DiggZ Posted June 5, 2009 Share Posted June 5, 2009 Hi guys, been suffering from this problem intermittently for a while now. Basically I am getting a misfire fault on the engine, the code which has been coming up has been P0304 on cylinder 4, until this week a P0300 random misfire code popped up. Been searching and reading a few of the other threads with interest and it seems to come down to a few possibilities, wondering which order I should be checking these if anyone has any views: - O2 sensor - Coil Pack - Fuel injectors Also would cleaning out the throttle body help? I ask this as it is sometimes taking a while to get the car started from turning the engine over. Other than this the car seems to drive fine with no obvious issues or power loss. Cheers Quote Link to comment Share on other sites More sharing options...
Ekona Posted June 5, 2009 Share Posted June 5, 2009 O2 sensor is irrelevant, it sits after the engine so nothing to worry about there. Could be a dodgy coil pack or sticky injector, swap them on cylinder 4 with cylinder 1 one at a time to see if the misfire moves, will tell you if it's the pack or the injector or neither! Quote Link to comment Share on other sites More sharing options...
sunset350z Posted June 5, 2009 Share Posted June 5, 2009 Whats the mileage?, maybe time to change the spark plugs as well. If its due for a service take it in and see what they come up with. Quote Link to comment Share on other sites More sharing options...
DiggZ Posted June 5, 2009 Author Share Posted June 5, 2009 Cheers, will get it into the garage and try swapping the coil packs and injectors round. How easy is it to do this? Mileage is coming up to 68k so is due a full service soon but I replaced the plugs around 10k ago Quote Link to comment Share on other sites More sharing options...
Madden Posted June 5, 2009 Share Posted June 5, 2009 I had the same problem mate and it was the o2 sensor on bank 2 Took me ages to find the problem but once i found that bank 2 was running lean i changed the 02 sensors round and the other side went lean There are 4 sensors on the car. 2 pre cat which are widebands ( it a uk car) and 2 after the cat that dont really do anything bar check the cat's condition. I was only ever getting p0300 random misfire. I even changed my injectors for a set that where fresh out the flow bench. Easy job but it didnt slove my problem. Coil packs normally die and then don't come back. Quote Link to comment Share on other sites More sharing options...
DiggZ Posted June 5, 2009 Author Share Posted June 5, 2009 Cheers, have read through the thread and I have been getting the P0304 code with misfire on cylinder 4, but this week had a P0300 random misfire come up. Think I will start with swapping the coil packs/injectors round and seeing if the fault moves to another cylinder, then move onto O2 sensors if it comes up P0300 again. Quote Link to comment Share on other sites More sharing options...
Madden Posted June 5, 2009 Share Posted June 5, 2009 Yea if you just have a p0304 cheange the coil packs round and see what happens. Quote Link to comment Share on other sites More sharing options...
Ekona Posted June 5, 2009 Share Posted June 5, 2009 There are 4 sensors on the car. 2 pre cat which are widebands We have wideband O2s on our car??!! Okay, that's going to make hooking up an AFR meter easier in the future...! Quote Link to comment Share on other sites More sharing options...
Madden Posted June 5, 2009 Share Posted June 5, 2009 Yea the uk cars have widebands in them I have had 2 extra lugs welded into my cats so that i can put an extra wide band in to read my afrs. Thats the only reason i found my fault Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.