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  #1  
Old 12-03-2008, 08:51 PM
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82 mb 380sec starting proablem

well i have the 1982 mb 380sec
in the morninig it starts okaythen i go to school about 20 miles ,,i get there i turn engine off,,and if i come in about 30-40 minutes the car does not want to start anymore from the first try ,,like half key when is turned! and i try the secound time ,,and the engine turns about 10-15 times intill it starts,,and at first runs rughf intill i press the gas pedal feww times then comebacks to normal,,
what the proablem,may be?,when the engine is cold starts okay,,when is hot starts hard?,,

thanks

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1982 mercedes-benz 380sec-v8
1983 merceds-benz 280se-euro-straight 6 (for sale)
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  #2  
Old 12-04-2008, 09:30 AM
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Most likely fuel pressure bleed-off.
Common issue on CIS cars. Fuel pump check valve, fuel pressure accumulator, or fuel pressure regulator o-ring are the most common problems.

OF course the secondary ignition MUST be in good condition!
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  #3  
Old 12-04-2008, 10:38 AM
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what do you mean " OF course the secondary ignition MUST be in good condition!""

thanks
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1982 mercedes-benz 380sec-v8
1983 merceds-benz 280se-euro-straight 6 (for sale)
http://i34.tinypic.com/15iaydg.jpg
http://i34.tinypic.com/2rzxhc7.jpg
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  #4  
Old 12-04-2008, 12:22 PM
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Dist cap, rotor, wires, & coil.

Low secondary ignition voltage will cause hard starting with a HOT engine just like a lack of fuel.
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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  #5  
Old 12-04-2008, 07:23 PM
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Quote:
Originally Posted by M.B.DOC View Post
Dist cap, rotor, wires, & coil.

Low secondary ignition voltage will cause hard starting with a HOT engine just like a lack of fuel.
the low secoundary ign. is this one?
the black one from left?

thanks
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1982 mercedes-benz 380sec-v8
1983 merceds-benz 280se-euro-straight 6 (for sale)
http://i34.tinypic.com/15iaydg.jpg
http://i34.tinypic.com/2rzxhc7.jpg
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  #6  
Old 12-04-2008, 07:32 PM
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Quote:
Originally Posted by M.B.DOC View Post
Most likely fuel pressure bleed-off.
Common issue on CIS cars. Fuel pump check valve, fuel pressure accumulator, or fuel pressure regulator o-ring are the most common problems.

OF course the secondary ignition MUST be in good condition!
so the fuel pump check valve is it in here

fuel pressure accumulator



and the fuel pressure regulator o-ring ?




im trying to find out where all this are located
if can point me in the right direction
thanks
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1982 mercedes-benz 380sec-v8
1983 merceds-benz 280se-euro-straight 6 (for sale)
http://i34.tinypic.com/15iaydg.jpg
http://i34.tinypic.com/2rzxhc7.jpg
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  #7  
Old 12-06-2008, 01:50 AM
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Quote:
Originally Posted by M.B.DOC View Post
Dist cap, rotor, wires, & coil.

Low secondary ignition voltage will cause hard starting with a HOT engine just like a lack of fuel.
it should be this one the check valve



and
the pressure accumulator i dont know where this one is


and the pressure regulator ,i know that this is next to fuel distribuitor ,,i did check --a vacum test-- and it was fine

what o ring you talking about?,, because this is one pieces?

thanks
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1982 mercedes-benz 380sec-v8
1983 merceds-benz 280se-euro-straight 6 (for sale)
http://i34.tinypic.com/15iaydg.jpg
http://i34.tinypic.com/2rzxhc7.jpg
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  #8  
Old 12-06-2008, 06:44 AM
t walgamuth's Avatar
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Join Date: Apr 2005
Location: Lafayette Indiana
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When I first got my 500SEC I chased this problem for months, spending probably nearly a thou on parts and labor at my indie, changing dist cap, wires, plugs and other things.

One day I was griping about it to an older gent who had made his living working on benzes when this car was new, and he said....."always push the gas pedal down about half way on startup on those cars".

I did that and also developed the habit of never shutting the car off when going into the village pantry to get a news paper or such and lived happily ever after. It was bleeding fuel into the intake on shutoff and when you restarted it the fuel would make it run rich and stumble until you revved the engine up and blew it out.

I never fixed the problem but it never got worse either. I drove the car sixty thousand miles that way. It ran strongly and smoothly in every other way.
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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.
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  #9  
Old 12-06-2008, 10:51 AM
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Quote:
Originally Posted by t walgamuth View Post
When I first got my 500SEC I chased this problem for months, spending probably nearly a thou on parts and labor at my indie, changing dist cap, wires, plugs and other things.

One day I was griping about it to an older gent who had made his living working on benzes when this car was new, and he said....."always push the gas pedal down about half way on startup on those cars".

I did that and also developed the habit of never shutting the car off when going into the village pantry to get a news paper or such and lived happily ever after. It was bleeding fuel into the intake on shutoff and when you restarted it the fuel would make it run rich and stumble until you revved the engine up and blew it out.

I never fixed the problem but it never got worse either. I drove the car sixty thousand miles that way. It ran strongly and smoothly in every other way.
yes,i know,,but i cant live the car like that ,,because i need the smog to get my dmv sticker,,and it fail smog 3 times,,last time i took the car to one of my friend shop and he put it on a smog machine he adjusted to pass smog at 15 and 25 miles ,,but the proablem was ,if he took his foot of the gas padel the car will die,, will not stay at idle if he needs to go bellow to adjust the fuel mixture ,,so i just dont know man,im just changing some staff here in there,,im not working right now,,and money ,you know...
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1982 mercedes-benz 380sec-v8
1983 merceds-benz 280se-euro-straight 6 (for sale)
http://i34.tinypic.com/15iaydg.jpg
http://i34.tinypic.com/2rzxhc7.jpg
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  #10  
Old 12-06-2008, 04:21 PM
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Wur

Does it look like it has the original, or an old Warm Up Regulator? My original WUR on my 380 lasted 22 years and then it started to have warm start issues until I replaced it. I'm not saying that's your problem, but if soon, it becomes very hard to start when warm, I would suspect it to be faulty.

Ben
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  #11  
Old 12-06-2008, 05:01 PM
t walgamuth's Avatar
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Join Date: Apr 2005
Location: Lafayette Indiana
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We don't have emission checks in INdiana.
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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.
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  #12  
Old 12-09-2008, 03:06 PM
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well im in california,,and you can not get a way with out smoging the vechile here,,,

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1982 mercedes-benz 380sec-v8
1983 merceds-benz 280se-euro-straight 6 (for sale)
http://i34.tinypic.com/15iaydg.jpg
http://i34.tinypic.com/2rzxhc7.jpg
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