e90 325i cold start

[achtung]

hey guys,havin this annoyin prob lately.. on a cold start the engine seems to misfire ( dunno if its the correct term) and rpm fluctuates erratically for 4-5 seconds, then everything goes back to normal. on subsequent starts she fires up real sweet. anyone with same experience or heard of this problem??? took it to quill and ran diagnostics... everything seems fine. anyway they updated the software which took 3 hours and the only good thing i got out of this is latest maps and a slightly different presentation of some info displayed in the i drive . BUT THE PROBLEM PERSISTS!!!! Goin again tom... damn.. so much for JOY IS EFFICIENT AND DYNAMIC :sleep:

 

[viewfinder]

Sounds like vacuum leak symptom somewhere in the intake. Or maybe a worn out fuse that when cold it's causing intermittent open circuit. I experienced the later before with the E34 fuel pump fuse.

 

[glock_8]

try push the engine a lil bit...frequent stop-go short distant drive or slow drive can cause this too...

btw, what nav map version currently being offerred? and its FOC?

 

[David Yong]

I experienced this before in my previous e90 325i and they found out the problem is with the Exhaust Valve Vanos Adjustment unit. Once that is changed, the problem goes off.

Before that they also changed the Starter unit for me. Prior to changing anything from them, they just clean the air filter for me and obviously that does not solve the problem, so they changed both the Starter and Exhaust Valve Vanos Adjustment unit. Try to go on this when you speaks with the SA.

 

[E46Fanatic]

try push the engine a lil bit...frequent stop-go short distant drive or slow drive can cause this too...

btw, what nav map version currently being offerred? and its FOC?

THis is my finding as well. Tekan the car a bit and the next cold start is smoother for some reason. When u're stuck in jams etc, the next morning cold start is not as smooth. :stupid:

 

[astroboy]

Try replacing the spark plugs. There was one similar case before and fail to be detected by the SC.

 

[rastamarley]

fuel

during cold start its happen becoz the engine is cooled down n the fuel is not delivered to the engine injectors if its happen all the time the problem might be the high pressure pump , if there is no fault code on DME the problem might be normal .....

cheerz

 

[achtung]

anyway.. my car is stayin the night at the service center. the mecs wanna simulate the start in the morning. Guess thats the best way. will find out tom if there is any prob which i think there is coz never had the problem until few days ago. always tekan the car ma.. my av speed still in the mid 50's and sure every few days tekan until rpm past 3-4k .. thanks for the feedbacks. cheers mates:top:

 

[Cobra Kai]

btw, what nav map version currently being offerred? and its FOC?

There won't actually be a new map version. The software update will add new software features based on the same map data. The map itself will never be provided FOC. From this year onwards it's also very difficult to copy - all the cars now have the maps loaded onto a hard drive rather than DVD. A few people have tried to copy the data via the USB port, but I do not know of any success to date.

 

[racheltoh]

is it also due to ur habit? for me, every time i start the car (press the key), i dont push in the key n start the car immediately. at least there is a 1 min interval. then after i start the car, i let it warm up min 3-5 minutes irregardless morning noon or night.. n i switch on the aircon after 5-10 mins. so far, i dont face any "rpm fluctuates erratically"

 

[achtung]

is it also due to ur habit? for me, every time i start the car (press the key), i dont push in the key n start the car immediately. at least there is a 1 min interval. then after i start the car, i let it warm up min 3-5 minutes irregardless morning noon or night.. n i switch on the aircon after 5-10 mins. so far, i dont face any "rpm fluctuates erratically"

if u see ur onwer's manual pg 54, on starting the engine, it says and i quote " do not warm up the car engine at a standstill, it is preferable to set off, driving at moderate engine speeds"

U have been warned now.. hehe :wink: personally i think it's just a waste of fuel.

on regards to my prob, quill was instructed by bmw malaysia to do an oil change first. they reckoned something to do with the viscosity of the oil :stupid which i didn't think i was) . after doin that, rpm was still erratic on the first start. now they looking at the possibility of changing the fuel pump !!!

see what happens next... car still stuck there :stickyman:

 

[astroboy]

Spark plugs!!!

 

[racheltoh]

hehehehhe now u know lor..i never read the manual!

however this practice is not common? i've done this with all my cars le.

 

[astroboy]

hehehehhe now u know lor..i never read the manual!

however this practice is not common? i've done this with all my cars le.

Driving slowly to warm up machinery achieve 2 purposes:

1. Stationary with engine running is wasting Earth resouces. Wasteful!

2. Moving the vehicle allow not only the engine, but the drive terrain components to warm up as well which include the transmission and rear diff box.

 

[Traveler]

hehehehhe now u know lor..i never read the manual!

however this practice is not common? i've done this with all my cars le.

For my E36, VW Passat and my E90, I start and immediately drive off. Only for my old 1983 Honda Accord that I started, let the car warm-up for a few mins, before driving. The Accord's engine would have sputtered and died if I tried to drive off immediately (for cold starts only; hot starts no problem).

 

[Vroom325]

Hi Traveler, sorry for different issue, what year is your VW passat? My friend got an offer for a used passat. He is quite tempted to buy but worry about workshop & spare part price? would like to seek your advise, pls check your pm, thanks!

 

[Schwepps]

Rachel, warming up under idling is not a recommended practice for any modern car. Basically, the oil pump is not pumping much at idling speed, so the engine won't be getting lubrication in the vital top-end. Bad for the engine.

 

[racheltoh]

why nobody tell me earlier..................

 

[Schwepps]

Don't worry dear, it won't hurt your engine THAT much. The practice of starting and idling to warm up was for the old generation of cars, but the technologies (eg. oil pumps) have changed since. It's also not a good idea to start up, and then sit in your car checking your phone or blackberry while your car 'warms up'. Makes you a carjack prospect - an idling car is a dead duck. Start up and drive off immediately. :wink:

 

[racheltoh]

applies to Japanese cars too?