TimH Posted February 4, 2006 Share Posted February 4, 2006 Following on from my other thread (http://www.mkivsupra.net/vbb/showthread.php?t=58060), we had concluded that I may have a split pipe or a pipe that had come loose. I was trying to get the car to Whifbitz but couldn't risk it (thanks to Paul if he reads this, who offered to help ) Finally found the problem: http://www.compass-systems.co.uk/celica/closeupvalve.JPG It is a three way connector that only had two pipes attached, as soon as I put my finger over the open end the revs stabilised, so I have capped it off for now. My Question is, surely there wouldn't be a three way pipe without a third pipe, I've looked everywhere for a hanging down pipe but to no avail, as far as I can see one pipe goes to my boost controller the other to the throttle body - what else would be plugged into it? Some more pics: http://www.compass-systems.co.uk/celica/valve2.JPG http://www.compass-systems.co.uk/celica/valveinside.JPG http://www.compass-systems.co.uk/celica/rightvalve.JPG Hope someone can shed some light on this Quote Link to comment Share on other sites More sharing options...
JohnA Posted February 4, 2006 Share Posted February 4, 2006 That's the FPR boost/vacuum signal isn't it? Maybe someone in the past had a dump valve connected to that "Y" connector. Dodgy things, if you get a leak there you risk doing a 'Jake' under boost (i.e. running lean and melting pistons'n'stuff) I would much rather use the adjacent pipe and leave the FPR well alone! Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted February 4, 2006 Share Posted February 4, 2006 Yea John you're right (although I'm sure you already know this ) Tim, this wasnt going to your boost guage was it? (as this would be the reason it was reading as if the engine was off!!) I'd get it swapped over if I were you. Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 That's the FPR boost/vacuum signal isn't it? Maybe someone in the past had a dump valve connected to that "Y" connector. Dodgy things, if you get a leak there you risk doing a 'Jake' under boost (i.e. running lean and melting pistons'n'stuff) I would much rather use the adjacent pipe and leave the FPR well alone! Hmmm not quite sure what your saying John, but it has been leaking and now I'm getting black smoke when the tubbies kick in (overfueling?) - I've stopped driving it for the moment, she runs fine now but is just blocking it off ok? I do have an SSQV dump valve but believe it doesn't go to that pipe, I don't think any pistons are melted (I hope) and it seems to be overfueling (or was before I blocked off the pipe as it stunk of petrol) Bear in mind I'm no great mechanic so maybe putting any comments in laymans terms would help Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 Just been thinking about it (duh) what you mean (using john's picture) that take the three way out and plug it straight into where indicated in the picture? What about the black smoke I'm getting when the turbo's spool up? I'm worried now Quote Link to comment Share on other sites More sharing options...
Jake Posted February 4, 2006 Share Posted February 4, 2006 As John says, having an unsealed pipe to the Fuel Pressure Regulator is a bad idea. As I found out : http://img324.imageshack.us/img324/5690/meltedpiston013wb.th.jpg Where is your boost gauge plumbed into? Seems a likely candidate for that postion. Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted February 4, 2006 Share Posted February 4, 2006 is the boost guage working when you block the pipe off? Edit: kinda beaten to it! Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 The boost guage is plumbed straight into the circled 3 way valve in the below picture and then going to what I presume is where it should be plumbed in in the first place (re Johns picture): http://www.compass-systems.co.uk/celica/valve2.JPG Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 is the boost guage working when you block the pipe off? Edit: kinda beaten to it! Yes it is - working like before Quote Link to comment Share on other sites More sharing options...
JohnA Posted February 4, 2006 Share Posted February 4, 2006 ...as soon as I put my finger over the open end the revs stabilised, so I have capped it off for now.... this indicates that you had a leak from that T-piece, right? That would make your idle dodgy, and the boost gauge would show funny things too (not going to the full vacuum on idle for one) Even worse, the fuel pressure regulator would not see the proper boost signal under boost so the fuelling would be leaner than it should. It all depends on how big the leak was. If that T-piece was totally uncapped then I doubt that the FPR would see *any* boost and that could be dangerous, especially if you run a lot of boost (is yours BPU? I hope not) How long has that leak been there anyway? Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 this indicates that you had a leak from that T-piece, right? That would make your idle dodgy, and the boost gauge would show funny things too (not going to the full vacuum on idle for one) Even worse, the fuel pressue regulator would not see the proper boost signal under boost so the fuelling would be leaner than it should. How big was the leak, if that T-piece was totally uncapped then I doubt that the FPR would see *any* boost and that could be dangerous, especially if you run a lot of boost (is yours BPU? I hope not) How long has that leak been there anyway? I am BPU and the leak only happened on M25 last night and I drove like a nun after it happened and haven't driven it since except to test capping off fix It's now fine but I'm getting black smoke when the turbo's kick in Quote Link to comment Share on other sites More sharing options...
