i have a 1992 190e 2.6 w/ 85 k miles. 2 weeks ago the car went from getting 250 miles on a fill up to just 175. i replaced the plugs and o2 sensor. i got 230 miles from the next full tank. the following tank i was back to 180. its definatly not the odometer. any ideas

Just a guess,


Check the Temp sensor, maybe your KE injection thinks the engine is cold all the time.... Does it burn your eyes rich when warm?


Michael

__________________
Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E

is someone stealing your gas ? do you notice fuel smell ? do you have a fuel leak

__________________
Jerry

2004 SL500 Black 55K Miles
2002 s500 Black 90K Miles
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles

#1 no one is stealing the gas. i can see the gague go down when i drive. dont notice any smell or see any leak
#2 it does seem to be burning rich. now that u mention it i have noticed that it has been taking a bit longer than usual to accually get warm.
also when i put gas in it tonight i noticed that there seems to be some sort of exaust leak just in front of the rear wheels.

could it be a bad t-stat?

It would only be a bad thermostat if the engine is not running at the proper temperature.

__________________
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record

First verify if it is running rich. Pull a sparkplug and check if it's "wet" or fouled. Running rich is going to kill your catalytic convertor sooner than later. If rich running is confirmed, then it's a part hunt. Even though the O2 sensor is new, it wouldn't hurt to verify it with a ohmmeter once it's at operating temp. Then check the engine temp sensor and air temp sensor for the CIS fuel injection. (Notice that I tend to work from the cheap parts first.) After that, you have to go to the more expensive parts, like the ECU and the fuel distributor.