2001 w203 C180 auto - cold idle & bad mpg

akz786

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Hi

Just the other day I started the car from cold and it started to idle erratically bouncing up and down did this for a few mins then it's ok for rest of journey
It's done this a few times now from cold start - the other symptom is that fuel economy is well down as is power at top end just seems sluggish.
Assumptions based on posts here at forum:
1. MAF sensor
2. Breather pipe - which one?
3. Cold start idle valve - not sure what or where this is?

Any help will be appreciated - before I go and spend on the on the MAF sensor...

Cheers
A
 

Pathfinder

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Code reader required?
 

alexanderfoti

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Get the codes read, as Pathfinder says.

No cold start valve on the 203, there is a breather pipe that can split that goes around the top of the engine, but the maf is the most likely bet.
 
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akz786

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Cheers guys, will get it booked for a scan, strangely no Engine management lights have come on?:confused:
 

Cole@MBS

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124 300 CE 24 Coupe, C220CDI, 1959:Morris Minor Dolomite sprint,
Nine times outta ten, its the breather pipes and one way valve under the super charger, we see a lot of these........
 
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akz786

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Im in madrid on business at the moment so will get to a garage re the code scan, so how many breather pipe(s) can I visually check when I get back?, (its non Kompressor model btw)

Cheers
A
 
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akz786

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Just got fault codes read as below:

P0136 - O2 Sensor circuit (Bank 1 Sensor 2 ) - Pending
P0135 - O2 Sensor Heater circuit (Bank 1 Sensor 1) - Pending

would both sensors be on the way out or does one depend on the other?

Now I just went out and checked the old Cam/Magnet/Sensor and its virtually dry so I guess I need to check the plugs of both Sensors to be sure and maybe change one first if its not full with oil?

Cheers
A
 


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