Help! BMW 330 ZHP randomly stalls out.

[Linh]

Everyone,

I've had the car for almost a month now and had the ZHP randomly stall out on me about 3-4 times now. It always happens in 1st gear driving around parking lots and once at a gas station in neutral. Just after filling it up, I cranked the car and gave it a slight rev in rpms and the car suddenly stalls out. The car would crank fine every time afterward when it happens though.

The other times (parking lots) is when I would engage 1st gear, it would stall when I give it a little throttle. I'm really curious as what would cause this to happen? Could it be a ICV? DISA? torn intake boots? Or worst, a ECU problem?

[ZSP-Mafia]

No codes yet? This sounds exactly like what happened to my car, right before it threw a code for a bad camshaft position sensor.

[Linh]

Nope, no codes.

[Tampa330i]

Mine stalled at first too, maybe 3 times it happened. Always when accelerating from a stopped position. I have no idea what was causing it, but it stopped and hasn't done it again. I suspected it had something to do with sitting on a lot.

[kayger12]

Checking the disa, intake boot, and cleaning your icv are good places to start. Always cheaper to check and clean first.

If your CPS is crapping out, hopefully it throws a code for you before long.

Also, don't overlook your vanos. My 325 had the same issue- it would sometimes bog down and come close to stalling when I would give it just a little gas (and would stall out in similar circumstances with the A/C on). Diagnosed as vanos and never happened again after the vanos rebuild.

[danewilson77]

+1 on the icv cleaning. Better just buy an upper and lower intake boot too, and inspect the disa as mentioned by the man.

http://www.bimmerfest.com/forums/sho...d.php?t=248979

Give us a brief maintenance history pls....

[Linh]

50k Unknown
45k 2nd Oil service
31k Electronic fuel pump in fuel tank permanent failure
30k Oil level/ oil condition sensor permanent failure
29k Inspection 1
14k Wiper switch loose
14k Ignition coils fail (Bremi) Recalled
13k 1st Engine oil change
5k Recode light switch center on

Thats all I know about the car's history maintenance wise.

Besides the Vanos hesitation/lag around 2.5-3k rpms, it runs good and smooth.

I should probably also add that there has been 2-3 times when the car would not start on the first try. Usually in the morning before going to work.

[danewilson77]

What have you done...?

Maintenance wise?

[Linh]

Since I had it, I've changed:

Rear Rotor/pad/sensors
Rear diff fluid Mobile 1
Redline MTL
Brake DOT4 fluid
Oil 0w40 Mobile 1
Cabin air filter

The air filter still looked clean, so I didn't replace it yet.

[danewilson77]

I am assuming the intake filter got cleaned during second oil service. Lets hope so.

Anyways.....I recommend doing the following. Should cost around 30 bux, and will take 1.5 hours (max)


Parts/materials neeeded:

1. Intake filter (you can skip if you think it is prudent).
2. Upper and lower intake boot.
3. Carb cleaner.
4. MAF sensor cleaner.

1. Remove intake.
2. Remove upper and lower intake boots. You will probably have to cut the lower one off due to orientation of hose clamp.
3. Inspect DISA by unplugging and removing two torx. Check to ensure gasket is in good condition, and check spring feature of flapper valve. When you pull it out...it should be in mid position. When re-installing, place a super thin coat on non-hardening permatex to the gasket.
4. Make you way down to and remove the ICV. Once you have pulled it.....hold it in your hand and act like your revving a motorcycle. There should be freedom of rotation within the tapered vlave itself. You should hear it click, click, click.
5. Liberally spray carb cleaner into it, to remove all muck and mung.
6. Clean MAF sensor with cleaner. Follow directions.
7. Reassemble.

This will eliminate alot of things.

Make sure to take your time and dhu eeeeeeeeet right.