#33 Fixing auxiliary air valve and idling problem Mercedes 107 450 SLC, D-JET

[@jin-suchoi2517]

What a gorgeous sound from this V8 4.5 liter engine. Oh my goodness...!!

[@Pexyz]

Yes, absolutely 👍 //Peter

[@tonyreyes9969]

So the problem was the auxiliary air valve was stuck wide open resulting into a very lean air and fuel mixture during warm-up phase. Job well done, your video was very clear. Thanks for posting.

[@Pexyz]

Well, I guess so. I'm not sure if this was the whole problem, but the car runs a lot better now. Thank you very very much for watching and commenting!

[@h-a-milli4531]

You have given me the courage and confidence to dismantle my air slide valve w109. Thanks

[@Pexyz]

Thanks for your nice comment H-A-Milli! I hope it turned out alright for you. Congrats to a very nice car, a W109!

[@h-a-milli4531]

@@Pexyz Hi Pexy, thank you. W109 is in bits at the moment and I am struggling slowly to put it together. Tell me is the air slide Valve supposed to close off completely on 3.5 v8

[@Pexyz]

@@h-a-milli4531 I'm not sure, sorry. Good luck with your project! Just take it piece by piece and you'll make it.

[@marcpollard8792]

Thanks for taking the time to make that high-quality video, I will take mine off because I’m having a similar problem on my 3.5 L V8 now, thanks again!

[@Pexyz]

Thanks Marc! Very nice to hear. Good luck with your project 👌👍 //Peter

[@brandonmullins7406]

You have no idea how helpful this video is. Ive been trying to figure out whats goin on with my 74 450se w116 for tooo long. Im gonna try this and hopefully it helps

[@Pexyz]

Thank you very much Brandon👌👍. I hope it will help on your car too. Good luck with your project! //Peter

[@jaxs2384]

I have a jag V12. Bosch D jetronic. The same parts and system Thanks for informative video

[@Pexyz]

Thank you very much for watching! 👌 //Peter

[@Amade1756]

OMG! THANK YOU SO MUCH FOR UPLOADING!!! We are having a similar issue with our 74 450SL!!!

[@Pexyz]

You're very welcome Amade 1756! Thank you so much for watching and for the nice comment! Good luck with the 450 SL. I hope it works out for you. /Peter

[@bearsrodshop7067]

Putting it in a pan of boiling water (120f /100c) for 8-10 mins. Try this next time, works without any damage to housing. Also works to dismatel seized older brake pistons.

[@Pexyz]

Thanks for watching and for your input, Bears Rod Shop! I actually tried the boiling method before dismantling and filming, but it didn't work in my case.

[@MetaldetectingFriesland]

Great instructional video! Glad to see you've solved the problem!

[@Pexyz]

Thanks Martin!

[@ronalddean3630]

Wow, that was nice, thanks for presenting. The sound of the V8 is like music. Your shop has a great set-up as well. So I am guessing that any parts like this that connect and need to move can get clogged with airborne stuff that eventually builds up on surfaces and have to be cleaned every so often. Yes? What is the equivalent of this valve in the 85 380SL and subsequent 560SL?

[@honguenloh4612]

Love the sound effect...so cute & interesting like watching those old silent cartoons...keep up the good work!:)

[@Pexyz]

Thanks again, I'm glad you like my work.

[@ejtomero7720]

Really appreciate this video! I´ve got 450SE w116 with same engine. The problemn ist that its very difficult to find certain parts for the engine. Everything needs to be fixed of its own. Please make more videos of this D-jet! Thanks!

[@Pexyz]

Thanks EJ Tomero! I'll try to do that. I hope it works out with your 450 SE. /Peter

[@honguenloh4612]

Love the new radio cover too...very nice!:)

[@Pexyz]

Thanks! I like it too. Big difference.

[@ronalddean3630]

@@Pexyz Yeah, I forgot that in my comment above. The cover looks great!

[@IGGICAFF]

Thank you my slc350 had the same problem

[@Pexyz]

Thanks, nice to hear 👍

[@sg5127]

Super job, did you fit a new gasket before you refitted the air slide valve? I didn't see, but they're easy to cut from gasket paper if you don't have one.

