Air Flow Meter Boot Leak??? - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 07-13-2019, 04:05 PM Thread Starter
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Question Air Flow Meter Boot Leak???

I can't get a break with this car. I dropped a 500 SEC engine in my 380SL and have been hitting snag after snag since I started the project. Was finally going to take it for a test drive today when it developed this LOUD vacuum leak. The thing sounds like a jet engine. There is no obvious source but the idle changes if I spray carb cleaner around the back of the engine. Does anyone know the symptoms of an air flow meter boot leak or how to test it? I think this is the problem I don't want to take it off if I don't have to.
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post #2 of 13 (permalink) Old 07-13-2019, 05:34 PM
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You might try building this smoke machine. I have tried a couple of other DIY ones but none produced smoke like this one appears to.
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post #3 of 13 (permalink) Old 07-13-2019, 06:38 PM Thread Starter
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You might try building this smoke machine. I have tried a couple of other DIY ones but none produced smoke like this one appears to. https://www.youtube.com/watch?v=EhNQiIRsCCk
That is COOL!!! I already have a bike pump and most of the other parts laying around the house. Harbor Freight were kind enough to open a store nearby last year so I'll go there and get a soldering tomorrow. Thanks!
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post #4 of 13 (permalink) Old 07-13-2019, 09:37 PM
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Hey Mirv, when you dropped the engine in did you get a new boot or are you using the old one?

If you got a new one, did you remember to get the new flange? You have to get the updated flanges or else you get a massive leak.
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post #5 of 13 (permalink) Old 07-14-2019, 03:32 AM Thread Starter
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Originally Posted by okyoureabeast View Post
Hey Mirv, when you dropped the engine in did you get a new boot or are you using the old one?

If you got a new one, did you remember to get the new flange? You have to get the updated flanges or else you get a massive leak.
The fuel system from the 500 engine was incomplete so I used the system that I had. Why would I need a new flange with a new boot? Because the old one will get bent talking it off?
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post #6 of 13 (permalink) Old 07-14-2019, 08:27 AM
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They changed the flange type. Updated it I believe so it will last longer.

I would look there.
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post #7 of 13 (permalink) Old 07-14-2019, 09:22 AM Thread Starter
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AutohausAZ says you need a new flange with their aftermarket boot. I'll call them and ask if it turns out I need one. If that's the case it would be a lot cheaper to but an OEM boot. Thanks for the tip.
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post #8 of 13 (permalink) Old 07-14-2019, 01:42 PM
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Did you replace the boot and not get the flange?

After market and OEM are both the new style and need the flange. Autohausaz will confirm it.

If you replaced the boot and used the older style flange, that's your issue. There's a thread in here where a guy learned that lesson the hardway.

Can you post a thread about your conversion mirv? I'm really interested in what you did as I'm not satisfied with my m116
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post #9 of 13 (permalink) Old 07-14-2019, 02:41 PM Thread Starter
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Originally Posted by okyoureabeast View Post
Did you replace the boot and not get the flange?

After market and OEM are both the new style and need the flange. Autohausaz will confirm it.

If you replaced the boot and used the older style flange, that's your issue. There's a thread in here where a guy learned that lesson the hardway.

Can you post a thread about your conversion mirv? I'm really interested in what you did as I'm not satisfied with my m116
I didn't replace the boot, It just sprung a leak yesterday (at least that's what I think the problem is). I just finished making the smoke machine from Rowdie's link. I'm going to let it dry for a couple of hours and then see what I find. I'm going to post a thread about the conversion once I get it sorted out. It wasn't difficult but it was a lot of work. It took a while because I only have time to work on it on weekends and then there were lots and lots of delays because as I was going along, I would find that I would have to order parts, like it looks like I'll be doing tomorrow. I was planning to be done with it a month ago, then found that I needed a Neutral Safety Switch. Then when I got that in I found that I need Valve Guide Oil Seals. Got those in and now I have to deal with this. I hope this is the end for a while and I can drive it next weekend.
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post #10 of 13 (permalink) Old 07-14-2019, 06:10 PM
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Originally Posted by Mirv View Post
I didn't replace the boot, It just sprung a leak yesterday (at least that's what I think the problem is). I just finished making the smoke machine from Rowdie's link. I'm going to let it dry for a couple of hours and then see what I find. I'm going to post a thread about the conversion once I get it sorted out. It wasn't difficult but it was a lot of work. It took a while because I only have time to work on it on weekends and then there were lots and lots of delays because as I was going along, I would find that I would have to order parts, like it looks like I'll be doing tomorrow. I was planning to be done with it a month ago, then found that I needed a Neutral Safety Switch. Then when I got that in I found that I need Valve Guide Oil Seals. Got those in and now I have to deal with this. I hope this is the end for a while and I can drive it next weekend.
What size jar did you use.? I have to go buy pickles.

I wonder if scented lamp oil will work. I think my late wife had some up in a cabinet. Vanilla smoke
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