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Old 11-03-2013, 07:22 PM   #201
always-there
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Re: Still Suffering from hesitation/bucking even after VANOS seals? Look Inside!



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Last edited by always-there; 11-03-2013 at 07:24 PM.
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Old 11-12-2013, 10:51 AM   #202
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I tried this and it did nothing
Still got the kangeroos when setting off, and crap tickover
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Old 11-12-2013, 11:04 AM   #203
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Originally Posted by new//M3fan View Post
Not everyone has rich friends that buy well maintained cars... you don't know it all you know. (neither do I) but aspiring you do doesn't bode well on you or others

If you still stand by your opinion

Show me proof these are standardized, and suffer from no use inflicted damage.


and I will promptly follow up with a refusal for cause, without dishonor.
Don't hold your breath.
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Old 11-24-2013, 08:21 PM   #204
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Picked up a 2004 ZHP in perfect cosmetic condition (122k miles), but it has the dreaded jerky acceleration between 2500 - 3000 RPM, and it's grumpy as hell when cold. So far I've done:

Sparks - went NGK. No difference in the way the car runs.

O2 Sensors - was throwing pre cat O2 codes, and with 122k they were due for replacement. Very slight improvement in the way the car runs.

Fuel pump - it died 200 miles from home a week after I bought the car, fortunately near an Autozone in Dallas. I searched the forum and did the job in the parking lot of a restaurant in 2 hours. Noticeable improvement in the way the car runs. Thanks guys.

Fuel regulator - bought one with the pump. Not sure it was bad, but that damned little vacuum hose was certainly toast. Replacing the regulator and the vacuum line did wonders for the car, but it's still bucking and it still runs like hell when cold.

DISA - rebuilt it as PM. The valve wasn't bad, but the O ring was flat, probably allowing un-metered air into the intake. No improvement in the way the car runs, but I do sleep better knowing the pin isn't going to ruin my engine. How can a car company that is so smart be so stupid sometimes?

MAF - cleaned it. No change.

In the mail - New coils from BavAuto. I'll keep the old ones as spares.

Next up - VANOS. Bought the seals and the rattle kit. I'll certainly pay attention to the electrical connections after this post. Going to upgrade the cooling system while I'm in there.

If I get this far and the car still bucks I'm going to be pissed. What else is there?
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Old 11-24-2013, 08:57 PM   #205
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Quote:
Originally Posted by DRD2 View Post
Picked up a 2004 ZHP in perfect cosmetic condition (122k miles), but it has the dreaded jerky acceleration between 2500 - 3000 RPM, and it's grumpy as hell when cold. So far I've done:

Sparks - went NGK. No difference in the way the car runs.

O2 Sensors - was throwing pre cat O2 codes, and with 122k they were due for replacement. Very slight improvement in the way the car runs.

Fuel pump - it died 200 miles from home a week after I bought the car, fortunately near an Autozone in Dallas. I searched the forum and did the job in the parking lot of a restaurant in 2 hours. Noticeable improvement in the way the car runs. Thanks guys.

Fuel regulator - bought one with the pump. Not sure it was bad, but that damned little vacuum hose was certainly toast. Replacing the regulator and the vacuum line did wonders for the car, but it's still bucking and it still runs like hell when cold.

DISA - rebuilt it as PM. The valve wasn't bad, but the O ring was flat, probably allowing un-metered air into the intake. No improvement in the way the car runs, but I do sleep better knowing the pin isn't going to ruin my engine. How can a car company that is so smart be so stupid sometimes?

MAF - cleaned it. No change.

In the mail - New coils from BavAuto. I'll keep the old ones as spares.

Next up - VANOS. Bought the seals and the rattle kit. I'll certainly pay attention to the electrical connections after this post. Going to upgrade the cooling system while I'm in there.

If I get this far and the car still bucks I'm going to be pissed. What else is there?
After seals and this nothing else. possibly ccv
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Old 11-26-2013, 07:55 AM   #206
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Just curious... did you buy the car from a dealer? Private? Where you aware of the probs? Any maintenance records? What did you pay?

Quote:
Originally Posted by DRD2 View Post
Picked up a 2004 ZHP in perfect cosmetic condition (122k miles), but it has the dreaded perky acceleration...
Oh, and what's a DISA? Pin??? Does my '03 325xi have this?
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Old 11-26-2013, 10:37 AM   #207
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Quote:
Originally Posted by CORVAIRWILD View Post
Just curious... did you buy the car from a dealer? Private? Where you aware of the probs? Any maintenance records? What did you pay?

