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#1
03-16-2005, 03:23 PM
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sudden drop in fuel economy
So, the plugs and resistor tips were replaced 3 tanks ago, and I got better performance and about the same mileage until this tank, whereby I have run to the last line on the gauge 40 miles sooner than normal, and the car feels like a slug. Any ideas? Air filter is clean, tire pressure is fine.
97 C 230, 81k. 
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#3
03-16-2005, 03:57 PM
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Well, not the same as the previous 2 tanks, but from one of 3 places I use. I used to drive diesels, so I can definitely tell when I get bad diesel, but gas is another story. I would think it would run rough too? Strange. Then again, my car does have a jeckyll and hyde personality sometimes.
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#4
03-16-2005, 04:15 PM
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My best guess would be to have the fuel filter changed.
__________________
2002 G500 74K  1998 E300 200K and rising  1995 S600 73k  "Some people spend an entire lifetime wondering if they've made a difference. The Marines don't have that problem."-Ronald Reagan "Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity."-General George S. Patton
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#5
03-16-2005, 04:16 PM
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Do you think it is running rich? (exaust smell more overpowering than normal)
__________________
-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13 http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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#7
03-16-2005, 05:03 PM
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If it were my car I would test the 02 sensor and the water temp sensor... If it is out of range, thinking its colder than it is, it can over enrich all the time.
But Im not really familiar with your cars fuel injection & emmission systems...(97 C230 right)... I don't even know if you have a water temp sensor. Try the snif test after it has fully warmed up though to just get a rough idea if it seems to be burning too much fuel. Wish I had more to offer. Good luck.
__________________
-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13 http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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