Guest supramad Posted January 7, 2008 Share Posted January 7, 2008 hi guys hope you can help me with this one i am a mechanic and bought this supra cheap after falling in love with it and previouse owner was that pissed of with not being able to fix it, wen cold its great it will rev clean into the red line but after 10mins of running it develops a really bad missfire wen revving over 2500rpm will run like this for 20mins then stop leave it to cool down for 10 and it will start but still miss any ideas? i have changed plugs,leads,dizy cap and rotor arm. i have got a test light wired imbetween dizzy cap and no1 plug its definatly loosing spark any ideas please because im starting to fall out of love now!!!!!!!!!!!!!!!!!! Link to comment Share on other sites More sharing options...
Dazzi Posted January 7, 2008 Share Posted January 7, 2008 What plugs have you put in Iridium? (model number) etc? and where abouts are you in North Yorks Link to comment Share on other sites More sharing options...
Guest supramad Posted January 7, 2008 Share Posted January 7, 2008 hi there i put NGK irridium (poor spelling!) plugs in it i am just outside selby its a grey import if the matters i just really bought it so haven't got v5 back yet, but my loss of spark is coming from the dizzy as my test light is straught off back of dizzy to plug one? Link to comment Share on other sites More sharing options...
Dazzi Posted January 7, 2008 Share Posted January 7, 2008 Hi, Did you gap your iridiums? Spark might not be at its peak if not. Some info: Normally Aspirated NGK - Standard - BKR5ES-11 (2382) - gap 1.1mm NGK - V-Power - BKR5EYA-11 (2526) - gap 1.1mm NGK - G-Power Platinum - BKR5EGP (7090) - gap 1.1mm NGK -Laser Platinum - BKR5EP-11 ( 3440) -gap 1.1mm NGK -OE Laser Iridium - IFR5T11 (4996) - gap 1.1mm NGK - Iridium IX - BKR5EIX-11 (5464) - gap 1.1mm Denso Platinum - PK16R11 - gap 1.1mm Im over in Ripon btw Also you put you spark leads the on right way? I.E Spark plug 1 with lead 1? - Just tryin to get an idea... Been a few on here that were misfiring because the leads got mixed up Link to comment Share on other sites More sharing options...
Guest supramad Posted January 7, 2008 Share Posted January 7, 2008 yer i hear what your saying but i bought car with this fault from cold i could sit it on limmiter and its no problem but just let it warm up for ten and this prolem creeps in it not a static fault, in my mind it is something like the dizzy itself coil pack or ignition amp as they warm up and break down? but not having a lot to do with these i don't know if this is common and were to get parts if so cheers. Link to comment Share on other sites More sharing options...
Dazzi Posted January 7, 2008 Share Posted January 7, 2008 Ah, might be some kind of fueling issue but not certain. Andy Hannah from Miami-GT (a member on here) lives in Selby, hes knows a lot, drop him a pm and he might be able to look at it for you. Link to comment Share on other sites More sharing options...
Guest supramad Posted January 7, 2008 Share Posted January 7, 2008 any one else got any ideas? Link to comment Share on other sites More sharing options...
supra-lover Posted January 7, 2008 Share Posted January 7, 2008 Yeah Buy My Engine Link to comment Share on other sites More sharing options...
Guest supramad Posted January 7, 2008 Share Posted January 7, 2008 thanks but compressions fine not a mechanical fault its electral spark wise? Link to comment Share on other sites More sharing options...
Dazzi Posted January 7, 2008 Share Posted January 7, 2008 Try disconnecting the battery for 10 mins when you get a chance. This resets the ECU. Once this happened to me, the car was purring bumbumbumpopbumbum - a very light popping sound every 10 seconds or so. This went away by accident when I disconnected the battery to fit my new sped dials. Give it a try Link to comment Share on other sites More sharing options...
Guest supramad Posted January 7, 2008 Share Posted January 7, 2008 cheers for help if anyone spots this and has had same problem would really like to hear from you thanks hor help so far. Link to comment Share on other sites More sharing options...
Scooter Posted January 7, 2008 Share Posted January 7, 2008 Its very rare to hear NA's having such problems.......... It you search on here for how to read error codes i have a toyota manual i could look up the code and it will have a series of likely causes and action to take to investigate further. Actually to save you time here's the link to how to obtain the error codes............. http://www.mkivsupra.net/vbb/showthread.php?t=35920&highlight=checking+error+codes Link to comment Share on other sites More sharing options...
dini_the_owl Posted January 7, 2008 Share Posted January 7, 2008 i had this on my n/a once and it turned out to be the small black coil from the distributor, infact i may have my replaced one still here somewhere which you could try and illiminate that anyway? must have been braking down somehow, and i went through all the obvious things before i found the bugger! Link to comment Share on other sites More sharing options...
