Engine bay gone wild?
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Joined: Dec 2015
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From: USA
2021 GLS580
Engine bay gone wild?
Y’all... So I’ve had the oil cooler leak for a while and I’ve just decided to take action and I have parts on the way. I’ve just discovered that my belt is shredded and something in the engine bay is smoking. When I checked it out I pulled out all of the remains of the belt and I have a replacement belt on the way. When the engine speeds reach 1500 I hear a loud wooshing sound as if the A/C is set to max!! I popped the hood and when I press the throttle there’s this ticking sound... What the hell is going on? Any thoughts?
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'08 GL 320 CDI
Probably way too hard to diagnose over a forum given the limited info. But I'll take a stab at the whooshing - my first guess would be a loose turbo hose - you're hearing the compressed air escaping.
Ticking sound - find the location of where it's emanating from.
What caused the belt to shred? It's a pretty rare thing, nowadays, for them to spontaneously combust. There's usually a reason. Gotta find that reason or it will happen again. Check all pulleys for abnormal wear... frozen... out of align, etc.
Ticking sound - find the location of where it's emanating from.
What caused the belt to shred? It's a pretty rare thing, nowadays, for them to spontaneously combust. There's usually a reason. Gotta find that reason or it will happen again. Check all pulleys for abnormal wear... frozen... out of align, etc.
Thread Starter
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Joined: Dec 2015
Posts: 163
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From: USA
2021 GLS580
Probably way too hard to diagnose over a forum given the limited info. But I'll take a stab at the whooshing - my first guess would be a loose turbo hose - you're hearing the compressed air escaping.
Ticking sound - find the location of where it's emanating from.
What caused the belt to shred? It's a pretty rare thing, nowadays, for them to spontaneously combust. There's usually a reason. Gotta find that reason or it will happen again. Check all pulleys for abnormal wear... frozen... out of align, etc.
Ticking sound - find the location of where it's emanating from.
What caused the belt to shred? It's a pretty rare thing, nowadays, for them to spontaneously combust. There's usually a reason. Gotta find that reason or it will happen again. Check all pulleys for abnormal wear... frozen... out of align, etc.
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'08 GL 320 CDI
Pulley's - nothing too hard or crazy here. Just get up close and personal and play with them - you'll know it when you see it (see ideas in my first post). Compare to the other pulleys.
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2021 GLS580
Ah, OK... now see, that's more info! So if the whooshing started just after maintenance that you did, then the first thing to do is to retrace your steps and check every connection/seal... including anything on the compression side of the turbo.
Pulley's - nothing too hard or crazy here. Just get up close and personal and play with them - you'll know it when you see it (see ideas in my first post). Compare to the other pulleys.
Pulley's - nothing too hard or crazy here. Just get up close and personal and play with them - you'll know it when you see it (see ideas in my first post). Compare to the other pulleys.
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'08 GL 320 CDI
Just because you haven't touched it, though, doesn't mean something couldn't have happened to that pipe. You could very well be right, though - as I mentioned, I can only suggest a possibility based on the info here. It's just that "whooshing", to me, sounds exactly like what happens when a turbo hose lets go.
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2021 V167
The wooshing sound you hear is the intake air temperature sensor that was knocked out by the belt. The sensor resides under the throttle body and will be hanging by the plug and harness. I know this as I have seen it twice. If you leave it like that it will throw a error code.
When it did it to me the first time it broke the tab that held the sensor in, thus requiring a new sensor.
When it did it to me the first time it broke the tab that held the sensor in, thus requiring a new sensor.
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From: USA
2021 GLS580
Thanks guys for the input! I’m gonna check out the temperature sensor tomorrow morning to see if it’s what you described. The belt slipped and is shredded. Luckily, it only happened in my neighborhood. I’m getting a replacement belt tomorrow, I had one on the way because I predicted that this was gonna happen soon, but it happened sooner than I expected.
Pulleys seem to be fine to me though, so I’m assuming it’s all the oil that made it slip. There’s oil EVERYWHERE. It’s so bad. I’m tackling this job as soon as the parts come in.
Pulleys seem to be fine to me though, so I’m assuming it’s all the oil that made it slip. There’s oil EVERYWHERE. It’s so bad. I’m tackling this job as soon as the parts come in.
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Thread Starter
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From: USA
2021 GLS580
The wooshing sound you hear is the intake air temperature sensor that was knocked out by the belt. The sensor resides under the throttle body and will be hanging by the plug and harness. I know this as I have seen it twice. If you leave it like that it will throw a error code.
