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#1
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126 1991 300SEL starting problems
I have a 1991 300SEL with ~170000 miles. Recently I have been having a tough time on cold starts. I crank and crank and it just does not catch. After about a minute of cranking, it catches. The first two minutes are rough with the engine really struggling. If I wait a few minutes and then give it some gas, the engine runs well. Once the engine is warm it runs fine. I don't have problems with warm starts.
Things I have done: Changed fuel injectors Changed air filter Fuel filter recently changed Fuel pump sounds good and changed 15K ago Oil change Any ideas?? |
#2
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Hi, this should be an easy fix:
First do the water temp sensor (located on the driver's side, top rear of the cylinder head): http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1Z40YZDXM1Z40YZSCO&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1991&product=C6020-12315&application=000041722 If that seems to help, but it still doesn't seem quite right, do the OVP: http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1Z40YZDXM1Z40YZSCO&year=1991&make=MB&model=300-SEL-006&category=All&part=Overload+Relay These are the first two parts I changed on my first 300 SEL and it was behaving exactly like yours. It starts like new now.
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(2) 1988 300 SEL W126 |
#3
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New plugs?
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'85 300SD (formerly california emissions) '08 Chevy Tahoe '93 Ducati 900 SS '79 Kawasaki KZ 650 '86 Kawasaki KX 250 '88 Kawasaki KDX200 '71 Hodaka Ace 100 '72 Triumph T100R |
#4
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plugs < 10K miles ago
so how does the water sensor and OVP lead to my problem?? Also, someone said I should change the bi-metallic choke spring. Any thoughts? |
#5
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The sensor tells the injection system's computer that it's cold and that it should activate the cold start valve, and for how long, and that it should richen the mixture until the engine warms up.
Bad readings from the sensor = hard start, poor warm-up. The OVP relay powers the computer and other electronics. If it, or its fuse is bad, then you have the same situation as above.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe |
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