This van I bought has a high pitched whine or whistle when driving around town. It occurs when you step on the gas. The faster the engine turns the more high pitch it becomes. When the foot comes off the gas it becomes louder but lower pitched for a second or two. At idle the noise isn't noticed and isn't heard at highway speeds. I'd like to know whether it's a noisy alternator or a vacuum leak? I was assuming it was the alternator but then it could be associated with the check engine light that came on once recently, showing code 0121.
Engine noise
May 06, 2007
3 Replies
The first thing I thought of was the alternator. I have an old Honda that's starting to do that. I can't think of how a vacuum leak could produce such a noise.
It might be exhaust noise. Exhaust whisling is unsual, but it can happen.
Make, model and year, please. Engine size would be good.
Ted
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required