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S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
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Problems won't go away. What else could there be?Views : 16396 Replies : 144Users Viewing This Thread : |
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Apr 13th, 2021, 22:38 | #91 | |
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It doesn't work that way. If the injector is faulty and it is moved to another cylinder, the fault will move with it - you won't have 2 pots misfiring. If the fault is staying on the same pot, the fault must be in the wiring or control circuitry for that pot.
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Apr 13th, 2021, 22:52 | #92 | |
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The wiring was checked twice and was in the clear both times. I want to check for myself though, I'll order some noid lights to see if it's all good. |
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Apr 14th, 2021, 17:57 | #93 |
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Just a thought, could there be a dry joint on the output stage (transistor?) on the ECU stopping the signal ever reaching the wiring that’s tested ok?
I’m not completely sure how the injectors get a signal to fire. Also does it always misfire on number 4? If so, have you tried a little easy start in the inlet tract with the engine running? If it’s the injector/signalling I’d expect that pot to briefly pick up. Diesels knock there head off on that stuff, just to warn you! |
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Apr 14th, 2021, 19:59 | #94 | |
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Apr 14th, 2021, 21:15 | #95 |
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I think I have to know if swapping 4 and 5 injector makes a difference. Its injector, cylinder head damage due to timing belt snap, ecu or wiring. If the problem moves with injector I think that's the best possible outcome.
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May 2nd, 2021, 19:15 | #96 |
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Tested injectors, injector signals as well as fuel delivery
Since my last update I've done a bit of testing.
Received my noid lights and went to test the signal, to see if the noid lights will light up. All of them did as well as saw that fuel was being pumped through the fuel lines. So no fault there. Received all my parts with which I could test the injectors with. Took a while because the first signal generator didn't work with my injectors, so had to get a different one. Tested each injector and all worked perfectly fine, even the 4th cylider one that had the fault code. Everything checks out. Don't know what's left. Have to check the recently replaced swirl flaps? Will have to put the injectors back and maybe swap them around. Maybe something changes then but last time it didn't, so not sure. Last edited by venomtail; May 2nd, 2021 at 19:30. |
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May 2nd, 2021, 20:28 | #97 | |
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Might be an idea to take a video with your phone as that will highlight whether they're pulsing or not. (different frame speed on the phone camera to the frequency of injector pulses will show up as a slower pulse of light from the NOID lights) If they all pulse evenly then the fault doesn't appear to be the injector or the control - if #4 (the suspect cylinder?) is on more or less than it should be that is likely to be the fault.
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Jun 3rd, 2021, 10:00 | #98 |
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New day, new problems
Been trying to put back the injectors we took out but now the engine wont start. Checked all the fuel lines and they are working fine, bleed the fuel system and the fuel is being delivered to the injectors, however still nothing. Checked the connection of the injectors with my Noid lights and not a single cylinder is being lit up by it. Must mean no signal is being sent to the injectors and I can't figure out why. DICE doesn't mention anything about injectors.
[YOUTUBE]https://www.youtube.com/watch?v=aTNlozm0VAw[/YOUTUBE] Also, Putting back the injectors we've found out that the threads for 3 of the injectors (2,3,4) have been stripped and the bolts just infinetly screw when tightening with your fingers. We've made new threads and the injectors now sit nicely, just now I'll know to not go to any garage... How can someone strip something so important and not tell us? On a side note, checked the swirl flaps. They're like new. No build up or any wear in the slightest. Kinda don't know where to go from here. Will have to look up how to diagnose no signals being sent to injectors issue. |
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Jun 3rd, 2021, 11:03 | #99 | |
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https://www.atpelectronics.co.uk/ Testing and reporting on the ECU is i believe ~£50, repair tends to be ~£300 but if you have the repair done the testing/reporting gets included in that. If it's not the ECU, it'll cost £50 ish to find that out, if it is, about £300 to have a guaranteed unit come back to you. These prices are approximate based on fairly recent experience, they may vary as they were for an earlier Volvo than yours but gives you an idea.
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Jun 3rd, 2021, 14:32 | #100 |
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Just put in more fuel and tried to bleed the fuel system again
and for a minute I got the engine to run. GOOD NEWS! I just need to bleed the system again, maybe look up again on how to properly do the process, cause I'm messing up somewhere. |
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