MarkRiv Posted July 14, 2023 Share Posted July 14, 2023 We were racing at Croft a few weeks back. First race successful, but second race had a misfire and we retired the car. Code p300 shown, reset but didn’t go away. Replaced spark plugs as the tips were looking bad. This didn’t resolve the issue. When at home I got a fault p340 bank1, this lasted a short while, came back a couple of times, but appears to be intermittent. I have replaced this sensor, but still getting misfire. Plugged obd in today and got an occasional message stating Fuel system 2 ol fault. During the race, the engine did get very hot, to the point the header was full of water. I have no doubt there are numerous potential causes, but would appreciate some pointers to check before spending lots of money. Any advice greatly appreciated. All being well, Silverstone 19th August! Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 14, 2023 Share Posted July 14, 2023 Check the coil packs. Quote Link to comment Share on other sites More sharing options...
MarkRiv Posted July 14, 2023 Author Share Posted July 14, 2023 Thanks. Is there a way of testing them without replacing? Would I not get a code for a specific cylinder or could they all be failing? Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 14, 2023 Share Posted July 14, 2023 Do you have the misfire on tick over? Quote Link to comment Share on other sites More sharing options...
MarkRiv Posted July 14, 2023 Author Share Posted July 14, 2023 Yes, but barely noticeable. Becomes more apparent when you increase the revs Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted July 14, 2023 Share Posted July 14, 2023 In that case, to identify which cyl. it just disconnect the coils one at a time and note how the tone changes. Quote Link to comment Share on other sites More sharing options...
MarkRiv Posted July 14, 2023 Author Share Posted July 14, 2023 Thanks, I’ll give that a try and let you know how I get on. Quote Link to comment Share on other sites More sharing options...
MarkRiv Posted July 15, 2023 Author Share Posted July 15, 2023 Problem resolved. Despite getting P300 and no specific cylinder misfire, I found a faulty coil pack. Checked resistance of all to find the faulty one. Car now sounds better than it ever has. Now time to get it back racing! Quote Link to comment Share on other sites More sharing options...
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