Still Suffering from hesitation/bucking even after VANOS seals? Look Inside!

If you locate the vanos (end of the engine block, offset to the left), there is one solenoid clip in the upper right corner, and one in the lower left. The lower left is a @#$%%^ to get to without removing things. And mine is stuck. I have to say though, hitting every other connector under the hood, really seems to have helped. The hesitation and bucking is all but gone as well as the occaisional RPM revving between lower gear shifts. Also, my idle would "bounce" between 600 and 1000 rpms at a stand still. It is now perfectly steady at 600.

Only complaint now is I still feel like there should be more torque/acceleration, for a BMW 6 cyl. I say that, but I don't have any other BMW experience to compare it to, but it seems to lack the pop that it should have. I'm nit picking here though, the ride is smooth for the most part.

I did this a couple days ago. Didn't cure a damn thing when it comes to my acceleration surge/bucking issue. I'm replacing the fuel pump also to see if it cures it.

Originally Posted by E46Mango

I did this a couple days ago. Didn't cure a damn thing when it comes to my acceleration surge/bucking issue. I'm replacing the fuel pump also to see if it cures it.

I must stress that you have to do this to EVERY single connector for it to make a comulative difference.

For example,

I had done it to every single connector minus the ICV connector because I was just lazy to take the DISA out.

I went over that connector on the ICV today and it totally changed the way the car felt. Much smoother now and my MPG magically went up as well.

NICE! i'm becoming a fan of newe46fan! first, the ecu tune now this?!
i'm gonna have to look at these later. i love you man! no ****!

What do you mean every single connection

Sent from my PC36100 using Bimmer

Originally Posted by bwallace530

What do you mean every single connection

Sent from my PC36100 using Bimmer

Every single sensor plug.

I don't remember but does anyone know if the connectors for the fuel injectors have the same internal design as the others?



Or if it's similar to the TB connector.

Originally Posted by newe46fan

Every single sensor plug.

I don't remember but does anyone know if the connectors for the fuel injectors have the same internal design as the others?



Or if it's similar to the TB connector.

How long does it take to clean and get to them all?

Sent from my PC36100 using Bimmer

Sounds like those symptoms and your car is certainly old enough.

Originally Posted by Courtdale

If you locate the vanos (end of the engine block, offset to the left), there is one solenoid clip in the upper right corner, and one in the lower left. The lower left is a @#$%%^ to get to without removing things. And mine is stuck. I have to say though, hitting every other connector under the hood, really seems to have helped. The hesitation and bucking is all but gone as well as the occaisional RPM revving between lower gear shifts. Also, my idle would "bounce" between 600 and 1000 rpms at a stand still. It is now perfectly steady at 600.

Only complaint now is I still feel like there should be more torque/acceleration, for a BMW 6 cyl. I say that, but I don't have any other BMW experience to compare it to, but it seems to lack the pop that it should have. I'm nit picking here though, the ride is smooth for the most part.

What does that mean?

Originally Posted by newe46fan

I must stress that you have to do this to EVERY single connector for it to make a comulative difference.

For example,

I had done it to every single connector minus the ICV connector because I was just lazy to take the DISA out.

I went over that connector on the ICV today and it totally changed the way the car felt. Much smoother now and my MPG magically went up as well.

I agree with this 1000%. I was plagued with codes for years and was throwing parts at this until I saw a thread on squeezing the connectors to make them tighter. Since I did this 2 months ago I have had 0 codes. It almost makes it boring not wanting to fix the car on weekends.

http://www.beisansystems.com/

You can use search engines to find out things.

Originally Posted by Courtdale

What does that mean?

i suffered from the exact same symptoms. did this DIY and it didn't help
i changed the plugs which had 98k miles on them and it solved these symptoms.

*not saying this doesn't work, just suggesting to people who have tried this and it didn't help.

I'm about to do this for all the connectors in my M3 once I get the special tool to remove the intake box and I'll report back.

UPDATE:

Took the intake off and cleaned the ITB's as well as cleaned and re crimped all connectors



I was experiencing some throttle lag, after the connector clean and crimp the lag is gone. So it's official crimping the connectors nets the same effect as on the non-m's.

The connectors I re-crimped as per the procedure were the:

-Coolant temp sensor
-Oil temp sensor
-ICV
-EDK
-Alternator
-Other oil pressure switch
-MAF
-Lower hose coolant temp sensor
-All the misc on top of the intake manifold and next to the brake booster
-Crank sensor

Bro...you have an M now?

When did that happen??

Yea, for about a week.

Still have the 330ci for sale.

Damn...bold move, George!
Can't wait to see what you do with it

Hey guys, in addition to cleaning the contacts, did anyone re-grease the seals of the connector (not the contacts) with white grease?!

Have you had a problem taking them apart after years?

Dirt collector.

Originally Posted by jaymemaurice

Hey guys, in addition to cleaning the contacts, did anyone re-grease the seals of the connector (not the contacts) with white grease?!

Originally Posted by new//M3fan

Every single sensor plug.

I don't remember but does anyone know if the connectors for the fuel injectors have the same internal design as the others?



Or if it's similar to the TB connector.

UPDATE:

I took out the injector harness on my M3 and noticed they too could benefit from this procedure. So if M3 harness connectors share the same non-m connectors then it would also help!