boim
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« on: May 18, 2020, 07:14:28 AM »
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Always got into Soft Limp mode and it seems caused by throttle cut when the B_lambts kicked in - seems it persists with any map I tried.
This Thorttle cut/soft limp mode has been there since the motor got top overhaul 7 years ago- was just intended for polishing. Recently rechecked the CR and all chambers got 8.5 - 9.5 CR.
Some graphs, csv, and stock ecu bin are attached. I recently removed N112 and N249. Car is A3, 1.8T, AUM, AT, 150HP, 032LM, ME7.5.
Once I got this throttle cut gone on stock then I will start to follow s4wiki tuhing. Wanted to get the correct starting point first.
Please help.....
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fknbrkn
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mk4 1.8T AUM
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« Reply #1 on: May 18, 2020, 08:11:23 AM »
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Check n75 and it's vac lines first
And actuator leak test
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boim
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« Reply #2 on: May 18, 2020, 08:47:38 AM »
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Check n75 and it's vac lines first
And actuator leak test
All tested and looks good. I have spare n75, exchanged it, still same. I read here in the other topic that it looks strange if the wgdc in full during boost ramp up and it seems happened here. How to fix it? Sent from my ASUS_Z01RD using Tapatalk |
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nyet
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« Reply #3 on: May 18, 2020, 01:29:47 PM »
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provide a proper WOT log.
Put your n249 back in.
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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boim
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« Reply #4 on: May 18, 2020, 02:57:04 PM »
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It's my attempt also to reduce leak risk by dismantling N249, but after reading around here and your direct advice seems I was in wrong direction. Will try to plumb it back in this weekend.
Read somewhere that 1.8T ME7.5 has bugs, I just wondered whether I hit a bug.
It's an attempt to WOT but got the cut before it's there then went into soft limp mode. Will log again with smoother ramp up.
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nyet
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« Reply #5 on: May 18, 2020, 07:44:52 PM »
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Read somewhere that 1.8T ME7.5 has bugs, I just wondered whether I hit a bug.
Of course you didn't. That is utterly ridiculous. |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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nyet
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« Reply #6 on: May 18, 2020, 07:46:18 PM »
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Will log again with smoother ramp up. That's utterly pointless. Not sure you understand the point to a WOT log. DO NOT feather the throttle, we are trying to figure out what is going on with your boost control, not your throttle plate angle control |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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boim
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« Reply #7 on: May 19, 2020, 08:44:12 AM »
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That's utterly pointless. Not sure you understand the point to a WOT log.
DO NOT feather the throttle, we are trying to figure out what is going on with your boost control, not your throttle plate angle control
Pardon my ignorance. I got it now with gear2 and gear3 WOT - it got cut even before 10sec  |
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nyet
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« Reply #8 on: May 19, 2020, 08:56:53 AM »
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No codes?
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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nyet
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« Reply #9 on: May 19, 2020, 08:58:31 AM »
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Thats not throttle cut. Thats a massive boost leak. Probably out your DV judging from your MAF readings.
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« Last Edit: May 19, 2020, 09:00:36 AM by nyet »
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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boim
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« Reply #10 on: May 19, 2020, 10:20:41 AM »
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I believe no code on Gear 2 and Gear 3. Got code below on Gear 4 when I got (hard) Limp mode; ASC light on, being AT stuck in Gear 4.
16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-10 - - - Intermittent
Always got that code when I hit Limp mode; got no code on soft limp mode.
with some randoms map, I could reach 1.1 Bar (16 Psi) with 140s - 160s g/s MAF; but I need to carefully feather the throttle.
Coult it be MAP sensor faulty? I never replace it in this 7 years, might be it's now 17 y.o already (never changed at all).
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nyet
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« Reply #11 on: May 19, 2020, 10:28:23 AM »
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Please just check your DV.
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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boim
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« Reply #12 on: May 19, 2020, 10:37:15 AM »
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from last random map I logged
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boim
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« Reply #13 on: May 19, 2020, 10:40:20 AM »
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Please just check your DV.
I have cleaned the DV also tried with blow to Atmosphere BOV from other car - got no luck But, sure will recheck the DV also plumb back the N249 this weekend. Thanks Sir for your help -- will get back once two things above done. |
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nyet
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« Reply #14 on: May 19, 2020, 11:09:48 AM »
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blow to Atmosphere BOV from other car - got no luck Dont do this. But yes, it is possible it is your MAF if you keep seeing that MAF too low code |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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