adrianb
Senior Member
- Joined
- May 24, 2004
- Messages
- 60
- Reaction score
- 1
- Location
- Nr Saffron Walden
- Your Mercedes
- W210 E320cdi Est. W124 E220Est, W124 230TE, W123 230TE (various) W123 200T.
My 1994 W124 E220 auto has just failed it's MOT on a few points, front bulbs wrong colour, rear brake pad below min thickness (1.5mm) and emissions, which is the one that is biggest worry:
Fast Idle test
CO 0.96%
HC 217ppm
Lamda 1.20
2nd Fast Idle test
CO 0.89%
HC 224ppm
Lamda 1.21
Natural Idle
CO 0.83%
The pass levels are:
Fast Idle
CO 0.3
HC 200
Lambda 0.97 - 1.03
Natural idle
CO 0.5
I changed the air filter before the test, and it had a bit of run up a dual carriageway, but it wasn't hammered. My dash temp gauge seems to read at around 60 when warmed up, which is about 25 degrees below what I'd expect as normal. I changed the thermostat, but that hasn't changed the dash reading. When the engine is warmed up, the heater certainly feels like the car is up to temp, which makes me think that maybe a temp sensor is duff. I've got a few questions:
Does the sensor for the dash temp guage also feed the engine management system? If so I'm guessing that if it's duff, changing it might improve the emission readings.
If the dash guage runs off a different sensor, is there any simple way of checking if the engine management sensor is working OK (and the oxygen sensor?)? I've got a multimeter.
The MOT lists the indicator bulbs as being the incorrect colour:
"Nearside front (white) Direction indicators incorrect colour [1.4.A.2d]"
The indicator lenses are both clear, and both have orange bulbs - are these illegal aftermarket lenses? I'm sure I've seen plenty of other cars with these style of lenses.
While I'm doing the rear pads (same fitting as the earlier 200 / 230 TE?), I've got an adisory on excessive play in the rear ns wheel bearing - are these adjustable?
Cheers.
Fast Idle test
CO 0.96%
HC 217ppm
Lamda 1.20
2nd Fast Idle test
CO 0.89%
HC 224ppm
Lamda 1.21
Natural Idle
CO 0.83%
The pass levels are:
Fast Idle
CO 0.3
HC 200
Lambda 0.97 - 1.03
Natural idle
CO 0.5
I changed the air filter before the test, and it had a bit of run up a dual carriageway, but it wasn't hammered. My dash temp gauge seems to read at around 60 when warmed up, which is about 25 degrees below what I'd expect as normal. I changed the thermostat, but that hasn't changed the dash reading. When the engine is warmed up, the heater certainly feels like the car is up to temp, which makes me think that maybe a temp sensor is duff. I've got a few questions:
Does the sensor for the dash temp guage also feed the engine management system? If so I'm guessing that if it's duff, changing it might improve the emission readings.
If the dash guage runs off a different sensor, is there any simple way of checking if the engine management sensor is working OK (and the oxygen sensor?)? I've got a multimeter.
The MOT lists the indicator bulbs as being the incorrect colour:
"Nearside front (white) Direction indicators incorrect colour [1.4.A.2d]"
The indicator lenses are both clear, and both have orange bulbs - are these illegal aftermarket lenses? I'm sure I've seen plenty of other cars with these style of lenses.
While I'm doing the rear pads (same fitting as the earlier 200 / 230 TE?), I've got an adisory on excessive play in the rear ns wheel bearing - are these adjustable?
Cheers.