supraman382 Posted March 25, 2009 Share Posted March 25, 2009 Apologies if this has been covered elsewhere, had a look at the search and all the other misfire problems happened at different times to mine... On start up when the engine is cold it's definitely running on 5/4 cylinders (sounding like a Subaru), the smoke from the exhaust is thick and the fuelling smells very rich. Then as the automatic choke lowers idle and the engine warms up its fine, drives with no problems. The first time was Last night and it did it again this morning, misfire only lasting for a minute or so.... Is it simply the start of the plugs going? Thanks Quote Link to comment Share on other sites More sharing options...
merckx Posted March 25, 2009 Share Posted March 25, 2009 Diagnostics check? Quote Link to comment Share on other sites More sharing options...
JustGav Posted March 25, 2009 Share Posted March 25, 2009 NA or TT? TT -> Could be a loose coil pack NA -> Water by the plugs? Quote Link to comment Share on other sites More sharing options...
supraman382 Posted March 25, 2009 Author Share Posted March 25, 2009 Its a TT...no engine warning lights/codes etc. Has been smelling rich for sometime on start up but idling has been healthy...coilpacks known to work themself loose? Quote Link to comment Share on other sites More sharing options...
JustGav Posted March 25, 2009 Share Posted March 25, 2009 Its a TT...no engine warning lights/codes etc. Has been smelling rich for sometime on start up but idling has been healthy...coilpacks known to work themself loose? Not the coil packs per say (but they do fail over time), but the two wires that connect them up have a habit of getting a bit brittle and the connector doesn't make a good contact. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 25, 2009 Share Posted March 25, 2009 (edited) Sounds like it would benefit from a clean of the IACV. Edit. Scrub that see lower posts. Edited March 26, 2009 by Tricky-Ricky (see edit history) Quote Link to comment Share on other sites More sharing options...
supraman382 Posted March 25, 2009 Author Share Posted March 25, 2009 Sounds like it would benefit from a clean of the IACV. Intake air control Valve?? Whats the best way of cleaning?? (hope thats not a silly question!) Quote Link to comment Share on other sites More sharing options...
wile e coyote Posted March 25, 2009 Share Posted March 25, 2009 I had this Fitted new plugs and seemed ok Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 25, 2009 Share Posted March 25, 2009 Intake air control Valve?? Whats the best way of cleaning?? (hope thats not a silly question!) Brake cleaner or something similar, just unbolt from the plenum, you can leave the water hoses in place, and you can still remove the valve and spacer. Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 26, 2009 Share Posted March 26, 2009 I'd like to hear how the idle air control valve can cause a misfire on one or two cylinders on cold start Have you got any fuelling modifications - AVCr, E-manage, aftermarket stuff etc.? Probably plugs though, how old are they, what type etc etc? -Ian Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 26, 2009 Share Posted March 26, 2009 I'd like to hear how the idle air control valve can cause a misfire on one or two cylinders on cold start Have you got any fuelling modifications - AVCr, E-manage, aftermarket stuff etc.? Probably plugs though, how old are they, what type etc etc? -Ian That will teach me to read the post fully:blush: No it definitely wont be idle control valve, could be a plug, or leaky injector, or injector driver stage in ECU or piggyback, but unlikely. Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 26, 2009 Share Posted March 26, 2009 I'm voting plugs. Quote Link to comment Share on other sites More sharing options...
Nic Posted March 26, 2009 Share Posted March 26, 2009 I'm voting plugs. Agree, most likely cause will be plugs, it would be the first thing I'd change. I'd replace all the coil pack connectors at the same and also fit 2 new breather hoses, as they are likely to split when you try to remove. If that doesn't solve the issue then next step would be to check the coil packs. Quote Link to comment Share on other sites More sharing options...
