Sorry for the long post, but I would realy appreciate advice from anyone with good technical insight so please read on... I have just reassembled from plenum pull and she is running on 3 cylinders... Number 1 3 and 6 are out of action as best I can tell. I have spent the last couple of nights trying to diagnose with no luck so far, here's what I have found: Lifting coil connector has not affect on cylinders 1 3 and 6. I have checked spark on no. 1 and is OK. I cannot hear no. 1 injector clicking whilst idling. It sounds like no. 1 does click when turning Cam position sensor by hand....:unsure: I have measured 12V at the injector connector on no.1. I replaced all of the injector connectors, so it is possible that they are open circuit, but I doubt it... I have cleaned other connectors TPS, CPS, PTU. I have measured voltage at the ECU Terminals for TPS and CPS. Cam position sensor voltage was slightly above book range at horrible rough idle (500rpm). Two voltages are listed 1.2 to 1.4V was OK and 2.4 to 2.7 was at 2.74. Is supposed to be RPM dependant so I expected it to be lower... I do not know if this is significant. My gearbox neutral switch does not appear to be working as voltage did not change at ECU when slipping in and out of gear. I do not know if this is significant. I'm about to head out into the cold again and do a continuity test from injector no.1 connector to ECU (if I can figure out which ECU pin to use) Can I test injector by simply applying 12V accross terminals? Any advice regarding possible causes is appreciated.
Sounds like PTU to me.. if it is a series one unit they have a... habbit of just shitting themselves without warning.
If he has spark but the injectors aren't clicking why would it be PTU? The PTU cry is almost as prominent around here as "BLOWN TURBO's, GET YOUR CHECKBOOK" cry. But I concede...it's usually pretty well on the money. Did you remove your ecu at all? The injector wires are on the very end and if not reconnected properly this is generally what happens. Make sure you tighten that bolt properly. I have been a culprit of after hours of work, being in a hurry to bolt that sucker back up and not doing it up properly and feeling that dispair when she farts along on 3-5 pots. To answer your qu if you apply 12v directly to an injector and it should click. Check you've got the right plugs on the right inj's as well, did you label them before the pull? Also check fuel availability, you may have pinched a fuel hose when you replaced the plenum. edit: also you said you replaced all injector connectors?? 2 points...did you get them the right way round? ie - to - + to +? Also you might have dodged them somehow. I highly doubt 3 inj have all rooted themselves at once. Test them with the battery, then go back and look at your wiring.
Re: If he has spark but the injectors aren't clicking why would it be PTU? Thanks for the thoughts. I have not removed the ECU connector. I did not label the injector connectors but cannot see how I have them wrong. The left side injector has the fuel temp connector with it so must be right... At idle the manual stated that the injectors all fire simultaneously, twice per cycle so again having the injectors connected incorrectly sould not cause my probblem. It is a series 1 PTU but I do not believe in coincidences, it may be dodgy but I doublt that it's the cause. Far more likely to be the mechanics fault (me) :thumbsdown:
no but having them wrongly wired would. forget the PTU, it's all about spark. You've tested the spark and it's okydoky. So look at whats not working, the injectors. What did you touch with the injectors? You changed the plugs. Ok. Look at your plugs, are they wired up the right way? The lugs on new injector plugs can sometimes push through the top, depending on how you attached them.
the first thing i would do is check the ecu connector secondly.. did you just change the connectors? or has the car been running since then? do more cylinders fire up off idle? do you definately have spark on those cylinders? (if your unsure, pull out a coil pack, put and old spark plug in it and rest it on the plenum so that the thread earths ok)
I have not had ecu disconnected, so it's connector should be fine shouldn't it??? I have only just reassembled from plenum pull & plug replacement so is almost certainly someting ascosciated with that proccess. does not improve much (if any) with revs, still misses badly. I have pulled no. 1 plug pack and I have spark.
