Groan aftet start
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Mountain Pass
Joined: Feb 2016
Posts: 150
Likes: 1
From: Los Angeles
Groan aftet start
update: figured out it was my AC clutch
What is this groan I am hearing? It is immediately after starting the engine. Normally there is a sucking or wooshing sound that is probably some emissions related jink, bit now it groans like a dying duck and for a longer period of time. It eventually stops and sometimes it is worse than others.
What is this groan I am hearing? It is immediately after starting the engine. Normally there is a sucking or wooshing sound that is probably some emissions related jink, bit now it groans like a dying duck and for a longer period of time. It eventually stops and sometimes it is worse than others.
Last edited by The Tiger; Sep 30, 2020 at 01:29 PM. Reason: Update
Laughing Gas
Joined: Dec 2017
Posts: 1,003
Likes: 644
From: Miami, Fl
What is this groan I am hearing? It is immediately after starting the engine. Normally there is a sucking or wooshing sound that is probably some emissions related jink, bit now it groans like a dying duck and for a longer period of time. It eventually stops and sometimes it is worse than others.
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Mountain Pass
Joined: Feb 2016
Posts: 150
Likes: 1
From: Los Angeles
I find it odd because it is getting louder and last longer than in the past. If I were to guess it is either vacuum or emissions related. I started getting concerned because it seems like it is getting worse.
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Mountain Pass
Joined: Feb 2016
Posts: 150
Likes: 1
From: Los Angeles
It only happens for a 1-3 seconds when I first start the engine. It doesn't sound like power steering
Fleet Mechanic
Joined: Mar 2019
Posts: 1,294
Likes: 164
Now that I think about it mine does the same thing. I think it is something with the vacuum canister or emissions canister up on the drivers inner fender. Mine does it even with the key on truck not running.
Thread Starter
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Mountain Pass
Joined: Feb 2016
Posts: 150
Likes: 1
From: Los Angeles
Yes, thats the sound I'm talking about. The sound is changing, I am thinking that means it is going out. It sounds terrible intermittently.
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FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
I can't for the life of me remember what it was now, but this was a common question way back...
Something in the heating/AC box? Not the blend door, but one of the other doors that are powered by vacuum. Vacuum leaking down? Got ESOF 4x4? There is a vacuum reservoir (and, I believe, a one-way valve in before it, so it should hold vacuum). It's on the passenger-side wheel well that is known to crack.
Something to check would be the brake booster. That elbow where the vacuum line attaches is actually a one-way valve. It will groan as the booster gets vacuum, and then stop when the vacuum evens out. Next time you go to start the truck after sitting overnight, see if the brake pedal is still soft, or it's very hard.
Something in the heating/AC box? Not the blend door, but one of the other doors that are powered by vacuum. Vacuum leaking down? Got ESOF 4x4? There is a vacuum reservoir (and, I believe, a one-way valve in before it, so it should hold vacuum). It's on the passenger-side wheel well that is known to crack.
Something to check would be the brake booster. That elbow where the vacuum line attaches is actually a one-way valve. It will groan as the booster gets vacuum, and then stop when the vacuum evens out. Next time you go to start the truck after sitting overnight, see if the brake pedal is still soft, or it's very hard.
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More Turbo
Joined: Aug 2014
Posts: 546
Likes: 30
From: VA- Shenandoah Valley
It's the fuel level needle...
My previous 04 did it every time at start up, manual shift transfer case. I never found a correlation to anything, and everything functioned accordingly. I don't think that my current 04 does it- I haven't really paid attention.
Because it is pretty common, it's probably something normal in the vacuum system.
My previous 04 did it every time at start up, manual shift transfer case. I never found a correlation to anything, and everything functioned accordingly. I don't think that my current 04 does it- I haven't really paid attention.
Because it is pretty common, it's probably something normal in the vacuum system.
Freshman User
Joined: Feb 2014
Posts: 28
Likes: 0
Same thing with mine. While troubleshooting a no start event (bad fuel pump), I noticed the same whosh a couple seconds after trying to start it. I guess it is just a bonus "feature". It is coming from that vac canister on the drivers side fender. No drivability problems after the fuel pump was replaced.
