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t4 problems over fueling to the max.??

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  • #16
    well i have already earthed the bolt that the ecu earth is connected to , so the ecu earth runs to the body above the ecu and i ran a direct earth from the battery to that point so the 2 are touching and also earthed to the body.
    the wiring isnt that ratty it has had some body silicon the backs of all the plugs to stop the dirt and water getting in them.
    today at 3 i went out and thought i would just give it a try with out changing anything. and sure enuf the bloody thing started. not running cleanly tho. turned it off then started again. then i let it cool down abit and changed the sensor back for the ones i got of matt. which are the not the ones i had in the car when this all started. i then tried to start it and it started and seemed to run on 3cly, i pulled leads while running to see which one wasnt firing and they all affect the idle. i let it idle for a bit more, walked about 5ms away and it died , and wont start again . so it started after it wouldnt yesterday with out changing anything.
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    • #17
      What Jimmy is saying is open up the loom at the ECU and hook another earth wire to it. Strip the wire and solder a length to it and earth that, back to the battery is best.

      Could be the wire is high resistance through the crimp at the earth point which is affecting the voltage the ECU sees. Low voltage at the ECU causes it to richen the mixture.

      On G60s it is a particular problem because of the forced induction, they billow black smoke.



      Gavin
      optimumcode@gmail.com | https://www.vwwatercooled.com.au/for...i-;-79012.html | https://www.facebook.com/TTY-Euro-107982291992533

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      • #18
        so the connector to the ecu, find the earth in the connector link it straight to the neg terminal, thats what you guys mean . i might find the pin and check the resistance of the circut before i cut it all up. if i get a chance 2morro ill have a go at it. trying to get the damn thing ready so i can take it down to summernats lol. tic tok
        cheers brenton
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        • #19
          also once the ecu has been fried will the car run at all ? the injector driver screwed up etc ?
          cheers brenton
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          • #20
            Yeah just to clarify find the earth wire at the ecu plug, instead of splicing into it cut the thing all together and join it to a new wire and run it directly to earth. So you should have the ecu mutli plug with all the wiring as normal apart from the earth, this will be seperate. Open the loom up its the thick brown wire and cut it. I know im repeating but i might not have been clear. Now that the wire is cut. Connect a new wire to the ecu side of the cut and run it to earth. Fried ecus can be weird just depends on the way that its been fried. They can run but most often they run awful and fill the cylinders .
            Hope thats a bit clearer ( i do waffle a little bit) And just to add to H100W comment he is spot on this fault used to happen to the Corrado G60 and was a VW technical Bulletin and referred to re routing the earth and cutting the crimp off.
            Cheers
            Alba European
            Service, Diagnostics and repairs. Mobile Diag available on request
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            • #21
              once again guys thanks for replying to these posts, i will cut the new earth into the ecu plug 2morro if i get the chance and see how that goes.
              i suppose the bad earth (where ever it is) could be heating up with the current flow through it, increasing the resistance the longer the motor is running. The resistance would become greater as it heats up and then becomes too much for ecu to function.
              it would make sense to me that it is a bad contact somewhere as it all happened after a few days of rain. which could have gotten into the wiring somewhere. also this van isnt a baby by anymeans, its got 370,000kms on its wiring lol.

              cheers brenton
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              • #22
                hey guys i checked the resistance on the major earth on the ecu plug, my mulit meter was showing less than 0 ohms, so it seems to be well earthed. there was a smaller about 1mm brown and yellow i think wire that i assume is another earth wire and it showed .3 ohms on the 10x setting so around 3 ohms i think.
                i pulled out the o2 sensor but i have no other like it, so i couldnt swap it to try. i cleaned off the blackness lol and put it back in. i tryed to start with it unplugged and plugged in no difference.
                how or where can i get this damn thing fixed
                cheers brenton
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                • #23
                  hey guys another update , i fooled around again did so stuff cant really remeber now lol my brain is sore from staring at the motor. but i ended up splicing in a new 2nd hand o2 sensor from a 2.5l van and checked the sensor etc to make sure they where changing resistance for temp increase. got the van running and i ran for prob 30mins still seems abit rich , stumble from coasting to accel. but it didnt stall like it was before. ill have to wait untill the morning to see if it will start cold. here's hoping

                  will the ecu relearn new values and settle down abit ?

                  cheers brenton
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                  • #24
                    o2 sensors can cause big enrichening problems for sure, only thing is on cold start the system is in open loop till warm then closed loop, thats when the sensors are important. Just refresh me again mate , does it happen warm or cold???? im like you my brain is hurting large day mate
                    Cheers
                    Alba European
                    Service, Diagnostics and repairs. Mobile Diag available on request
                    Audi/VW/Porsche Factory trained tech 25+ yrs exp
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                    • #25
                      Jimmy, did you evre work on any G60s. When they started over fuelling, you could tape the wide open throttle switch in so the ECU ignored the lambda probe and ran off stored maps. Basically putting it into open loop.

