harryww89 Posted July 30, 2018 Share Posted July 30, 2018 Hi Guys, Car has been giving me a headache this weekend with an intermittent misfire on right hand turns and vertical inputs (Bumps) under load conditions. This prevented me running at TOTB this Sunday after the issue started on the sprint track on Saturday. I'm wondering if anybody has seen this issue before? There is no issue with the car running on a smooth surface in a straight line on WOT, the issue is also not weather dependent from what I can gather. To confirm; Fuel Pressure is okay / Full tank of fuel was used on track Coilpack clips / Coils / Sparkplugs are all new No Boost leaks No Blockages on inlet or exhaust side Timing has not moved and remains set Boost Controller and Vacuum lines are okay I'm starting to think I have a dodgy ground or electrical connection but I'm yet to investigate. Any ideas on what else to look out for before I start doing an 8D and IS / IS NOT would be appreciated. Thanks Harry Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 30, 2018 Share Posted July 30, 2018 Check the ecu pins . Oil can sometimes pass down the wiring loom from the cam position sensor making a bad electrical connection Quote Link to comment Share on other sites More sharing options...
rider Posted July 30, 2018 Share Posted July 30, 2018 IF you didn't change the coil clips when you changed the packs and they are still original then they can disintegrate where the leads enter the clip which could allow some lateral terminal movement. Other than that I'd look to swap out the igniter with someone else in Yorkshire to see if that solves the problem. After that the cam and crank position sensors can lead to missfire occurring. Check the leads and connector integrity are good with those. Then it could be a dirty MAF sensor leading to running lean under load. If you have a decent multi-meter you can test the sensors are functioning. I'd take a punt your problem is going to be a dodgy position sensor signal. Quote Link to comment Share on other sites More sharing options...
harryww89 Posted July 31, 2018 Author Share Posted July 31, 2018 Thanks for the replies chaps, I have a feeling it could be sensor/electrical connected on the basis it's intermittent, i'll take a look across the sensors with a multimeter and let you know if i find anything. Quote Link to comment Share on other sites More sharing options...
SupraTRD_MK4 Posted July 31, 2018 Share Posted July 31, 2018 Harry is your engine vvti or non vvti? Std ecu or not? Quote Link to comment Share on other sites More sharing options...
harryww89 Posted July 31, 2018 Author Share Posted July 31, 2018 Harry is your engine vvti or non vvti? Std ecu or not? Non VVTI - Mines ECU with HKS FCON V Pro Gold 3.24 Quote Link to comment Share on other sites More sharing options...
Ozy1986 Posted August 2, 2018 Share Posted August 2, 2018 Hi mate. My car was misfiring really bad. It was the o2 sensor. Try and borrow one to check it. Quote Link to comment Share on other sites More sharing options...
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