n00b Posted August 14, 2006 Share Posted August 14, 2006 hi all, sorry for my poor techno knowledge i have a problem with cylinders 3 and 6 not fireing. At first i thought it was the ht leads (tried swapping these about)/ plugs (i have put in new ones) or distributer (taken to bits and cleaned) but i have checked all these with new componments today (even checked the plug was sparking)... i have run out of ideas the engine sounds ruff turning over and you can pull leads 3 and 6 out of the distributor and it sounds exactly the same. oil and water levels are fine so i dont know what else to check. the only thing i did prior to the problem was change the coolant and flush the heater matrix. but i cant see how this would cause this problem. any help would be great n00b Quote Link to comment Share on other sites More sharing options...
Lucifer Posted August 14, 2006 Share Posted August 14, 2006 Checked plugs? Quote Link to comment Share on other sites More sharing options...
n00b Posted August 14, 2006 Author Share Posted August 14, 2006 yep... replaced them this morning ... also checked they where sparking... which has got me really confused Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted August 14, 2006 Share Posted August 14, 2006 Duff injectors? Unusual to have two go at once though... Quote Link to comment Share on other sites More sharing options...
Lucifer Posted August 14, 2006 Share Posted August 14, 2006 HMmm not what I read. Can you clear up wether it is actually getting spark or not? Quote Link to comment Share on other sites More sharing options...
n00b Posted August 14, 2006 Author Share Posted August 14, 2006 i have a guy coming around tonight to run a compression test... (far beyond my abilities) hopefully he will find something. i just wish it was something simple like ht leads... it just doesnt make sense Charlie Quote Link to comment Share on other sites More sharing options...
n00b Posted August 14, 2006 Author Share Posted August 14, 2006 HMmm not what I read. Can you clear up wether it is actually getting spark or not? its definately sparking i put a plug in the number 6 ht lead and held it with rubber plyers and watched it spark off the engine cover (while a friend turned it on) Charlie Quote Link to comment Share on other sites More sharing options...
geoffvalenti Posted August 14, 2006 Share Posted August 14, 2006 When you say it sounds rough turning over, does it sound even, or are there fast and slow bits to the rhythm? (probably not explained that all that well ) Quote Link to comment Share on other sites More sharing options...
n00b Posted August 14, 2006 Author Share Posted August 14, 2006 it sounds evenly rough ... like it misses on time everytime ... when you press the accelerator it misses on time with the engine accelerating.... when you get the engine up to high revs you cant notce it as much. Charlie Quote Link to comment Share on other sites More sharing options...
chilli Posted August 14, 2006 Share Posted August 14, 2006 I think he means before it starts up, is the cranking evenly. i.e. have all cylinders got compression, if not it may go fast momentarily given an uneven cranking... hope it is nothing serious like that, seems wierd if it was all ok and you just messed around with coolant. Any reason to suspect the head gasket before you serviced it, was it all running sweet? Quote Link to comment Share on other sites More sharing options...
n00b Posted August 14, 2006 Author Share Posted August 14, 2006 I think he means before it starts up, is the cranking evenly. i.e. have all cylinders got compression, if not it may go fast momentarily given an uneven cranking... hope it is nothing serious like that, seems wierd if it was all ok and you just messed around with coolant. Any reason to suspect the head gasket before you serviced it, was it all running sweet? im running a compression test tonight so hopefully that will find that out (i think) ... i dont recall the engine running fast after ignition. everything was runniing really well. the only reason i changed the coolant and flushed the heater matrix is that its approaching autumn and i didnt want to be cold again this winter (got to say the heating works a charm now ). Charlie Quote Link to comment Share on other sites More sharing options...
n00b Posted August 14, 2006 Author Share Posted August 14, 2006 it seems that the cyliders are not getting any fuel (from loooking at the new spark plugs). i have tested the connection to the injectors and they are fine (they are live and turn a bulb on) so that leaves me to belive it must be the injectors themselves ... going to remove the injector rail tomorrow so i can check they are pushing fuel out... hopefully thats it are new injectors expensive? thanks Charlie Quote Link to comment Share on other sites More sharing options...
n00b Posted August 15, 2006 Author Share Posted August 15, 2006 hi all, still having problems im afraid.. i have checked sparked plugs ... ht leads ... distributer ... and all injectors... there is sparks from plugs and the injectors are pumping petrol (checked tonight by removing ejectors and turning engine over) but cylinders 3 and 4 are still not working. i have made a recording of the sounds the engine makes at idle reving and ignition (see attached in real media player format.) http://www.charlesdavey.co.uk/images/supra/driver.amr idle reving and ignition recorded in drivers seat http://www.charlesdavey.co.uk/images/supra/engine.amr idle and reving recorded in engine bay i really dont know what to do next... im not even sure what to llok for nnext ... im going to try a garage but im scared of being ripped off. i really dont know where to turn as its my only car and im struggling to get to work untill i get the car running again... i cant seem to find anyone who has had the same problem with a n/a Charlie Quote Link to comment Share on other sites More sharing options...
andrew7 Posted August 15, 2006 Share Posted August 15, 2006 Noob It is possible to show a spark on the tests but still have breakdown under any load, i.e. when trying to run the engine... You could do with borrowing a different set of HT electrics and trying those just to be really sure.......80% of misfiring problems, especially a regular misfire, are electrical... Quote Link to comment Share on other sites More sharing options...
