p0300 301 302 303

[harvey]

can any one help i have 2001 c320 mis-fire fault told to change mas which i have done ,worked fine for a bit then fault came up again told it might be spark plug coils is there any way to test them

 

[television]

Where did you buy the MAF from

 

[harvey]

it is a bosch from euro car parts

 

[jibcl500]

You need diags running to see what the faults are, Ive seen a few V6 in the last few weeks with ECU failure, coil packs, ecu and MAF are all related, one takes out the other.

jib

 

[harvey]

do i take the car to mercs

 

[Cole@MBS]

Or a indi with star!!

 

[television]

OK P0301 is a miss fire and 0302 is cylinder 2 and 0303 is cylinde 3 so there you have, a coil pack or it should be

 

[Cole@MBS]

Two coils gone down at the same time Malc!!!

 

[harvey]

what sort of price would they charge

 

[television]

Two coils gone down at the same time Malc!!!

Good point, good job its not MB servicing as it would have had 6 new ones by now

 

[Cole@MBS]

Go with Jib here, poss ECU or the one people always overlook is water in the fuel rail!

 

[harvey]

is water in the fuel rail simple to check

 

[Cole@MBS]

No, it means stripping the whole rail of, cleaning it all with carb cleaner and refitting it all, takes time and care!

 

[television]

Would it be worth unplugging the MAF just in case it has gone down

 

[harvey]

once i unplug what should i do or look for

 

[television]

once i unplug what should i do or look for

Many cars drive with full power again when unplugged, idle may be rough,but try it,just pull out the plug

 

[Cole@MBS]

Wouldnt cause a mis on just the two, you would have mis-fires across the 6, know a bit about the V6s!!!

 

[harvey]

could it be the maf or shall i take it to a tech with star

 

[Cole@MBS]

Dont waste money guessing, get it hooked up and see what the live data is showing you!

 

[Uncle Benz]

Cylinders 1,2 and 3 (corresponding codes 301, 302, 303) are all on the right hand bank, viewed from the drivers seat. Water in the rail is a good suggestion, but I would also be looking at anything common to just that bank. Lambda sensor fault or a blockage in the cat maybe.