Can someone tell me what a defective Vacuum pump sounds like? Would it make a clicking sound when the engine is at idle?
I thought at first it was the engine knocking as a result of bad gas (lower octane). But, I'm on my third tank and the noise / sound is still there.
It's not very noticeable when the engine is first started, but does get louder when the engine is hot....and, its only audible when the engine is at idle.
I also haven't really noticed any performance degradation, however, I have noticed some hesitation upon pulling away when stopped at a light.
Any ideas from those of you who are mechanically inclined?
Thanks,
Phil

I thought at first it was the engine knocking as a result of bad gas (lower octane). But, I'm on my third tank and the noise / sound is still there.
It's not very noticeable when the engine is first started, but does get louder when the engine is hot....and, its only audible when the engine is at idle.
I also haven't really noticed any performance degradation, however, I have noticed some hesitation upon pulling away when stopped at a light.
Any ideas from those of you who are mechanically inclined?
Thanks,
Phil