Join Date: Jun 2009
Location: Ocean Isle Beach, NC
Vehicle: 2003 SLK320 31,000 miles
Mentioned: 3 Post(s)
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Thanks for the info. I cleaned the MAF last week before I ran any checks. The car is fine on light throttle but if I drive it hard it runs very lumpy on idle. Maybe I need to replace the MAF? This morning I swapped the coil packs over and the P0303 code cleared (misfire on 3) But shouldn't I have seen a fault on another cylinder? and also checked for vacuum leaks, all ok.
I'd wait a bit to see if the P0303 code reappears. Certainly wouldn't replace anything until it does. As for the P0170 that often is a MAF issue. If you do decide to replace it, please read some posts about using a real Bosch MAF vs. some of the aftermarket junk that's out there.
2003 SLK320 40,000 miles - now lives in Tucson with my daughter
1959 220S Cabriolet - sold - now lives in Malta
1983 240D 351,000 miles original owner - sold
1999 E300D 215,000 miles
2014 Smart electric 17,000 miles
2014 Smart electric 9,000 miles