blk06e55

I have noticed lately if I'm in M mode and rev through 1st it have a slight Hesitation/ miss.. Also it just does not seem to be pulling as hard as it used to after the LET flash.. Maybe spark plugs? Any ideas? I might get it dyno'd to see the numbers to know for sure if it's low on power or not.. Any help would be appreciated guys...

Ali_E55

if it feels like hecups, then you need sparkplugs, espacially when RPM reaching near 4,000

bassn_07

What is MB recommendation on changing out the spark plugs. I would do a search but since you brought up the topic I thought I would ask .

blk06e55

Yes, that would be the best way to describe it actually.. Is that part of the warranty??

Ali_E55

i recall there is a thread about it, u can search

but everyone recomends using OEM plugs.

it is useful to change them every 2nd service. which is every 20,000. but again, depends on how you drive. and the timein the year. summerr = hot air = wear off more

Ali_E55

no i think it is not part of the warrenty as these are usage parts like brake bads, tyres, etc

but if u have service contract. then they sure are

blk06e55

If not warranty then how much we looking for new plugs?

Ali_E55

i don't think they are expensive

shouldn't reach $100. it depends from place to place.

here in UAE i can 1 OEM plug for about $10. so about $80. but then. you have labor charge.

there is a thread about how to change them i think. chak the sticky threads under DIY

blk06e55

Ok I'll look into hopefully it fixes my issue.. How many miles before plugs need replaced?

jangy

100K

jangy

This hapenned after a tune? How long after? If it is too lean, the plugs will gunk up.

blk06e55

100k? I'm only at 36k... I got the LET flash about 3 weeks ago and the car was running amazing... He said the tune was a little richer than stock... Maybe I should get a dyno with a/f readings?

Ali_E55

100K.

WTF. our dealer change them every 2nd or sometimes 3rd service.

but again. our heat may cause it to wear out fast.

dunno.

i just have to go with what they say, so that they don't blabla bla about warrenty and other things

stealers not dealers.

bassn_07

I'm at 42k right now and I'm thinking it's time to change the plugs and wires. It seems that many modded cars have gone with a one step cooler plug.

bbearden

A lean condition will not cause plugs to foul out. The converse is actually true. A lean condition will cause the engine to actually run hotter and your plugs will have a tan color to them.

Your A/F ratio likely was maladjusted during the tune, and like you said, probably on the rich side.

blk06e55

Would it running a little rich cause anything bad?

Ali_E55

mine is tuned and in STAR it was made, slightly Rich

but the tuner did that. because it showed that there light engine on. indicating low fuel pressure. he said mine was the first one that he had to do it after tuning ><

blk06e55

just drove home and yes, does the hiccup around 3500-3800rpm in 1st gear almost everytime it seemed like..

Fr33kn63

I was at 22k when had to change out my plugs. Was feeling strange hesitation. There is a thread someplace around here with pics I took of what they looked like, but were BLACK as all hell at those miles. Replaced them and felt like a new car!

AudiOn19s

Aren't there 2 plugs per cylinder in the E55?

Fr33kn63

yes 2 plugs per cylinder on the e55, so 16 required for it and 1 per cylinder on the e63 so a total of 8.

TopEndS62

My thoughts exaclty...

Not to be disrespectful but this thread has mis-information

e500 and e55 = 16 sparkplugs

mercedestech2

A lot of times I have found that it's not the plugs that cause this, but the wires.

CharlyE500

I think most of Mercedes has 2 per cylinder, my E430 W210 has 16.
Or the dealer charged me extra 8 .....

CharlyE500

BTW, if need to change the cables, what kind of cable is good and around what price ? my car is 06 but got 76k now..... might need to do some work on it...