DIY : Seafoaming the 1990 Mercedes Benz 300 SEL

Add it slowly...

[@davidchristie3245]

I've owned an SEL - same year - for 15 years. I don't detect an abnormal start. It's quite normal to crank it a couple of times if that big engine has been sitting for awhile. Great cars.

[@garrettdodson6110]

You're crazy that's a terrible starting issue. My 89 560SEL never had that problem started strong every time. Even my 97 S500 starts beautiful every time.

[@ES89ES]

Your car looks stunning! Please take good care of this classic :)

[@JackpodyDK]

You can't compress a liquid, but in this case, you can burn it. It's not harmful for the engine unless you drown it.

[@AxCYeR]

i wish i had a w126 in that color. looks stunning

[@dillenmoonen4569]

Your starting problem is probably caused by the the OVP relay behind the battery that relay controls the cold start which injects more fuel into the engine to allow it to run richer. The cold start it triggered also by the coolant sensor that tells the ecu when the engines cold to add more fuel for starting. If the relay is shot or you have the older relay with only one fuse up top just go and buy the new style one with two fuses. If that doesn't do the trick then you'll probably should change the spark plugs and adjust the EHA below the air cleaner (its changes the fuel/air ratio). Check some forms and research it and stop pouring crap into your engine.

[@khurrammehtabdin6484]

Hi Dillen Changed the plugs and wires prior to this. Thanks.

[@dmills837]

My 1990 W126 used to do the same thing. Even after new fuel filter replacement and SeaFoam treatment, it continued w/ a hard start. The culprit is the fuel pressure accumulator.

[@SWF1127]

Not sure pouring liquid over a fresh outta the box a/c would have been my first choice of application but each to his own...A half a dozen things I would have done prior before going this route and they are all pretty much mentioned here..When was your coil last changed? Did you check the fuse on the OHV? A few things learned the hard way...

[@BDenes24]

FUNNYman1808 yes you can, i recently did mine. Mine was really bad so i went with the most intensive cleaning. full can in the gas tank half in the oil and half in the air intake. I really wish i had recorded it because i created a fog bank.

[@Nightbird.]

I guess the fog bank created only happens when you put it in the air intake..because I put a whole can in my oil crankcase and another in my fuel tank (500SEL) and only a small amount of white smoke came out. I did the Sea Foam treatment because there was this weird motor shaking/hesitation going on after driving it a few minutes..so I hope this works..as I'm doing it right at this moment and am letting my car sit with the motor running for about 45 minutes. Wish me luck! =)

[@garrettdodson6110]

Also when you seafoam from then intake someone should be sitting in the at keeping rpm around 2500 to keep it from dying.

[@kalef1234]

wow! great car. I have a 300E 1990 with 223,000 miles on it. haha still running strong.

[@gregagnew9777]

It's not a diesel, no need to wait for glow plugs to warm up.

[@jacobjames1171]

Maybe he was waiting for fuel pump to pressurize the system before he tried to start it.

[@VilleVallaton76]

In these cars, yes you do have to wait a little, K and KE jetronic has a pressurizing sequence when you put the current on, the key travel/spin is designed so that you need to take a new grip from the key after putting the current, which should allow this to happen. When an such an old injection system (slightly leaking injectors etc) has been standing a while, you might want to put the current on twice in order to enable a nice start.

[@Cougar111469]

As a professional auto repair technician with 20+ years experience, I'm somewhat skeptical about any of these automotive "snake oil" treatments. For the most most part, all I do is use high-quality, name-brand premium detergent gasoline with an occasional dash of Chevron Techron additive. I also use synthetic oil and change it religiously every 6K to 7K miles. Nice Benz, though. I just picked up a similar vehicle from a tow yard lien sale a month ago for only $500. It's complete, runs, burns no oil, and doesn't leak or make any funny noises, even at 365K miles.

[@tarantism]

i love these old mercedes in black

[@mrkongsimr]

So tell me do you still have the car > How has it been ???? I hope you still have it , it's beautiful .

[@stimpy451]

OVP relay. Check the fuse in it, it's between the firewall and bulkhead with a clear cover and a blade fuse underneath.

[@garrettdodson6110]

Shoot it could have even been bad cam shaft sensor bad crankshaft sensor or even distributor cap

[@mrkongsimr]

Hey I see you have an E class also , what do you know about there early years ? what is yours ? How is it ? Your sel is beautiful

[@carconnoisseur4615]

Cant wait to get my 560sel will upload when I do!

[@بيترسميث]

شغل السيارة على طول مع سماع الصافرة هذا الغرض من الصافرة هو وقت التشغيل وصوت المكينة صار ناعم بعد اتنضيف اول ما شغلها ازعاج تسمعونة وبعدها صارت سيارة فعلا صوتها ناعم ومختفى

[@soybeledward3]

the airfilter was still good just because it has a little dirt on it doesnt mean its bad your new one will get dirty in 2 weeks

[@reagentism]

Shouldn't you put that in the fuel tank??? All you are doing there is cleaning the intake, combustion chamber and maybe a little in the exhaust ports.

[@lmo96]

Hello my friend. I have a Mercedes car size 250 in 1985 I could not, God willing, set up the engine work, it produces black smoke and fuel is spent madly Fargo and I thank you very much

[@richardbifulco4379]

this a perfect video showing how a little bit of knowlege can be dangerous.....THE FUEL SYS IS NOT MAINTAING FUEL PRESSURE AT REST....... THE CK VALVE BY THE FUEL PUMPS BAD FUEL DISTRIBUTOR BAD INJECTORS FUEL LEAK

[@garrettdodson6110]

It's not starting like that is good indication of a faulty fuel pressure regulator.

