ellis Posted May 16, 2008 Share Posted May 16, 2008 (edited) OK, probably put this up a couple of times, but here it is once again in the hope that someone with deep technical knowledge can shed some possible light on it! Last year the engine in my car was completely rebuilt: 1. Forged pistons etc (done down at Interpro by Jason) 2. Refurbished turbos 3. Replaced stem seals 4. New water pump 5. Refurbed injectors and a host of other minor parts replaced. Car is a UK spec twin 1993, decatted (by CW). Had a boost controller fitted at Weston Performance after about 4,000 miles. Gregg said car was running lean so set it up to run slightly rich. Also said that to set up the car properly it would need a fuel controller (which it still hasn't got). Car was left. Occasionally it will boost to about 1.4bar and, if prolonged boost, the fuel cut kicks in. Car was run in gently for about 4,000 miles using mineral oil. After about 7,000 miles this little niggle has started... At standstill, if I hold the brake and slip the car into reverse (its an auto) after about 5 seconds white smoke starts coming from the exhaust - no movement of the car. Put it in neutral and blip the throttle and it clears. Occasionally (although now more frequently) this will happen whilst sat at a junction/traffic lights either with the car in neutral or in D with the foot brake on! Very slight smell of oil to begin with but this soon clears. Smoke is white and doesn't smell overly oily, more like coolant if this is possible. Radiator was replaced yesterday after old one was losing coolant. Tried to get to the bottom of the intermittent smoking but still to no avail. We've pretty much ruled out piston ring due to the fact that the engine is so new and built by Jason! Stem seals should be out as new ones were fitted and theres no smoke on startup. Possible leaking valve somewhere? Vacuum setup maybe? Anybody had a similar problem? Any thoughts, ideas etc? Mr Wilson, if you're reading this, any suggestions? Thanks in advance and sorry for the long thread but too much info is probably of more use than too little. Edited May 16, 2008 by ellis (see edit history) Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 16, 2008 Share Posted May 16, 2008 First question, how was it determined that it was running lean? have you got a wide band setup? it shouldn't happen on a std spec unless the FPR or injector or a pipe is faulty. If it was then adjusted to run rich:blink: it could only have been done by raising fuel pressure, which is again not possible on std setup, this would have also been not good for running in. As for it only smoking in reverse or junctions, I'm not sure, does it not smoke when you blip the throttle when its hot on idle, have you tried using the manual gear selection to see if you can induce it? Have you done a compression test and leak-down test? Quote Link to comment Share on other sites More sharing options...
JustGav Posted May 16, 2008 Share Posted May 16, 2008 Is the gearbox over filled? I seem to remember someone having a similar issue a while back. As for the riching it up? How is that possible on a stock ECU and stock FPR system (as mentioned above) Quote Link to comment Share on other sites More sharing options...
ellis Posted May 16, 2008 Author Share Posted May 16, 2008 The car is a double decat. Gregg was setting it all up on the rolling road at Weston and the readings he got were that the car was running lean. He tweaked with his computer and whatever else he does under the bonnet and said he'd set it to run slightly rich but would need an Apexi Neo FC to set it up properly on the rolling road. This is all I know! Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 16, 2008 Share Posted May 16, 2008 Trouble is unless you have some kind of aftermarket engine control, there is nothing for him to tweak , and the fact that he says you need an Apexi neo proves it:blink: do you know what boost pressure it was running? the trouble is if you don't have the info, none of us can do remote diagnosis. Quote Link to comment Share on other sites More sharing options...
ellis Posted May 16, 2008 Author Share Posted May 16, 2008 It was set to run at 1.2bar. Up until that point it was running at 0.8bar stock fir the running in period! Quote Link to comment Share on other sites More sharing options...
JustGav Posted May 16, 2008 Share Posted May 16, 2008 If you are using the stock system and going BPU (ie above 0.8 bar), the system does run rich as it goes beyond ECU control this is a known fact. Quote Link to comment Share on other sites More sharing options...
ellis Posted May 16, 2008 Author Share Posted May 16, 2008 Apparently it was running lean! It was BPU before the rebuild and was rebuilt still as BPU. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 16, 2008 Share Posted May 16, 2008 If you are using the stock system and going BPU (ie above 0.8 bar), the system does run rich as it goes beyond ECU control this is a known fact. It can't go beyond ECU control, but its said that once the last ref point on the map is reached ie beyond 1.1 bar the injectors are set for max DC ie 100% however this has not been proved, but the fact that ellis was told it was running weak is the worrying part as like you say once decated the whole map is on the rich side, this is very curious apart from the smoke. Quote Link to comment Share on other sites More sharing options...
JustGav Posted May 16, 2008 Share Posted May 16, 2008 It can't go beyond ECU control, but its said that once the last ref point on the map is reached ie beyond 1.1 bar the injectors are set for max DC ie 100% however this has not been proved, but the fact that ellis was told it was running weak is the worrying part as like you say once decated the whole map is on the rich side, this is very curious apart from the smoke. Yup, that is it, I was keeping it simple for now. (I know we are in technical, but I'm not sure how much ellis knew ) By beyond ECU control I meant that it opens the injectors up and just pours it in.... I have seen this on my old emanage logs actually where the injectors went to 100%. Quote Link to comment Share on other sites More sharing options...
ellis Posted May 16, 2008 Author Share Posted May 16, 2008 What about fuelling though? Stock pump has been replaced with Walboro one Quote Link to comment Share on other sites More sharing options...
bluecoup Posted May 16, 2008 Share Posted May 16, 2008 id say smoke is oil any little coolant would most likely completly disapear before it got to the exhaust exit, any chance of a video ? Quote Link to comment Share on other sites More sharing options...
JustGav Posted May 16, 2008 Share Posted May 16, 2008 Parking the fuelling issue for a bit... Re-read the original post, you mention coolant lose.... Did you have a hole in your rad that meant you replaced it, or was it a case of changing the rad because you suspected a hole. Is it all possible that the coolant is getting into the engine perhaps? (esp. white smoke bit) Quote Link to comment Share on other sites More sharing options...
ellis Posted May 16, 2008 Author Share Posted May 16, 2008 The rad was leaking quite nicely - had been for a while. That was the only reason for replacement. Quote Link to comment Share on other sites More sharing options...
ellis Posted May 16, 2008 Author Share Posted May 16, 2008 id say smoke is oil any little coolant would most likely completly disapear before it got to the exhaust exit, any chance of a video ? Will do one on the phone later. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 16, 2008 Share Posted May 16, 2008 Yup, that is it, I was keeping it simple for now. (I know we are in technical, but I'm not sure how much ellis knew ) By beyond ECU control I meant that it opens the injectors up and just pours it in.... I have seen this on my old emanage logs actually where the injectors went to 100%. Thats interesting, never managed to get mine to go 100%. As said ellis, a BPU UK TT should not be weak, as the ECU map is a lot on the rich side anyway, the only thing that would make it weak is a fault. Quote Link to comment Share on other sites More sharing options...
JustGav Posted May 16, 2008 Share Posted May 16, 2008 As said ellis, a BPU UK TT should not be weak, as the ECU map is a lot on the rich side anyway, the only thing that would make it weak is a fault. 100% agree, something isn't right somewhere... I see this as two seperate issues (perhaps with a common element)... 1. Fuelling issue (Still confused on this one ) 2. Smoke issue (being white indicates coolant possibly) Quote Link to comment Share on other sites More sharing options...
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