if anyone can help it would be great. i have a 85 500sec and the car will not idle and it also hesitates when you try to pedal up for power ,if you gradually pedal up i can get full throttle but the car will not idle, a note this car sat for awhile so i thought the gas was bad i pulled the fuel pump ,filter and cleaned them out, i also took the fuel dist off and cleaned it up the piston moves freely, i took out the injectors cleaned them up as well as the fuel lines i seem to also have a similar problem with my 924 porshe they both have this **** mechanical fuel injection any help would be great, also does anyone know of the procedure to swap out the m/b motor for a chevy 350 i heard of this and might be intererested in a posible swap if i continue to have fuel issues thanks in advance

does seem to sound like a fuel issue

Do a search
been a few threads discussing this lately

560sel won't idle well

500SEC Fuel system problem

Think its the CIS K injection
I got it too
darn things are not great hot starters

Mine starts fine if its cold & it sat but least it runs
Good luck

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83 500 SEC Euro 198K

Actually the fuel injection system on that car is very very simple and reliable. it also lasts about forever. no system will work if it is gummed up with bad fuel.

if you get it working right it will give a long reliable service life.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Thanks

I was getting a bit concerned
as mine is a 82/83
Don't expect it to be the best in the world
but would like it work reliably

Good to know
I was hoping I didn't get a really bad fuel system
I am aware they have hot starting issues
inherent in them
even the manual has a note you may have to press accelerator ro start do a hot start...

Sometimes simple is better
less computer/electrical control

Good ole benz
Hope I get mine happy & it lasts almost forever

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83 500 SEC Euro 198K

I would check the simple stuff first such as fuel pumps, vacuum leaks. Then do the more harder stuff such as testing the electrical components such as the wiring harness and sensors, components of your fuel system. Between that you should be able to find it.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

just wondering round the engine
reading threads
crossing my fingers
hoping I find it...
Thanks,

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83 500 SEC Euro 198K

If you need diagrams let me know via pm and I can send you some. I would need your vin# and email addy so i could them to you.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

CS,
Have you added any fuel to the cars tank yet, you dont seem to drive it much?
I think something you really need to do is drive that tank empty and then fill up and add a bottle of Techron synthetic fuel system cleaner to the tank and drive it some more. I know you talk about not dirveing much and not getting out and being afraid it will leave you on the raod. Guess what, any one of our cars can leave us on the road. Get it out and drive it, anywhere. Just drive it, for a while. A long while and let it eat that tank of gas. Maybe even put a fuel system cleaner in now and drive it. By the expensive fuel system cleaner too, synthetic is nice, MB likes Techron if you can find it. Get a good drive and put a new tank of gas in and more cleaner with the fuel. Not recommended all that often but this car has sat for a time and it needs the carbon and gum cleaned out of it, WHo knows, the high idle issue may just go away if you have something sticking and it gets cleaned out. It has happened lots of times before...

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red

When I got it had about 1/4 tank
I filled up with the corner Chevron Techron took about 16 gal
I've driven about 60 miles & used about 1/4 tamk


The techron is a fuel cleaner?
Does the gas station sell it?

B\Not sure about those things
though

I do want to get some of those things done before I did serious driving
I'm a chicken & inexperienced highway driver...



Well my birthday is Sunday
So maybe its time
with my vacumn hose repair the new radiator cap, radiator & thermo
Maybe its time to see what she can do?

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83 500 SEC Euro 198K

See CS, Here is the deal...You have nothing to lose...You have AAA and the MB road side service if ANYTHING happens. Also, you have done several things that should make it run better and nothing you have found indicates an iminent failure of any parts. It can happen at any time and there is not real "time" to feel it is ready to drive. Just a "time" to know it is not ready to drive. It is not smoking, it is not making any "bad" noises, and it is not leaking any fluids to speak of. GO for a drive on your Birthday! Stay off the major roads or highway, but drive it! Use up the gas and while you are out, find an Autozone or Advance Auto or even a Wal Mart and go in and brag about the car and then go buy a couple bottles of fuel system cleaner that you add to your fuel tank when you fll it up. It will clean the injectors, the throttle body, the parts you cant see or get to, I know you like the sounds of that, clean...
Techtron is one of my favorites and it is a synthetic addative and Many MB mechs recommend it. It is a good total cleaner. Black bottle with a red white and blue logo near the top. Shaped like a round cylinder with a tapered top that comes to a small point. Not hard to find. If you cant find that brand, just get what looks good and buy something that is not the cheapest , but not the most expensive, I like the mid cost cleaners. $4-8 dollars a piece. Dump it int he tank at teh gas station and then fill the tank at least half full. can put one in without a fill up, but it doesnt mix as well unless you go for a drive afterwards, But that is the main thing I WANT you to go do. The car will thank you, even if you need to call AAA for something silly that might occur, the engine needs to be run for you to know if the things you dont like about it are from old gas and dirty injector system and sitting for 2 years or if it is really something to focus your attention on.
Happy Birthday and have fun. DRIVE!

