M3 shakes violently after startup

[AdnanH35]

It's a very nice day in CT so I decided to take the M3 to work. Car drove fine on my 50 mile commute. At lunch, I decided to fill up at the local Shell gas station. On start up after getting gas, the car shook violently for a good 10 seconds then stopped. No CEL or anything. Drove back to work it was fine. Let the car sit for a bit in the lot at work and it started up normally. Never had it shake like that before. The ride home was fine. Should I be concerned about what happened? Is it normal?

[M5D]

coils/plugs and something loose in that area!

[AdnanH35]

Originally Posted by M5D

coils/plugs and something loose in that area!

Wouldn't the CEL come on if there's a misfire?

[M5D]

Originally Posted by AdnanH35

Wouldn't the CEL come on if there's a misfire?

Do you have bimmerlink? There should have been a CEL, but no telling why!

[AdnanH35]

Originally Posted by M5D

Do you have bimmerlink? There should have been a CEL, but no telling why!

I don't, I have the FIXD obd scanner. Will see if it pulled any codes

[FrozenGT]

We need more information how many miles are on your car what year is your vehicle have you drove your car hard recently has your car been tracked how's your car been drifted.

If you've driven your car hard lately most likely your car suffered from oil loss during the initial phase of start up it was not enough oil to lubricate the engine which caused vibration… I do know that the S55 engines have a oil pump and this is why it's so important to let the engine idle before you takeoff to lubricate the pistons. I remember reading that the club sport has two oil pumps to help oil properly lubricant the engine during hard driving.

[AdnanH35]

Originally Posted by FrozenGT

We need more information how many miles are on your car what year is your vehicle have you drove your car hard recently has your car been tracked how's your car been drifted.

If you've driven your car hard lately most likely your car suffered from oil loss during the initial phase of start up it was not enough oil to lubricate the engine which caused vibration… I do know that the S55 engines have a oil pump and this is why it's so important to let the engine idle before you takeoff to lubricate the pistons. I remember reading that the club sport has two oil pumps to help oil properly lubricant the engine during hard driving.

2017 F80 M3, 53k miles. Never tracked or drifted. Just got an oil change 1.5k miles ago. I drove it normal highway speeds and didn't do any hard pulls today. It was odd that it happened right after I got gas. In the morning it fired right up no issues and on the ride home as well. I just drove it to dinner and it seems fine

[Swift.ww]

Did anything happen before it started to shake violently (i.e., you downshifted, etc.)? Is it shaking violently at a stop or the whole ride home?

Initial thoughts is maybe a misfire so plugs/coils or possibly the fuel system. Worse case is possibly a slip in the crank hub

[AdnanH35]

Originally Posted by Swift.ww

Did anything happen before it started to shake violently (i.e., you downshifted, etc.)? Is it shaking violently at a stop or the whole ride home?

Initial thoughts is maybe a misfire so plugs/coils or possibly the fuel system. Worse case is possibly a slip in the crank hub

No, I literally filled up gas. Then I fired up the car to leave the gas station and on idle it started to shake. I drove 50 miles home later on in the day and the car ran normally

[FrozenGT]

Now I'm starting to wonder if the gas that you put in was bad meaning that there was water or condensation buildup in the tank or the gas had water somehow mixed in.

[AdnanH35]

Originally Posted by FrozenGT

Now I'm starting to wonder if the gas that you put in was bad meaning that there was water or condensation buildup in the tank or the gas had water somehow mixed in.

It was an older shell gas station now that I think about it. Luckily I had about a third of a tank before I refilled. It felt like it was going to blow up how much it started to shake then it stopped lol

Contaminated gas for $4.40 a gallon

[FrozenGT]

Originally Posted by AdnanH35

It was an older shell gas station now that I think about it. Luckily I had about a third of a tank before I refilled. It felt like it was going to blow up how much it started to shake then it stopped lol

Contaminated gas for $4.40 a gallon

Absolutely I guarantee you that gas was contaminated and it may not even be in the correct Octane rating. a good way to protect yourself is to carry a octane booster. if you're going to be purchasing gas at an old gas station. And just to be on the safe side I would use BMWs feel injector cleaner to help with contamination.

[Suds]

Water sinks to the bottom of the car gas tank where the gas pick up is.

Also, never fill your gas tank when the gas truck is filling the station tanks.

Originally Posted by AdnanH35

It was an older shell gas station now that I think about it. Luckily I had about a third of a tank before I refilled. It felt like it was going to blow up how much it started to shake then it stopped lol

Contaminated gas for $4.40 a gallon

[M5D]

Put some injector cleaner while you are at it for good measure!

[Gurucollector]

Had a similar issues a few months back. I didn't get any codes until I removed my BM3 tune and flashed the stock map ( I didn't relock the ECU ).

Turned out to be a leaking injector that had damaged one of my coils. Replaced 2 coils and I was good to go.

[AdnanH35]

Originally Posted by Gurucollector

Had a similar issues a few months back. I didn't get any codes until I removed my BM3 tune and flashed the stock map ( I didn't relock the ECU ).

Turned out to be a leaking injector that had damaged one of my coils. Replaced 2 coils and I was good to go.

I'm flashed on BM3 CS map. I was actually wondering if the car would throw lights since it's flashed. So since I'm tuned my car won't throw CEL codes???

[Ropes]

The gas would not have caused it on initial start up. If it was bad gas then the issue would start after the old "good" gas that were in the lines had been used. So this would talk about a minute to happen and would be a consistent thing. How many miles on your spark plugs and what is the gap? If tuened you need to replace them sooner.