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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53469
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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This question is for Marty only.. Marty, from our last

Customer Question

This question is for Marty only.. hey Marty, from our last conversation. I ran some test on the vehicle. First I put the scanner on the car. (No codes came up) then i checked for any noise coming from the fuel pump priming when i turned the key (none). Then went checked the fuse and relay both were good. Then i got a hold of a fuel preasure test kit, tapped into the fuel rail and got no preasure when I turned the key. So i went ahead and ordered the fuel pump from the dealer. I installed it and the vehicle fired right up. In the past 4 days the car has been running perfect. One thing is I still can't duplicate the rattle sound from the exhaust on the left front that we had talked about. I will keep my ears out for that sound it it would ever come back. Do you think the misfire I had was caused by a faulty fuel pump?
Submitted: 3 months ago.
Category: Mercedes
Expert:  Marty replied 3 months ago.

Hi Luis, glad to hear you got it running. If the pump was running at reduced pressure it could certainly have caused a misfire but if you were only getting misfires for all 3 cylinders on one side of the motor I would still suspect a restricted catalytic converter. If it's running okay now I would just wait and see what happens.

Let me know if you need anything.