Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
Results 1 to 9 of 9
  1. #1

    4k major loss of power

    Hi all, 04 zhp w/155k, sharked, afe intake. List of service in last 25k:
    V/c and gasket
    Ccv
    Thermostat and water pump
    Ofh gasket
    Vanos seals
    New plugs @ 120
    Gas disa
    Maf @ 125k

    So here the problem that has me and my indy stumped. I'm throwing codes for banks 1&2 cats bad (cat problems usually show bank 1 or bank 2, rarely borh simultaneously). Symptom is major power loss from 4-5 k, power returns at 5 k. We've double checked all mechanicals and everything appears ok. Cat flow readings look ok.. Software? Shark? Car has updated dme... Thanks in advance

    Sent from my SGH-T989 using Tapatalk

  2. #2
    Join Date
    Jan 2014
    Location
    Lincoln,NE
    Posts
    1,757

    4k major loss of power

    Most likely just the DISA valve. After market software can decrease the effects of the 4k dip. I have Dinan stage 1 and it has reduced it enough to the point of not noticing it.


    Sent from my iPhone using Tapatalk
    2005 BMW 330i ZHP A08
    Dinan Stage 1
    ~ Garry Murphy

  3. #3
    Join Date
    Jan 1970
    Location
    Branford, CT
    Posts
    16,055
    Quote Originally Posted by gmurphy View Post
    Most likely just the DISA valve. After market software can decrease the effects of the 4k dip. I have Dinan stage 1 and it has reduced it enough to the point of not noticing it.


    Sent from my iPhone using Tapatalk
    It was already replaced.
    BP
    2005 330i ZHP / 6MT
    Imolarot / Naturbraun
    2003 330iT / 6MT
    Orientblau / Naturbraun




    It's not the car you drive, it's how you drive it.

  4. #4
    Looks like a well-cared-for car. Even after reading what maintenance items you replaced, my first guess was going to be DISA. as gmurphy suggests. New parts can go bad. I guess more basically, you have fault codes; so what could trigger "bad cats" code?

    It's like you need to have a monitor in place as you drive to capture what various sensors and values are reported.

    The return of power at 5k, does it continue to redline? The fundamentals of gas, air, and spark, in the correct volume at the correct time need to be examined. Not to be redundant, but issues at 4k rpm usually point at DISA or other airflow controls. Looking forward to hearing the root cause. Good luck.

  5. #5
    Join Date
    Jan 2014
    Location
    Lincoln,NE
    Posts
    1,757
    Quote Originally Posted by az3579 View Post
    It was already replaced.
    Mine was replaced and still did it until my DME was flashed with the software.


    Sent from my iPhone using Tapatalk
    2005 BMW 330i ZHP A08
    Dinan Stage 1
    ~ Garry Murphy

  6. #6
    Join Date
    Jan 1970
    Location
    Branford, CT
    Posts
    16,055
    Quote Originally Posted by gmurphy View Post
    Mine was replaced and still did it until my DME was flashed with the software.


    Sent from my iPhone using Tapatalk
    Which he also had done...
    BP
    2005 330i ZHP / 6MT
    Imolarot / Naturbraun
    2003 330iT / 6MT
    Orientblau / Naturbraun




    It's not the car you drive, it's how you drive it.

  7. #7
    Join Date
    Jan 2014
    Location
    Lincoln,NE
    Posts
    1,757
    Quote Originally Posted by az3579 View Post
    Which he also had done...
    Flashed with Dinan S1 is what I meant. I can't feel the dip anymore. Before it was very noticeable. OP Good luck in finding the source of the problem.


    Sent from my iPhone using Tapatalk
    2005 BMW 330i ZHP A08
    Dinan Stage 1
    ~ Garry Murphy

  8. #8
    Join Date
    Mar 2011
    Location
    Baltimore, MD
    Posts
    6,940
    Didn't see the Oxygen Sensors in that list. They are pretty pricey...but the labor is super easy. Highly recommended if you can do it yourself. Would also recommend the Fuel System Maintenance at 120k+ miles. That is to say, Fuel filter and Pump. These cars are getting up there in age, so even if it doesn't have the mileage, things tend to fail if they are made of plastic and rubber.

    Give your Vacuum lines an inspection, too. They can influence the a/f mixture.
    Porsche 944 Turbo Build

    One ride and you'll understand why most rocket scientists are German.

    My ZHP Build 2004-2014 RIP


  9. #9
    subscribed
    '03 330i/6 ZHP TiAg
    2017 Chevy Bolt
    2016 eGolf meh... Gone
    Donated: '97 328i (wife's)
    Sold: Supercharged '96 318 Convertible
    Sold: '05 330/6 ZHP SilverGray

Similar Threads

  1. Minor coolant loss
    By Jon D in forum General -- ZHP Related
    Replies: 21
    Last Post: 01-09-2015, 06:43 AM
  2. Loss in mpg...
    By BimmerWill in forum Mechanical | Troubleshooting
    Replies: 55
    Last Post: 11-01-2012, 12:22 PM
  3. Anti-Freeze Loss
    By BCS_ZHP in forum Mechanical | Troubleshooting
    Replies: 15
    Last Post: 10-14-2012, 05:31 AM
  4. Check engine light / loss of power
    By Tampa330i in forum Mechanical | Troubleshooting
    Replies: 31
    Last Post: 02-14-2012, 03:17 AM
  5. What is this? Oil loss and more
    By HokieZHP in forum Mechanical | Troubleshooting
    Replies: 22
    Last Post: 12-15-2011, 09:47 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •