MercStraight6
Senior Member
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- Apr 7, 2009
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- Your Mercedes
- 1995 W124 E280 estate
I took the E280 (140k miles) in for it's MOT today, it wasn't too bad and only failed on 2 things:
-Excessive play in nearside front wheel bearing
-Exhaust CO content after 2nd fast idle excessive
I presume the wheel bearing is a simple matter of replacement, but I'm puzzled by the emissions.
The figures were:
Fast Idle #1 (2397rpm):
CO - 0.64%, limit 0.30 FAIL
Lambda - 1.02 PASS
HC Level - 132ppm, limit 200 PASS
Fast Idle #2 (2190 rpm):
CO - 0.53% FAIL
Lambda - 1.01 PASS
HC Level - 117ppm PASS
Natural Idle (694rpm):
CO - 0.17% PASS
The garage said the catalytic converter was probably worn out, or that the fuel system may just need adjustment.
I looked through the old MOTs and found that it has failed on CO before in 2007, but later passed without any explanation of what was done.
The car has been recently serviced and runs very well, it should have been warm for the test aswell because I had taken it for a fast 10 mile drive on the motorway.
I don't really want to replace the cat and I'm hoping it's something simple.
-Excessive play in nearside front wheel bearing
-Exhaust CO content after 2nd fast idle excessive
I presume the wheel bearing is a simple matter of replacement, but I'm puzzled by the emissions.
The figures were:
Fast Idle #1 (2397rpm):
CO - 0.64%, limit 0.30 FAIL
Lambda - 1.02 PASS
HC Level - 132ppm, limit 200 PASS
Fast Idle #2 (2190 rpm):
CO - 0.53% FAIL
Lambda - 1.01 PASS
HC Level - 117ppm PASS
Natural Idle (694rpm):
CO - 0.17% PASS
The garage said the catalytic converter was probably worn out, or that the fuel system may just need adjustment.
I looked through the old MOTs and found that it has failed on CO before in 2007, but later passed without any explanation of what was done.
The car has been recently serviced and runs very well, it should have been warm for the test aswell because I had taken it for a fast 10 mile drive on the motorway.
I don't really want to replace the cat and I'm hoping it's something simple.