TijnCU
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flying brick
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« Reply #15 on: April 12, 2016, 10:24:42 AM »
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If you log on high sample rate you should be able to see what changes first, throttle angle-injector-ignition or even maf. Rpm will follow this change. Might narrow down the search. My car has a rock solid 880rpm idle with or without exhaust, at any temp. Both narrowband and wideband controlled same result.
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nyet
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« Reply #16 on: April 12, 2016, 10:28:20 AM »
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see what changes first, throttle angle-injector-ignition or even maf. Rpm will follow this change. Might narrow down the search.
Thanks, I'll take a peek! Any other insight as to what happens at 90C in the ECU would also be helpful. |
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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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TijnCU
Hero Member
Karma: +60/-4
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Posts: 690
flying brick
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« Reply #17 on: April 12, 2016, 02:47:35 PM »
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There are additive warmup timing maps that are temperaure enabled, and I also have had my car feel like the pedal behaved different/less aggressive during warmup. (On apx 512kb) For example with cold motor I needed to push the pedal over 50% to get any boost and with hot engine it would shift to 30% pedal. I thought it had something to do with load request during warmup, could as well be influencing your idle area. Cant give you any map names from the top of my head, I'll look into it.
Have you tried to fit another o2 sensor from your own car for example? O2 sensors are notorious for messing up idle too...
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prj
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« Reply #18 on: April 13, 2016, 12:50:17 AM »
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Yes that sounds correct in my ears and I will not argue with that.  But i have experienced very unstable idle when I example wise took of the headers on my old 5cyl s2. Because lambda was not reading right. |
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dream3R
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« Reply #19 on: April 13, 2016, 05:43:20 AM »
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Same here around 400 - 800 rpm.... I happened when i changed Exhaust+Intakemanifold. This occured also before i tuned my engine (OEM MAF + Injectors + OEM File) when i had the exhaust system disconnected (O2 sensors connected).
My theory is that the idle is very fine tuned agains the backpressure of the OEM exhaust system.. It feel like a value in a PID loop somewhere need to be adjusted. The "P" factor should be lowered abit.. hmm or maybe more timing advance @ idle to keep it alive.
What is p/w dream3R?
Injetor pulse width, one my car it need to be around 1,3ms
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nyet
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« Reply #20 on: April 13, 2016, 01:04:29 PM »
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I zeroed out the warmup fueling maps for 50 (or 60? Forgot what the 2nd to last temp is) and up, no effect. O2s are fine, like I said the idle is rock solid down to 760rpm at 90C
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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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dream3R
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« Reply #21 on: April 13, 2016, 07:58:35 PM »
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Ignition oscillate a lot during warm up?
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Jim_Coupe
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« Reply #22 on: April 13, 2016, 11:38:18 PM »
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But isnt there a map with Idle ignition or is it just as simple to adjust timing in the main timing maps? I want to ad more ingition at idle.. MY theory is that it will be more stable then.
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E85oholic
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dream3R
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« Reply #23 on: April 14, 2016, 12:05:32 AM »
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I think you have i vice/versa mate  |
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contrast
Full Member
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Posts: 215
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« Reply #24 on: April 14, 2016, 01:08:01 AM »
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I had similar issue with one Volvo. Warm engine idle was pretty much ok, but cold start it started oscillating. Also it was was worse when AC pump engaged.
Tweaked MAF scaling a bit since the required airmass for this engine was way off with bigger MAF.
Instant success.
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nubcake
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« Reply #25 on: April 18, 2016, 04:59:21 PM »
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Wild guess about nyet's case is KFRLMN.
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nyet
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« Reply #26 on: April 18, 2016, 08:31:59 PM »
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Im guessing I have too much maf underscaling. Will also recheck KFRLMN
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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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ReiterPerf
Newbie
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Posts: 23
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« Reply #27 on: January 04, 2018, 08:50:32 PM »
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I am having an issue with an oscillating Idle once it hits 90 deg that continually gets worse till it will stall if you leave it. I will include a clip(do to upload limits) from the log from a cold start to when it starts oscillating. It seems that it goes rich first then throttle and timing go nuts. injector on time and DC don't seem to change. I suspect TEMIN which I haven't been able to find in this file. The idle is not bad for the first 880 seconds.
Car is a mk4 jetta 24v turbo 022906032BM 366145
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