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SERVICE ENGINE SOON light on, why? help, what's wrong?
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12-14-2010, 09:26 AM | #1 |
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SERVICE ENGINE SOON light on, why? help, what's wrong?
Today is around 20 degrees, very cold. 2006 300i auto, 38k miles now. I turned on the engine and it started slow, I guess it's the cold weather. After it warmed up for 1 min, the SERVICE ENGINE SOON light is on in yellow. The car also felt alittle jerky while rolling at 5m/h(automatic). When I put the car in reverse, the jerkyness was slightly more noticeable. This is the first time I have this problem.
I checked under the hood, I also noticed the Green labeled CAP, CHF1(powersteering?) fluid still has a slight leak since the last visit to the dealer(months ago). Does this have anything to do with it? What could have caused this? I m planning to make an appointment with the dealer soon. thanks Last edited by BM2006i; 12-14-2010 at 09:36 AM.. |
12-14-2010, 09:31 AM | #2 |
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I had the same thing happen to mine last year. It got cold and got a check engine light. I thought it was the fuel cap and didn't think of it much. The light went away after a day but then came back. I took it in and they had to service the VANOS.
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12-14-2010, 09:47 AM | #5 |
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VANOS
From Wikipedia, the free encyclopedia VANOS (abbr. from German variable Nockenwellensteuerung) is an automobile variable valve timing technology developed by BMW in close collaboration with Continental Teves. VANOS varies the timing of the valves by moving the position of the camshafts in relation to the drive gear. This movement varies from 6 degrees of advanced to 6 degrees of retarded camshaft timing. Contents [hide] 1 Single VANOS 2 Double VANOS 3 VANOS Performance 4 List of VANOS engines 5 See also [edit]Single VANOS VANOS is a combined hydraulic and mechanical camshaft control device managed by the car's DME engine management system. The VANOS system is based on a discrete adjustment mechanism that can modify the position of the intake camshaft versus the crankshaft. Double-VANOS adds continuous adjustability to the intake and exhaust camshafts. VANOS operates on the intake camshaft in accordance with engine speed and accelerator pedal position. At the lower end of the engine-speed scale, the intake valves are opened later, which improves idling quality and smoothness. At moderate engine speeds, the intake valves open much earlier, which boosts torque and permits exhaust gas re-circulation inside the combustion chambers, reducing fuel consumption and exhaust emissions. Finally, at high engine speeds, intake valve opening is once again delayed, so that full power can be developed. VANOS significantly enhances emission management, increases output and torque, and offers better idling quality and fuel economy. VANOS was first introduced in 1992 on the BMW M50 engine used in the 5 Series. [1] [edit]Double VANOS First double VANOS system appeared on S50B32 engine in 1996. Later, BMW added "double" VANOS to its M52tu series of inline 6-cylinder engines, which changed the mechanism from fixed position operation to continuously variable, and added the same functionality to the exhaust camshaft, on a number of its cars. Double-VANOS (double-variable camshaft control) significantly improves torque and emissions since valve timing on both the intake and exhaust camshafts is adjusted to the power required from the engine as a function of gas pedal position and engine speed. On all BMW engines that use single VANOS, except S50B30, the timing of the intake cam is only changed at two distinct rpm points, while on the double-VANOS system, the timing of the intake and exhaust cams is continuously variable through a range of ~40 crankshaft degrees for the intake, and 25 degrees for the exhaust. The advantage of double-VANOS is that the system controls the flow of hot exhaust gases into the intake manifold individually for all operating conditions. This is referred to as "internal" exhaust gas re-circulation, allowing very fine dosage of the amount of exhaust gas recycled. [edit]VANOS Performance Single and Double VANOS systems due to age and mileage are commonly seeing performance issues as well as complete failure of the BMW OEM Buna-N VANOS piston seals (which are often successfully repaired by the use of aftermarket Viton seals to replace the OEM Buna-N seals). Another common effect is a rattling sound coming from the upper valve train assembly. The original seal material was found to be inferior for the application and tends to break down within 75k - 100k miles. VANOS Seal & Rattle kits are available to address these shortcomings. VANOS repair does require special tools that can be rented or purchased from a variety of vendors. [edit]List of VANOS engines Name VANOS Type Infinite Adjustments Solenoids M50TU Single No 1 solenoid I/O M52 Single No 1 solenoid I/O M52TU Double Yes 2 solenoid pwm M54 Double Yes 2 solenoid pwm N52 Double Yes 2 solenoid pwm S50 Single Yes 1992-1994 not in u.s - 2 solenoid pwm S50 Double Yes 1995-1998 not in u.s - 4 solenoid pwm S52 Single No 1996-1998 u.s - 1 solenoid I/O S54 Double Yes - 4 solenoid pwm M62TU Single Yes - 2 solenoid pwm N62 Double Yes - 4 solenoid pwm S62 Double Yes - 8 solenoid pwm + 1 pwm solenoid pressure regulator S85 Double Yes - 4 solenoid pwm + 1 pwm pressure regulator N73 Double Yes - 4 solenoid pwm Note: The engines starting with an "N" also have valvetronic variable intake valve opening. |
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12-14-2010, 10:09 AM | #6 |
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"Service Engine Soon" is an indication that your car needs service. It isn't an emergency or a major engine failure. It can be something as simple as an emissions control device isn't working or something more serious. The only way to know for sure is to connect it to a diagnostic tool and decipher the code.
