at wide open, my Mercedes chokes and loses power, no codes show and it runs well the rest of the time, as long as I don't floor it. Is it a throttle position sensor or what else can it be?
15

Asked by SergeR129 Apr 15, 2017 at 08:14 PM about the 1999 Mercedes-Benz SL-Class SL 500

Question type: Maintenance & Repair

4 Answers
221,185

Rowefast answered 7 years ago

There usually would be a code for the TPS. You could be running out of fuel, not enough fuel pressure. Could be the fuel regulator, or the fuel pump is getting weak. Some fuel pressure test can be done to determine a fuel issue.

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15

SergeR129 answered 7 years ago

I can rev up the engine if not kick it all the way down and after cleaning the MAF and throttle body, it goes up by another 1000 rpm now. Still think its the fuel pressure?

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221,185

Rowefast answered 7 years ago

Yes, still have the fuel pressure regulator on my mind. But cleaning the Mass Air Flow is kinda telling me the engine needs some maintenance.

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