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Have a 1975 450sl D jet.. I have a 1975 450sl D jet. Engine
I have a 1975 450sl D jet. Engine will fire and quits immediately. crimping the fuel return line after the dampener, the engine will start and run. Replaced the fuel pressure regulator. Starts and quits immediately. Tested old regulator with compressed air and vents to the tank at 35 psi which I understand is OK. Any suggestions? … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Have a 1975 mercedes-benz 450sl. The windshield wipers will
Have a 1975 mercedes-benz 450sl. The windshield wipers will not go into the park position and stay there. They will work on slow and fast. But when I hit the switch to turn them off they go to the par… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
10,838 satisfied customers
Alot of black smoke and rough running when idling but clears
Alot of black smoke and rough running when idling but clears up when reved up . 450sl 1975 … read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
1,374 satisfied customers
1988 450sl - engine idles way too high even after warming
1988 450sl - engine idles way too high even after warming up. Also, the engine lacks power. When the accelerator is pressed, power flattens out even at higher RPMs. … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
I want Marty to work with me JA: What is the model/year of
I want Marty to work with me JA: What is the model/year of your Mercedes? Customer: 1975 450sl JA: What year is your SL? Customer: 1975 JA: When was your last tune up? Customer: 12 months ago JA: Are … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
I am restoring a 1975 450sl, it has started great every time
I am restoring a 1975 450sl, it has started great every time I started it over the 3 years iof restoration, and now that I am completed, I started it for the first time in a year and it took right off… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1975 mercedes 450sl: shifting..high gear..3rd gear..the pedal, it
1975 mercedes 450sl when shifting to high gear, you have to let off the gas, and it shifts good, but you have to let off the gas for it to shift into 3rd gear. Once it is in 3rd, hitting the pedal, it… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1975 450SL: drove..wont start..fine, replaced the coil and a resistor
I have a 1975 450SL that we took out of storage on Saturday, drove it around for a couple of miles and put it in the garage. Now it won't start at all. Battery checked out fine, replaced the coil and … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1975 Mercedes Benz 450SL: considering buying..hardtop..120,000 miles
Hello - I am considering buying a 1975 Mercedes Benz 450SL 2-door hardtop. It looks very clean but has 120,000 miles. What can you tell me that I need to know before paying $5000 for this car. Thanks,… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1975 450sl: the driver side headlight (low beam) light..wiring..bulb
i have a 1975 450sl and the driver side headlight (low beam) light is not working. we have power in the wiring until we touch the bulb to the wiring.… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Mercedes 450sl: the idle speed screw wont adjust at all.I..used one
My Mercedes 450sl idles at about 2000 rpms.Also the idle speed screw won't adjust at all.I replaced the Auxillary Air valve with another used one.There was no change.I also tapped it with a hammer to … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1975 450SL: park..hour and it wont start again..It cranks..gas pedal
My 1975 450SL seems to stat well in the morning. I drive it 3 or 4 miles and park it for about half an hour and it won't start again. It cranks well; the stater motor is fine, but won't fire up unless… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1977 450SL: seating still the temp gauge goes up to 220f
I have a 1977 450SL and when seating still the temp gauge goes up to 220f and when driving it will go down to 180f is this normal… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Mercedes-Benz 450SL: my brakes behaved..pedal..drove..occurance
I have a Mercedes-Benz 450SL (1975). Over the past few months I noticed that my brakes behaved somewhat unpredictably - all of a sudden the pedal would go all the way to the floor - but with time it w… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1976 Mercedes 450SL: a rough idle problem..misses..intermittently
I have a 1976 Mercedes 450SL that has a rough idle problem when the engine is cold or hot. It is worse when the engine is hot. And it misses intermittently during the rough idling. I call the missing … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
450sl: with 96,000 miles on it..hesitation..is intermittent..cap
I have a 450sl with 96,000 miles on it. I just started getting a hesitation on it but it is intermittent. I have replaced all plugs, cap and new wires. always add premium gas and added sea foam to it … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
I have a 1976 Mercedes 450SL. The car has been sitting for
I have a 1976 Mercedes 450SL. The car has been sitting for 8 years. I have it running but I have alot of light gray smoke from the tail pipe, like it is running rich and the fuel consumption is very h… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1975 mercedes 450sl: Trans..shifting..up gears..mechanic changed
1975 mercedes 450sl. Trans was shifting very hard in all up gears. Local MB mechanic changed the modulator to a new upgraded MB modulator. He says he hade to adjust the rods or pins, can't remember wh… read more
Steve
Steve
Vocational, Technical or Trade Scho
204 satisfied customers
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Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

29,460 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

6,536 satisfied customers

20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

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Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

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Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

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Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

444 satisfied customers

Work and diagnose electronics on daily basis.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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