Oh, and what's a DISA? Pin??? Does my '03 325xi have this?
Private party, $9350 and yes I was aware of the problems. The car looks like it came off of the show room floor, but the PO was not mechanically inclined and was tired of the mechanical foibles. I'm not afraid of ironing the wrinkles out of a good BMW (after all, they all have them) so I picked it up. It was the best looking ZHP in the Austin area. My goal is to go through the car and replace/rebuild most everything that could potentially be a problem. My budget is $1500.

At this point I'm pretty sure the VANOS is the issue, and I'm going to rebuild it the first chance I get. The interesting thing is that the poor cold weather performance is going away. Perhaps the DME had compensated for the vacuum leaks and it's learning that they're no longer there. The 2500 RPM bucking acceleration is still there.

The DISA valve sits on the side of the intake and effectively changes the length of the intake runners to give the car a performance boost. BMW calls it an Adjuster Unit. It's very poorly designed, and if it wears out it can drop a metal pin into your engine and ruin it. Here's a link that shows it on your car, it's part number 7:

http://www.realoem.com/bmw/showparts...79&hg=11&fg=40

German Auto Solutions makes a very well engineered upgrade kit. It's a 1 - 2 hour very easy DIY. Here's a link to the kit:

http://germanautosolutions.com/bmw_s...repair_kit.php
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Old 11-28-2013, 11:29 AM   #208
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Quote:
Originally Posted by DRD2 View Post
Picked up a 2004 ZHP in perfect cosmetic condition (122k miles), but it has the dreaded jerky acceleration between 2500 - 3000 RPM, and it's grumpy as hell when cold. So far I've done:

Sparks - went NGK. No difference in the way the car runs.

O2 Sensors - was throwing pre cat O2 codes, and with 122k they were due for replacement. Very slight improvement in the way the car runs.

Fuel pump - it died 200 miles from home a week after I bought the car, fortunately near an Autozone in Dallas. I searched the forum and did the job in the parking lot of a restaurant in 2 hours. Noticeable improvement in the way the car runs. Thanks guys.

Fuel regulator - bought one with the pump. Not sure it was bad, but that damned little vacuum hose was certainly toast. Replacing the regulator and the vacuum line did wonders for the car, but it's still bucking and it still runs like hell when cold.

DISA - rebuilt it as PM. The valve wasn't bad, but the O ring was flat, probably allowing un-metered air into the intake. No improvement in the way the car runs, but I do sleep better knowing the pin isn't going to ruin my engine. How can a car company that is so smart be so stupid sometimes?

MAF - cleaned it. No change.

In the mail - New coils from BavAuto. I'll keep the old ones as spares.

Next up - VANOS. Bought the seals and the rattle kit. I'll certainly pay attention to the electrical connections after this post. Going to upgrade the cooling system while I'm in there.

If I get this far and the car still bucks I'm going to be pissed. What else is there?
If the problem is between 2500 to 3000 rpm under acceleration in the higher gears you probably just need the software updated.

http://forum.e46fanatics.com/showthread.php?t=966614
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Old 11-28-2013, 11:37 AM   #209
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Still Suffering from hesitation/bucking even after VANOS seals? Look Inside!

I thought the consensus was that 2800 rpm hesitation was the Intake Cam position sensor?

Or did I miss the memo?



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Old 11-29-2013, 01:32 PM   #210
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mrmaico - If it's still there when I get the VANOS done the software's next on the list. The only reason I haven't done the software yet is because I can't update it myself. I hate, HATE, taking my car to the shop - even if it's the right thing to do

swordsman - I wouldn't call this a hesitation, it's more like an oscillation that happens between 2500 - 3000 RPM and will only quit by getting the car out from this RPM range.
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Old 12-04-2013, 02:26 PM   #211
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Re: Still Suffering from hesitation/bucking even after VANOS seals? Look Inside!

If the were to drop into the engine would it make a rataling noise

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Old 12-04-2013, 03:20 PM   #212
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All Better

Hi all, new to the group...

