listy Posted March 19, 2013 Share Posted March 19, 2013 (edited) JSpec NA-TT When accelerating sometimes the supra will kangaroo hop at 2000rpm, if I lift off and go again, it tends to sort itself out, but not all the time. This happens in 2nd, 3rd and 4th. As I said, its not all the time, so I'm thinking something is sticking somewhere. It's almost like its in limp mode. Sometimes it also idles a bit rough, dropping really low, and borders on stalling, but never quite gets that far. Could it be a sticky ICV? Any other opinions? Really want it sorted before JapFest. Edited April 8, 2013 by listy (see edit history) Quote Link to comment Share on other sites More sharing options...
Graham1984 Posted March 19, 2013 Share Posted March 19, 2013 Hopefully you get this sorted mate Quote Link to comment Share on other sites More sharing options...
tomgeer Posted March 19, 2013 Share Posted March 19, 2013 Try cleaning the 02 sensor, check vsv's, coilpack clips, fcd maybe? Quote Link to comment Share on other sites More sharing options...
listy Posted March 19, 2013 Author Share Posted March 19, 2013 No FCD, but I'll check O2 sensor and coil pack clips next week as I'm off work then. Not sure how to check vsv's but I'll have a search. Cheers for the suggestions Quote Link to comment Share on other sites More sharing options...
tomgeer Posted March 19, 2013 Share Posted March 19, 2013 No FCD, but I'll check O2 sensor and coil pack clips next week as I'm off work then. Not sure how to check vsv's but I'll have a search. Cheers for the suggestions Its at the bottom of the page on this link http://www.max-boost.co.uk/max-boost/supra/turbo.htm Quote Link to comment Share on other sites More sharing options...
listy Posted March 19, 2013 Author Share Posted March 19, 2013 Where is the vsv in the bay? From the link I can see its turbo side, is it easily accessible without silly amounts of work? After reading the vsv description, it sounds like it may well be the culprit, as when it "hops" it's kind of like the engine is struggling to breath, so kind of fits with the vsv maybe sticking closed. Hopefully it will be a simple fix If anyone around the Bristol/South Wales area wants to come and give me a hand next week, the misses makes a good brew, and has started baking cakes (and they are GOOOOOOOOD ) Thanks for the link dude Quote Link to comment Share on other sites More sharing options...
tomgeer Posted March 19, 2013 Share Posted March 19, 2013 Where is the vsv in the bay? From the link I can see its turbo side, is it easily accessible without silly amounts of work? After reading the vsv description, it sounds like it may well be the culprit, as when it "hops" it's kind of like the engine is struggling to breath, so kind of fits with the vsv maybe sticking closed. Hopefully it will be a simple fix If anyone around the Bristol/South Wales area wants to come and give me a hand next week, the misses makes a good brew, and has started baking cakes (and they are GOOOOOOOOD ) Thanks for the link dude Photo's here, good luck. http://www.mkivsupra.net/vbb/showthread.php?35926-The-sequential-system Quote Link to comment Share on other sites More sharing options...
listy Posted March 19, 2013 Author Share Posted March 19, 2013 Problem 4: I can't get any boost on the first turbo, it oscillates around a low boost pressure. A rare one this, your IACV is stuck open, and every time turbo #1 makes boost it takes pretty much the easiest way out - via the non-spinning 2nd turbo and back out to the air filter. It's like Problem 2 but happens all the time, not just at the transition point. This sounds like my problem, which is maybe why I couldn't find anyone else with the same problem when I searched for it. Thanks for the help mate, seems like I should be able to get it sorted pretty easily, be it a hose (have checked, but may have missed something) or a new IACV/second hand from Keron. Quote Link to comment Share on other sites More sharing options...
listy Posted March 20, 2013 Author Share Posted March 20, 2013 I have had a look at the IACV and both hoses are in tact and in good condition. Could it just be sticking? If so, how can I fix that? Or is it a new/refurbed/second hand IACV? Also, I have noticed my throttle cable is slightly loose. Could this cause the same symptoms? Quote Link to comment Share on other sites More sharing options...
listy Posted March 20, 2013 Author Share Posted March 20, 2013 Tightened the throttle cable, its still a little slack, but cant go any tighter, is that the way it should be? I also noticed a slight clicking (not tapping) noise from under the Spark Plug Cover.....is this a tell tale sign that my problem may be coil pack / coil pack clips related? Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted March 20, 2013 Share Posted March 20, 2013 Anything is possible mate, it gets to be a process of elimination sometimes. But certainly if the is a poor connection to a sparkplug resulting in a weak spark in one or more cylinder then I can imagine there might be no or poor ignition/combustion in the chamber when the boost starts to increase. Just out of curiosity, has the fuel filter and pump been eliminated from the list of possible suspects, or are you just starting at the front and working your way rearwards? Quote Link to comment Share on other sites More sharing options...
listy Posted March 20, 2013 Author Share Posted March 20, 2013 Starting at the front mate. From the link TomGeer posted, it suggested the IACV being stuck open, but dont know if they are easily "unstuck" or if it requires a replacement? Also, as a bit more info on the problem, the 1st turbo boosts to around 6psi and then it gets groggy. It feels as though the engine is struggling to breathe, which also makes me still think it may be a sticky IACV, as air is being forced back towards the air filter, (from the linked thread) which would make perfect sense to how the car feels when it happens. It was happening a while ago too, but then sorted itself out, and now its happening again, also pointing towards something sticking I guess. Is it normal to hear a feint clicking from the spark plug area? Is it just the plugs sparking? You have to listen carefully for it, just something ive never noticed before, but this is the first time I've had my ear that close to that part of the engine as far as I can remember. Fuel pump is something I want to upgrade to a Walbro anyway (gives me an excuse for the misses I guess:)) and fuel filter is an easy one to change, but dont want to be buying things I don't need right now, as I have a few things going on at the moment. I hate seeing her poorly Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted March 20, 2013 Share Posted March 20, 2013 The clicking could even be the injectors, running perfectly normally. Probably only noticed it now because you are looking for problems. I'd concentrate on what you have a feeling it might be first, I'm not familiar with any of that componentry myself so can offer no useful tips. Quote Link to comment Share on other sites More sharing options...
