Long shot is the common ground for the CP's well earthed, you know the black wire with two copper rings! this must be pissing you off no end mate!
i havent checked that geoff. I did notcie that the coilpack bodies were arking out a bit against eh plenum if they arent bolted properly. Im not really annoyed, i like diagnostic work. each problem solved makes you better
Thanks for the offer, a fellow northside zedder offered me to try his blitz ecu this weekend. Ill update then
SOLVED - SOLVED - SOLVED - SOLVED cutting out problem solved today!!!!!!!!!!! Ive been driving the car around alot even though its been cutting out when you're on the berries. I was hoping hte problem would develop a new symptom to make it easier to find. I was right, it developed a misfire when cold that would clear as it got hotter, this morning i decided to track down the miss. First i established which bank was missing, then ran it for a bit while missing, Listened to the injectors, all firing - pulled the plugs on that bank and had a look. number 4 looks like it hasnt been firing . Renewed the plug because it was badly fouled and changed the coilpack. Fixed the miss. Woohoo, went for a drive, fixed the cutting out problem too. The only expaination i have for the cutting out under boost is that the coilpack is working its hardest under that situation and this particular one obviously has some internal failure that doesnt make itself known during all conditions. Perhaps it was sending some weird signal back to the ecu which made it shit itself. Good that its solved and certainly one to look out for in the future. Now to install the AVCR!!!!!!
Thats happened before to 90ttz, coilpack was the problem. Ohms test wont show it either. Well done man!
thanks geoff, yeah testing the coilpack is difficult . I checked them on teh primary and secondary side with the scope and with a handheld coilpack tester, but unless the coilpack is missing when u test it the test wont show it up.
GREAT NEWS ROLLIN Coilpack huh???:bash::bash::bash: Must admit. Coilpack failure seems to be pretty rare (as compared to PTUs) but lately there have been quite a few ...:zlove: Now we just have to get akeizm's misfire sorted. Sounds similar to yours but if his was coilpack related, it wouldn't get better under load (which his does)
Thanks mark, Im delighted its sorted i can finally enjoy the car again. For one coilpack to go down in the way it did was a real weird one for me. Ive replaced hundreds of failed coilpacks, but ive never had one that made the ECU shit itself.
misdiagnosed misdiagnosed but now really solved. After i thought i had it fixed with some 2nd hand coilpacks teh problem slowly returned, i thought it was just another coil on the way out, but as i say its not diagnosed untill its confirmed so i decided to confirm my diagnosis today by trying one of the coilpacks i thought was causing drama on another vehicle. It ran without issue. So i looked at what i may have altered when i changed the coilpacks. Having to remove the balance tube means i disturbed some of the wiring at the back of the motor. Further inspection revealed damaged adn shorted wiring on the knock sensor plug, even though it wasnt connected to the sensor, the wiring was shorting as the motor was moving slightly under load. It has now been diagnosed, confirmed and fixed.
But all that would do is put the ECU in safety map. Really doesn't explain the misfire. Sure the engine will run rough but different conditions to misfire. Not trying to extend your headache but just curious what's actually causing? Perhaps it's a coilpack or injector wire touching?
No you're right to question it mark. Its not a miss really, its complete ECU cut, both spark and fuel. Avcr shows injector duty cycle drop back to idle amount, Im gonan check the earths and other wiring in the area at the back of motor in case i bumped something and have misdiagnosed again
COmplete ECU cutout! Whow. Two sources come to mind. 1: The main heavy duty wiring plug (6-8 wires?) sits at top of firewall to the left and above the brake booster. I've seen a few where there was corrosion or crap built up on the terminals and by just wiggling the loom you could kill the engine. 2: I wonder if it could be a loose/broken wire in the loom from the big relay box on LHS engine back to firewall. That loom feeds the ECU & ignition 12v relays. Also check the six pin grey wiring plug which feeds out from the front of the main relay box behind passenger headlight. That plug carries the ignition and ecu feeds. Hoping # 1 for your sake- easy'ish fix...
Finally got to the bottom of this. and confirmed this time. The intermittent missfire was a dodgy wire on one of the ptu connectors, i got caught out with this because cleaning the connectors and swapping PTU's would sometimes make a difference but it would always come back. a tug test on the wires revealed teh dodgy one. the next problem was the infamous cutting out problem, usually under full load. having swapped every sensor and component for a known good one, even a new chip in the ECU and a motor rebuild it still did it very rarely but not as bad as before. The ecu has just been sitting loosesly on the floor since ive been probing and messing around. While the car was running once i moved the ecu back into position as i had a passenger getting in and it cut out and wouldnt start. Moved the ecu back on the floor and it started, moving the loom cuts it out. Ive got it in a position where its good, now im just going to try and identify if its the actual plug not seating properly or the loom has been chafed. Feels good to have finally solved it almost a year on.
