OK, a friend run a scanner because the check engine light came on. and come up with.

Major lead in intake, (so I'm replacing the Crankcase vent valve)
Oxygen sensors (I'll do that next)
And if I remember correct Cylinder 1, 3 and another one is mis-fire. He said probably need a tune up.

I never owned a bmw, so what is the tune up consist of? Change plugs, oil (done that) what else? He said probably nothing major, but when I hear cylinder is misfiring, i'm thinking big trouble.

Also where can I get a repair manual to buy for my car 01 330Ci, can it pick one up at auto zone, or pep boys? etc...?

thanks for the help guys

Bentley Manual I think you have to order from online, at least that is were my dad got mine......

Id start with checking your plugs, see if anything is wrong there. Ive never had this problem but somepeople know more than me

Replacing the CVV for a major intake leak is a major leap of faith, unless the CVV has been diagnosed as bad. (Not that it won't cause your problem) A major intake leak is more likely to be in the intake boots. And a lot easier to check if you haven't done the diag already.

I'll change that out first, NGK over bosch right? lol

Intake boot meaning? btw the upper intake and what ever it connects to below? that gasket there?

Replacing the CVV for a major intake leak is a major leap of faith, unless the CVV has been diagnosed as bad. (Not that it won't cause your problem) A major intake leak is more likely to be in the intake boots. And a lot easier to check if you haven't done the diag already.

How to do I check for a bad intake boots?
Yes the CVV did diagnose bad, so thats why I change that.

Intake boot = the rubber boot between the throttle and the intake manifold. Remove it and check for cracks. You cannot effectively check it while it's on the vehicle.

Intake boot = the rubber boot between the throttle and the intake manifold. Remove it and check for cracks. You cannot effectively check it while it's on the vehicle.

Ok,
Thanks man I'll let u know how it goes

More info on intake boots:
http://forums.bimmerforums.com/forum/showthread.php?t=693261


You can easily test the crankcase vent valve as follows:
With the car idling, carefully remove the oil filler cap.
If the crankcase vent valve is good, you'll get a minor suction but no other change.
If it's bad, there will be a lot of suction on the filler cap, and the engine will stumble as it is removed. (Thats what I've read, anyway).

More info on intake boots:
http://forums.bimmerforums.com/forum/showthread.php?t=693261


You can easily test the crankcase vent valve as follows:
With the car idling, carefully remove the oil filler cap.
If the crankcase vent valve is good, you'll get a minor suction but no other change.
If it's bad, there will be a lot of suction on the filler cap, and the engine will stumble as it is removed. (Thats what I've read, anyway).


Yes, when I open the oil cap, it stumble alittle.

Unless you have well over 100K miles on the plugs, they are probably not the problem. Could be one or more ignitions coils going bad, very common 2001-2003 with BREMI coils (Bosch coils are OK). This is often the source of a misfire. You can test by moving the coils around to different cylinders and see if the misfire moves as well.

car has 93K on it,
So if I can change the coil around and see if the misfire is following the coil if its not, then its not the coil and if it is, its the coil. OK, I got that will try that see how it goes, but I just got the car and dont' know if the plugs was change or not, should I change it or just leave it if its working fine?

What brand of coils sould I get? or get it from stealership?

I would first clear up the intake leak before doing any further diagnosis. It may also clear up the O2 sensor error.

Plugs are probably the original. They really do last the recommended 100K mile replacement interval. You can change them if you like to eliminate as a possible cause, but probably not necessary at this time. Recommend sticking with the OEM NGK BKR6EQUP. You can get them most places. Remember to use a torque wrench and apply a little high Temp antisieze to the threads.

As far as coils, there are not too many choices. I know the BOSCH versions are better but you may have trouble finding them. Dealer is always a source but will be more expensive. You couild also have oil damaged coil boots if you have a valve cover oil leak (common). The boots are the short connectors between the coil and the plug and are separate parts

With moving some parts around and a little trial and error you will probably find the problem. Also don't forget you will be due for pre-cat O2 sensors at 100K if the error clears with fixing the intake leak.

As far as service manuals goes, while not perfect, the ones from Bentley Publishers is as good as you can get. Cheapest is probably from Amazon, and,don't laugh, I purchased plugs and O2 sensors from them as well!

Also don't forget you will be due for pre-cat O2 sensors at 100K if the error clears with fixing the intake leak.

Yes, that came up also. But I want to get his fixed first and then change that alittle later, want to get the misfire problem first. Probably a month later, gotta save up some more $$$ for that.

The coil boots, if they are damage it will have oil on them I assume right?

Any idea off hang how much a bosch coil will cost and also the coil boot?

Yes, that came up also. But I want to get his fixed first and then change that alittle later, want to get the misfire problem first. Probably a month later, gotta save up some more $$$ for that.

The coil boots, if they are damage it will have oil on them I assume right?

Any idea off hang how much a bosch coil will cost and also the coil boot?

Not sure what a damage boot looks like (I've never seen one). Just some oil alone will not do it unless it has soaked for a long time. Coils are about $80 boots about $15. Depends on where you get em.

BUT if there is oil, you will need to change the valve cover gasket(s).

Not sure what a damage boot looks like (I've never seen one). Just some oil alone will not do it unless it has soaked for a long time. Coils are about $80 boots about $15. Depends on where you get em.

BUT if there is oil, you will need to change the valve cover gasket(s).


Thanks man, I'll should be able to do all that work up figure things out this weekend. Again, thanks for the help, i'll keep ya posted.

didnt read all the post. Check the plugs, then the iginition coils thats usally why cars missifire.

didnt read all the post. Check the plugs, then the iginition coils thats usally why cars missifire.

Thanks for all the info, keep em coming I'll check it this saturday, the more info I got the better it will be :)

isn't this like the third thread you've made about your problem?

isn't this like the third thread you've made about your problem?

Go back to the other two and read the above questions that was asked.