Odin Posted September 18, 2011 Share Posted September 18, 2011 (edited) As some of you may know i have been doing an n/a-tt transplant for the last 3-4 weeks and have been experiencing some difficulties,to cut a long story short i rewired the lambda sensor today and swapped over the 2 identical black wires(this was on the exhaust part where there are 2xblack/1xwhite/1xblue) and connected them properly to the mating half of the stock lambda sensor (the part which runs into the loom) and hey presto it worked!!i reset the ecu and checked for diagnostic codes and there werent any - Winner!... Obviously i decided to take it for a nice drive to make sure everything was ok,i started on country lanes and progressed onto the M6 and everything seemed great she was running really well the turbo's were boosting perfectly - if anything the 2nd turbo was kicking in a little late at 4500revs but all in all a very impressive drive,its set to 1 bar and didnt exceed that and the oil temp never went above 100 degrees,.... However after about an hour or so there was a kind of missfire - almost like a fuel cut or something to that effect,at first it was happening when the 2nd turbo should be kicking in but now its happening just driving it normally even down my road at a slow speed. - The main symptom is all of a sudden i will lose power on the throttle pedal for 1 approx 1 second and then it will quickly kick back in as if it had never lost power which means a massive jerk/surge in acceleration, so once again im having what i hope will be my final teething problem with this project for a while and was wondering if anyone had experienced anything similar? ps i checked all the turbo pipes and they are all still on and there are still no diagnostic codes showing Many thanks as Always James (just to give a special thanks to all that have helped me this far including RyanG,Chris Wilson,KenBlockSeal and many others - Thanks a lot guys much appreciated) Edited September 18, 2011 by Odin (see edit history) Quote Link to comment Share on other sites More sharing options...
Odin Posted September 19, 2011 Author Share Posted September 19, 2011 Should I think about getting a new fcd or do you think it could be something else? Quote Link to comment Share on other sites More sharing options...
Geo Posted September 19, 2011 Share Posted September 19, 2011 coil packs? maybe? Quote Link to comment Share on other sites More sharing options...
Odin Posted September 19, 2011 Author Share Posted September 19, 2011 Good call I'll check when I get home,the engine did get really hot maybe I fried an electrical circuit? Quote Link to comment Share on other sites More sharing options...
Odin Posted September 19, 2011 Author Share Posted September 19, 2011 Grrr in addition to this i got home today and tried to take a reading from the diagnostics and now for some reason i cannot get one also i checked the wires to see if any had been incinerated but there is no evidence of this the coilpacks all seem fine,I started it up after all these checks and it idled for about 30 secs before it just cut out,now it wont start-it ignites but cuts out instantly,this made me question the fuel level as i had an auto tt rev cluster fitted to an n/a so i thought perhaps the fuel gauge was incorrect (if thats possible) i dropped a nut on some string into the tank and there was some fuel in it (the fuel went to 1.5" above the nut) So now i have it a brick wall ive gone from a great runner to a non runner in about 2hours worth of driving .. Any ideas? Many thanks James Quote Link to comment Share on other sites More sharing options...
Scott Posted September 19, 2011 Share Posted September 19, 2011 Coolant temp sensor. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 20, 2011 Share Posted September 20, 2011 Did you check the ecu grounds? Brown cables. They terminate under the intake manifold at two eyelet tags. If one or both are off or insecure it will give all sorts of odd issues, including a check engine light that glows very dimly all the time or doesn't work at all. Quote Link to comment Share on other sites More sharing options...
Odin Posted September 20, 2011 Author Share Posted September 20, 2011 Thanks guys been working late today so I'll try that tomorrow when I finish,hopefully this is going to be something as simple as an earth or faulty connection Quote Link to comment Share on other sites More sharing options...
Odin Posted September 21, 2011 Author Share Posted September 21, 2011 I have been unable to locate these earth wires under the intake manifold is there a reference near to where they bolt on Chris? Trying to find it on my driveway is proving more difficult than anticipated i should have left it at the garage. It is strange though on sunday it started every time and now i cannot get any diagnostic codes for it and it wont start it all now - as soon as it ignites it cuts out Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 21, 2011 Share Posted September 21, 2011 Two eyelet tags to indicated thread in casting. Quote Link to comment Share on other sites More sharing options...
Odin Posted September 22, 2011 Author Share Posted September 22, 2011 They look fine to me Chris I'll double check after work as it was raining but I don't think that's going to be the problem-shame I can't just drive it to shropshire,back to the drawing board Quote Link to comment Share on other sites More sharing options...
Konrad Posted September 22, 2011 Share Posted September 22, 2011 Fuel filter needs changing? Quote Link to comment Share on other sites More sharing options...
Odin Posted September 22, 2011 Author Share Posted September 22, 2011 It seems like either a fuel or ignition problem but it's probably something as simple as a faulty/loose connection next time I think of doing something like this I think I'll leave it to the experts just wondering if there was anyone in the cheshire area who may be able to look it over for me? Quote Link to comment Share on other sites More sharing options...
Konrad Posted September 22, 2011 Share Posted September 22, 2011 I still insist on fuel filter check Quote Link to comment Share on other sites More sharing options...
Odin Posted September 22, 2011 Author Share Posted September 22, 2011 How do I go about checking the fuel filter is operating properly ? Quote Link to comment Share on other sites More sharing options...