[@Pexyz]

Thanks! Yes I think I did 👍

[@anderssimonson1431]

Nice work! Looks so easy when you do it.

[@Pexyz]

Thanks Anders! Everything looks easy in a movie ;)

[@pasifsc]

Nice work. I had the same idling problem with my 1971 350SL M116 engine and D-jetronic. I took the easier way to solve the problem and put a plastic plug with 8 mm hole in it inside the upper rubber hose. And now it idles steady 800 rpm. Of course this would cause a problem when trying to idle car in winter temps but I only use it summer time so it is no issue for me. Maybe I´ll try your way to fix it properly later.

[@Pexyz]

Nice trick. I'm glad it worked for you! Thanks for watching 👍 //Peter

[@deboeier7283]

Excellent Job❤

[@Pexyz]

Thanks 👍😀

[@pitman4121]

Great Video, just bookmarked in my W108 folder. Is this the same removal/install procedure for the M117 in 1972 280se 4.5

[@Pexyz]

Thanks, nice to hear. Yes, the procedure should be the same as long as you have the D-Jetronic fuel injection 👍 Greetings //Peter

[@pitman4121]

@@Pexyz Thank you Peter.

[@krakluaroo]

Nice car!

[@Pexyz]

Thanks Kraklu!

[@20e_arhundradets_rav]

Nice and clear, once again!

[@Pexyz]

Thanks!

[@Danny-sy8xj]

Great 👍 video I love watching your videos. I have a duel Zenith carburetor and its high on idling. Would you happen to have any tips on fixing this issue? I have a 1970 250C Mercedes Benz.

[@Pexyz]

Thanks Danny, very nice to hear! I'm far from an expert on these carbs, but I know that the acc linkage can cause problems if axles joints and springs are seized or not mounted properly. Otherwise maybe you should check the nozzles. Greetings /Peter

[@annahopp]

Same issue as with the Jaguar XJ-S V12. Just more space in the engine compartment.

[@Pexyz]

Yes, I think many cars with D-jet can have the same problem 😀👍

[@user-ls8rl3mo8e]

Hi Pexyz, I have a 73 450 SLC. I think mine has a different fuel pump. Any idea? Thank for for you expertise

[@Pexyz]

Hi Luke and thank you very much for watching 👌. Your fuel pump might look different, but the function should be the same. Your car is quite early and the look of the pump may vary between model years or if it's been replaced sometime during the years. //Peter

[@fredricholst5362]

Mycket bra förevisat, 👌🏽

[@Pexyz]

Stort tack Fredrik! Roligt att höra 👍 //Peter

[@josehumbertocontrerascarri594]

Thanks a lot. I Could fix my car doing exactly what you did.

[@Pexyz]

Very nice to hear 👍

[@mikeparrysatwat]

Well done Sir

[@Pexyz]

Thanks Garyf 👍 //Peter

[@MetaldetectingFriesland]

Looking back at this video, I think this may be the problem that I'm having with my recently newly bought w116 280SE, after changing the injector seal rubbers, the intake manifold gaskets and some rubber hoses it still idles kind of the same like this, but it's performing great under load!

[@Pexyz]

Hi and thanks! Great if this can be helpful to you too. //Peter 👍

[@samuelrobbins7972]

Super helpful video. About to do this for my newly-acquired ‘78 450SLC. Where did you find that radio cover?

[@Pexyz]

Thank you very much Samuel 👍. I found the cover on Ebay.uk. Sometimes you're just lucky 😁. Godd luck with your new project //Peter

[@moeramz]

Thank you!

[@IanStacker]

thank you , great video

[@Pexyz]

Thanks!

[@FrancePhil44]

Great job !

[@Pexyz]

Thanks Phil!

[@comighiasi3683]

nicely done thank you i learned

[@Pexyz]

Thanks Comi Ghiasi!

