07-20-2021, 12:45 PM | #1 |
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So, had the new crank hub installed, VRSF Catless DPs, and colder plugs installed. On cold or warm start, the car will rough idle for a few seconds and then die. Start it back up and it does the same a few times, and then it rough idles for a few seconds and then idles smooth. Any idea what might be up? Anyone else experienced this? Maybe I need to reflash it? Searched the forums and found a few possibilities, but nothing that really pointed to what I was seeing. Thanks!
Stock turbos Eventuri intakes SSR DPs NGK Plugs @ .23 BM3 Stage 2
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07-20-2021, 01:57 PM | #3 |
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Not that I could tell. I'd assume timing would kick a code. It runs strong as hell. I ran an R8 on the way home and he didn't start pulling on me till 150mph+. FYI, this was on the autobahn. Anyhow, didn't happen till after I filled it up with gas. Could be bad gas, but I don't think so. Idk.
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07-22-2021, 11:54 AM | #4 |
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No obvious problems with the parts you picked…
1) Reflash, reset adaptations, restart car. 2) Remove MAFs and check for cleanliness, lightly grease their O-rings so they seal tightly. Also check skinny air pipe between long intake tube and J-pipe, thick grease those O-rings. 3) Pull plugs and re-check insulators and gaps. Examine injector and coil wiring while you're in there. One time I had a new NGK with an insulator crack hiding right behind the ground strap. Car idled like crap but spun up fine. Was hard to find…no codes to chase.
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07-23-2021, 07:24 AM | #5 | |
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07-23-2021, 08:03 AM | #6 | ||
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07-24-2021, 06:52 AM | #7 | |||
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07-24-2021, 03:37 PM | #8 |
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These cars are super duper sensitive, especially if you are tuned.
I would gap to .022 on NGK 97506s next time. Also change out your coils while you are at it. Make sure you also run fuel additive once in a while and use ethanol treatment every tank if you run full e85 some day…
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07-24-2021, 06:20 PM | #9 | |
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Could be your intake; common problem on the aluminum intakes. I would also assume plugs. |
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07-24-2021, 06:46 PM | #10 | ||
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07-25-2021, 06:39 AM | #11 | ||
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07-25-2021, 06:40 AM | #12 | |||
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07-25-2021, 08:27 AM | #13 | ||||
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I replaced coils at 35k after gapping plugs for full e85.
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07-25-2021, 10:07 AM | #14 | |||
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I had the exact same problem in the winter and it was infuriating; went back to stock intake and it cleaned up. |
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07-25-2021, 11:31 AM | #15 |
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Going back to stock intakes should always be an early or first step in diagnosing rough idle.
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07-26-2021, 01:13 AM | #16 | |
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- Removed aftermarket intakes - Installed OEM intake with paper filter - Clean MAF sensor - Swapped new maf sensor - Fixed some wiring issues on flex fuel related to the ethanol sensor - Changed to flex fuel plugs and adjusted gap to .020 per Cary Jordan - Disabled cold start - Disabled start up roar When I disabled start up roar, my idling issue went away. Seems like start up roar gets confused with ethanol mixes and caused my choppy idle.
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07-26-2021, 10:58 AM | #17 |
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Never had an idle issue with the Eventuri. I did with the BMS.
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07-27-2021, 08:00 AM | #18 | ||
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07-27-2021, 08:03 AM | #19 | |||
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07-27-2021, 09:06 AM | #20 | ||||
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