C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

C320 acceleration issues

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Old Aug 2, 2020 | 11:30 PM
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Escott16's Avatar
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2001 w203
C320 acceleration issues

I have a 2001 c320 with 120k miles. I recently broke down with cylinder 1,2,3 misfire. I replaced the spark plugs because I needed to anyway and it fixed that misfire issue but I am getting a serious lack of power and misfire at acceleration that I didn’t have before that sometimes( 25% of the time) that does not throw any codes or lights. I hit the gas and it struggles and pops(exhaust) when accelerating then is fine after 5 seconds. Any suggestions. It’s perfectly fine on the highway and has full
power and only does this at very low rpm
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Old Aug 3, 2020 | 02:37 PM
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Russell Ormerod's Avatar
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not a merc
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Old Aug 5, 2020 | 02:45 AM
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C320
Check your fuel pressure. It should be around 53psi at all time even when you rev it. The symptoms you describe sound like a failing fuel pump.
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