[lron2154]

I have the 335i e92 n54 it has 83K on it and I don't think it has ever been walnut blasted if there's to much carbon build up will it throw a misfire under hard acceleration at times?

[fazman]

Originally Posted by lron2154

I have the 335i e92 n54 it has 83K on it and I don't think it has ever been walnut blasted if there's to much carbon build up will it throw a misfire under hard acceleration at times?

When mine was misfiring at about 92k miles, the dealer had CPO'ed my injectors (and new spark plugs) and my coils and I would still misfire... had a local Indy carbon blast my car at about 95k miles (previously I had mine carbon blasted at 45k miles just because).

no misfires since the carbon blasting and I'm at 105k miles now. So the short answer is yes... carbon blasting could cause your issues with misfires and cyl 5 and cyl 6 are usually the dirtiest so if you are getting misfires on them... its likely the carbon build up. The easiest way to diag is to move the coils from the misfire cyl to a different cyl and see if the misfire follows the coil or stays on the same cyl.

Usually spark plugs need to be changed every 45k miles on a stock car and 25k miles on a tuned car.

Injectors get leaky when they leak

Carbon blasting is something you will need to do at least once before you hit 100k miles (I did mine every 45k miles).

[lron2154]

Originally Posted by fazman

When mine was misfiring at about 92k miles, the dealer had CPO'ed my injectors (and new spark plugs) and my coils and I would still misfire... had a local Indy carbon blast my car at about 95k miles (previously I had mine carbon blasted at 45k miles just because).

no misfires since the carbon blasting and I'm at 105k miles now. So the short answer is yes... carbon blasting could cause your issues with misfires and cyl 5 and cyl 6 are usually the dirtiest so if you are getting misfires on them... its likely the carbon build up. The easiest way to diag is to move the coils from the misfire cyl to a different cyl and see if the misfire follows the coil or stays on the same cyl.

Usually spark plugs need to be changed every 45k miles on a stock car and 25k miles on a tuned car.

Injectors get leaky when they leak

Carbon blasting is something you will need to do at least once before you hit 100k miles (I did mine every 45k miles).

thanks for the help I keep misfiring in cyl 4 and cyl 6 they tested HPFP LPFP and injectors everything was good for little there they wanted to say I bent a valve as well and idea if that is possible it is an automatic mods are DCI,DP,Charge pipe and yes its old but I have the procede tuning system

[mike@x-ph.com]

Did you change the spark plugs and ignition coils?

[lron2154]

Originally Posted by mike@x-ph.com

Did you change the spark plugs and ignition coils?

yes both are new were installed about three weeks ago.

[mike@x-ph.com]

Originally Posted by lron2154

yes both are new were installed about three weeks ago.

Since injectors are good as well do the walnut blast. I would also double check that the procede map is not too aggressive for your mods.

[lron2154]

Originally Posted by mike@x-ph.com

Since injectors are good as well do the walnut blast. I would also double check that the procede map is not too aggressive for your mods.

what map should I be running with this mods?
DCI
down pipes
muffler delete
charge pipe
and procede of course

[mike@x-ph.com]

Originally Posted by lron2154

what map should I be running with this mods?
DCI
down pipes
muffler delete
charge pipe
and procede of course

Im not familiar with procede maps

[lron2154]

Originally Posted by mike@x-ph.com

Im not familiar with procede maps

okay thats fine thanks a lot for you help I appreciate it.

[fazman]

Originally Posted by lron2154

thanks for the help I keep misfiring in cyl 4 and cyl 6 they tested HPFP LPFP and injectors everything was good for little there they wanted to say I bent a valve as well and idea if that is possible it is an automatic mods are DCI,DP,Charge pipe and yes its old but I have the procede tuning system

wtf... bent valve??? are you kidding me? what you running past redline and have valve float??

you have all your bases covered, rest assured that a carbon blast will make your car back to new again. bent valve... lol... when they do the carbon blast have them look at the intake valves to see if any of those are bent

[lron2154]

Originally Posted by fazman

wtf... bent valve??? are you kidding me? what you running past redline and have valve float??

you have all your bases covered, rest assured that a carbon blast will make your car back to new again. bent valve... lol... when they do the carbon blast have them look at the intake valves to see if any of those are bent

Hahaha damn mechanics you know how they are hahaha.

[fredcase]

I had brand new plugs, coils, injectors and dme. Still would get a misfire. Did the walnut blast myself. No more misfire. So yes.