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11-21-2017, 07:03 PM | #1 |
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Parked overnight, rough cold start in morning
So now this problem is consistent every morning; 2012 128i parked in garage, car cranks then stalls. It is repeated about three times and then it becomes a rough idle, but within 15 seconds engine runs smooth. From then on throughout the day, starts without a problem, but when sitting overnight, it becomes a rough start the next day.
This feels like a "choke" problem, although I don't think this has a choke, but probably an injector that pumps additional fuel at a cold start. It also could be that the fuel line is not holding the pressure in the line, whether the fuel pump has a check valve to maintain pressure when engine is shut down. Has anyone experienced this problem or have any suggestions. |
11-21-2017, 07:25 PM | #3 |
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AFAIK, there hasn't been a separate cold start injection used in BMW engines since the M20/M30 Motronic systems. Fuel pressure is a possibility. Physically checking at the rail before starting cold would be my preferred first option. Checking for fault codes is certainly advisable as well, of course.
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11-21-2017, 08:09 PM | #4 |
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Pretty basic advice... hope you are using nothing but top tier gasoline. Anything less could be lacking the detergency needed to keep your fuel delivery system clean.
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11-22-2017, 12:57 PM | #6 | |
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Until then, any autozone/advance auto/pep boys will do a code scan for free. Take the codes down when then scan them, and go home and post them here and do some research on your own.
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11-22-2017, 02:33 PM | #7 |
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OBD2 scans are rarely helpful, and sometimes downright misleading. If you're going to buy a scanner, buy one that reads BMW-specific codes.
Fuel quality might be a factor, but it's likely secondary at most. If you've got an injector that's leaking when closed due to deposits you could put that down to fuel, but more often than not it's exacerbated by lack of flow due to light throttle application (admittedly this is not as common as it used to be). My solution to that is to dump a double strength dose of Techron into a quarter tank of fuel and drive ~50 miles hitting the redline with every shift. There will be no deposits remaining. Change the oil when you're done. |
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11-22-2017, 09:27 PM | #8 |
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Could be your battery...if it is old, it's probably more sensitive to temperatures than it was last time it was winter. The stalling issue is elusive to me, could be spark plugs, but fuel something or other seems most likely. Good luck!
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11-23-2017, 07:13 PM | #9 |
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I have a similar issue as well. 135i though. Cold starts when the revs get to about 800 after the initial start, it "chokes" and revs up to 1500 rpm. Only once it's warm it idles fine and such. No lack of power except if you try to drive off right away it, it almost stalls before the computer kicks in and revs it high to prevent stalling. I'm puzzled about this, as a leaky injector would cause performance issues all times and not just on cold starts alone.
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11-23-2017, 07:36 PM | #10 | |
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11-25-2017, 11:30 AM | #11 | |
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11-25-2017, 02:32 PM | #12 | |
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11-25-2017, 03:42 PM | #13 |
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Well soon it'll go in for an oil change at BMW, maybe they can have a look. It has to be fuel related according to my father. Since it chokes out when coming down to a idle. I might try cleaning the vanos solenoid with some card cleaner and see if that does the trick. I saw in some videos that it can get junked up and cause issues sometimes. But in all honesty, it could basically be anything.
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12-03-2017, 09:12 PM | #14 | |
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12-04-2017, 05:54 AM | #15 |
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It's just a precautionary measure, really. If indeed the rings are partially stuck (this is one of the things the Techron overdose can help with, though probably more common on older cars) you can get some oil dilution from the leakdown on the cylinder walls until the rings unstick and reseal. I doubt very much it's necessary, but I do it just to put my mind at ease.
Two bottles and drive the hell out of it. Get lots of fuel flowing through those injectors and lots of heat in the cylinders. |
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12-04-2017, 10:15 AM | #16 |
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I ran some Techron through mine, put it in, filled the tank with 93, and the car idles smoother and starts slightly easier now. You might also take a look at/replace your fuel filter, depending on your car’s mileage. American gas, I’ve heard, is crap. Works fine for me, though...
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12-04-2017, 01:37 PM | #17 |
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The car has 37,000 miles, so I wouldn't think it needs the fuel filter replaced, but you never know. If the strong dose of Techron doesn't do the trick, then I'm just going to bite the bullet and take it in mechanic.
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12-05-2017, 09:39 AM | #18 |
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I'm only @ 94,000km. I wouldn't think to replace the fuel filter since it's still a new vehicle. My car still has the rough idle and bad cold start. I'm at a lost with this thing and it's making me want to move to a CX-5 or something since the snow will begin to fall.
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12-06-2017, 09:17 PM | #19 |
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UPDATE: Still on my original Techron added tank full, down to 1/3 of a tank, and she's back to normal. Smooth start, smooth idle on the first crank. I'm still going to add the second bottle of Techron concentrate.
My theory is that some of the injectors leak overnight (due to carbon buildup), loosing fuel pressure in the supply line, which the fuel pump, at start, cannot keep up with. Does this make sense? |
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12-07-2017, 07:05 AM | #20 |
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12-10-2017, 02:23 PM | #22 |
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I dumped a bottle of tectron and gave her hell (on the highway going to 200kmph) and even added a tank of 93 octane not long after. Still have cold start issues and such. Thinking come spring time, I'll replace my index 12 fuel injectors with the new index 13 ones.
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