Guest caldoofy Posted October 17, 2008 Share Posted October 17, 2008 Hi all, I recently developed a heavy misfire on my na supe it is audible on tick over and really does become apparent from 1200 to 2600 rpm kangarooing and sounding like its runnin on 3 cylinders! After the 2600 rpm point it seems to completely disappear and the car takes off! wondering if anyone had any ideas as to cause ive changed the plugs, leads, dissy cap and rotor arm cleaned all the plugs i could find with wd40 but nothin seems to work is there something im missing? Any help greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Rob Dublin Posted October 17, 2008 Share Posted October 17, 2008 O2 sensor? Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted October 17, 2008 Share Posted October 17, 2008 have you washed the engine bay lately? Quote Link to comment Share on other sites More sharing options...
Konrad Posted October 17, 2008 Share Posted October 17, 2008 have you washed the engine bay lately? This one have copyrights! It supposed to be asked by JustGav Quote Link to comment Share on other sites More sharing options...
Guest caldoofy Posted October 17, 2008 Share Posted October 17, 2008 No i havent cleaned it but ive cleaned the gulley where the plugs sit anyway cause there was looked like sand in there!! so it isnt the water by the plug problem. would the o2 sensor cause this sort of fault? Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted October 17, 2008 Share Posted October 17, 2008 This one have copyrights! It supposed to be asked by JustGav Didn't realise, sorry:) just remember an american supra site where loads of people where complaining of misfires after washing their engine bays but they were all N/A's and the TT guys where taking the pi55 out of them, was funny! i believe the most common description was that the engine sounded like a subaru instead of a smooth 6 cylinder. Quote Link to comment Share on other sites More sharing options...
rick001 Posted October 18, 2008 Share Posted October 18, 2008 just my 2 pennies worth but i had this when i changed my plugs on my n/a - root cause was the plugs were not tight in the chamber and worked loose causing misfire -- just a thought Quote Link to comment Share on other sites More sharing options...
Multics Posted October 18, 2008 Share Posted October 18, 2008 Dizzy rotor? HT leads? Common cause of misfiring on the NA's. Quote Link to comment Share on other sites More sharing options...
Dazzi Posted October 18, 2008 Share Posted October 18, 2008 o2 sensors won't cause a heavy misfire like this. My misfire was due to the HT leads, one of the clips came off when I removed it and wasn't firing. Quote Link to comment Share on other sites More sharing options...
Daston Posted October 18, 2008 Share Posted October 18, 2008 I had this on mine when I put the waterpump and dizzy back on. I thought I had buggered the timing up and it turned out to be something on the fuel injection side. Might be worth having a look that side. Quote Link to comment Share on other sites More sharing options...
JustGav Posted October 18, 2008 Share Posted October 18, 2008 This one have copyrights! It supposed to be asked by JustGav Hahahaha, it usually is the case though when someone washes the engine bay down, it is about time it wasn't that issue for a change Quote Link to comment Share on other sites More sharing options...
Guest caldoofy Posted October 19, 2008 Share Posted October 19, 2008 yeah doin my head in this problem, what was it on the injection side dazzi? HT leads rotor and cap have al been changed for new ones s could prob eliminate that. One suggestion was the advance and retard is not getting a good signal from the crank and cam sensors? after the magic 2600 this system is redundant hence the car taking off after that speed? make sense to anyone? cheers for the help so far :-) Quote Link to comment Share on other sites More sharing options...
Dazzi Posted October 19, 2008 Share Posted October 19, 2008 (edited) What does the car idle at once warm? Have you checked all cylinders are firing? Also what spark plugs have you installed and have you inspected them for rich/lean mixture and also if oil is present on the tip? Edit, just to add what is your crank set at? TDC? 10d BTDC etc? have you tried a timing light to see? Edited October 19, 2008 by Dazzi (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest caldoofy Posted October 20, 2008 Share Posted October 20, 2008 car idles bout 800 rpm when its warm the idle hasnt really been affected you can hear the misfire when its idling but only slightly, havent checked the timing as yet, plugs are platinum ngks when i took them out there was no oil on any of them all were dark grey in colour electrode was white. Its as though one cylinder is down but keeps comin back to life so thats why i thought connections initially but now everything on that part of it from dissy to plugs is new!!? So am at a loss! Comin off the road for winter anyways but would be nice to get this sorted before it does. Quote Link to comment Share on other sites More sharing options...
Dazzi Posted October 20, 2008 Share Posted October 20, 2008 Have you compression tested all cylinders? Might be worth a go. Quote Link to comment Share on other sites More sharing options...
JustGav Posted October 20, 2008 Share Posted October 20, 2008 Have you tried the old fashion spark plug test, get a spare one and put it on each HT lead in turn and check you are getting a spark. (Hold each one to head WITH a pair of pliers) Changed the HT pack? Quote Link to comment Share on other sites More sharing options...
Guest caldoofy Posted January 5, 2009 Share Posted January 5, 2009 right just gone back to the car after my winter break and the problem still exsists i have changed the coil aswell but no luck. any other ideas on this people? cheers for your help in advance and a happy new year to everyone. Quote Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted January 5, 2009 Share Posted January 5, 2009 Coil? or do you mean coilpack? Quote Link to comment Share on other sites More sharing options...
D8MOA Posted January 5, 2009 Share Posted January 5, 2009 plugs leads cap/arm sticky injector? coil Quote Link to comment Share on other sites More sharing options...
Guest caldoofy Posted January 6, 2009 Share Posted January 6, 2009 i have changed the plugs, leads, dissy cap and rotor arm as well as fitting a new coil pack, how would you check for a sticky injector? cheers for the help so far. Quote Link to comment Share on other sites More sharing options...
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