Konrad Posted September 22, 2011 Share Posted September 22, 2011 It's cheap enough to change it if you never done this job before. I change it during engine conversion anyway as there is a chance that there will be some particles around. Had same thing happening to my gf car and it was quite sudden. Quote Link to comment Share on other sites More sharing options...
Odin Posted September 22, 2011 Author Share Posted September 22, 2011 Ok Chris after further inspection and removing 2hoses temporarily I can see that there are no earths on that housing under the intake manifold (providing I'm looking in the correct place?approx 3" below and 2" to the right of diagnostics port) which leaves me a problem,where have these earths gone and where else are they supposed to attach? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 22, 2011 Share Posted September 22, 2011 Why not just get it trailered over here and I can sort it for you ? Quote Link to comment Share on other sites More sharing options...
Odin Posted September 22, 2011 Author Share Posted September 22, 2011 (edited) The thought is getting very tempting i possibly have access to a trailer and winch i would have to see how much it would cost me and save a bit though, - On the plus side i did just manage to get a diagnostic code which is showing as 78 - apparently some sort of problem with either the fuel pump (which is a stock n/a incidentally) or the fuel pump circuit, - Apart from the obvious - buy tt a fuel pump,is there anything else that may be causing this. Im wondering whether in my excitement to get the car out i have managed to fry a fuel connection wire around the gearbox as it did get rather hot down there and i didnt put the wiring in silicone hoses, I also dont think that there is any power to the pump as i cant hear the humming noise of it priming even when i bridge +B and FP in the diagnostic port which makes me think its more a connection than the pump itself. Has anyone ever encountered error code 78? if so what did they try? I have ran a search and looked through the 14pages but couldnt see anyone having had this problem Many thanks guys Edited September 22, 2011 by Odin (see edit history) Quote Link to comment Share on other sites More sharing options...
Konrad Posted September 23, 2011 Share Posted September 23, 2011 DTC 78 - FUEL PUMP CONTROL CIRCUIT CAUTION: If ECM replacement is instructed in following testing, always ensure ECM connectors and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. Circuit Description The 2-speed fuel pump is operated by the fuel pump ECU which receives a signal from ECM to compensate fuel pressure for start, light engine load or high engine load. DTC is set during the following 3 conditions: 1) Open or short in fuel pump circut is detected for 1 second or more with engine speed of 1000 RPM or less. 2) Open in input circuit of fuel pump ECU with engine speed of 1000 RPM or less. 3) Open or short in fuel pump ECU diagnostic signal line with engine speed of 1000 RPM or less. Possible causes for all conditions are: * Fuel pump ECU open or short circuit. * Fuel pump ECU. * ECM power supply circuit. * Fuel pump. * ECM. Diagnosis & Repair 1) Turn ignition on. Using jumper wire, connect DLC1 terminals +B and FP. See Fig. 11. Check if fuel pressure can be felt in hose to fuel filter. If pressure is felt, go to next step. If pressure cannot be felt, go to step 3). 2) Check for open or short in +B and FP circuits between DLC1 and fuel pump ECU. Fuel pump ECU is located back of left rear wheelwell, behind trim panel. See appropriate wiring diagram in L - WIRING DIAGRAMS article. Repaire as necessary. If circuits are okay, go to step 5). 3) Ensure ignition is on. Using DVOM, measure voltage between ground and DLC1 terminal +B. If voltage is 9-14 volts, go to next step. If voltage is not 9-14 volts, inspect ECM power supply circuit and +B circuit between DLC1 connector and main relay. See appropriate wiring diagram in L - WIRING DIAGRAMS article. Repair as necessary. 4) Inspect FP circuit for open or short between DLC1 connector, fuel pump and ground. Repair as necessary. If circuit is okay, replace fuel pump. 5) Access fuel pump ECU. Fuel pump ECU is located back of left rear wheelwell, behind trim panel. Disconnect fuel pump ECU connector. Check voltage between terminals "E" and FPC at ECU wiring harness connector. See Fig. 18. Turn ignition switch to START position. If voltage is 4.5-5.5 volts, replace fuel pump ECU. If voltage is not 4.5-5.5 volts, go to next step. 6) Inspect FPC circuit between ECM and fuel pump ECU for open. See appropriate wiring diagram in L - WIRING DIAGRAMS article. Repair as necessary. If circuit is okay, inspect "E" circuit between fuel pump ECU and ground. Repair as necessary. If both circuits are okay, go to next step. 7) Inspect DI circuit between ECM and fuel pump ECU for open or short. See appropriate wiring diagram in L - WIRING DIAGRAMS article. Repair as necessary. If circuit is okay, replace ECM and retest Quote Link to comment Share on other sites More sharing options...
Konrad Posted September 23, 2011 Share Posted September 23, 2011 (edited) Oh and just to add, AFAIK NA and TT Jspec fuel pump is the same thing. When you open pdf file go to EG-277 and there is exact location of ground cable.SFI System - 2JZ-GTE.pdf Edited September 23, 2011 by Konrad (see edit history) Quote Link to comment Share on other sites More sharing options...
Odin Posted September 28, 2011 Author Share Posted September 28, 2011 Thanks for all your help Konrad and everyone else who also helped along the way. It's officially alive and running well happy days Quote Link to comment Share on other sites More sharing options...
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