Question about 1997 Mercedes-Benz C-Class
I have two diagnose errors: "Second air" and a EGR malfunction. Motor runs on cold engine very poor, on warm engine much better. Continuous failure code P0170. Replaced already MAF and second O2 sensor. I want to replace my EGR valve on my 2005 C Class mercedes where is this located and is it hard to change myself ? and where is the best place to buy one from ?
This is a common problem with the 104 engine. I'm assuming it is a c 280. First you need to check a couple of things. Below your intake manifold there is a source vac. line running to a switchover valve located under the plastic cover on your front cam cover. that switch over valve operates your 2ndary air inj. and egr pipes. The codes you have are saying that these 2 systems are not operating. If the source is good take of the plastic cover on your valve cover(held in by 5mm. allen head bolts). the 2 vac lines running under that trough are running to your egr and your 2ndary inj. the 1st is the air inj. the rear one is your e.g.r. valve. If these systems just plain were not operating it would not cause your car to run poorly cold unless there was a vac. leak. Take a vac. pump and apply press. to your e.g.r. valve with engine running and you should notice a rough run when vac. is applied. The 2ndary air inj. is more complicated to test because there is more involved. Fixing this vac. leak will help get your adaptations under control and your vehicle will run a lot better
Posted on May 29, 2009
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Posted on Jan 02, 2017
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