JohnA Posted February 4, 2006 Share Posted February 4, 2006 Have someone do a compression test, it's not that complicated. If everything looks OK then you probably got away with it -- if you were driving like a nun then you were off-boost and couldn't hurt much. Were you full-throttle when it popped? Maybe the black smoke is unrelated (I hope) Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted February 4, 2006 Share Posted February 4, 2006 John, what is that fpr doing when the engine is making neither vacuum or positive boost? presumably nothing? Quote Link to comment Share on other sites More sharing options...
Jake Posted February 4, 2006 Share Posted February 4, 2006 Don't panic Tim. It may just need an ECU reset if it's been trying to cope with that air leak. Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 Have someone do a compression test, it's not that complicated. If everything looks OK then you probably got away with it -- if you were driving like a nun then you were off-boost and couldn't hurt much. Were you full-throttle when it popped? Maybe the black smoke is unrelated (I hope) I think I had just put my foot down to overtake and then realised the car wasn't accelerating and started to get worried. Hmmm problem is I need to get the car back to Ipswich and I'm in london, I guess driving it is a seriously bad idea??? Bugger - double bugger Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 Don't panic Tim. It may just need an ECU reset if it's been trying to cope with that air leak. That's the odd thing, it's accelerating fine - boost guage back to normal, just worried about this black smoke, I've always prided my car on the fact it produced very little smoke. Quote Link to comment Share on other sites More sharing options...
JohnA Posted February 4, 2006 Share Posted February 4, 2006 John, what is that fpr doing when the engine is making neither vacuum or positive boost? presumably nothing? It's always compensating. Under vacuum the fuel pressure is LESS than the 'nominal' 3 bar, under boost it is MORE. If you're doing 1bar boost for example, the FPR makes sure that the fuel pressure is 3bar + 1bar = 4 bar. This way the tip of the injectors still have 3bar difference from their ambient air (which is now pressurised:) ) If you're doing over 1bar boost with that hose popped, then you seriously risk melting bits (AFRs go leaner than 15:1, I've checked it by accident lol....) Yours is a JSpec so it could be even worse. But don't panic, as Jake said first reset the ECU, go for a drive and see how it goes. Then do a compression test to be sure. Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 Ok off to reset and drive (need some more ciggies after all this scarey talk of melting pistons) - Can I do a compression test myself, I know what they are but have clue how to do them myself ... Thanks for all the helpful suggestions so far, you have all been great Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 OK!!!!! Well the reset has definately cleared the black smoke issue - I drove like a nun (again) for ten minutes to let her warm up and then slowly bit by bit built up boost, no smoke, no hesitation - infact the tickover is smoother than it was before I had this issue I'm hoping I got away with this little episode, anything else I should check when I get her back to my mechanic?? The only thing I would say is that it smells like it's running a little rich, but I guess that's just the ECU finding it feet after a reset. Thankyou evryone who commented - it's been a very up and down 24hrs, I love my supra and this is the first problem I have had. Great show guys and I owe some beer tokens :respekt: Quote Link to comment Share on other sites More sharing options...
Jake Posted February 4, 2006 Share Posted February 4, 2006 YAY! Looks like you got away with it this time. Have another look at the picture of my piston and consider yourself lucky! Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted February 4, 2006 Share Posted February 4, 2006 glad its sorted. Still a mystery where that pipe went tho. Do you think it was simply blocked off before too? Any chance you could ask the previous owner? Quote Link to comment Share on other sites More sharing options...
TimH Posted February 4, 2006 Author Share Posted February 4, 2006 glad its sorted. Still a mystery where that pipe went tho. Do you think it was simply blocked off before too? Any chance you could ask the previous owner? I have some high res pictures of the engine bay at work so I will do some zooming in and see I can see if anything was attached in the first place next week. Jake - the melted piston is now by PDA screensaver, just to remind me of what can happen when you mess with the supe Happy chappy for the moment 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.