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2013 ML350 4matic and 2003 C240 4matic
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33 Posts
Discussion Starter #1
When testing the fuel pressure, what should be the reading? When accelerating hard (especially when it is hot out) my car starts to jerk and hessitate a little. I am wondering if my fuel pump is weak as it does it around 3000-6000 rpm. I have a 2003 C240 4matic.
Marc
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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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19,439 Posts
How many miles are on the clock? When you get north of 100K, you can have catalytic converter troubles.
 

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2013 ML350 4matic and 2003 C240 4matic
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33 Posts
Discussion Starter #3
117k. Is there a way to test the catalytic converters? I am embarrassed to ask, but I have never dealt with them
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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19,439 Posts
There is no sure way to tell besides having a mechanic remove the exhaust pipes and check the pressure, but if shake the exhaust pipes and hear noises, or smell "rotten eggs" at the tailpipe, those, along with poor performance are tell-tale signs.
 

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2003 C230k
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13 Posts
im having the same problem, ive narrowed it down to vapourlock, although it could be more vapourlock is begginging my symptoms, your fuel cooling uinit could be down
 

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2003 C230k
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13 Posts
cats are a grey zone, and very expensive. a potential test could be a vac test. but like in rodneys post, there are physical signs as well
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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19,439 Posts
Another easy check for bad cats is to make sure they aren't glowing red (check them on a hot engine in a dark garage). Also, you can use an infrared temperature sensor. I am not sure how hot they should or should not get, but they shouldn't be significantly warmer than the exhaust manifold or adjacent exhaust pipes.
 
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