My CEL is on and the reader is telling me that it's suffered a #1 cyl misfire , a #2 cyl misfire , a #3 cyl misfire and a random misfire but is not pulling a code for anything that might cause it . Any guesses as to what might be the issue ? I thought perhaps it could be moisture in the plugs/coil packs but I checked them and they were fine - and the plugs looked as they should . The car seems to drive fairly normally until ~ 4200 RPM's at which point it is very sluggish - almost as if there is a fuel delivery problem . I'm going to change the fuel filter tomorrow in hopes that maybe I just got an especially bad tank of fuel but is there anything else I might want to check that could be causing this problem yet not make the OBD find a fault ?

Thanks .

 

possibly try disconnecting the battery. The CEL will reset and if there is a problem, it will come back and maybe it will throw the right codes at you.

*FYI* --> If you have the stock radio, make sure you have your radio code or call your dealer and ask for it because your radio will reset.

 

MAS MAS MAS MAS MAS MAS MAS MAS MAS

 

damn..why didn't i think of that. Yea, misfires are probably due to a bad MAS (mass airflow sensor)...prolly allowing too much air or not enough air.

 

I cleaned the MAF with some contact cleaner and it's working just as it should - not sure if it's a permanant fix yet but it certainly hasn't run this well in weeks ! Judging by the number of posts on this subject , at least a couple people from Bosch and MB service departments could retire on these things alone

 

hey, how'd u clean the maf, i'm thinkin of doing it,
thankx

 

I put mine in a ziploc bag with some rubbing alchohol and shook it around for a while. Don't touch the actual sensor with anything.

 

sweet, i'll try that. i had a cold air intake but stuipid walmart puntured my intake pipe when i went in for an oil change( which they coulnd't figure out how to do...), so i just stuck the cone at the maf for a short ride and my CEL came on. i'm gonna try cleaning it, did your cel go away?

 

I just disconnected the entire assembly as I don't have any safety torx to get the sensor itself out entirely , and sprayed it liberally with electrical contact cleaner - anything from carb cleaner or rubbing alcohol to Simple Green will probably work I'd venture . It might be best to leave the sensor in the housing anyway as it should minimize the chaces of damaging it . I just set it aside to let it air dry ; meanwhile I disconnected the negative terminal on the battery to reset the ECU and after it seemed good to go , reassembled it and it's working great . Now as soon as I get my SRS light to reset and figure out why the radio code my dealer gave me won't work I'll be set !

 

nice...hopefully the MAS will last a little longer now

As for the SRS, that usually is a belt buckle problem (i fixed it once passanger side...after a while, the light came back on, diagnosed to be drivers side buckle, haven't fixed it since. Been on for a lil more than a year now...just stays on for 2 mins when start up and goes away. my sa said just a delay...so for 2 min, no airbag).

radio code should work, as it was given by the dealer...possibly they gave the wrong one? or looked up the wrong one...

 

Try try coil ends. 3 of them sit between the spakplug and the coil packs. 3 of them at $10 bucks each or so. Very common problem causing misfies.