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Leaking Injector Confirmation (pics)
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04-18-2021, 04:31 AM | #1 |
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Leaking Injector Confirmation (pics)
Hi again everyone.
Following my previous oil issue, I suspect I have leaking injector/s. Im running mhd stg 2+ with cold start delete. I've read that this can cause the occasional stumble at startup. I do have a little stumble on startup, that I suspected was this, however it is like 1 in 5 times now. It does appear to be getting more common over the last 4 months or so. This stumble last less than two seconds max before she idles smoothly. It fires on the button and as the cold start kicks in and drops the idle rapidly it has a stumble down the picks straight back up and levels off slightly higher than usual. I suspect injectors due to bank 2 afr been dipping a little when off the throttle coasting, like a second or so delay to fully level off, then the occasional spike richer. This only last a second or two before leveling off. , compared to bank one. This afr issue has only developed over the last 2 weeks or so. I'm not throwing any codes or anything, but would like to get ahead of the game as much as possible before a serious leak. Thought I'd throw in the fact I'm on all new coils and plugs 5k max. And I'm on index 12 injectors, not sure of age as they were present when I bought the car. Can someone please confirm? I was hoping one would be black and sooty, or even wet. Plug 4 maybe had a little condensation on it as I pulled it out but was gone in a second or so by the time I got into some light. Regardless plug 4 and 5 look a lot wetter on the threads and smell very slightly different. Especially 4. I would expect different amount of contamination to have different strength smells, however I'm not sure if this indicates a slight leak. I also just used a clean vacuum line to smell into each recess, they all smell relatively similar. Nothing massive stands out like opening a can of petrol lol. Thanks! Wadger Last edited by Wadger; 04-18-2021 at 05:22 AM.. |
04-18-2021, 05:57 AM | #2 |
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Does it still stumble on start up if you turn the cold start idle control back on? I convinced myself I had leaking injectors due to a lot of what you described...I changed them out and it still stumbled at start up. Turning off the cold start delete fixed it...
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04-18-2021, 06:04 AM | #3 |
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I haven't turned it off(back on I suppose lol) for two reasons really.
- I leave home at 5am and I have the pe mod which makes it a bit loud lol. - The main reason now is because I have the problem with oscillating afr and surge at steady speed. When I reflash its pot luck how severe it is. Took me ages to get rid of(redeuce) it this last time. I know this sounds crazy but I've been through the process atleast 4 times now. Then bang a reflash fixes it... The biggest pointer for me was the dip in afr when coasting. Bank 2 sometimes takes a little longer to reach 295 and then once up there it occasionally has a spike or so rich, indicating a leak? |
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04-18-2021, 06:14 AM | #4 |
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This is the worst one I logged.
Not happening too often but this indicates a leak? Would rather not replace them all in bank 2 if 1 or 2 are still in working order. Also probably worth mentioning I use the 'softer' exhaust burble on sport only for a 1sec duration. Last edited by Wadger; 04-18-2021 at 06:20 AM.. |
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04-18-2021, 07:44 AM | #5 |
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Drives: 2007 Black/Black 335i e90
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Have you checked your lamda readings on both banks while cruising? I think it's normal for a tune to run a little rich.
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04-18-2021, 08:12 AM | #6 |
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Both banks are monitored, it does run a little rich but both seem to be close enough to each other.
As you can see in the log picture, bank 1 stabilizes immediately after letting off, however bank 2 fluctuates a little. I assume this means bank 2 is leaking a little unaccounted fuel? |
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04-18-2021, 02:42 PM | #7 | |
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Drives: 2007 Black/Black 335i e90
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Quote:
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04-18-2021, 05:47 PM | #8 |
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Drives: 09 E92 335i 6MT
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None of those plugs look like they have a leaky injector imo. The tip would be pitch black, but looks like all of the tips are clean, just looks like there may be oil on the threads.
Also, I've noticed something like this on my bank2 as well so very interested to see if you find a solution. Doesn't seem to happen often so I haven't worried much lol
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09 E92 335i 6MT / Alpine White / Coral Red / VRSF 7.5" / VRSF DCI / VRSF Catless Downpipes / VTT Charge Pipe / Turbosmart RacePort Gen V / RB OEM Billet Turbos / CD919 Custom Tune / Bilstein PSS9s
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04-19-2021, 10:06 AM | #9 |
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This certainly doesn't look right. IDK though...I'd probably try to find an opportunity to turn the cold start delete off first. Like I said...I changed injectors because I was convinced I had a leak and it turned out to be that cold start setting...
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04-23-2021, 02:03 PM | #10 |
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Ever find a solution to this? Noticed it happening more today during my drive. Planning on warrantying my bank 2 injectors, if it doesn't solve it i'll warranty my front 02s and replace the rears.
I took a look and i'm wondering if my rear wastegate arm is hitting the vband, doesn't look like it would be but it is kinda close. Also, are you running V9.0? Wondering if it's tune related.
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09 E92 335i 6MT / Alpine White / Coral Red / VRSF 7.5" / VRSF DCI / VRSF Catless Downpipes / VTT Charge Pipe / Turbosmart RacePort Gen V / RB OEM Billet Turbos / CD919 Custom Tune / Bilstein PSS9s
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