Limp mode.

[macdon]

I have just removed & cleaned the throttle body and idle valve on my 2l 1999 Z3, 84000mls. I also renewed the DISA valve diaphragm (which I am not satisfied with).
After reassembly all was well except it is gutless so I presume it has gone into a limp mode(?), no MIL light showing. Can I correct this condition without the use of a scanner?
Any assistance most welcome.
Alan.

 

[ExMX5owner]

I have just removed & cleaned the throttle body and idle valve on my 2l 1999 Z3, 84000mls. I also renewed the DISA valve diaphragm (which I am not satisfied with).
After reassembly all was well except it is gutless so I presume it has gone into a limp mode(?), no MIL light showing. Can I correct this condition without the use of a scanner?
Any assistance most welcome.
Alan.

A scanner obviously would help, but may I suggest you have introduced a vacuum leak, with the work you have done ?..Just a thought...

 

[macdon]

A scanner obviously would help, but may I suggest you have introduced a vacuum leak, with the work you have done ?..Just a thought...

Thanks, I feel you could be right. A side issue for the work was to see if I could find the cause of a whistle that has been present since I bought it a couple of years ago, looks like I am going to have to change the PCV system

 

[ExMX5owner]

Thanks, I feel you could be right. A side issue for the work was to see if I could find the cause of a whistle that has been present since I bought it a couple of years ago, looks like I am going to have to change the PCV system

The work you recently did all involves vacuum in some way, hoses etc get brittle and split easy when worked on, good luck...

 

[NZ00Z3]

Vacuum leaks are best found by a smoke test. Read this thread: https://www.e46fanatics.com/threads/how-to-smoke-test.1261077/#post-18615547

 

[colb]

Any codes been set is the EML lit?
With a decent code reader that can look at live data see what the fuel trims are doing, high is usually down to air leaks somewhere across the engines vacuum system split or holed pipes. Smoke test will find any you can't see or hear. Your symptoms can also be attributed to a bad Maf when that fails car feels like it's being held back, always replace Mafs with OEM brands Bosch or Seimens don't buy cheap ones you end up paying twice.

 

[macdon]

Many thanks all for your advice.
I couldn't find any obvious leaks so I decided it must be hidden with the most likely culprit to be the CCV system. Sure enough after much swearing & personal damage I found a broken pipe, replaced the whole system and now all is well. Thanks again.