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Old 09-16-2013, 01:16 PM
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Air flow problem

Hey guys, this is my first post here but I've been around for a year or so getting myself educated with all the great knowledge on this site. So first off, thanks to you all for all the help you've already given me. I've been able to do all sorts of things on my truck that I would have never before tried to tackle.

I am having a problem though that I just can't figure out. When pulling a grade and usually above 2000 RPM's I get a repetitive sucking sound coming from under the hood right on the driver's side. The truck loses some power and rpm's and then the sucking will stop but is sure to come right back again unless I let up on the throttle. When this happens my MAF reading goes from 135 to 75 or so.

Of course describing sounds with words is difficult but it sounds like she's starving for air kind of like if you try to breathe in through your mouth and block the flow with your tongue and then let just a bit of air in before closing it off again and again.

I recently had to have a new turbo put on. It was after this that the noise started occurring so this is the primary suspect but I'm not sure what could be wrong.

Thanks in advance for any thoughts,

Ryan in AK
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Old 09-16-2013, 02:05 PM
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You may have sucked a rag or plastic bag into the air filter partialy blocking air flow.
Have actually found that a few times.
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Old 09-16-2013, 02:11 PM
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The turbo installer didn't leave something in the intake did they???? Just a thought since you said it's happening after the turbo install.
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Old 11-06-2013, 01:39 PM
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Talking Problem solved

Problem solved thanks to Medic969's thread (link below) where he caught his truck's noise on video. It was exactly the same noise my truck was making. Brand new turbo solved the problem....luckily it was still under warranty.

thoughts to what is making this noise?
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