ballsdeep Posted September 6, 2012 Share Posted September 6, 2012 (edited) Come to start it last week and instantly could hear it struggling to idle, kind of like when the ecu has been reset and runs rough for a few miles, so got on the motorway to give it a good blast but it was realy struggling to get up to speed then the cat sensor warning light came on, so I thought the 1st cat had collapsed blocking the exhaust.. So I bought a decat to replace it only to find it hasn't solved my problem just got louder!! Engine seems to be very hot but temp needle is stable? If I drive realy careful barely pressing the accelerator it doesn't sound too bad? But sounds horrible accelerating like the exhaust is blocked, after looking at my 1st cat it doesn't look blocked or collapsed?? The only thing I have tried was rest the ecu? Edited September 6, 2012 by ballsdeep (see edit history) Quote Link to comment Share on other sites More sharing options...
Noz Posted September 6, 2012 Share Posted September 6, 2012 It's difficult with problems like these, as usually double de-cat doesn't cause problems, but changing the flowof the engine may have made a small not-noticable problem become a big one. The title is slightly mis-leading, as you say your problem was there and got worst when you removed the cat. maybe best to change this title to NA running rough or something, as it doens't look to be the cats causing the problem. You have two options to look at first, the fueling or ignition. if you have a friendly mate with a garage maybe check the emissions to see if its over/under fueling. It's not a problem solver, but may help put you in the right direction. Maybe by removing the o2 sensors you have knocked something, or maybe one of these have an issue? Quote Link to comment Share on other sites More sharing options...
Nic Posted September 6, 2012 Share Posted September 6, 2012 On the in car video it sounds like it's not firing on all cylinders, check the HT leads and distributor cap are secure. If that doesn't make a difference try pulling the plugs, if it is missing on one cylinder one of the plugs will look different to the rest. Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted September 6, 2012 Author Share Posted September 6, 2012 Thanks noz just changed the title i though it was just the cat that had gone but didnt get any better after changing it, I did remove one of the o2 sensors but only to change to the decat.. Will check emissions Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted September 6, 2012 Author Share Posted September 6, 2012 Thanks nic your not the 1st to suggest it might not be firing on all cylinders.. will check dizzy cap, leads and plugs tonight! I have got a slight oil leak from the rocket covers? Maybe the plugs are soaked? Hopefully I can get this sorted? Quote Link to comment Share on other sites More sharing options...
skippyboyo1 Posted September 6, 2012 Share Posted September 6, 2012 On the in car video it sounds like it's not firing on all cylinders, check the HT leads and distributor cap are secure. If that doesn't make a difference try pulling the plugs, if it is missing on one cylinder one of the plugs will look different to the rest. Exactly what I was thinking Quote Link to comment Share on other sites More sharing options...
keron Posted September 6, 2012 Share Posted September 6, 2012 seen this many times...usually plugs will be no good or covered in water or oil so on less cylinders. the water pipe on the back of the head in the middle can split, which sends water into the 6 chambers, or loose 10mm bolts on the rocker covers causing a leak of oil into the chambers....causing a misfire etc and makes the cats glow red! try and check the plugs/leads.... Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted September 6, 2012 Author Share Posted September 6, 2012 just realy want to thank everyone that responded you guys was spot on! turns out 6, 5 , 4 cylinders were swimming in water. 4 was realy bad but i didnt have time to search for the cause of the problem, so when i come to do a service im going to need to find out whats leaking, will check the hose on the head thanks keron. also i need the torque settings for the rocker cover bolts Quote Link to comment Share on other sites More sharing options...
keron Posted September 7, 2012 Share Posted September 7, 2012 you must have a split hose mate unless you have jet washed the engine area recently? but check it out otherwise it will overheat and cause hg issues... had a couple do this recently. Quote Link to comment Share on other sites More sharing options...
Nic Posted September 7, 2012 Share Posted September 7, 2012 Notice that you have a vented bonnet fitted, that could be the reason for the water. Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted September 7, 2012 Author Share Posted September 7, 2012 Possibly but I don't think it rained last night.. After I dried it out the best I could I fired her up and everything seemed ok, but I come to drive it this morning and it ran rough again, so I inspected the chambers again and they still had water in there! Problem is the hose at the back of the head isn't easily accessible.. What's the best way to get to it Keron? Is it head off job? Quote Link to comment Share on other sites More sharing options...
Noz Posted September 7, 2012 Share Posted September 7, 2012 I filled the engine before when the TB hose came loose as the clamp had corroded. I get all sorts of those kinda problems having big vents in the bonnet, everything goes rusty. Whifbitz removed the plugs and blew air into the chambers, fixed the problem. Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted September 7, 2012 Author Share Posted September 7, 2012 Was just going to remove leads and blow the water out of the chambers at dinner, but wasn't going to remove the plugs.. Would I need to remove them too? I will put a new clamp on the tb hose to rule that out! Thanks Quote Link to comment Share on other sites More sharing options...
Noz Posted September 7, 2012 Share Posted September 7, 2012 try your way first. see how you get on. if you have shed loads of water then you may have to. the gallery should clear itself to a certain extent due to engine heat. obviouly if its over loaded it won't. Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted September 7, 2012 Author Share Posted September 7, 2012 Only get half hour for dinner but managed to blow all the water out leavin the plugs in then run out of time so test run at 3.30 fingers and toes crossed! Quote Link to comment Share on other sites More sharing options...
ballsdeep Posted September 7, 2012 Author Share Posted September 7, 2012 all is well, after a few miles the supra is healthy again! now I just need to figure out what's making this whistle noise? It's only come apparent after fitting my whifbitz 1st decat.. Maybe it's blowing abit?? Quote Link to comment Share on other sites More sharing options...
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