Mercedes c320 running rough at idle and underpowered

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Mercedes man

Active Member
Joined
Dec 23, 2012
Messages
220
Location
Gravesend
Car
Mercedes c43 amg
My c320 petrol V6 2001 has rough idle and poor performance checked usual suspects maf , air leaks ,leads, plugs coils,fuel pressure 55psi all the time fuel volume ok,check cat back pressure none about 1psi max reving ,any ideas also bat voltage charge ok .done compression check all 150 to 155psi any ideas thanks::fail
 
MAF sensors are a common fault on these engines. Also the HT leads and coil packs. If you have checked the spark plugs and they are okay then I'd get the car put on a STAR diagnostic machine by your local MB Specialist or dealer. The EML light does not come on sometimes even when a fault code is stored I believe.

I will put my money on a faulty MAF or coil pack (s) or HT leads or a combination of these items.

To check the HT leads, you can measure their resistance values and also check for water ingress on their contacts as moisture could get onto their contacts and effect the spark performance.

Sent from my GT-I9505 using MBClub UK
 
I will put my money on a faulty MAF or coil pack (s) or HT leads or a combination of these items.

Yes...
 

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