Fuel Economy Sensor - 190E 2.3 AT

**ralliart17** · May 5th, 2010 05:44 PM

gurus, quick question.. saan sensor nakakabit yung Fuel Economy meter sa instrument panel.. since umandar yung kotse, lagi syang nasa red, di sya gumagalaw. May this be causing the excess fuel consumption ng car?

Thanks!
Mark

**ghosthunter** · May 5th, 2010 05:46 PM

ever considered that the sensor could be faulty?

**ralliart17** · May 5th, 2010 06:00 PM

Originally Posted by ghosthunter

ever considered that the sensor could be faulty?

it was working kasi nung bago binaklas.. saka we're not sure kung san location nung sensor para dun...

**ghosthunter** · May 5th, 2010 07:03 PM

From what I know, the fuel economy gauge sensor might actually be a oil pressure sensor. Unfortunately I am no MB expert.

**Benzmizer** · May 5th, 2010 10:23 PM

I do remember experiencing the same on my 107 before. Found one of the "vacuum line" disconected at the engine bay. Sorry but I was not able to picture the part that was connected.... but it should something near the HVAC area.

Good luck!

**Benzmizer** · May 5th, 2010 10:35 PM

I do remember experiencing the same on my 107 before. Found one of the "vacuum line" disconected at the engine bay. Sorry but I was not able to picture the part that was connected.... but it should something near the HVAC area.

Good luck!

**mbeige** · May 6th, 2010 03:40 AM

Originally Posted by ralliart17

gurus, quick question.. saan sensor nakakabit yung Fuel Economy meter sa instrument panel.. since umandar yung kotse, lagi syang nasa red, di sya gumagalaw. May this be causing the excess fuel consumption ng car?

Thanks!
Mark

The fuel economy gauge is a simple vacuum line routed to the intake manifold. It is a very rough estimate of your fuel economy. Maybe somebody routed it to a vacuum port that is always sucking air, or just plugged it off. I forgot if the system defaults to red when it's off or in the clear.

Regardless, I would find the vacuum hose and route it to the intake, near the brake booster. That's how it is in a 2.6, maybe the 2.3 is similar.

In principle, when you step on the gas, the intake manifold vacuum increases. So the economy gauge senses this and indicates the level of vacuum in the intake. The more vacuum, the more you are consuming fuel (since you're stepping more on the pedal). It's a glorified vacuum gauge. That's how it works.

**lowslowbenz** · May 6th, 2010 11:56 AM

What Pat said is correct .........

OR

Your air / fuel mixtures adjustments are way off spec...

**ralliart17** · May 6th, 2010 05:06 PM

Originally Posted by lowslowbenz

What Pat said is correct .........

OR

Your air / fuel mixtures adjustments are way off spec...

I'll check the vacuum hoses..

and I might considering the second option... pag cold start kasi, ok ang idle ng kotse, asa 1K rpm then babagsak sa 750 pag naka aircon.. pag mainit na, sobrang baba na nya as 5K na and shaky na sya pag naka engage transmission..

**BJ71** · May 6th, 2010 11:53 PM

Originally Posted by ralliart17

I'll check the vacuum hoses..

and I might considering the second option... pag cold start kasi, ok ang idle ng kotse, asa 1K rpm then babagsak sa 750 pag naka aircon.. pag mainit na, sobrang baba na nya as 5K na and shaky na sya pag naka engage transmission..

check mo rin yun ICV baka madumi o kaya nag loloko na