Anyone ever have this problem?
- Thread starter mybabyM3
- Start date
Automatic or Manual? It's normal and I'm not sure how it can be THAT annoying (unless something is wrong with your car). It's the engine stabilizing the idle... shouldn't rev much higher than 1k rpm to stabilize. If that annoys you, you might want to look for a hybrid or something (all engines do it)
Hey, my car does the EXACT same thing, but mine is a manual. It only happens when in motion and slowing down in neutral for whatever reason. The RPMs in mine drop to like 400 raise to about 800 and does this until I come to a complete stop. And for mine it only does this when the headlights are on. What we are expirencing isn't normal. I actually solved this problem though. This past weekend I installed a TMS chip. The idle surge improved about 75%. The next day I installed a new O2 sensor and the problem is completely gone. Car is running like a champ.
same thing here, and i don´t think that it stabilizes the idle. that infact should be done in a second w/o lots of revhopping. it annoys me too and i have no clue. well, though it does not annoy me enough to take the car to a dealer (or ist it the fear of costs?) ![[hihi]](/images/smilies/icon_smile_hihi.gif "Hi Hi [hihi]")
one more thing i think i found out is, that this more or less only whens while the engine is still cold or not yet at operating temperature.
one more thing i think i found out is, that this more or less only whens while the engine is still cold or not yet at operating temperature.
93 325i mentioned replacing the o2 sensor. I did this before the symptoms started. My gas milage was way down and it was producing horrible smelling exhaust. After the o2 change both were corrected and now it is doing this idle hop. I also changed out the fuel level sender and gasket at the same time. I had the smell of gas with a full tank of gas and it was also leaking on the ground. For anyone with these symptoms it is an extremely easy fix. As many things as I have changed over the last month I can't believe my car is taking a step backwards with this idle problem. I am planning on changing the fuel filter and plugs in the next week or so if I can just get some nice weather again.
I have a '92 3251, and I had a conforti chip installed. Once in a while when coming to a stop, the RPM's will drop a couple of hundred, then the car seems to "catch"itself and it comes back. Driveability, gas mileage, and overall performance is top notch. The technician said something about an "offset" in the cams, and if it became a problem, he could align my cams...hmmmm sounds like a make work ($$$$$$$) project to me..does anyone have any thoughts?
hmmm, my problem is still there a little bit. It does it when cold usually...I changed plugs, fuel filter, fuel pump and the problem still persisted..I did recently add a bottle of chevron techron to the gas and that definitely helped the engine run smoother..Alternator may not be too far fetched because my problem arises when my headlights are on...My battery may not be the best either. Havent replaced it since I bought it used and on cold mornings it drags a bit
I don't think my alternator or battery is bad. Lights are bright and car starts quickly even on the coldest mornings. I do sometimes have the transmission light come on and then the dreaded limp mode where it is stuck in 3rd and 4th. Most information I have found say's to clean the battery connections. Mine look like the battery was just installed and no corrosion at all. By the way does anyone have a clue where the transmission control module is. This is suppose to be the reason for the problem when the battery connections are good. If changing the plugs and fuel filter don't fix this I am going to have to break down and put it in the shop. This problem is definately not normal. It did start after putting on the O2 sensor but all the other issues are gone now. This leads me to believe that is working properly. One last thought does anyone know the procedure to get the check engine codes from the OBC?
I had the same problem. It was the front brakes. I replaced the front rotors and brake pads, and the rear pads too but the cause of the surging problem was in the front. The old brake pads were worn at an angle, from front to rear. I think the calipers are a little flimsier than the pistons and they allow the pads to cant. Then, the tiny amount of creep in the brakes caused the engine to surge.
yea as a matter of fact i do have experience with it i run an import and stereo shop and see it all the time people pull too much power to the subs and their alternators get weak and arent able to produce enough so it runs off the battery until it can catch up. i see it daily. an just about anything can make your rpms surge when they surge something is turning on for what ever reasonr like a fan or something... bmws have thermostat and water pump problems is your car ever running hotter than it has before then a fan would turn on... do some research if you haent chnged the water pump or thermostat.they always go on bmw cuz their oem parts are crap. waterpump is made out of plastic comeon! plastic! so keep an eye on your temp if it flucuates its probably your thermostat sticking and you should be carful of this sht because that opens up a world of horrible problems
My car's temp is running right where it should. It was running cold due to the thermostat being stuck open. I changed it also the plastic housing and flushed the motor. Then put in BMW antifreeze along with Distilled water and a bottle of Redline water wetter. That was nearly a month ago and this problem just started last week.
m5runner, When changing engine coolant you are to use BMW coolant and Di-ionized water or distilled water but not tap water. This is pure H2O with out all the additives or correct ph to get the job done. I am starting to think my surging may be my brakes. I have had them on for a couple of months now. I didn't bleed them when I replaced the rotors and pads. My car is pulling a little to the left ever since the change. Why I say the brakes when I start off on the car and come to my first stop it doesn't do the surging but by the time I hit another stop and the brakes are making some heat it starts. I don't know how to confirm for sure.