phil33 Posted February 9, 2014 Share Posted February 9, 2014 G'day guys, i just serviced my r33 93 gtst. standard service plugs filter n oil. put it back together and it sounds like its miss firing. iv tested the coil packs one by one and its seems they are ok cause every time i pull a plug off it miss fires worse. when under load it miss fires and spatters.? is this a sign of a dying coil pack.? any help would be much appreciated. Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/ Share on other sites More sharing options...
Ben C34 Posted February 9, 2014 Share Posted February 9, 2014 Could be a coil pack, more likely coil pack loom if problem only surfaced after you messed with it. Unless you put some gumby plugs in there Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7193656 Share on other sites More sharing options...
phil33 Posted February 9, 2014 Author Share Posted February 9, 2014 well check the loom. just checked the old plugs the last service i got done the dude has put BPR6E.. which are completely wrong. They are a lot thicker. could of those plugs stuffed the coil packs? new plugs installed are BCPR6ES. been trying to check the resistance on the coil packs but can't seem to find if Rb25DET S1 are the same as other RB coil packs and meant to be between 0.6 to 0.9? Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7193660 Share on other sites More sharing options...
Ben C34 Posted February 9, 2014 Share Posted February 9, 2014 wrong plugs won't damage the coils. Not sure in resistance, it also doesn't seem to be a good way of diagnosing coils anyway as heat makes a big difference. clean the boots and apply silicon grease and see if that helps. I think it's the loom though, they get heaps crusty due to the heat. Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7193706 Share on other sites More sharing options...
GTRPSI Posted February 9, 2014 Share Posted February 9, 2014 (edited) If its idling fine but missfiring under boost, close your plug gap down to 0.8mm first as a test.....im guessing you used the factory plug gaps....maybe check your old plug gaps and see what they were at, most people close the gaps to help stop on boost missfires. While there take a look around the coils for burn marks/arcing. If you see arcing marks around coils try wraping them in electrical tape as a temp fix till you change them. Also its good practice to use dielectric grease around the boot inner edge to help stop arcing through there too. Edited February 9, 2014 by GTRPSI Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7194215 Share on other sites More sharing options...
SkudR33 Posted February 9, 2014 Share Posted February 9, 2014 When I first bought my car, I forgot to change the spark plug gap and it cause the biggest and most retarded misfire. You sure you've gapped your plugs properly??? Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7194218 Share on other sites More sharing options...
phil33 Posted February 9, 2014 Author Share Posted February 9, 2014 hey guys plug gap is 11mm same as the old plugs. the plug cap shouldn't matter on a fully standard car only running standard boost. should it? also its coughing and farting on idle now then miss fires on free rev. i check coil packs n coil loom all wires are good. couldn't see any burn marks or arcing. man this is doing my head in. Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7194282 Share on other sites More sharing options...
GTRPSI Posted February 10, 2014 Share Posted February 10, 2014 Close the gap for a test, see what happens. If it works you might have a weak spark due to coils on their way out. Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7195282 Share on other sites More sharing options...
intercpt Posted February 11, 2014 Share Posted February 11, 2014 Get 0.8mm gapped plugs. I accidently bought the 1.1mm and car misfired bad in high rpms! Check all coil packs, connectors and the loom and spray with wd40. Reconnect everything and you should be good. Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7196079 Share on other sites More sharing options...
phil33 Posted February 11, 2014 Author Share Posted February 11, 2014 got 0.8 mm plugs, tapped up the coil packs, cleaned the connectors n loom. still running rough on idle a missing under load. i got a new fuel filter and noticed when i turn the key to acc the fuel pump stay on a lot longer then normal. even after i have tried to prime the lines 20 times.. :-/ any chance the pump is shitting itself. or is that the kind of thing that "it works or it doesn't." Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7196094 Share on other sites More sharing options...
Ben C34 Posted February 11, 2014 Share Posted February 11, 2014 see if the ecu has any error codes. Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7196254 Share on other sites More sharing options...
phil33 Posted February 13, 2014 Author Share Posted February 13, 2014 just checked the ecu's led has a solid red light all the time. no flashing. tried to find some info about but seems that it should flash if there is an error. Link to comment https://www.sau.com.au/forums/topic/438866-r33-miss-firing/#findComment-7198333 Share on other sites More sharing options...
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