[@atos.nympha3451]

Thanks for this video

[@jacobjames1171]

That's a nice ol car.

[@johnnybegood5783]

I got a 420 sel ruf idel should I clean mass air flow sensor and throdl body??as well as see fowm

[@الرميضيوسف]

أرقى وأحسن سارة في العالم المارسدس

[@BlueEyes1159]

Hi I have a 1990 300SE and im having problems with the alarm going off just like yours when i turn the car on I bought my car in the street it didn't come with a remote I went to Mercedes benz dealer and they said the 1990 dosent come with a remote do you have a remote for yours? or do you know where I can find one?

[@khurrammehtabdin6484]

Hey Adan If the alarm is going off when you start it--->unlock the car from the passenger door that disengages the alarm. Hope that helps.

[@ram457moreno]

hi Adam Hernandez... I have a 1989 300SE and when I hope the door with out waiting for the doors to unlock the alarm will go off... so I relock it and then wait till all the door are unlock ... that will disable the alarm ... if your alarm is going off when you start it... you need to make sure your have all your doors unlock.. or it will go off

[@6KHwy]

Do you know if this will work on a 560sec?

[@mrkongsimr]

I see the oil pressure looks high , at least when cold , but it varies allot .Some have high and some low miles have low or like in the middle . Do you know about this? Does this car give you allot of problems ?

[@stevendcruze7395]

My 91 W124 260E starts EXACTLY like this, did you ever cure the problem? its the M103 engine

[@harrynj22]

i just got my first benz lots of problems its a 89 430 sel

[@garrettdodson6110]

You mean 420SEL

[@harrynj22]

Ya sorry it was a typo and late reply

[@aa2398a]

what kind of issues

[@ArturAMG]

Good video :) Nice w126 :)

[@kalef1234]

is there a reason you waited for the buzzer to stop before starting? I never do that often. Are you supposed to?

[@Nightbird.]

I never wait for mine to stop..doesn't hurt anything. =)

[@Ethan__900]

Nightbird On most car is does not matter. On old Mercedes diesels the buzzing is the glow plugs heating up and if you start with the glow plugs cold it will run rough or not start at all.

[@Nightbird.]

Ethan Bowman I didn't know that..thanks for the info. Mine is a regular gas, grey market 500SEL..and I wish there was a way to disconnect the buzzer because it is annoying as hell..lol.

[@dirtball_official]

Ethan Bowman Nope! The buzzing is the driver's seat belt that isn't buckled. The timer is almost the same as the glow plug timer so I can see why a correlation could be assumed. The buzzer is a little box under the dash that can be unplugged and tossed if you like. I keep mine only because I occasionally forget to turn off the headlights and it warns you of that too.

[@Nightbird.]

I just Sea Foamed my '85 500SEL to see if it can help with this weird thumping vibration it gets when driven. It almost feels like the engine vibration you get when you put the wrong gas in (someone did that to mine one time years ago and it felt like my engine was going to fall out due to the violent spams it was having) but it's much milder than that..but still noticeable. Any ideas what this could be?

[@cskabos]

seafoming not gonna solve your problem. many small things can cause hard start and rough running. better get serviced properly if you want to use the car for another 20 years. I use a 89 w124 still 99% factory shape. 150k km.

[@MultiDreamer1979]

Dude you need to put that bottle in the gas tank bro that is not the bottle that goes in to intake...you can hydrolock your engine like that!!

[@hausmeisterengineering5952]

bro you can't clean the injection system by dumping seafoam in the air intake. you are bypassing the injection altogether.

[@delroyengel9799]

was it a rough start every time before or only when the engine was cold?

[@davejohnson3860]

That's a big hoola hoop!! S rocks.

[@benzlover55]

72k miles? Lucky....

[@carconnoisseur4615]

My favorite car and not that anyone cares but this was published on the day and year my daughter was born Must mean something lol jk

[@mazye01]

やはりW126がベンツって感じがするね＾＾私個人的に大好きな型＾＾

[@talharaza9794]

Where is the battery located?

[@JackpodyDK]

It's law in the US.

[@maxmiddleton7427]

waste of time, likely a fuel delivery issue find someone familiar with CIS.

[@محمدصالح-د7ف]

روعة

[@soybeledward3]

also your batter may be low

[@Blingdaa86]

WHY DO YOU HAVE THAT BUZZER IN THOSE CARS!!!??? I COULDN'T STAND THAT NOICE!! Nice car by the way.

[@kald201325]

ي لبى

[@kipwilliam5593]

He fucked his engine up

[@richardbifulco4379]

FUEL INJECTOR TREATMENT GOES IN THE FUEL TANK........ DO NOT DO WHAT HE IS DOING ON OF THE LAWS OF PHYSICS IS ,,,,,YOU CANNOT COMPRESS A LIQUOD.YOU WILL BEND SOMETHING INTERNALLY AND PERMANENTLY DAMAGE YOUR ENGINE.

[@kipwilliam5593]

He fucked his engine up, not a good idea

[@i_br_a5018]

الخليجي موصفات احسن من كذا معي واحد

[@lbowsk]

Sell it to MEEEEEE. Please.

[@kobebryanthashops]

sik

[@richardbifulco4379]

learn how to start a car......omg

[@edgesam4958]

You have nothing idea about the MERCEDES

[@AlonSOAMAZING]

Edge Sam well he’s at least trying

[@sukhmaidickoff]

That´s a biiiiiiiiiiiiiiiiiiiiiiiiiiiiiig air filter hehehe ;-)