I want to think everyone for your advice on this. I had the same issue with low-end bucking. Took it to a local shop and they replaced the vanos solenoid sealing plate due to rubber rings failure. I thought all was good but the bucking came back. Mind you it was not as bad as before but there. I spent sometime doing a combination of tightening the connectors and using contact spray and as of today my baby is running like a woman possessed.

Thanks again all!!!
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Old 12-05-2013, 08:01 PM   #213
DRD2
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Crap - did the VANOS now the car runs rough and has no power. Wellllllll...guess I get to tear into it again and see what I did wrong :\
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Old 12-06-2013, 06:57 PM   #214
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Hallelujah

Finished the VANOS including the rattle kit and the bucking acceleration is all gone. Car runs like a champ. :thumb up: (Lack of power from last post was a loose ground wire for the sparks)

Last edited by DRD2; 12-06-2013 at 06:59 PM.
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Old 12-07-2013, 02:48 PM   #215
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Originally Posted by DRD2 View Post
Finished the VANOS including the rattle kit and the bucking acceleration is all gone. Car runs like a champ. :thumb up: (Lack of power from last post was a loose ground wire for the sparks)
Good to hear you got everything sorted and running good. I also did my Vanos before trying the software update but it didn't make any noticeable difference on mine. It may have been possible though that the PO had done the Vanos already judging by the condition of the valve cover gasket (nice and soft) and the Vanos seals.
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Old 12-07-2013, 03:02 PM   #216
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Originally Posted by mrmaico View Post
It may have been possible though that the PO had done the Vanos already judging by the condition of the valve cover gasket (nice and soft) and the Vanos seals.
Anything is possible. My VCG was nice and soft after eight years when I did my vanos seals.
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Old 12-16-2013, 08:35 AM   #217
DRD2
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Craaaaaaap

Quote:
Originally Posted by mrmaico View Post
Good to hear you got everything sorted and running good. I also did my Vanos before trying the software update but it didn't make any noticeable difference on mine. It may have been possible though that the PO had done the Vanos already judging by the condition of the valve cover gasket (nice and soft) and the Vanos seals.
It started doing it again on Thursday so I swung by the stealer to see how much they would charge to flash the DME. The guy couldn't figure out what I was asking them to do, so he walked back and talked to another guy and they looked at me and laughed - wtf. He came back and said, '$280, but that won't fix anything, that's just to reset the codes and flash the DME.'

So I called an indy shop and described the problem and what I've done to date. They said they didn't think a software update would fix it, that there are other things that are more likely to be the problem, but that they'd be happy to update it for $160.

Last edited by DRD2; 12-16-2013 at 08:37 AM. Reason: Spelling
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Old 12-16-2013, 09:40 AM   #218
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It started doing it again on Thursday so I swung by the stealer to see how much they would charge to flash the DME.
I lost track, did you systematically examine and tighten all the appropriate electrical connectors yet?
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Old 12-16-2013, 12:18 PM   #219
DRD2
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Quote:
Originally Posted by Stinger9 View Post
I lost track, did you systematically examine and tighten all the appropriate electrical connectors yet?
I can't say that I systematically examined, tightened and replaced the electrical connections, but I was conscientious about it. I'll go back and pay close attention to each and every one. What I've done so far:

Replaced O2's
Sparks
Fuel pump
Fuel regulator
Cleaned MAF
Rebuilt DISA
Rebuilt VANOS including rattle kit
Replaced both cam position sensors

Each one of these things has helped the car run better. In fact, it's running like a bat outta hell. The only problem is the 2500 - 3000 RPM stutter, and now it's intermittent. Most of the time it does't do it, sometimes it's light, and one time it bucked like hell. I can't discern a pattern.

A wildcard: I replaced both CPS's with OEM equivalent from Arizona Autohaus. The exhaust side threw a code the first time I started the car up, and it appears that it was bad out of the box, so I pulled it and I put the old one back in.

My question is if the software update has fixed a lot of evil, why don't the local shops know about it?
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Old 12-16-2013, 12:54 PM   #220
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Originally Posted by DRD2 View Post
I can't say that I systematically examined, tightened and replaced the electrical connections, but I was conscientious about it. I'll go back and pay close attention to each and every one. What I've done so far:
Refer back to post #1 on this thread with regard to the connectors. Best first approach would be to make sure the two CPS's connectors are making great contact. Also helps to spray with a bit of CRC contact cleaner.
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