulsar

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Type of clouded fume from vent inside cabin

2000 Nissan Pulsar N16 Auto - Approx 115000kms Have fitted sports exhaust to try to improve performance on hills - helps a little but have to turn off aircon and take out of overdrive for any steep incline. Purchased the car about 1 year ago from Honda dealer and it is now serviced every 10000kms; second change of brake and radiator inhibitor fluid will happen at next service, 120000kms. I have just returned from a road trip, hilly terrain. Did the usual off with the aircon and out of overdrive, about 3000 revs to reach the top in hot weather. On 2 different occasions when I reached the top of the hill, back into overdrive and put the aircon back on, some sort of, almost smoke, came out of one of the vents inside the cabin. There was a slight burning odour. Turned off the aircon and put the air to 'fresh'. No overheating, no warning lights, and no difference noted in the engine performance. After about 10 mins, aircon functions normally. Have checked oil and water and everything is fine. Car was serviced just prior to road trip. There are not burn type marks under the bonnet, and the only external fluid I can find was a little around the top of the master cylinder reservoir. Could this have anything to do with the anti pollution emissions under high revs?

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I hear your problem but im afraid its not a problem in some ways. you see on hilly terrain the engine is going above it's settings. its called altitude control . when the engine is made its set to sea level. with the ecu. this is not a problem with cars that run all the time on flat and slight inclines the ecu can control the air and fuel for this also having the a/c on will lower the engine performance as it puts more strain on the engine. what you will need to do is have your ecu updated. 4x4 dont have this problem as they have the extra setting all ready set to the ecu. some have not been set on them if they come with road tyres. but you can have yours update, also this that can help are a clean air filter clean idle intake , also checking for air leaks on the intake manifold and air lines. fuel filter changed regularly. spark plug's checked or changed. and egr cleaned out regularly ( every 2 years). driving up and down hills put a lot of strain on the engine gears bearings in the drive wheels and dif. the update will help with the fuel to air ratio for the more power to navigate up hills. but regular checks need to be done to keep the rest of the car to be able to do the hills. the smoke you getting out of the vets is the engine over hot. list will make the exhaust manifold come away from the engine just a bit but enough to let some smoke out. its like revving the engine to its limit driving up a hill. eventually the bolts will weaken and snap then you will have a loud blowing sound from the exhaust. the cat should be able to cope with the heat as they work better with more heat. but unburnt fuel can damage the cat. hope this helps you.

Posted on Mar 24, 2014


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