Guest davet Posted March 7, 2007 Share Posted March 7, 2007 Hello everyone, I was getting a few misfires when booting it and going above 4000 rpm. the car would still accelerate but misfire roughly every three quarters of a second. I took it in for service and my garage found out that Toyota from their last service had not done a full spark plug change as they said they had but had left 2 old ones in and replaced the rest with new as it was a bit of a bugger to get to two of them. My garage eventually managed to get these out and replace all with some new NGK ones. Now though when i go above 4000RPM i'm getting constant misfires. The garage reckons it's probably a damaged coil pack which needs replacing. I'm taking it in on saturday to have some tests. Does this sound correct? Also does anyone know where I can get my hand on a replacement coil pack easily enough? The garage has quoted me about £85 for one but says I can source one if I want to. It's sods law this has happened just when I'm trying to sell it! Thanks everyone Dave Link to comment Share on other sites More sharing options...
Thorin Posted March 7, 2007 Share Posted March 7, 2007 If the plugs are the correct temperature range and gap then yes I'd say it's more than likely dodgy coil packs or connectors. Quite common now with age. Is there someone local who would be willing to let you swap coil packs over to test before you stump up the cash for some? Link to comment Share on other sites More sharing options...
JustGav Posted March 7, 2007 Share Posted March 7, 2007 Is it an NA? I'm guessing that since you said they have left two in? EDIT: Ignore me, I've just spotted a previous thread saying you had a UK TT. Link to comment Share on other sites More sharing options...
jamesmark Posted March 7, 2007 Share Posted March 7, 2007 For sparks I don't think you need any gapping, i think it is only over BPU that you need to gap the sparks. Link to comment Share on other sites More sharing options...
jamesmark Posted March 7, 2007 Share Posted March 7, 2007 Or infact have a look here is Alex's thread some need a gap and some don't depends on the plug and how modded the car is http://www.mkivsupra.net/vbb/showthread.php?t=41927 Link to comment Share on other sites More sharing options...
Marco Posted March 7, 2007 Share Posted March 7, 2007 I've got a similar problem. Greg at turbofit said it was probably the actuator for the 2nd turbo, think he called it boost flutter - so it's not misfiring but feels like it... Coilpacks and plugs were fine, they've checked them. Link to comment Share on other sites More sharing options...
Guest davet Posted March 7, 2007 Share Posted March 7, 2007 Did you get the actuator fixed or a quote for it? Cheers Dave Link to comment Share on other sites More sharing options...
Marco Posted March 7, 2007 Share Posted March 7, 2007 Not yet fixed and no quote. Link to comment Share on other sites More sharing options...
bodilx6 Posted March 7, 2007 Share Posted March 7, 2007 I expirienced exactly the same. new plugs fitted by toyota though. But when the second turbo comes online, it just started fluttering and sounding like shit. No real pull either. I'm guessing you are BPU? This happens since Toyota fitted plugs after what they new was the right for a standard soop. But after BPU you need other plugs. Standard plugs got a gap of 1 mm. Running BPU you need something like ,5 mm gap. I got toyota to hammer a bit on them to reach ,5 mm and that fixed the problem. Now I have misfire now and then when running idle, but only in idle and it is just now and then. It's probably down to them manually setting the gap. Best way would be to get the rigth plugs from the start. Ï'm sure you can search and find the best plugs for a BPU here on the forums. Link to comment Share on other sites More sharing options...
Guest davet Posted March 7, 2007 Share Posted March 7, 2007 yeah i'm hoping thats the problem too as I know the garage had a problem fitting a couple of them. I'll keep you all updated but thanks everyone for the quick response. I love you guys Dave Link to comment Share on other sites More sharing options...
RedM Posted March 7, 2007 Share Posted March 7, 2007 Toyota not doing a full job. That'll be a first! I was charged for a full brake fluid swap. It was tested three months later and my mechanic reckoned it was at least two years old. Link to comment Share on other sites More sharing options...
Ian C Posted March 7, 2007 Share Posted March 7, 2007 I've got a similar problem. Greg at turbofit said it was probably the actuator for the 2nd turbo, think he called it boost flutter - so it's not misfiring but feels like it... Coilpacks and plugs were fine, they've checked them. Which actuator was that? -Ian Link to comment Share on other sites More sharing options...
Marco Posted March 7, 2007 Share Posted March 7, 2007 Which actuator was that? -Ian The one that makes the 2nd turbo come online... Link to comment Share on other sites More sharing options...
Ian C Posted March 7, 2007 Share Posted March 7, 2007 Well there is one that lets it spin up and one that lets it send it's compressed air out to the engine. Failure modes of either cause different behaviour, none of which I know of so far act like a misfire, hence me asking... -Ian Link to comment Share on other sites More sharing options...
