my 1999 nissan sentra with 111000 mi on it runs great in the morning when its cool but here in arizona when the afternoon temps are 100-115 the car seem to run rough
1999 nissan sentra 111000 mi car runs great in the morning but when the temps start to
reach 100 plus the car runs rough and seem to have fluctuation in power .Also i get a lot
of engine vibration
My first thought is oil. Make sure you're using high-mileage oil that will run well at high temperatures, such as 5w40. Another part to your question can be answered by explaining the atmospheric difference between cold and hot air. Cold air is more dense than hot air, which means there are more air particles in cold air. This means a vehicle (or anything that breathes air) will perform better in a cooler climate/time of day. This is why cold-air intakes are low to the ground and more effective than stock intakes. The trouble in your case is not completely solveable with engine parts. But a cold-air intake and high-mileage oil might help a little.
thank you for your help they have been using 30wt oil in it I will ask to upgrade to 5w40 next oil change which is in a few days
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