Cold Morning engine rattle—>

Bill97Z

Registered

2005 330i ZHP (SOLD!) / 2006 X3 (SOLD!) / 2007 328xi (SOLD!) / 2011 328xi (SOLD!) / 2013 328xi

The HACK

Rest in peace, Coach

The engine is running TOO rich.

For some reason, there’s some residual fuel left in the cylinder or the fuel injectors, and when it first started in the morning the ECU adjusts for the cold temperature and cold start by adjusting the fuel mixture to RICH, but since there’s some residual fuel in the cylinder or injector it’s causing the engine to sort of choke on an excess of fuel.

At least that’s what I think is happening. There might be a small leak in the injectors. If it’s doing this on a regular basis, take it to your trusted dealership and have tell them the symptoms, and have them fix whatever is causing it.

Happened to me once when I accidentally pressed the gas pedal before starting the car, the car COUGHED and sputtered for a few seconds, but the sputter went away as soon as I put the car in gear and drove off.

Bill97Z

Registered

Thx for the info. It doesnt really sputter, just a rattle sound like a belt is loose or something, and then it goes away. hmmm. I will prob bring it in to the dealership soon anyhow and give them one more chance to fix my idle problem before i call up BMW NA.

I have a 2001 manual, and when I come to a stop and push the clutch in, the rpms drop very fast and overshoot the rpm at normal idle, causeing hte car to sputter and almost stall until it gains its rpm’s back. annoying and no one can fix it.

2005 330i ZHP (SOLD!) / 2006 X3 (SOLD!) / 2007 328xi (SOLD!) / 2011 328xi (SOLD!) / 2013 328xi

Guest84

Banned

Bill97Z

Registered

2005 330i ZHP (SOLD!) / 2006 X3 (SOLD!) / 2007 328xi (SOLD!) / 2011 328xi (SOLD!) / 2013 328xi

Guest84

Banned

Artslinger

BMW + twisty road = fun

I mentioned that same exact problem on my last visit to the dealer, rattle noise on cold start-up and sound goes away after 30 seconds. My dealers fix. the infamous «we can not duplicate the problem». The funny thing is my service adviser said his car was doing the same thing and was curious about a cause for this noise.

I also notice that your from a cold climate, this problem does not show up until temps fall down near freezing.

Bill97Z

Registered

2005 330i ZHP (SOLD!) / 2006 X3 (SOLD!) / 2007 328xi (SOLD!) / 2011 328xi (SOLD!) / 2013 328xi

Guest84

Banned

I mentioned that same exact problem on my last visit to the dealer, rattle noise on cold start-up and sound goes away after 30 seconds. My dealers fix. the infamous «we can not duplicate the problem». The funny thing is my service adviser said his car was doing the same thing and was curious about a cause for this noise.

I also notice that your from a cold climate, this problem does not show up until temps fall down near freezing.

i have the same thing on 325ci. if u have the heat on. it’ll be even louder..

ChadS

Registered

Two words: Secondary Airpump

I have the same thing on my car and had my dealer look at it. They kept the car overnight and heard it, but could it pin it down to anything. They had a rep from BMWNA coming a few days later so they had me drop the car off the night before and he confirmed that it is just the airpump. The two loaner cars (’02 325i & ’01 330i) I had both did the same thing. There is nothing wrong with the car, it just does this in colder weather for about a minute when warming up.

Artslinger

BMW + twisty road = fun

Two words: Secondary Airpump

I have the same thing on my car and had my dealer look at it. They kept the car overnight and heard it, but could it pin it down to anything. They had a rep from BMWNA coming a few days later so they had me drop the car off the night before and he confirmed that it is just the airpump. The two loaner cars (’02 325i & ’01 330i) I had both did the same thing. There is nothing wrong with the car, it just does this in colder weather for about a minute when warming up.

I kind of thought it may be something like that. why the heck can’t the dealer just tell me the pump makes noise when cold. I can accept that better than «can’t duplicate the problem» line of bull.

ChadS

Registered

I kind of thought it may be something like that. why the heck can’t the dealer just tell me the pump makes noise when cold. I can accept that better than «can’t duplicate the problem» line of bull.

In this case though I really don’t think many of the dealers know what the noise is. I know mine didn’t until the BMWNA rep came for their routine visit and knew it instantly. I wish they would say though that «we can hear the noise, but we are not sure of the problem and will research with our factory reps». This would be a prefectly acceptable answer for me rather then saying «can’t duplicate the problem» which leads me to believe they are just dumb because in this case I can duplicate it every morning. :dunno:

I think this is what Conley on the E65 Roadfly board is going through. His dealer is telling him that we «can’t duplicate the problem» (probably because they don’t know how to fix it) so he decided to film on tape everything that goes wrong. That puts them in the situation where they can long use «can’t duplicate the problem». Pretty smart if you ask me. :thumbup:

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