                      Just wondering if it would be possible to do the same with this van.

                      Brenton can you see the output of the probe using VAG-COM? Or stick your multimeter across the probe on volts. From cold the voltage will increase from 0 up towards a volt, once warmed up the voltage will hunt about a bit due to the slow sampling rate of the meter, but it will be indicating somewhere around 0.8 volts on average, showing that it is cycling up and down.

                      Revving the engine will make the voltage go high and stick there briefly, a rich mixture to make the motor accelerate. When you come off the throttle, the output will drop to 0, over run cutoff, until the revs drop to 1500 or so then, the hunting up and down will start again.

                      If you don't see what I have described above, you need to work out why.

                      You could also check the throttle pot and switches with VAG-COM and make sure they are behaving properly, you can also see the water temp output too.

                      Gavin
                      optimumcode@gmail.com | https://www.vwwatercooled.com.au/for...i-;-79012.html | https://www.facebook.com/TTY-Euro-107982291992533

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                      • #26
                        ill have a look at the readouts via multimeter 2moro gavin, the motor was warm when i changed the o2 sensor. and it seems to have leaned the fueling out a fair bit. ill have to see if i can start the van cold to see if the orginal problem is gone. i think the upgraded earths that i have placed around the engine has helped fix some of the problems.
                        also which sensor tells the motor when to change to closed loop ?
                        cheers brenton
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                        • #27
                          hey guys it looks like i have fixed the van, lets hope it works cause im taking it down to canberra at 6 lol. so i reearthed the ecu, changed the 02sensor, changed the 2 and 4 pin sensors, cleaned air temp sensor, cleaned isv,
                          if i break down ill just put a for sale sign on the van and walk home hahah
                          thanks again guys for all the help ( gavin and jimmy ) lets hope this thread can help someone else in the future aswell. lots of good info one of the more indepth threads on the forum i think.
                          have a good weekend guys
                          cheers brenton
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                          • #28
                            Gavin , yes i did heaps on the G60 mate right in ma prime then buddy!!!!! hehehe yeah Golf with the digifant did this too - you are right if the computer read wide open throttle then you go into open loop like you say as i has no need to be regulating at wide open. Yeah very good point mate. Only one other thing apart from the stuff we discussed is a blocked return line???? this will also make a system rich. But me thinks the earths and then a proper reset of the ecu would make 100% difference to the Van.
                            CHeers mate
                            Jimmymac
                            Last edited by Jmac; 04-01-2008, 08:43 PM. Reason: Friday night had a gutfull and tired so spelling no good
                            Alba European
                            Service, Diagnostics and repairs. Mobile Diag available on request
                            Audi/VW/Porsche Factory trained tech 25+ yrs exp
                            For people who value experience call 0423965341

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                            • #29
                              hey guys i made it down to summernats pulled into the parking lot and stalled lol rolled into a spot then, stayed there till this sarvo. drained the oil and changed the plugs, pull started it and drove home with out stopping lol. so i have some more things to look for hey. blocked return line, ill check 2morro. with the ecu being reset , you do that with a 1551 ? i have used matts but he's not really sure on how to do all the things. i did see a menu that said some thing like reutrn to basic settings. is this what your talking about jimmy ? and can i just choose that menu and it will reset them for me ?
                              cheers brenton
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                              • #30
                                Yeah you can with 1551 mate no worries, use address word 01 for engine , then there is some bits and bobs you have to do before initiating the basic settings as follows -

                                ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit with the "Address word" 01. When doing this the engine must be running at idling speed.
                                (Connecting fault reader and selecting engine electronics control unit => Page 01-2.)
                                ‒ → Pull crankcase breather hose off pressure regulating valve ( the pipe that fits onto the breather on the rocker cover and route so that only fresh air can be drawn in.
                                ‒ Operate fault reader taking into account the information on the display:
                                ‒ Input 04 for "Initiate basic setting" and confirm with Q.
                                Note:

                                If the engine stalls, after restarting it can take for up to 4 minutes at an increased idling speed. In this case do not continue, until the idling speed has decreased.


                                → Indicated on display: Basic setting HELP
                                Input display group number XXX

                                ‒ Press keys 0, 0 and 1 for "Display group number 1" and confirm entry with Q key.


                                → Indicated on display:
                                (1...4 = Display zones) System in basic setting 1 ⇒
                                1 2 3 4

                                ‒ Terminate engine basic setting by pressing the ⇒ key. When doing this the radiator fan must not run.
                                ‒ Input 06 for "End output" function and confirm with Q.
                                Hope this helps ya mate the computer imo does need to be reset after you have fitted the new earths.
                                Cheers
                                Alba European
                                Service, Diagnostics and repairs. Mobile Diag available on request
                                Audi/VW/Porsche Factory trained tech 25+ yrs exp
                                For people who value experience call 0423965341

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