Suprasteve Posted March 7, 2007 Share Posted March 7, 2007 I'm putting my money on incorrect or dated spark plugs. I went BPU a year or so back and had that exact same problem, i fitted the correct plugs which sorted it. A year later the same problem, got the plugs changed -> problem solved. refer to Alex's list of plugs and do it yourself its piss easy. (and thats coming from a paper pushing office worker) Link to comment Share on other sites More sharing options...
Marco Posted March 7, 2007 Share Posted March 7, 2007 Well there is one that lets it spin up and one that lets it send it's compressed air out to the engine. Failure modes of either cause different behaviour, none of which I know of so far act like a misfire, hence me asking... -Ian I'll let you know when it's fixed Link to comment Share on other sites More sharing options...
Guest davet Posted March 7, 2007 Share Posted March 7, 2007 Me too, the cars back in on saturday Dave Link to comment Share on other sites More sharing options...
Sheefa Posted March 8, 2007 Share Posted March 8, 2007 Well there is one that lets it spin up and one that lets it send it's compressed air out to the engine. Failure modes of either cause different behaviour, none of which I know of so far act like a misfire, hence me asking... -Ian Ian, Greg @ Turbofit mentioned that an actuator problem may cause my number 2 tubbie to intermittantly come online and not boost correctly to 1.2 bar. I'm only running at 0.76-0.9 for some reason and there don't appear to be any boost leaks and I've replaced the Boost Controller solenoid. Could this be a potential cause of a faulty actuator spring? Thanks Greg Link to comment Share on other sites More sharing options...
tDR Posted March 8, 2007 Share Posted March 8, 2007 I expirienced exactly the same. new plugs fitted by toyota though. But when the second turbo comes online, it just started fluttering and sounding like shit. No real pull either. I'm guessing you are BPU? This happens since Toyota fitted plugs after what they new was the right for a standard soop. But after BPU you need other plugs. Standard plugs got a gap of 1 mm. Running BPU you need something like ,5 mm gap. I got toyota to hammer a bit on them to reach ,5 mm and that fixed the problem. Now I have misfire now and then when running idle, but only in idle and it is just now and then. It's probably down to them manually setting the gap. Best way would be to get the rigth plugs from the start. Ï'm sure you can search and find the best plugs for a BPU here on the forums. This is rubbish. Standard plug gap is 1.1mm. You don't run anything like 0.5mm gap - the smallest gap you need to go to with non iridium plugs (these are pre gapped) at BPU level is 0.9mm. I'd hate to see anyone 'hammer' their spark plugs too. The gap between the electrode and ground electrode should be carefully set using a set of feeler gauges and a solid flat surface to adjust with light taps. You have a misfire at idle because you are running incorrectly gapped plugs and if it was Toyota they are no doubt of incorrect grade if you are at BPU level. Going back to the thread starter's problem, Dave if you are running increased boost at around BPU level of modification you want to be running 1 grade colder spark plugs with a smaller than standard gap. This should be your first port of call when diagnosing a misfire before exploring more expensive options like coil packs. The plugs on a TT are easy to change and can be done DIY in 30 mins - I recommend you fit NGK BKR7E's gapped to 0.9mm, these plugs are available at all motor factors for around £10 for a set of 6. Cheers, Brian. Link to comment Share on other sites More sharing options...
Suprasteve Posted March 8, 2007 Share Posted March 8, 2007 This is rubbish. Standard plug gap is 1.1mm. You don't run anything like 0.5mm gap - the smallest gap you need to go to with non iridium plugs (these are pre gapped) at BPU level is 0.9mm. I'd hate to see anyone 'hammer' their spark plugs too. The gap between the electrode and ground electrode should be carefully set using a set of feeler gauges and a solid flat surface to adjust with light taps. You have a misfire at idle because you are running incorrectly gapped plugs and if it was Toyota they are no doubt of incorrect grade if you are at BPU level. Going back to the thread starter's problem, Dave if you are running increased boost at around BPU level of modification you want to be running 1 grade colder spark plugs with a smaller than standard gap. This should be your first port of call when diagnosing a misfire before exploring more expensive options like coil packs. The plugs on a TT are easy to change and can be done DIY in 30 mins - I recommend you fit NGK BKR7E's gapped to 0.9mm, these plugs are available at all motor factors for around £10 for a set of 6. Cheers, Brian. agreed. kinda what i said but looks like it went unnoticed Link to comment Share on other sites More sharing options...
Guest davet Posted March 16, 2007 Share Posted March 16, 2007 aha it's fixed! The garage had put the wrong spark plugs in. Everything's working no probs now they've been changed / upgraded. Thanks for everyone's ideas Dave Link to comment Share on other sites More sharing options...
Sheefa Posted March 16, 2007 Share Posted March 16, 2007 Good work Dave. If only mine was fixed too Link to comment Share on other sites More sharing options...
Marco Posted March 27, 2007 Share Posted March 27, 2007 Just a quick update. It was the coil towers that didn't work anymore. They have been replaced and the car is running great again! Thanks to all at Turbofit! :) Link to comment Share on other sites More sharing options...
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