listy Posted March 20, 2013 Author Share Posted March 20, 2013 Thats good to know then, it is a very regular click, not intermittent, so thought it was ok, but thought I'd check anyway Thats the plan mate really, if I can refurb/unstick the IACV (if that is the problem) then all is good. If it's not the problem, I'll move on to coil packs, and clips, plugs, then fuel pump and filter. Quote Link to comment Share on other sites More sharing options...
listy Posted March 27, 2013 Author Share Posted March 27, 2013 (edited) Right then, hopefully (fingers crossed) problem solved Changed the coil pack clips (they literally disintegrated when I removed the old ones) I know there's only 5 there, the other one was in the house as I thought I'd show the misses why they needed doing. She likes to "show an interest" Also changed the spark plugs, first time I've done it on this one, and there was one BKR7EIX, three BCR7EIX, and two BPR5 something. Interesting mix Now all 6 are BKR7EIX NGK Iridiums. She is now idling beautifully where before it was a bit lumpy, and that clicking sound seems to be gone too. Hopefully the problem is solved, but I'll find out tomorrow when I take her out for a drive. Edited March 27, 2013 by listy (see edit history) Quote Link to comment Share on other sites More sharing options...
listy Posted March 27, 2013 Author Share Posted March 27, 2013 Oh, and cheers Ian C for the how to thread, even I could understand it Quote Link to comment Share on other sites More sharing options...
listy Posted April 8, 2013 Author Share Posted April 8, 2013 Ok, so today after a short (less than a mile) trip to work (had to take some stuff in), parked up, and two hours later, drove home and she had a misfire again Same story as before. Now dreading it may be the coil packs. Clips and plugs changed, so that's the only other thing I can think of. Going to check all the plugs some time this week, to make sure nothing untoward is going on there. Only other thing I can think of, is that on a very short journey, if excess fuel is being left in the chamber, stopping the plugs sparking properly? Is that possible? Since I changed the plugs and clips, I've only done 25+ mile journeys until today, and there hasn't been a hint of a misfire, only after today's short trip, hence thinking of a bit of over fuelling. Think I smelt petrol earlier when I got out too, which could also point that way. Any other ideas? Quote Link to comment Share on other sites More sharing options...
tomgeer Posted April 8, 2013 Share Posted April 8, 2013 Did you take the 02 sensor out and clean it up listy? If not, remove it, clean it up and stick it into a lemon over night, try it again once its been cleaned if it works temporarily then starts misfiring a day or two later my guess would be it needs replacing with a new one. Quote Link to comment Share on other sites More sharing options...
Ian C Posted April 9, 2013 Share Posted April 9, 2013 You'd smell petrol with an ignition based misfire regardless of the fuelling, as it's not burning the petrol it injects If it's just fouled plugs then it should clear up in a few minutes just at a fast idle as normal running burns up the excess. Try that before having a heart attack Quote Link to comment Share on other sites More sharing options...
listy Posted April 9, 2013 Author Share Posted April 9, 2013 Did you take the 02 sensor out and clean it up listy? If not, remove it, clean it up and stick it into a lemon over night, try it again once its been cleaned if it works temporarily then starts misfiring a day or two later my guess would be it needs replacing with a new one. I didn't no, as the clips and plugs seemed to solve it, I forgot I'll give that a try You'd smell petrol with an ignition based misfire regardless of the fuelling, as it's not burning the petrol it injects If it's just fouled plugs then it should clear up in a few minutes just at a fast idle as normal running burns up the excess. Try that before having a heart attack It idles fine to start with, but then bounces between 800 and 600 rpm, which is what it did before. Quote Link to comment Share on other sites More sharing options...
SPG Posted April 9, 2013 Share Posted April 9, 2013 check the 02 sensor, my old NA-TT used to suffer until i changed this. Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted April 9, 2013 Share Posted April 9, 2013 Any error codes? My idle is shot to hell with my TPS problem that bounces around the 400 to 1200 rpm mark on idle. Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted April 9, 2013 Share Posted April 9, 2013 Also check O2 sensor with a multimeter with the car running and warmed up. In the diagnostics port in the engine bay, Red probe to OX1, Black probe to earth or battery negative. (Learnt that from IanC ) Quote Link to comment Share on other sites More sharing options...
Noz Posted April 9, 2013 Share Posted April 9, 2013 Get an AFR gauge mate. Really helped me with my misfire. I thought I was over fueling. Turns out it's both. AFR! Quote Link to comment Share on other sites More sharing options...
The-Plethora Posted April 9, 2013 Share Posted April 9, 2013 Hope you get this sorted, if you don't have any luck with the above stuff I am fairly local to you and we could swap my coil packs (only 3 years old) into yours as a test if you want, save you spending money you may not need to spend. Did you replace all the parts of the coil pack clips? I had a really irritating stuttering problem that I was struggling to sort for ages, turned out there was a break in the coil pack pin. Bit of speaker wire packed in until I got replacement leads and never troubled me again. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.