Vacuum Sound on Stat Up only

[guitarman1996]

Hey guys, for the past 2 days whenever I start my 05 DC SR5 after it's been sitting for a while I hear a sound coming from the engine area that sounds just like a shop vac... It only lasts for 2 min and then it goes away..... I don't have any loss of performance or AC cooling. My temp gauge is staying just where it should.. It's driving nuts because it just started so I know it's not normal.... Any ideas?

[BaussConneryRocketII]

Im having this exact same problem on my 06. It just started this morning. All I have found online are people's opinions saying its an alternator bearing or something of the sort. OR "it's completely normal." Which I know it's not because my check engine light is on now. I plan on taking it to a shop around the corner that does free estimates and he has worked on my tundy before. I will let you know if I find out anything

[guitarman1996]

Yeah, it's really really weird but I found the answer... It's the Secondary Air Injection Pump... or A.I.P. Problem for us, is it's not easy to get to.... Sounds like yours is worse than mine though cause mine is not throwing a code..... Sadly this pump alone is like 900.00!! Let alone the price to have someone put it in!!! But in any case, let me know what you find out....