Suggestions WANTED to Z4 E85 starting issue.
04 Z4 E85 with 23,800 miles bought used in 07 with 15K miles.
No service other than oil changes.
Problem presentation has been over the past 18 months so now is time to fix.
Problem when car is cold and upon start after about 20 seconds engine has major skip and may continue to run for another 15 to 20 seconds and then will often cut off. After 2 or 3 more cycles of starting , running engine for 10 to 15 seconds the engine will then continue to run fine and then throughout the day no starting problems will be experienced.
Occasionally in one of those +/- 5 starting cycles engine will start and run but with very rough idle ( pressing gas pedal does not change RPMs) requiring that I perform a manual throttle reset that will often result in the next start as normal with no unwanted engine shut offs.
Manual throttle reset procedure:
1. Press pedal to floor.
2. Turn ignition to position 3. Non cranking position.
Wait 30 seconds with pedal to floor.
After 30 secs. remove key and let off pedal.
Wait 30 seconds and then start.
Today I started the dance again, but first cleared all codes.
First crank I was presented with the rough idle problem described above.
Read codes:
DME codes present:
28B2 Speed limitation reset
27AT Throttle Starting test
2796 Throttle: Adaptation Value is Incorrect
Cleared Codes.
Performed Manual Throttle Reset.
Started Ok with normal RPM at around 10K but started to drop to 9K and then major skip, but engine did not shut off, ran another +/-15 seconds and then engine shut down. Did not recrank.
Checked Codes same as above:
28B2 Speed limitation reset
27AT Throttle Starting test
2796 Throttle: Adaptation Value is Incorrect
Cleared Codes.
Restarted and this time started fine and ran fine with no shut downs.
Read codes and no trouble found.
My research indicates I may need a DME board refresh at about 1 K in cost.
My local mechanic that owns several BMWs indicated I may need a throttle body cleaning.
My mechanic has so many cars in his lot it may be months before he can take a closer look.
Your suggestions may help in the ultimate repair.
Thanks
04 Z4 E85 with 23,800 miles bought used in 07 with 15K miles.
No service other than oil changes.
Problem presentation has been over the past 18 months so now is time to fix.
Problem when car is cold and upon start after about 20 seconds engine has major skip and may continue to run for another 15 to 20 seconds and then will often cut off. After 2 or 3 more cycles of starting , running engine for 10 to 15 seconds the engine will then continue to run fine and then throughout the day no starting problems will be experienced.
Occasionally in one of those +/- 5 starting cycles engine will start and run but with very rough idle ( pressing gas pedal does not change RPMs) requiring that I perform a manual throttle reset that will often result in the next start as normal with no unwanted engine shut offs.
Manual throttle reset procedure:
1. Press pedal to floor.
2. Turn ignition to position 3. Non cranking position.
Wait 30 seconds with pedal to floor.
After 30 secs. remove key and let off pedal.
Wait 30 seconds and then start.
Today I started the dance again, but first cleared all codes.
First crank I was presented with the rough idle problem described above.
Read codes:
DME codes present:
28B2 Speed limitation reset
27AT Throttle Starting test
2796 Throttle: Adaptation Value is Incorrect
Cleared Codes.
Performed Manual Throttle Reset.
Started Ok with normal RPM at around 10K but started to drop to 9K and then major skip, but engine did not shut off, ran another +/-15 seconds and then engine shut down. Did not recrank.
Checked Codes same as above:
28B2 Speed limitation reset
27AT Throttle Starting test
2796 Throttle: Adaptation Value is Incorrect
Cleared Codes.
Restarted and this time started fine and ran fine with no shut downs.
Read codes and no trouble found.
My research indicates I may need a DME board refresh at about 1 K in cost.
My local mechanic that owns several BMWs indicated I may need a throttle body cleaning.
My mechanic has so many cars in his lot it may be months before he can take a closer look.
Your suggestions may help in the ultimate repair.
Thanks
1066 Country