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12-14-2010, 10:26 AM | #7 | |
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SES lights are emissions related. Gas cap error, lean/rich mixtures, EVAP system leaks/pump failures, etc. Think about the term "Service Engine SOON." Don't you think if it was a major engine failure, your car would prompt you to get your car serviced ASAP, hence Check Engine Light? OP, you need have your car scanned and pull the code/s. Post them up here. Most likely you'll be throwing P codes for a SES light, but there are BMW specific codes that can be present. EDIT: If you're throwing P codes, type them in google as you see them. For example, P0442. P codes are universal across all US spec cars and googling will provide descriptions of the codes and common symptoms, diagnosis tests, and repairs. That will save you a bit of time, rather than waiting for us to answer. BTW, OP the power steering doesn't have to do with the SES light. Last edited by fdriller9; 12-14-2010 at 10:34 AM.. |
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12-14-2010, 10:28 AM | #8 | |
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12-14-2010, 10:34 AM | #9 |
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12-14-2010, 11:42 AM | #10 |
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hi, thanks for the comments. I have tried/checked the fuel, it is good, open/closed, added more gas, still the same.
What about the jerky/shaky movements when the car is in reverse(just rolling, no gas applied) or roll forward? It is more noticeable in reverse. Also when the car is in park, you could still hear/feel the engines shaky/jerky sound. I have already made an appointment for next week, now i'm just driving modestly and just will leave it parked when i get home. thanks |
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12-14-2010, 12:06 PM | #11 |
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Sounds like your car is misfring.....bad coil pack, injectors, spark plugs etc.
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12-14-2010, 12:11 PM | #12 |
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had the same thing happen to me recently on a 2006 330I
Turned out to be faulty ignition coil on cyl 6. No biggie, they're $40-45 online, and its pretty easy to replace them yourself. Replace the spark plugs too while you're at it. I replaced all 6. Refrain from driving the car long distance as the misfire (which is the sign of shaky engine) can potentially damage your catalytic coverter (very expensive repair). |
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12-14-2010, 12:59 PM | #13 |
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thanks alot. Could the outside freezing temp caused? today is the first day i got this SES light on, car's parked now and not moving until the apptment date. the dealer is about 12 miles from me, now it's just the wait, hopefully it's nothing serious. thanks alot.
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12-14-2010, 05:27 PM | #14 |
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The SES light is lit because your car is missing 30cc's of engine displacement and the ECU can't remap the fuel injection to account for the reduced 5cc's of displacement per cylinder. Too much fuel in the cylinders may cause the cat converters to burn up. I wouldn't drive it!
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01-02-2011, 01:19 AM | #15 | ||
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Could it cause engine failure? or damage one of those cyls (ring or pistons) with the misfire?
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01-02-2011, 01:49 AM | #16 | |
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01-02-2011, 08:29 AM | #17 | |
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If his engine is running fine now, he probably does not have misfire condition present. The BT scan tool is a good tool to have since it tells you whether the condition that caused the troble code is currently present, or happened in the past. The BT scan tool records the mileage at which the code appeared. |
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01-02-2011, 11:44 PM | #19 | |
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