Wez Posted January 8, 2008 Share Posted January 8, 2008 from cold i could sit it on limmiter and its no problem Link to comment Share on other sites More sharing options...
Sean1933 Posted January 8, 2008 Share Posted January 8, 2008 Have you tried it without the the O2 sensors connected, could be faulty as once its warm it tries to go into closed loop where the sensor comes into play...thus a faulty signal causes over/under trimming of the fuel map. If you have had no success with the above then its probably spark related as you say. Is it one cylinder missing or random ones? Link to comment Share on other sites More sharing options...
Guest cj748 Posted January 8, 2008 Share Posted January 8, 2008 As a "general" rule in car mechanics, I have found that if you have ignition problems when the engine is warm, then it is usually the coil or distributor to blame. Try the reset on the battery, hope it works. If not try working through the list of possible suspects based on sequence and of course price! ie: coil before distributor. Good luck. Any further info may help us narrow other possible sources. Link to comment Share on other sites More sharing options...
Guest supramad Posted January 8, 2008 Share Posted January 8, 2008 cheers guys thanks for all the ideas i will try to explain a bit more from what you have told me, i have been working on it tonight and have got test lights in line on the plug leads and the missfire is sporadic it does get a lot worse the harder you rev it then it starts to spit back in to the air box and eventually stop. The three items to me i think could be giving me trouble are the ignition amplifier, the coil or the destributer, personally i think it's the dizzy becaouse that seems most affected by heat? a small black box was mentioned before more info on that would be great, all this info is really appriciated if im not clean on anything just say and il try to explain a bit better. cheers:) Link to comment Share on other sites More sharing options...
Scooter Posted January 8, 2008 Share Posted January 8, 2008 have you tried to get the diagnostic/trouble code? Link to comment Share on other sites More sharing options...
Guest supramad Posted January 8, 2008 Share Posted January 8, 2008 yes it says there arn't any in it but im not 100% sure if its working properly it seems to only work when it feels like it not every time i link it up? Link to comment Share on other sites More sharing options...
Scooter Posted January 8, 2008 Share Posted January 8, 2008 shame as i've got the toyota manual but there's loads of info........... i've had a look and going on your hunch there is a section that may be a possibility? It has a table of resistances (and has a HOT and cold reading) that should be present between the terminals off the electrical loom connector to the distributor (faces you when stood in front of the engine) When disconnected the part still attached to the distributor has 4 terminals referenced as follows NE G1 G2 G- (its not 100% which side/end of the terminal NE or G- is, but this is the order from one side/end to the other) Resistance between G1 (pickup coil) and G- Cold 125-200ohms Hot 160-235 ohms G2 (pickup coil) and G- reading as above NE (pickup coil) and G- Cold 155-250 ohms Hot 190-290 Ohms If they are outside these ranges the 'book' says replace distributor..... btw this is for error code 12 (one flash and 1.5 secs after two flashes) hope you sort it............ Link to comment Share on other sites More sharing options...
dini_the_owl Posted January 8, 2008 Share Posted January 8, 2008 you may well not get an error code for this type of issue! Link to comment Share on other sites More sharing options...
Guest supramad Posted January 8, 2008 Share Posted January 8, 2008 thats great il check that out tommorow had enough tonight cheers for this data i am really impressed i can't get any of my normal contacts to give me any help just because its an import! i will update tommorow and double fingers crossed it will be good news! thank again:) Link to comment Share on other sites More sharing options...
Sean1933 Posted January 9, 2008 Share Posted January 9, 2008 Sounds like a distributor issue, too much resistance causing a weak spark. Is there nobody in the area with an NA you can swap parts on just to test, makes it ALOT easier...and cheaper Link to comment Share on other sites More sharing options...
dini_the_owl Posted January 9, 2008 Share Posted January 9, 2008 i should be able to help out,if you wanna try some bits Link to comment Share on other sites More sharing options...
Sean1933 Posted January 9, 2008 Share Posted January 9, 2008 i should be able to help out,if you wanna try some bits Well done that man Link to comment Share on other sites More sharing options...
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