Pixelfill Posted August 15, 2006 Share Posted August 15, 2006 Are you a member of the AA, RAC or equivalent? Maybe one of their motorway patrolmen could identify what the problem is. If you are worried about "job creation" at a local garage, at least the patrolman would provide an impartial assessment. Mike Quote Link to comment Share on other sites More sharing options...
n00b Posted August 15, 2006 Author Share Posted August 15, 2006 hi i think i might invest in a new pair of ht leads to make sure im a member of the AA (as from last saturday)... wouldnt they mind if i said i broke down where the vehicle is kept currently? i was thinking they would tell me to go and jump or just tow it to some random garage/home? Charlie Quote Link to comment Share on other sites More sharing options...
n00b Posted August 15, 2006 Author Share Posted August 15, 2006 forgot to mention i tried swapping the ht leads with the cylinders that where fireing and i was still getting the misfire on 3 and 6. Quote Link to comment Share on other sites More sharing options...
geoffvalenti Posted August 16, 2006 Share Posted August 16, 2006 Did you ever do a compression test? If so what were the results? At the moment you seem to be presenting to us the perfect system. Obviously it's not otherwise it would run. Have you tried renewing the spark plugs? Personally I'd say it was very unlikey to be a sudden loss of compression on two non adjacent cylinders. As long as you're sure you've got fuel from the injectors, I'd be looking at the distributor cap, leads, plugs, rotor arm. It's got to be something fairly obvious if its a regular misfire (sorry can't play your recording to hear) I suppose that you've checked the firing order(153624, No 1 at front of engine) around the distributor cap (you haven't got leads 3 and 6 transposed;)) Just a long shot, re-reading your initial post, if all you really did was change the coolant and flush the heater, is it possible that you splashed water everywhere over the electrics of the engine? Have you tried removing the distributor cap and checking for moisture, inside it and in the plug lead holes? Shame you'rs so far away, otherwise I'm sure it wouldn't take long to at least diagnose the problem, if not fix it. Do things logically, don't just wildly hop from one bit of the engine to another. Start at one bit, say the distributor, and check all associated components right through to the spark plugs. If it helps, write down what you've done, as you do it, so you know exactly how far you've got in case of interruptions Good luck with it, it's sure to be something minor, so don't ignore any possibility, no matter how unlikely. Quote Link to comment Share on other sites More sharing options...
n00b Posted August 19, 2006 Author Share Posted August 19, 2006 Fixed /vbb/images/smilies/bbcode_grin.gif :yahoo: :yahoo: :yahoo: :yahoo: ended up dodgy connections Quote Link to comment Share on other sites More sharing options...
n00b Posted August 19, 2006 Author Share Posted August 19, 2006 got to say since its fixed... i dont think it feels sooo much faster and acceleration is improved by huge amounts... must have been dodgy for a while and atleast i have had a compression test done now and i know thats all A ok thanks guys n00b Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted April 27, 2007 Share Posted April 27, 2007 Sorry for resurrecting an old thread, but I've got a mild misfire on idle, which seems to go away under throttle. When you said 'dodgy connections', which connections did you mean? (I'm a complete idiot when it comes to engines, so I like to have idiot-proof details for passing on to my mechanic!) Quote Link to comment Share on other sites More sharing options...
n00b Posted April 27, 2007 Author Share Posted April 27, 2007 well in my case it was the dizzy cap was cracked and so when the arm spun inside it was not meeting the ht leads so was not causing a current to the spark plugs... I don't think I can help you as you have a TT? and they don't have a different system maybe someone with a tt can help as I don't know anything about those engines ..... sorry im no use Charlie Quote Link to comment Share on other sites More sharing options...
Class One Posted April 27, 2007 Share Posted April 27, 2007 Sorry for resurrecting an old thread, but I've got a mild misfire on idle, which seems to go away under throttle. When you said 'dodgy connections', which connections did you mean? (I'm a complete idiot when it comes to engines, so I like to have idiot-proof details for passing on to my mechanic!) When you say misfire at idle, do you mean it kind of misses a beat occasionally? This is normal behaviour as the car is in closed loop and just does it. Nowt to worry about. Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted April 27, 2007 Share Posted April 27, 2007 Well, it's occasionally very lumpy on idle. If left in gear, e.g. when waiting at the lights, the whole car seems to vibrate. I wouldn't have thought much of it (since the car goes fine), but this has really only appeared in the last couple of weeks. Quote Link to comment Share on other sites More sharing options...
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