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05-12-2010, 05:48 PM | #1 |
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Cold start misfireing 2-3 times
After leaving the car in the garage 20-22 degrees C for a longer period (more than 18-20 houres.
The engine missfires 2-3 times when rpm drops from 1300 down to 1000 rpm. I have 500km now and this missfires started after 250-300 km. I use Shell V-power 99+ octane. Somewhere on the line i started to let the engine (turbos) cool down about 1- 1 1/2 minutes before stopping the engine (old turbos needed this) Anyone else have misfires? And the steering! I'm gonna use juhaps poetry about the Volvo and tell BMW how my car handles when initiating a lane-change. Feels like you have to turn the steeringwheel 2-3 cm before the car listen to your commands, In norm, sport and sport+. I hope a bottle of green walking can make an serviceminded tech-guy press the wrong button. and ooops, that was for the 35iS! Well now that it's there we better let it be so we dont destroy anything. Then I'll do this: Other than that it's a superlative vehicle! Last edited by SHADOW4; 05-13-2010 at 09:19 AM.. Reason: terrible spelling |
05-12-2010, 07:05 PM | #2 |
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Shadow, don't know if I'm reading you correctly, but 20 - 22 c converts to 68-72 f, which is fairly moderate temperature and I would consider ideal.
Don't think it's the octane as BMW's programing would kick in to change the timing and fuel ratio but not enough to make it misfire, especially at low RPM's. Additionally, a turbo problem would be more consistent with a a lag rather than a misfire. Normally, a misfire is caused by 1) spark timing, 2) valve opening timing, 3) vacuum leak, 4) lack of fuel or improper air:fuel ratio, 5) bad alternator or battery i.e., low voltage if it sat for a while and partially discharged the battery, and of course a lot more given the computer controlled nature of the engine. Obviously, you need to have your dealer look at it. . Last edited by teagueAMX; 05-13-2010 at 08:27 AM.. |
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05-12-2010, 07:57 PM | #3 |
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Could be the infamous HPFP.
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05-13-2010, 02:58 AM | #5 | |
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NOPE! I refuse! They have to have this fixed on a march-april 2010 build! For your info: My exhaust "pops" every time in "Manual" from 3000rpm and up. Never been above 5000rpm. Normal, sport and sport+ !!! I know you had a post about pops sometime ago. Still in breake in with 500 km so far. |
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05-13-2010, 03:09 AM | #6 | ||
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About the cold start misfiring. I drive for more than 12 years BMW and so now and then, in various conditions, the cars I owned had some problems with this issue. I suspect humidity within the engine system could be the problem in the first seconds of a cold start. EdP Last edited by zEdP; 05-13-2010 at 03:20 AM.. |
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05-13-2010, 03:37 AM | #7 | |
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05-13-2010, 05:35 AM | #8 | |
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Software could fix the vague center feeling just by reducing the electric assistance.
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EdP |
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05-13-2010, 08:38 AM | #9 | |
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I'm curious about this deadline. Please explain. The popping is a product of BMW playing around with the "fly-by-wire" throttle position software setting to give a nice effect at each shift, and sometimes that results in a very small amount of unspent fuel coming out the exhaust pipe. The fuel is still hot and it ignites when it hits the fresh air, making a "pop". |
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05-13-2010, 09:11 AM | #10 |
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[QUOTE=teagueAMX;7310263]
I'm curious about this deadline. Please explain. QUOTE] Just my wish! |
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05-13-2010, 09:35 AM | #11 |
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we've been over this, it's not the gasoline...
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05-14-2010, 04:23 AM | #13 | |
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05-14-2010, 07:37 AM | #14 |
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05-14-2010, 10:59 AM | #15 | |
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I'm not sure, but the pop is caused by a very short period of time an under pressure in the exhaust manifolds? Ed P |
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