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'03 Z4 2.5 Engine problem(s)
I'm hoping someone here might be able to help me to determine if several engine issues are related. My husband and I have a 2003 Z4 2.5 with 20,000 miles that over the last three months has been serviced for engine problems and I'd like to know if any of the repairs may have impacted our current problem -- chips out of the pistons that will require a repair not covered by warranty to the tune of $8,600!
The first service was required after the service engine light came on, with the car sputtering and having no power for acceleration. Service included:
- replacement of pulse generator on the exhaust camshaft and FC 28AC specified torque monitoring restored
- Installed new DME
The second service was when the check engine light came on and the engine was running very rough. Service included:
- Removed and replaced 6 IGN coils
And now for the "fun" part...
My husband was driving the car on the highway Friday at 6pm - fairly heavy traffic- going about 70mph and a car cut in front of him. In order to avoid an accident (Thank you BMW driving school!) my husband stood on the brakes and downshifted from 5th gear into 3rd gear, thankfully avoiding contact with the other car. After the downshift, the Z lost power to accelerate and he pulled over in the breakdown lane and the car stalled and failed to restart. We towed it to our dealership and told them what happened.
They are saying it was an over rev situtation and not covered by warranty. Shouldn't the car be able to handle a downshift like that? Or aren't there any safety overrides that should have kicked in to protect the engine? Could any of the prior service issues had an impact?
I'm just trying to understand it all better because I would have thought the car should have been able to handle it without blowing the engine - pistons!!
| | Reply » '03 Z4 2.5 Engine problem(s) |
Quote: I'm hoping someone here might be able to help me to determine if several engine issues are related. My husband and I have a 2003 Z4 2.5 with 20,000 miles that over the last three months has been serviced for engine problems and I'd like to know if any of the repairs may have impacted our current problem -- chips out of the pistons that will require a repair not covered by warranty to the tune of $8,600!
The first service was required after the service engine light came on, with the car sputtering and having no power for acceleration. Service included:
- replacement of pulse generator on the exhaust camshaft and FC 28AC specified torque monitoring restored
- Installed new DME
The second service was when the check engine light came on and the engine was running very rough. Service included:
- Removed and replaced 6 IGN coils
And now for the "fun" part...
My husband was driving the car on the highway Friday at 6pm - fairly heavy traffic- going about 70mph and a car cut in front of him. In order to avoid an accident (Thank you BMW driving school!) my husband stood on the brakes and downshifted from 5th gear into 3rd gear, thankfully avoiding contact with the other car. After the downshift, the Z lost power to accelerate and he pulled over in the breakdown lane and the car stalled and failed to restart. We towed it to our dealership and told them what happened.
They are saying it was an over rev situtation and not covered by warranty. Shouldn't the car be able to handle a downshift like that? Or aren't there any safety overrides that should have kicked in to protect the engine? Could any of the prior service issues had an impact?
I'm just trying to understand it all better because I would have thought the car should have been able to handle it without blowing the engine - pistons!! |
If he downshifted into 3rd gear at 70 MPH, then he wouldn't have over-revved it, I don't think..(not sure, though.. I'm guessing redline in 3rd gear would take you over 70 MPH) My guess is he downshifted into first gear, thus blowing the engine... It is a manual transmission.. when you are accelerating there is a rev limiter, which cuts engine power... but, even if you are coasting at 70 MPH with the engine off, you would over-rev it, if you shifted it into 1st or 2nd gear.... It is a mechanical hook-up, and there is no way for the car to prevent it..
The OBD computer records over-revs.. I think you are going to be out of luck.. I don't see how any of the other problems would affect this, especially when you have another explanation..
regards,
kyfdx
| | Reply » '03 Z4 2.5 Engine problem(s) |
Quote: If he downshifted into 3rd gear at 70 MPH, then he wouldn't have over-revved it, I don't think..(not sure, though.. I'm guessing redline in 3rd gear would take you over 70 MPH) My guess is he downshifted into first gear, thus blowing the engine... It is a manual transmission.. when you are accelerating there is a rev limiter, which cuts engine power... but, even if you are coasting at 70 MPH with the engine off, you would over-rev it, if you shifted it into 1st or 2nd gear.... It is a mechanical hook-up, and there is no way for the car to prevent it..
The OBD computer records over-revs.. I think you are going to be out of luck.. I don't see how any of the other problems would affect this, especially when you have another explanation..
regards,
kyfdx | Thank you for responding. How do I go about finding out what the OBD computer reported? Is it something I can ask the dealer to print out for me? Again thank you for your thoughts.
| | Reply » '03 Z4 2.5 Engine problem(s) |
I think the gearing is different between the 525 and the Z4, but a 5-3 downshift at 70 does not cause an overrev. Must be (1) something else or (2) accidental shift into 1st.
| | Reply » '03 Z4 2.5 Engine problem(s) |
Quote: If he downshifted into 3rd gear at 70 MPH, then he wouldn't have over-revved it, I don't think..(not sure, though.. I'm guessing redline in 3rd gear would take you over 70 MPH) My guess is he downshifted into first gear, thus blowing the engine... It is a manual transmission.. when you are accelerating there is a rev limiter, which cuts engine power... but, even if you are coasting at 70 MPH with the engine off, you would over-rev it, if you shifted it into 1st or 2nd gear.... It is a mechanical hook-up, and there is no way for the car to prevent it..
The OBD computer records over-revs.. I think you are going to be out of luck.. I don't see how any of the other problems would affect this, especially when you have another explanation..
regards,
kyfdx | production "crotch rocket" motorcycles employ "back torque limiting" devices in their clutch setups which inhibit the ability of the rear wheel to "drive" the engine, this allows multiple gear downshifts (i.e. 6th to 2nd) without over revving the engine or causing the tire to slide. This of course doesn`t help the unfortunate lady above. For $8600 I hope she gets a new short block
| | Reply » '03 Z4 2.5 Engine problem(s) |
Quote: | production "crotch rocket" motorcycles employ "back torque limiting" devices in their clutch setups which inhibit the ability of the rear wheel to "drive" the engine, this allows multiple gear downshifts (i.e. 6th to 2nd) without over revving the engine or causing the tire to slide. This of course doesn`t help the unfortunate lady above. For $8600 I hope she gets a new short block | Interesting. So, on one of these motorcycles if you did a multi-gear downshift that would, lead to an engine spped that's too high, what happens? The engine just goes to redline in those cases?
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'03 Z4 2.5 Engine problem(s)