[@lukalucin787]

Hi, im having problems with my 79 450 slc, car starts when hard on gas pedal, runs in the high rpm, dies immediately when i lift my foot off the gas pedal, wont start again unless you clean the spark plugs which get all wet

[@Pexyz]

Hard to say, but maybe you have problems with the cold start valve? Unfortunately I'm not very familiar with the injection system you have in your '79. K-Jet i think. Greetings //Peter

[@marcosortolani3639]

Thanks for the video and congratulations for the work! One question: I am renovating an MB D-jet 280SE 6 cyl, 1976, which had been idle for 20 years. It works very well, but it loses power on the way up, coming to a stop. I already changed, candles, cables, coil, exhaust and the problem persists. What can it be?

[@Pexyz]

Thanks for watching Marcos! Hard to say what the problem is on your car, but one idea in continuing the troubleshooting would be to connect a fuel pressure gauge to the feed line. That way you might be able to see if you lose pressure. Otherwise it may still be on the ignition side. /Peter

[@marcosortolani3639]

The idle pressure is 2 bar. It may be that on the way up the pressure drops. I will try to read the pressure gauge on the way up, to check if the pressure drops. Thanks!

[@armandorua-fernandez2681]

Great video 👍🏽👍🏽

[@Pexyz]

Thanks Armando! //Peter

[@pierre-charlesbeuclair9308]

Hy! I have the same issue but when the engine is cold. When it become hot the engine stop, it could the same mechanic failure then you?

[@Pexyz]

Hard to say what your problem could be. Maybe you should check the ignition coil and the injection pressure regulator. Greetings //Peter

[@pierre-charlesbeuclair9308]

@@Pexyz if you want, I can show you some video of the evolution of that issue?

[@Alexander-zf9ti]

This is huge thanks. My dad has one exactly like yours with the same problem. A Chevy mechanic said it might have been a valve problem, but I will try this first. Where do you get your filters from for oil and fuel?

[@Pexyz]

Thanks Alexander! Very very nice to hear. I guess you should be able to order the filters at some local parts store. Otherwise you can get them from your MB dealer. They're not very expensive. I usually buy my filters from a local parts store. Good luck with your project! /Peter

[@maazzafar9442]

Was it rough under driving too while it had a rough idle? I have a w126 500sel with the same issue. Car runs and idle rough with no power until it heats up fully. Car also has no catalytic converter delete, can that cause the issue?

[@Pexyz]

My car ran rough only when idling. I guess your 500 has a different engine and another ignition system than mine. Unfortunately I don't know enought about them to give you proper adivce. Thanks for watching and good luck with your car!

[@dragantrujic9392]

Bravo

[@Pexyz]

Thanks Dragan 😀👍

[@mariobistiak9580]

Jeg har nesten samen problem med mine w107 450 1974 d-jet. Jeg vil styrte også "trigger point"

[@Pexyz]

Thanks for watching Mario! Yes, I know the trigger point can be an issue too. We'll see if my problem returns.

[@user-ls8rl3mo8e]

Does anyone know where to find this part?

[@Pexyz]

Hi Luke, thanks for watching 👌 I'll check if the valve is available and let you know. //Peter 👍👍

[@Pexyz]

Hello again Luke. Unfortunately the valve is no longer available. You'll have to search for a good used one. Greetings //Peter

[@hardyathygesen7925]

Great love it!

[@Pexyz]

Thanks Hardy! Very nice to hear! /Peter

[@euc131]

Great video = saved yourself a few hundred dollars on the new part...

[@Pexyz]

Thank you very much! Yes it's always nice to manage to repair instead of buying new parts 👍

[@jndeprez4362]

The problem is the temperature sensor (the copper-coloured housing/inside), these things wear out with age.

[@Pexyz]

Thanks JN DEPREZ

[@tomzouzoulas3169]

Did u have to put in a new gasket?

[@Pexyz]

I used Permatex silicone sealant. Thanks for watching, Tom!

[@tomzouzoulas3169]

@@Pexyz Keep up the great video content. Really enjoy watching your videos from Canada

[@supersolex]

i think at first it runs high rpm on the chocke

[@Pexyz]

Yes it runs high on the cold start valve

[@MrFlyingguy]

Yes...l

[@Pexyz]

Thanks MrFlyingguy //Peter