- Hiccup In 335 at Idle? -

[HK_M3]

Hey all, I have a hiccup in the 335 at idle.....the car doesn't surge..but kind of mistep's...similiar to what my E36 M3 used to do. Anybody else experience this?

-Nate

[Terry @ BMS]

Hey all, I have a hiccup in the 335 at idle.....the car doesn't surge..but kind of mistep's...similiar to what my E36 M3 used to do. Anybody else experience this?

-Nate

Seems to be normal on the 335i. :(

[galahad05]

Effect of throttle-by-wire?

Or more specifically, the ECU using variable valve timing to perform throttle functions, perhaps...

[Terry @ BMS]

Effect of throttle-by-wire?

Or more specifically, the ECU using variable valve timing to perform throttle functions, perhaps...

I'm not sure what causes it but those are all potential items. Perhaps the DI system isn't as smooth at low RPM also.

[Danny 335i]

Mine idles smooth as glass.Bone stock 335i coupe, except with a JB1.(which i love!)

[Terry @ BMS]

Mine idles smooth as glass.Bone stock 335i coupe, except with a JB1.(which i love!)

:redspot

[Grumpa72]

Has the service tech seen the car yet? What does he say?

[RBrylawski]

Mine doesn't hiccup at idle. Actually, we have two that don't hiccup. You might want to take it in to your service center and let them take a look at it.

[leerambler]

mine does the same thing too, especially if you come to a stop after driving for a while. it seems like it is a very common problem, I've seen a bunch of other threads on it. my sa said it is normal, along with the annoying DI tick/tap

[azhrei]

Mine runs very smooth at idle (February 07 production date). I'm taking a 250 mile drive this evening, so I'll keep extra watch on it when I get to the end of the trip...

[neapolitan]

How new is it? My 328 used to have a pretty high idle, and not as smooth as I would have expected for the first 500 miles or so. Now, it is is smooth as ice cream on a warm day.


Mmmm.... ice cream...

[leerambler]

no, it's smooth other than just an occasional blip, kind of like if the a/c compressor kicked in - but it isn't that. it only does it occasionally, and it seems to be consistant with when it has been run for a while

[galahad05]

Direct Injection is (in)famous for causing a rough idle. This is why most (all?) manufacturers use a combination of direct injection and multi-port injection. The mpfi helps smooth the idle.

[azhrei]

I arrived in Jacksonville an hour or so ago. I let the car idle for about a minute before going into the hotel to check-in; no rough idle. I left it running while I was inside (but where I could keep an eye on it!). When I came out, about 3-4 minutes later, the idle was still very smooth. I took it to a convenience store to get some groceries and shut it off. It was still fine when I came back out 5-6 minutes later.

So my summary is, "no problems." Your mileage may vary.

[Beer Goggles]

I think the "rough" is when cold started. Mine seems to make lots of noises that go away when it warms up. Honestly I expect high strung/output engines to not idle well. How much time is spent there?

[leerambler]

agreed. it's certainly not bad either, I wouldn't say a rough idle. it just sort of blips down and right back up, almost like it forgot to keep running... usually only does it once too - like I said, similar to an a/c compressor kicking in. not a big deal at all. if it kept doing it up and down, I'd be mad, but once every couple of days is not a big deal

[raceyBMW]

I think the "rough" is when cold started. Mine seems to make lots of noises that go away when it warms up. Honestly I expect high strung/output engines to not idle well. How much time is spent there?


This is probably the same reason the manual says specifically to not let the car warm up at idle, but to drive it right away.

[Arustik1]

This is probably the same reason the manual says specifically to not let the car warm up at idle, but to drive it right away.

We shouldn't warm the car up after starting it up?? :eek:

[raceyBMW]

The manual specifically says:

"Do not allow the engine to warm up by leaving it
running while the vehicle remains stationary.
Instead, begin to drive at a moderate engine
speed."

If you don't believe me, go here, page 44
http://www.e90post.net/e92coupemanual1.pdf

[custeichen]

Mine does it to. It does it while still warming up after driving and coming to a stop. After 10 or so sec it does a single hiccup. Service tech said he couldn't feel it but I think it was warm when he drove it.

[mryakan]

The manual specifically says:

"Do not allow the engine to warm up by leaving it
running while the vehicle remains stationary.
Instead, begin to drive at a moderate engine
speed."

If you don't believe me, go here, page 44
http://www.e90post.net/e92coupemanual1.pdf
Doesn't do any harm to warm it up but doesn't do any good either, it just takes for ever to warm up at idle and creates more useless pollution. If you drive at low/moderate RPM for few minutes, it warms up quicker and safely. In fact at idle, you just warm up the engine, the rest of the powertrain is still cold so you may start driving it hard thinking the engine is warm, but you'd probably be doing the tranny no good. The only time I let it warm in idle is when I need the frozen moisture to defrost on the inside of the windows. It is the worst thing in the winter, I sometimes even get fedup and scrape the windshield on the inside :mad, not looking forward to winter weather *sigh*.

[Beer Goggles]

The drive now is emissions BS, not really what you should do. I drove a new Subaru and you couldn't put it in "high output" until the engine was at operating temp...made me wonder why more cars don't do this.

[raceyBMW]

Or like the M3, which has warning on the Tach that told you when it was sufficiently warm to rev it high. So the driving right away is an emissions thing only, and has nothing to do with the direct injection?