07-18-2018, 03:11 PM | #1 |
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acceleration hiccups
hey you guys so I have been having this problem for some time now but have been ignoring it
I got some other stuff fixed on the car now I want to get this taken car if So on sport mode I notice that when I do a slightly hard acceleration or hard acceleration I get like misfires it hiccups like even a burble at mid Rpm even tho I'm pressing the gas pedal and some times a big cloud of black smoke The car is stock only thing is muffler delete and bms intake you think is a ignition problem Maybe new coils packs Sparks was replaced at 55k Car has 68k now or is it carbon build up Maybe I need a walnut shell blasting or ????? Anyone have any suggestions or opinions By the way I do not get a check engine light or nothing
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07-19-2018, 07:07 AM | #2 |
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First thing you want to do is check for any problem codes with an OBD-II code reader - they don't always produce a check-engine light. Could be a bad coil pack or injector issues - I'd have those checked. Carbon buildup would likely not produce the misfire or black smoke you mentioned.
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07-19-2018, 09:37 AM | #3 | |
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07-19-2018, 11:09 AM | #4 | |
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07-19-2018, 11:11 AM | #5 | |
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Ima look in to that today
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07-19-2018, 01:26 PM | #6 | |
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the car runs great I only feel this when I have the pedal like 50 to 85% Once I hit the button on the bottom of the pedal The car pulls smooth no problem no hiccups So idk if that helps a bit
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07-19-2018, 01:29 PM | #7 | ||
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I just got that checked at a local shop No codes pop up never has I been having this issue for quite a while Even when I had jb4 At first I thought it was jb4 so I removed it Now I'm stock and I still have the same issue But never saw a check engine light or a code for this So what you guys think Maybe carbon build up ?
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07-19-2018, 01:35 PM | #8 | |
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07-19-2018, 02:14 PM | #9 |
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https://www.fcpeuro.com/products/bmw...-12131712219x6
can anybody confirm that these would be the correct ignition coil pack aro buy for my car ? Or is there another brand that's recommended I'm thinking of starting off with coil packs and see if that helps my problem
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07-19-2018, 04:17 PM | #10 | |
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07-19-2018, 04:18 PM | #11 | ||
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07-19-2018, 11:42 PM | #13 | |
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The bms intake I just installed maybe about a week ago I have been having this issue way before the intake
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07-20-2018, 05:22 AM | #14 |
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If you do get a walnut blast done. can you please post picture of what your intakes looked like before the blasting?
I just want to see how much build up there was. Also you did everything for your problem except Walnut blast, so try it. or at least have them inspected. |
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07-20-2018, 07:51 PM | #15 | |
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Then Next will be walnut shell blast
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07-20-2018, 08:24 PM | #16 |
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Sounds kinda like LSPI (low-speed pre-ignition). I only say that because of the black smoke, otherwise I wouldn't have thought of it. This happens in low rpm, but high load conditions, like 50% throttle at 2500-3000 rpms. I'd read about LSPI a bit and see if that sounds like the issue you're having.
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07-20-2018, 08:56 PM | #17 | |
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07-21-2018, 12:48 AM | #18 | |
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I did read and saw some videos and they said something about high gear and building up boost on a high gear and having Miss fires But my car is doing it on 1st 2nd 3rd lol Is like a constant hiccups all through gears from 1-8
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07-21-2018, 07:31 AM | #19 | |
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07-22-2018, 10:05 PM | #20 | ||
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When I had jb4 Had the same exact problem I think is the coil packs
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07-23-2018, 05:22 PM | #21 |
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I had a similar problem. Was worse with the piggyback but present even without. Car was otherwise stock. Dealer replaced coils and plugs @ 55k and it went away. 12k miles later and it's back....
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07-23-2018, 06:08 PM | #22 |
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This happened to me at WOT throttle only. It didn't always throw a code. It would throw a code maybe after 3-4 back-to-back WOT runs. Cylinder 6 misfire. Only happened on my BM3 tune though. I ended up replacing the coil packs and everything is fine now.
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