When it did it to me the first time it broke the tab that held the sensor in, thus requiring a new sensor.
When it did it to me the first time it broke the tab that held the sensor in, thus requiring a new sensor.
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2021 GLS580
Belt replaced and wooshing sound is still there and there is a lot of exhaust smoke on acceleration! I checked the intake sensor (p/n a0061539928) and it’s still in place. Took of the turbo intake pipe and inspected, good as new. Started the engine and monitored the turbo. All good. I’m confused as hell. What else could it be?
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2021 V167
trouble code
If there is a significant charge air pressure leak it should be throwing a trouble code. Is your check engine light on?
Where did all of the oil come from? the charge air lines and intercooler all have some oil in them (normal). Do you have a oil filter housing leak?
Where did all of the oil come from? the charge air lines and intercooler all have some oil in them (normal). Do you have a oil filter housing leak?
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From: Allentown, PA
'08 GL 320 CDI
Try in neutral, first, to see if you get lucky.
Edit... maybe it would be safer to try in reverse than in drive.
Oh... I'm not sure exactly what is responsible for controlling the amount of boost into the engine - see if you can research that - possibly that has failed? Or, depending on what it is, was disconnected during your recent maintenance by mistake? Although, I would think you would get a code if an electrical device was disconnected.
Last edited by DennisG01; Mar 19, 2019 at 08:44 PM.
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2021 GLS580
Yes! My friend heard it coming from like the LEFT (passenger side) of the engine. I checked the manifold sensor and it looked to be in the correct spot and unbothered. I checked the plastic air hoses connecting to the air filters all OK as well. With the belt being replaced the steering is starting to feel tight again.
If it matters, I believe I need to change some tie rods because there’s a loud clunking noise in my steering column.
If it matters, I believe I need to change some tie rods because there’s a loud clunking noise in my steering column.
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2021 GLS580
I was looking at another forum and p/n 6511530028 was also a culprit. I’ll check that out in a few and will update. I think this was the actual sensor the other member was talking about. I don’t know where it’s located though.
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UPDATE
The Temp sensor (p/n 6511530028) is missing!!! I had no idea where the throttle body was until I took off the air intake resonator (p/n a6421400087) and found the throttle body then i put my finger in the back of the unit and found a dime sized hole.. Pointed a flashlight in there and saw light shining through the throttle body.
I’ll order and replace the sensor and update. Thanks everyone for the help!
I’ll order and replace the sensor and update. Thanks everyone for the help!
Last edited by qxron; Mar 20, 2019 at 05:19 AM.
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'08 GL 320 CDI
There you go - you found the hole in the turbo system! But, I'm confused - up above you said you checked the intake temp sensor and it was good... then you checked again and it was missing (as Krusty originally suggested). Are you sure?
FYI... in the future, start out with as much detail of the issue as you can - it will make things easier for us.
Glad you got it sorted, though.
FYI... in the future, start out with as much detail of the issue as you can - it will make things easier for us.
Glad you got it sorted, though.
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2021 GLS580
I will explain more thoroughly next time. It was all scrambled because I was frustrated initially.
But yeah, there’s more than one intake sensor near the throttle body. The one I assumed, because it was the first one I saw (p/n a0061539928). It was actually the pressure sensor. When I removed the intake resonator I physically saw the throttle body through that hole and so I started feeling around the back of the throttle body area and found the hole where the temperature sensor (p/n 6511530028) actually goes. Shined a flashlight through that hole, saw the light through resonator hole.
But yeah, there’s more than one intake sensor near the throttle body. The one I assumed, because it was the first one I saw (p/n a0061539928). It was actually the pressure sensor. When I removed the intake resonator I physically saw the throttle body through that hole and so I started feeling around the back of the throttle body area and found the hole where the temperature sensor (p/n 6511530028) actually goes. Shined a flashlight through that hole, saw the light through resonator hole.
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2021 V167
No Trouble code?
I am amazed that it is not throwing a code. From my experience the 1/4" size hole where the sensor goes if left open for a couple of acceleration cycles will throw a charge air leak code. In any case can you find the plug that goes on the sensor? Hopefully it did not rip the harness. On these engines when the belt comes off or breaks it takes this sensor right out.
Luckily the sensor is around 27 bucks..
Luckily the sensor is around 27 bucks..
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2021 GLS580
UPDATE
Just installed the new sensor! Found the old one. It was knocked out for sure and the latch that held it in was broken. It was still attached to the harness and the harness was still good to go, luckily!
