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06-24-2010, 11:53 AM | #1 |
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Cold start, engine choking
Still unsolved for my 23i
Every morning when I started the engine, the engine start to choke, engine RPM is not stable (running between 800-1,000 rpm) , If I drove off immediately, the car will dance like someone is choking. If I let the engine warm up for a few minutes, no problem. Went to BMW service 2 times, no fault in the computer, increase the idle PRM from 600 to 800 RPM, still unsolved Anybody can help, I suspected fuel pump issue??
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06-24-2010, 12:02 PM | #2 |
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Let it warm up for a couple of minutes anyway, it gets the oil circulating and prolongs the life of the engine. In perspective...How well do you function the second you wake up ??? As for running rough...no answer there, mine is pretty smooth (not a 2.3 though).
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Member ZSCCA 2009 Z4 s35i with Dinan Stage II software, Sport and Exec packages, 19" 296 rims , a stubby and mud flaps
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06-24-2010, 01:23 PM | #3 |
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Software more likely. At cold start the computer is supposed to feed in a little more fuel. Sounds like your may be running lean. increasing the idle is not the answer.
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06-24-2010, 01:33 PM | #4 |
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My 3.5i takes a long time to turn over, then when it does it chokes until I give it some gas. Had the HPFP replaced last month. Each time I start it, I keep my fingers crossed that it will. Taking back to dealer again next week to check out..... among other things. Also Check Engine light just came on.
My 6th BMW and the most problematic of all of them. |
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06-24-2010, 02:15 PM | #5 |
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Do not have to worry about that down here. There is NEVER a cold start as the temps are in the 90's most of the time !!
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06-24-2010, 03:06 PM | #6 |
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So it's a DAMP start then......I was waiting for a smart comment from someone in the tropics
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Member ZSCCA 2009 Z4 s35i with Dinan Stage II software, Sport and Exec packages, 19" 296 rims , a stubby and mud flaps
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06-24-2010, 04:51 PM | #7 |
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Report from the Tropics...
My 35is is taking forever to start. Damn thing wont be ready for delivery for another week or so! Arghhh!
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06-24-2010, 09:15 PM | #8 | |
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Quote:
Modern computer controlled cars have a bunch of sensors to feed operating and driving conditions to the ECU. They are responsible for reading temperature, humidity, altitude, fuel octane, engine speed, car speed, accelerator pedal position, break pedal position, etc. When you start for the first time the sensors tell the computer the engine is cold and the air is dense. The computer alters the ignition timing, VANOS, fuel charge, making it a bit richer to compensate for the dense air (ratio of 14:1). As the engine warms up the air intake is warmer as well, the air is less dense and all those changes are reversed. In your case there could be a number of problems:
These are just a few things to look for or mention to SA. They all affect the engine management system which with a computer controlled car is a big deal. Keep in mind the issues I mentioned above typically throw error codes when there’s a fault so when they say there’s no codes they automatically assume the computer is looking at each of these things and don’t bother looking themselves or running diagnostics. Don’t be surprised when they act like you’re ignorant and may even suggest that you leave it to professionals. Had they adequately diagnosed and repaired your car we wouldn’t be having this conversation, right! So, don’t let them bulldoze you. It is not normal for your car to run rough when cold – maybe in the 1940’s but not in 2010! Don't let them push you out of the place without a copy of the actual diagnostic sheet!
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Last edited by teagueAMX; 06-24-2010 at 09:25 PM.. |
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06-24-2010, 09:48 PM | #9 |
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Yup, no issue starting. Mine just stalls every time I stop at a light !! Seems there is a software fix for this that seems to break something else !!! typical BMW !!!
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06-24-2010, 10:35 PM | #10 | |
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I suppose we don't want them to apply the same software fix to Z4@Phuket car to solve the choking in the morning problem?
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Last edited by teagueAMX; 06-24-2010 at 10:42 PM.. |
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06-25-2010, 03:10 AM | #11 |
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Thanks for all comments I am waiting for BMW to give me the answer
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