Question

1. if a winter - grade gasoline is used in warm weather all the following are possible except?

a. rough idle
b. stalling
c. hesitation on acceleration
d. hard starting

Explanation:

Step1: Analyze winter - grade gasoline in warm weather

Winter - grade gasoline has a lower volatility. In warm weather, it may vaporize too much.

Step2: Check each option

• Option a: Rough idle can occur as the fuel - air mixture is affected.
• Option b: Stalling can happen due to improper fuel - air ratio.
• Option c: Hesitation on acceleration may be because of incorrect fuel delivery (due to vaporization issues).
• Option d: Hard starting is more likely when gasoline is too volatile (e.g., summer - grade in cold weather). Since winter - grade is less volatile, hard starting is not a result of using it in warm weather.

Answer:

d. Hard starting