|
|
|
#1
|
|||
|
|||
300E Emissions Test Results
Hi,
Can anyone tell me what can be said of the following results: HC 0.542 Standard is .455 CO 2.704 Standard is 3.419 CO2 330.0 No Standard listed State of IL Car: 1990 300E 134K miles. Just thought something might be told from the results. Seems to me that the car is running rich. Thanks. chicago124 |
#2
|
|||
|
|||
There is nothing major wrong with your car. Was your cat good and hot? This is the most important thing. Unless the cat has been replaced, I would say it is down to 10-15% efficiency.
Run some injector cleaner though it, run at high speed for 20-30 miles. Gas up with new before retest. Check plugs, gap, condition. Check wires, resistance. RorR air filter. check for vacuum leaks before & after the intake. If possible scope the O2 for sluggish response.Check timing.Check coil that its hot enough. Lastly, check EGR ( if equipt) for flow constrictions. ie carbon build up. Good Luck. |
#3
|
|||
|
|||
Hi,
I passed the test in spite of a fault code for the Oxygen Sensor. Go figure. The Cat was pretty hot in that I drove for about 20 minutes before the test. Perhaps a failing 02 sensor might have caused the high HC level? I've changed the plugs about 3000 miles ago and the old ones were perfect -- light brown in color. Wires were done about two years ago. I plan on changing the oil this weekend and running a couple of bottles of Techron before the change. The injectors are fairly new but cleaning them can't hurt. Thanks. chicago124 |
#4
|
|||
|
|||
If your O2 sensor has failed, you will be running open-loop. Likely your pre-cat HC emissions are very high, and the cat is sucking it all up, consuming its 9 lives rapidly. Save the cat and fix the problem - O2 sensors are much cheaper.
Steve |
#5
|
|||
|
|||
Hi Steve,
Thanks for your reply. I agree with you -- I forgot to mention that I'll be replacing the sensor this weekend too. I'd rather not have to replace the cat:-) Regards, chicago124 |
Bookmarks |
|
|