No. 2 injector clicks happily when I apply 12 volts, no. 1 does not want to cooperate... More testing tomorrow. It appears that I may have 3 dead injectors! Resistance across terminals of no. 1 is 13ohms, same as no. 2. How fragile are the injectors? I was careful with them and did not drop them or leave them rolling around the boot of my car! They were cleaned and flow tested OK. Any thoughts?
im not sure of the internals of this particular ecu.. but from my knowledge of others you may have shorted something a rooted one of the injector drivers (assuming the TT has 2 injector drivers) id double check all of your rewiring on that side, redo it if neccesary.. no way youve stuffed 3 injectors at once if one of your wires are shorting across each other then that could just be causing them not to fire, all injectors are wired together in parallel. (maybe one for each bank.. actually come to think of it.. they must be 2 seperate injector drivers as they can run 2 seperate a/f ratios and have 2 different a/f corrections. so.. id definately untape/remove heat shrink whatever and make sure one isnt shorting out
i have a simular problem ecpect its only one cylinder...try changing the ecu u may have spiked the injector drive...i havent solved my problem yet but this the last thing i have to try as the injector clicks if another plug is put on it...just waiting for new ecu to turn up... try putting the oppisite cyl injector plug on it and test for clicks...or buy yourself a injector light testor...these test your plug for voltage and flash if they are working got mine from repco for 13 bucks trade
Ive a N/A not a turbo... The battery was out the entire time the wiring was being modified. Do not believe I have a short at the moment, but will be buying a test light as suggested by wa_xz to see if I'm getin the signal to the injectors. Dead cylinders not all on one side.:wacko: so I think that does your dead driver theory? (I may have the cylinder numbers wrong. front right, back right and back left cylinder are dead) I do not believe that the Z injectors are connected in parrelel as they run sequential injection except at idle, as noted in my previous post. Each injector is wired individually back to the ECU.
definately not sequential.. dont know where you read that yeah.. your numbers are wrong.. but still wouldnt make them all on one side 1,3,5 down one side 2,4,6 down the other (1-6 follows the order of the holes in the lower plenum) the fact that theyre 2 on one side and one on the other stuffs my theory up.. dunno man.. i can only suggest that your wiring is up the duff.. wont be the ECU then make sure the pins are seated in the connectors properly, i remember 2 of mine pushed back up into the housing when i first plugged em on, because they were clicked into place properly in the plug..
A few things to check >>> 1. Loom connected correctly? Very easy to get a few coil pack or injector connectors back to front. 2. Injector ohms test should show approx 12ohms across terminals. 3. Continuity test of injector wiring. 4. PTU connectors bright and shiny - weak spark (or no spark) will have fouled plugs. 5. Clean or swap spark plugs.
Re: A few things to check >>> I have looked carefully at the harness and cannot see how I could have swapped any of the connectors, it appears to only fit one way. Can you please explain which connectors can be incorrectly installed? Injector tests OK with meter but did not click when 12V applied to terminals from torch battery. this was crude and I will retest tonight. I will be getting a injector test light today. I was thinking that all that is needed is a 12V led stick it into the connector and it would light when the injector is supposed to click... Anyone tried this? Otherwise to do continuity test of wiring I need to know which pin on ECU carries the injector signals... Anyone? PTU terminals cleaned, connector cleaned as best I could but not completely satisfied with ability to clean these, thats why i replaced the injector connectors... sparkies are near new iridiums, only did a few hundred k's before pulling of the road. I will pull tonight if injector testing does not show up problem. Thanks for your comments!
Service manual shows each injector negative running individually back to the ecu. wiring diagram And page 22 states "two types of injetion are used - simultaneous and sequential" Description Cylinder numbering: I was misled by the number 4 on the plenum inlet runner to cylinder number 2... So it is No. 1, 5 and 6 that are not behaving.
Spark plugs foul very easily Have you had ECU disconnected? Is ECU loom connector fully engaged? Coil pack connectors can be mirror-reversed, ie: cyl 1 to cyl 2; etc. Check 5 & 6 injector(also IACV connector)are correct. Injector to ECU pins:- 1:101 2:110 3:103 4:112 5:105 6:114
Re: Spark plugs foul very easily ECU has not been disconnected. I'll check plugs tonight and connectvity to the ecu pins.
How about the Injector earth ! Did you re-instal this as this may affect the injectors. MattB:thumbsup:
Re: How about the Injector earth ! injectors are insualted from the fuel rail.. shouldnt be any connection, so shouldnt effect operation
