bignum Posted November 7, 2005 Share Posted November 7, 2005 hi guys,had this hesitation for a while now,mostly when the weather is cold.Its more noticable when going uphill in 4th or 5th under part throttle or wot and only 1.5k to 4k rpm ie when the second turbo comes on acceleration is smooth upto redline.the problem wasent really there over the summer months but ive recently replaced my old intercooler with a cw/smic and both decats so im just under 1 bar.also changed plugs yesterday to ngk bkr7e and gapped to 0.9mm thinking this would cure my problem but still there.On the boost gauge im getting 0.8 bar then it drops to about 0.5 just before transition then upto just below 1 bar at 4k.tried 3 different types of petrol aswell ,still the same ,so im running out of ideas now any opinions would be very helpfull,oh and its a uk car, cheers in advance si Link to comment Share on other sites More sharing options...
tbourner Posted November 7, 2005 Share Posted November 7, 2005 Do your revs drop to low level at all? Link to comment Share on other sites More sharing options...
bignum Posted November 7, 2005 Author Share Posted November 7, 2005 Do your revs drop to low level at all? not really ,the revs seem to climb steadily as normal.or do you mean if the car is reved while not moving. Link to comment Share on other sites More sharing options...
tbourner Posted November 7, 2005 Share Posted November 7, 2005 No, I mean after this hesitation; if you stop and put the clutch down are the idle revs lower than normal? Link to comment Share on other sites More sharing options...
bignum Posted November 8, 2005 Author Share Posted November 8, 2005 No, I mean after this hesitation; if you stop and put the clutch down are the idle revs lower than normal? sorry,no it idles fine. Link to comment Share on other sites More sharing options...
tbourner Posted November 8, 2005 Share Posted November 8, 2005 Sounds like a plug issue to me, BKR7Es should be fine - but shouldn't your gap be smaller than that? Link to comment Share on other sites More sharing options...
tbourner Posted November 8, 2005 Share Posted November 8, 2005 Look at point 2b here: http://www.mkivsupra.net/vbb/showthread.php?t=41908 And check the bit about Q. Why do you need to GAP a plug? here: http://www.mkivsupra.net/vbb/showthread.php?t=41927 Link to comment Share on other sites More sharing options...
Marco Posted November 8, 2005 Share Posted November 8, 2005 I've got exactly the same problem... Link to comment Share on other sites More sharing options...
tbourner Posted November 8, 2005 Share Posted November 8, 2005 Mine spluttered a while ago, but the idle revs were very low as well, it's only done it once so far so not sure what caused it. Constant misfire under load has to be plugs doesn't it? Link to comment Share on other sites More sharing options...
bignum Posted November 8, 2005 Author Share Posted November 8, 2005 i dont think its plugsas ive replaced them and gapped as recomended,also it dosent feel or sound like a missfire[the engine note doesent change during hesitation] but the symptems are like the overfueling as described in ianc,s thread link,so i will look into that,cheers tbourne. Link to comment Share on other sites More sharing options...
bignum Posted November 8, 2005 Author Share Posted November 8, 2005 surely some other people have had problems like or know what it is,come on guys, mfs has the problem so im not imagining it,am i? Link to comment Share on other sites More sharing options...
Ian C Posted November 8, 2005 Share Posted November 8, 2005 Video it -Ian Link to comment Share on other sites More sharing options...
Marco Posted November 8, 2005 Share Posted November 8, 2005 I've had this problem for quite a long time now. Sometimes I dont notice it at all, sometimes its pretty bad! It started after I went BPU -> upgraded fuelpump, decat, hybrids... I'm still running 440cc injectors. I was planning to go to Thor this weekend to have the fuelling sorted out properly with my s-afc2, but I had to cancel that because the car is in the garage now for repairs Link to comment Share on other sites More sharing options...
bignum Posted November 9, 2005 Author Share Posted November 9, 2005 I've had this problem for quite a long time now. Sometimes I dont notice it at all, sometimes its pretty bad! It started after I went BPU -> upgraded fuelpump, decat, hybrids... I'm still running 440cc injectors. I was planning to go to Thor this weekend to have the fuelling sorted out properly with my s-afc2, but I had to cancel that because the car is in the garage now for repairs oh,ok nothing serious i hope! Link to comment Share on other sites More sharing options...
Marco Posted November 9, 2005 Share Posted November 9, 2005 oh,ok nothing serious i hope! It is pretty bad -> http://www.mkivsupra.net/vbb/showthread.php?t=51006 Link to comment Share on other sites More sharing options...
bignum Posted November 9, 2005 Author Share Posted November 9, 2005 sounds pretty bad then,little fckers,i hate parking my car anywhere because of jealous bastards like these,let me know how you get on with that heitation thing tho,prob not your top prioity at the moment i think. Link to comment Share on other sites More sharing options...
Marco Posted November 9, 2005 Share Posted November 9, 2005 Indeed... As soon as I had it on the dyno I'll let you know Link to comment Share on other sites More sharing options...
TLicense Posted November 9, 2005 Share Posted November 9, 2005 Coil packs maybe? You can test them by checking the resistance across the two pins should be 0.54-0.84 ohms cold and 0.68-0.98ohms hot (IIRC 50degs c is what's regarded as hot) Link to comment Share on other sites More sharing options...
Marco Posted November 9, 2005 Share Posted November 9, 2005 Coil packs maybe? You can test them by checking the resistance across the two pins should be 0.54-0.84 ohms cold and 0.68-0.98ohms hot (IIRC 50degs c is what's regarded as hot) I have no idea how to do that Tony! Link to comment Share on other sites More sharing options...
TLicense Posted November 10, 2005 Share Posted November 10, 2005 Hehe, no worries Marco, Errmm well remember we took the spark plug cover off when we did your rocker cover gaskets? Well you need to take that off. You'll then find some of these which are the coil packs:- Which have a plug that looks like this (We replaced all these last time as they go brittle):- Anyway what you want to do is rob a multimeter off of someone (they're not much to buy to be honest) and measure the resistance between the two metal contacts of the coil pack. You can take the coil packs out if it makes getting the multimeter probes in (You'll need a 10mm socket to undo them) It probably sounds more difficult than it is. You could do it in half an hour easy. Did you get around to replacing that rubber hose that had split? I'm going to be placing an order for some odds and sods for Hannah's brother (He's just seen the Supra light and bought a JDM TT6 - Good lad!) so I could order that up for you at the same time. Should only be a fiver or so. Let me know. Cheers, Tony Link to comment Share on other sites More sharing options...
TLicense Posted November 10, 2005 Share Posted November 10, 2005 Just thought, I'm not saying it is them, just one thing to check and maybe tick off the list Link to comment Share on other sites More sharing options...
Marco Posted November 10, 2005 Share Posted November 10, 2005 No i didn't order that hose, if you could get it for me that would be great! Thanks I'll check the coil packs when I get the car back Link to comment Share on other sites More sharing options...
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