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Thread: 1.4 16v AFH Kangarooing and Stalling at idle

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  1. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
    #11
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    I have the diagram but in German.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
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  2. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
    #12
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    Ahh not to worry, I wont be able to read that! I’ll sus it from the colour of the wiring.
     
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  3. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
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    I’ve spent the morning removing the loom and checking it over.

    Pin 24 from the ECU to pin 2 of the coil seems fine. I shook the wiring around while testing for continuity and the figure didn't change.

    I wish I’d noticed this sooner, but it seems the EGR valve (N18) and EVAP system (N80) has been removed by whoever had this engine last. Which I suppose is whats tripping those codes.

    This leaves just code 00525 and 00609. For 00525, I found the wiring sheath on the engine loom side just before the O2 sensor plug had cracked, exposing bare wiring on pins 1 (red/yellow) and 2 (brown). However the wires weren’t touching so I’m not sure how much of a break through this is.

    For 00609, as I said earlier the coil wiring seems fine. I’ve tested another oem coil which came from the donor car and I had the same symptoms.

    So after all of this I’ve reached a point where I’m not really sure where to go next. Should I purchase a new Bosch coil or look towards replacing the ECU?

    Jack
     
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  4. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
    #14
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    ECU failure is extremely rare, transformer style coil failure is extremely common.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
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  5. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
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    Hi Crasher,

    Feel I should preface this message with Merry Christmas!

    I managed to get my hands on a genuine Bosch coil for the Polo. I threw it in, and unfortunately the problem remains. I've attached a video which really shows the idle symptom. I've run out things to replace now, its very frustrating. Please take a look at the video, and let me know if I should be looking at something particular.





    Thanks again,
    Jack
     
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  6. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
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    It would be nice to reinstate the missing emissions equipment which probably includes the cat? Does it start and run OK initially, going off as it warms up? What is being used as a downpipe and system until way after the Lambda sensor? Where is the lambda sensor and have you tried running it unplugged? I expect you do not have access to a four gas or at least a CO meter, that exhaust looks extremely rich, does it smell very heavily of fuel? Do you have a multimeter?
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
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  7. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
    #17
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    It starts absolutely fine. This video was recorded immediately after starting the car. Its the original 6n downpipe, with an appropriate flange joining it to the mk2 polo exhaust system. The o2 sensor is in what I presume the standard location, just before the downpipe flange. I have not tried running it unplugged, but I can pop down and try that. When its idling without problem, there's practically no exhaust smoke and no smell. As the problem begins, the smoke becomes thicker and smells of fuel until it dies.

    The donor car, which was set up in exactly the same manner didn't have these issues. It was driven for 2 years without issue, before being 'reshelled'.

    Everything was removed from the already afh swapped donor car and fitted to this one. And the problem was there since day 1, once fitted to the new shell. The donor car sat for around 2 months, in the dry. However stupidly I never scanned it for codes prior to doing the swap into the new shell.

    I have a multimeter and electrical tools. But nothing more specialised than that, other than vcds.
     
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  8. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
    #18
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    Can confirm, with o2 sensor unplugged, it behaves the same.
     
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  9. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
    #19
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    The symptom reminds me of a Golf 2 G60 conversion I did around 25 years ago when I was still leaning the basics of electronic engine management. It would start and run beautifully but after a couple of minutes from cold it would start to go off and the CO reading would go from the 0.7% I had set doing basic settings and gradually climb to 12% and splutter to a stop. If the lambda sensor was disconnected it ran fine. I had no idea if the donor car did this as it was a stolen recovered damaged Rallye and it drove me round the bend for days until a chap at the rolling road it was booked in at suggested I measure the lambda voltage at the ECU. After starting this just went upto 1v and stayed there so the ECU reacted by pumping in more fuel and everything was brand new, genuine Golf 2 G60 downpipe into a Suprsprint cat bypass with the correct lambda sensor for non cat models and the supplementry relay. What the 1v reading meant was the sensor was seeing oxygen and I found the triple layer steel shim genuine gasket was allowing a tiny leak of air in and across the sensor, so tiny it did not leak out. I fitted an aftermarket one piece gasket and it cured it. Unfortunately you having the same result with the lambda sensor unplugged destroys that theory UNLESS there is a wiring fault putting a voltage up the sensor signal wire. Try running it with the blue coolant temp sensor disconnected.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  10. Re: 1.4 16v AFH Kangarooing and Stalling at idle 
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    Hi Crasher,


    I’ve been outside this morning to unplug the coolant sensor and try it out. I expected no change, however what happened was very odd.


    Coolant sensor was unplugged before starting engine, its been sat for at least 36 hours without starting.



    • Engine fired right up, not a seconds hesitation.
    • Exhaust was clear, but got thicker over time. The engine ran for around 8 minutes before it began to cough, however it was no worse than the occasional stumble. No stalling this time, and much better than in the video you watched.
    • I gave the engine a small blip of throttle. This raised the revs to around 1300rpm. The revs did not drop down again. They sat around that rpm. The exhaust smoke cleared up, to the point of there being no visible smoke.
    • The engine was extremely steady at this rpm, however after 5 minutes it had still not dropped down, but it didn’t cough or stumble at all.



    So in conclusion, the engine ran for almost 15 minutes without fail. Which beats its current record of around 1 minute. It seems happier at higher rpm, but clearly something isn’t right if the revs are hanging after being revved. I did also notice that the first few degrees of throttle rotation did not change the idle speed, it took what seemed more than a normal amount of rotating the throttle to result in anything - however this could be trivial. I switched the engine off, as to not irritate the neighbours and will leave it to cool off before going back to it.


     
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