supraman382 Posted March 26, 2009 Author Share Posted March 26, 2009 Thank you for the info and advice chaps, I shall definately start with the plugs, they have been in for nearly 3 years and 9000 miles so wouldnt surprise me if thats all it is. No Ian the car is standard other than Blitz Nur spec..which is now thick black inside due to the smoke its been emmiting on start up.. Plugs are most likely OEM as it was imported 3 years ago and iv had to do nothing to it (other than oil and filter change)..which leads me onto my other question; I checked the coolant - well my dad did as im colour blind and red and brown are the colours i struggle with most - and all looks fine, along with transmission fluid and diff oil levels but as mentioned I have had it for 3 years and done 9k miles and technically not had a service...im a strong believer if its not broken then dont fix it..not sure if the car would still benefit from full 'fluid service'..especially if i look to sell as there is technically no UK service history.... any thoughts?? Thank you Nic, its a standard J spec TT, can you send my quote via PM for all you mentioned (plugs, connectors and breather hoses, and delivery to cornwall) thank you very much, also if the car I got a cooler grade of plugs with the intension of ever going BPU how wud that affect the running of the car having them fitted now?? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 26, 2009 Share Posted March 26, 2009 First off using one grade colder plugs when still completely STD will be OK but they will fowl up a lot quicker, so i would stick to STD for now. As for fluids, the first thing i did when i bought my Supra was to change and flush the cooling system, i was surprised at the amount of sediment that came out, which is one of the reasons i was put off the Toyota red for life antifreeze, which had been used previously, but not changed regularly. The gearbox and diff oil in theory should be fine, but depending on mileage, if the car has over 40K on it, then i would also change both. Apologies for the earlier misleading reply, i obviously wasn't paying attention, think i may have been thinking about another post wen i replied:senile: Quote Link to comment Share on other sites More sharing options...
supraman382 Posted March 26, 2009 Author Share Posted March 26, 2009 Haha thats ok mate, any advice is helpful at the moment! A standard grade of plugs it is then, any recommendations on make of coolant if not the red for life..and yes its on about 70k so I guess it wont harm to do the oils, im sure there are guides on here somewhere ...I dont know if there is any connection to the 'plug problem' but quite recently the wastegate/actuator has sounded a lot louder, not when under load but when stationary, and gently reving up to about 2k...it only did it after a fitted my new alternator and belt so im wondering if I have left anything loose.... wen it rains it pours eh?!! lol Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 26, 2009 Share Posted March 26, 2009 A lot of people swear by the Toyota stuff, and i dare say its fine when changed frequently enough, but any proprietary antifreeze is fine, i just object to paying Toyota prices, but then I'm tight:) Not sure just what you mean by "the wastegate/actuator has sounded a lot louder, not when under load but when stationary":blink: Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 26, 2009 Share Posted March 26, 2009 I use the Toyota stuff because it's a drop in the ocean compared to the other stuff you spend on the car, I think about £18 for a full load that lasts x years. But I do tend to re-use it if I drain it out and it's still fairly young, as I'm a different kind of tight Quote Link to comment Share on other sites More sharing options...
Nic Posted March 27, 2009 Share Posted March 27, 2009 Thank you Nic, its a standard J spec TT, can you send my quote via PM for all you mentioned (plugs, connectors and breather hoses, and delivery to cornwall) thank you very much, also if the car I got a cooler grade of plugs with the intension of ever going BPU how wud that affect the running of the car having them fitted now?? If standard then no need for exotic plugs, probably just as cheap to get them there once postage is added from here. See FAQ section here http://mkivsupra.net/vbb/showthread.php?t=41927 I can get the breather hoses and connectors but would need to order which would take a few weeks. They are cheap so you're probably better off getting from your local Toyota dealer in this case. These are the part numbers 6pcs 90980-11246 Coil Pack Connector 12264-46010 Breather Hose 1 12263-46010 Breather Hose 2 How to refurb the connectors http://mkivsupra.net/vbb/showthread.php?t=61141 Quote Link to comment Share on other sites More sharing options...
supraman382 Posted March 27, 2009 Author Share Posted March 27, 2009 Wonderful Nic thank you very much for your advice, thought that it would have been cheaper locally but like to keep members pockets lined as much as possible Hopefully bring you some business soon! Quote Link to comment Share on other sites More sharing options...
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