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#1
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Poor gas economy
I am getting 13 miles to the gallon. My car is not burning oil/leaking, but when I get out of my car there is a smell of fuel/raw eggs. Whats the problem? Air/fuel mixture? O2 sensor? Time for a tune up? Also my aux fans NEVER come on, the relay is fine. Its it the fans themselves? Since the fans do not come on I do not use the AC.
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#2
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sorry...1992 300e 129 k mi
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#3
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Edit: What model?--oops, just missed your post. The smell seems like you are running at rich stop due to some sort of computer failure to control the mixture. Many possibilities . . .The O2 sensor and cat could take on damage if left too long. Manual mixture adjustment could be a temporary fix. I will leave it to others to suggest better solutions. Cheers, Andrew Seidel.
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86 560SEC 85 500SEC Lorinser 83 300D Turbo 75 240D Last edited by 5banger; 12-05-2001 at 11:34 AM. |
#4
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Does it come up to temperature? I had a thermostat break such that it was always open. The engine was always cold, ran open loop, and other cold engine things. But its better than breaking such that it was always closed
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#5
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The raw eggs smell is the sulphur from the catalytic converter...perhaps is clogged? That would hurt your mpgs tremendously!
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2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car |
#6
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I agree that if you are getting strong sulpher smells you likely have a problem with the cat converter and may need a new one. This would really screw with your mpgs.
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Jason Priest 1999 E430 1995 E420 - retired 1986 420SEL - retired |
#7
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Check coolant temp -- should be 87 C or so. If not, bad thermostat. Easy to fix.
If the temp is OK, you have a bad temperature sensor -- this is why your aux fans won't run. Get it replaced, again easy. Could have a broken wire, too, althoug this is rare with a Mercedes (NOT with Volvo, though!). You are running in open loop startup mode -- will kill your milage, your ox sensor, and your catalyst. Catalyst is expensive! You may also have a bad fuel distributor if you have the older fuel injection system -- common problem. I don't know when MB changed to the LH type from the K-Jetronic. If the distrubutor is bad, it will be expensive to fix, and my mechanic has been having fits getting good replacements -- put three on a car before he got one that lasted more than 5000 miles! If it is bad, you will be trailing black smoke! Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! |
#8
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The smell is a catylitic issue..what ever else is in play the smell is the catylitic converter
brian |
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