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It's running rough and has no power.? just had computer on…

Customer Question
It's running rough and...

It's running rough and has no power

Mechanic's Assistant: Have you metered out the ignition system?

? just had computer on it showing no faults

Mechanic's Assistant: What is the model/year of your Mercedes?

And changed maf sensor 2000 ml 320

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Cleaned fuel filter new maf

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Have a new fuel filter to put in tomorrow

Submitted: 7 months ago.Category: Australia Car
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Customer reply replied 7 months ago
Also have drained fuel tank and refilled with fresh 98 octane as thought bad fuel at start
Answered in 2 hours by:
11/28/2017
AU Auto Mechanic: Marty, Australia Car Mechanic replied 7 months ago
Marty
Marty, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 55,216
Experience: Bosch Certified Master Tech. Over 34 years experience.
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Hi, my name is***** you give me a little background on the problem?

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Customer reply replied 7 months ago
Was running fine we filled up at caltex instead of bp in 300 m it started running rough over 2 days it got worse to the point it would not go over 40km that's when I removed and clean fuel filter drained tank and refilled problem still there I got a new maf still rough putting in a new fuel filter today its not showing any lights on dash or fault codes on the ob2
AU Auto Mechanic: Marty, Australia Car Mechanic replied 7 months ago

If you have ruled out bad fuel I suspect that you may have a fuel pump failing. I'd perform a fuel pressure test. Also scan the ECU for fault codes that may point to the problem. Fuel pressure should be 60 psi at idle. Another possibility is a plugged catalytic converter. You can remove the front oxygen sensors from the exhaust and see if it has power with the sensors removed.

Let me know what you find.

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AU Auto Mechanic: Marty, Australia Car Mechanic replied 7 months ago

Just checking in. How are you doing with this?

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