i got a 2001 a4 1.8t. I replaced the coils and spark plugs and it still misfires. It idles fine but...It sputters and jerks when i give it any gas!WTF iscausing this? Here is a list of codes that i'm getting....

P0300 - Random/Multiple Cylinder Misfire
P0301 - Cyl. 1 Misfire
P0302 - Cyl. 2 Misfire
P0303 - Cyl. 3 Misfire
P0304 - Cyl. 4 Misfire

 

any CEL? if not check for vacuum leak

 

CEL is on. I've checked for leaks....still same problem. Could the vacuum line that goes to the DV valve cause this problem?

 

maybe your muffler bearing need lube....

...sux Ray.... probably a vacuum leak.. did you ever replace that DV hose with the one i got you???!!!

 

ya muffler bearing or Tailight fluid needs replacing...



sucks - hope it gets figured out...[&:]

 

LOL...I'm sure the muffler bearing is well greased and working properly! and yes i did replace that hose...still the same problem. I'm kinda thinking that it could be the MAF sensor. I'm gonna work on it tonight...we'll see.

 

U still under warranty? I had a similar problem...P0303, Audi took care of it in 30minutes...running like nothing happened. Good luck to you dude.

 

I just went through all that and pulled all the same codes and found out i had a bad Coolant Sensor. Probably the same thing on yours. I cleaned out my whole system with seafoam cleaned out the MAF and check every line and never found the problem until i had to take it in for the Rack and they found that my sensor had gone dead. Im going with the coolant sensor since that is a pretty common problem.

 

intresting.....

i am looking for some testing for yah Ray.... so far, from what i'vefound you need to use a Vag-Com... but there's got to be a simple voltage and resistance test... i'm justtrying to find the specs

 

yay! my car works again....it was the MAF all along! It has power that i've never felt before! Car runs great! The only problem that i'm having now is that the CEL never comes on! Like at all....you know when you turn the key (but don't start the car) the CEL show appear then disappear....well it doesn't even light up...therefore....still can't pass smog! I don't have any codes show at all but the dang light has never came on since i bought the car. I have no idea why....any suggestions guys?