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red

Since the fuel system sounds good, I would tend to lean more toward the Idle Speed Control Valve (slide valve) and/or the Idle Speed Control Unit. When mine went bad, the car ran fine at highway speeds, but pull up to a stop sign/light and it would die.

Also, awhle back I was swapping out the control unit just to see if mine was bad. I put a bad one in and revved the engine. After letting up on the accelerator it died immediately.

If you are unaware of the locations, the slide valve is silver and on the front top of the engine. It sets between the distributor and Warm Up Regulator (if you have the latter) and has two wires going into the front of it. The control unit is under the dash and probably behind the glove box liner.

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Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000

I guess you're right
Truthfully the car is only half on the equation
the driver is a it intimidated by it but I really want to get it in motion
would be good for us both!



Oooh mission one
Find some of that Techron cleaner
I have has a hard start but got it on 2 or 3 tries

It has mostly fresh gas
I added 16 1/2 gal Chevron Techron when I got it it was at 1/4 tank
so it has basically 6 or so old in it

I don't feel a fast idle would result from dirty things
as that would seem to slow it?

Anyway time to make coffee & take a drive...

Have a great day

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83 500 SEC Euro 198K

High idle is likely same cause different symptom:
IE high idle can be due to dirty ICV, vac lines old and cracked, throttle body dirty, etc Engine and computer likey trying to compensate for something else that has set and is not operating up to standard. Hard start could easily be caused by bad or dirty injector as a result of sitting for a time. Also, the cold start valve, which is really another fuel injector that injects directlyin to the intake for fast start when cold could aslo either be dirty, bad, or leaking. SO, many of the things that you are annoyed about could be from lack of use and varnish or gum accumulating or just being dirty from use and age and sitting undriven. See why it could benefit from a long highway speed drive, it heats things up, burns of bad gas and blockages and gummed up injector system. You might find something fixed after the drive and if you dont, it was still fun.
Note: Cheveron Techtron gas has a small amount of the same cleaner Techron, that I want you to buy and use periodically in your fuel tank, say at least once a year or twice, you dont drive it much, I have done it as often as every 3 months in my 16v with no negitive results, only a fast clean, nicely handling engine.
PS - My pride and joy, 1986 2.3-16v doesnt always start right up on the first key turn either and I paid a bit over 3 times what you paid for your new baby to get this one is such good condition from Florida, big deal. I could be an endless search to finally get all the possible reasons sorted out to get it to guarantee it starts on the first turn. Who cares, it is running well, all else is within specs, valves set correctly and babied with tons of new parts casue I like to turn wrenches. Just drive it.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red

I just took my 380SE from Acton to Valencia MB to get the correct spark plugs and wiper blade refills. Got the plugs and they only had One refill, luckily my passenger side wiper is like new. I need to buy the vacuum hose between the engine and the brake booster. $54.00 from MB and they would have to order it. I waited on that. Car did something in Valencia that scared the bejeebers out of me. It would not shift into second or third, range from a stoplight. just reved up. I was close to the MD dealer(didn't even think of the MB roadside assistance) and by the next turn it seemed fine. Parked in the dealership lot and went in and bought my parts.(boy you spend some bucks on the googahs, clothes, model cars, and widgets on the wall). I got back in the car and it didn't start right up like usual, but I helped it and then it started and idled fine(this might be cleaning up on it's own). I did fill the tank with premium and dumped in a can of cleaner($6.00 range). I didn't have any problem with the car all the way back up the mountain home. That tranny thing scared me. I thought I lost the tranny right there. Tells me I need to drain the tranny and replace the filter.
anyone else experience the tranny not shifting and the engine just revving up?? SCAREY!
But she didn't do it again, and she made it up the mountain with no problems.
Car didn't get above 85C the whole trip.

I will give it Chevron no problem gas station is 2 blocks away so its the closest...

Thanks will work on more vac hoses when I can peel back the ignition wires away
Not touching them til I have new
rubber connection on dius boots is old I can see one cracked

Like to find that icv & clean it
think its about a $100 part can't remember

Oh it starts cold like a champ even after days
right up fast & strong almost immediate
Never had a car start like it does

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83 500 SEC Euro 198K