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Strange Electrical Gremlins. Thoughts?
- Rsipad
- Member
- Posts: 110
- Joined: Thu Dec 02, 2021 4:24 am
- Location: Sacramento, CA
Strange Electrical Gremlins. Thoughts?
Hi all,
A week ago, I started a road trip out to the track. About 0.2 miles into the 4 hour journey, the car started acting strange.
1. The "brake" light came up in orange font, the tire pressure light came on in orange font, and the TC off light also came on.
2. The throttle kept sticking for about 0.3 seconds after letting off above 3k rpm (and only under load, not when blipping the throttle).
3. The e-dipstick would not give a reading throught the entire trip. I tried while idling, driving on the highway, city driving, and even on the track. In all situations, the clock symbol would appear for 5 minutes after pressing the button and then it would time out.
Once I got back home, I tried disconnecting the battery and the MAF. I also checked codes, but nothing is showing up (except the usual MAF code after unplugging it, I cleared it and it went away). All of the issues are still present. Any ideas what could have caused all these problems to appear simultaneously and what else I should check?
Thanks in advance.
A week ago, I started a road trip out to the track. About 0.2 miles into the 4 hour journey, the car started acting strange.
1. The "brake" light came up in orange font, the tire pressure light came on in orange font, and the TC off light also came on.
2. The throttle kept sticking for about 0.3 seconds after letting off above 3k rpm (and only under load, not when blipping the throttle).
3. The e-dipstick would not give a reading throught the entire trip. I tried while idling, driving on the highway, city driving, and even on the track. In all situations, the clock symbol would appear for 5 minutes after pressing the button and then it would time out.
Once I got back home, I tried disconnecting the battery and the MAF. I also checked codes, but nothing is showing up (except the usual MAF code after unplugging it, I cleared it and it went away). All of the issues are still present. Any ideas what could have caused all these problems to appear simultaneously and what else I should check?
Thanks in advance.
2006 Z4 3.0i (Montego Blue)
- enuff_zed
- Lifer
- Posts: 14829
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
Strange Electrical Gremlins. Thoughts?
Item 1 is often associated with a yaw sensor failure, but with all those other issues I think I'd start by checking the battery is good.
- Trav
- Member
- Posts: 333
- Joined: Sat Nov 17, 2018 5:16 pm
- Location: Perthshire
Strange Electrical Gremlins. Thoughts?
If it is not the battery, there are many common grounding points on the car. I included one from an early model Z that shows how the oil sensor is actually grounded with other items on a common point. Sometimes these common grounds can be the source of spurious multiple faults. Although it is unclear why you are not seeing codes. Just another avenue to look for the drawings on and maybe check.
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Z4MR A.W.
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- Member
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Strange Electrical Gremlins. Thoughts?
With no codes coming up, check battery and if good to go, I'd consider changing out the ignition switch. Google: BMW bad ignition switch.
- enuff_zed
- Lifer
- Posts: 14829
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
Strange Electrical Gremlins. Thoughts?
This is interesting and seems to cover a lot of the OPs issues.Trav wrote: ↑Wed Jan 03, 2024 6:45 pm
If it is not the battery, there are many common grounding points on the car. I included one from an early model Z that shows how the oil sensor is actually grounded with other items on a common point. Sometimes these common grounds can be the source of spurious multiple faults. Although it is unclear why you are not seeing codes. Just another avenue to look for the drawings on and maybe check.
- Rsipad
- Member
- Posts: 110
- Joined: Thu Dec 02, 2021 4:24 am
- Location: Sacramento, CA
Strange Electrical Gremlins. Thoughts?
Battery is 2 years old, so it should be good, but it's an easy thing to check so I'll give it a go
Interesting... thanks for the response. I'll have a look at the ground for the oil sensor and check if all 3 issues are connected to the same ground.
2006 Z4 3.0i (Montego Blue)
- buzyg
- Legend
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- Joined: Fri May 20, 2011 6:11 pm
- Location: Cornwall
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- Member
- Posts: 234
- Joined: Thu Jun 23, 2022 7:32 pm
Strange Electrical Gremlins. Thoughts?
If it’s an old battery change it, it can look good on the tester but as soon as you put a load on it the voltage drops. It’s easily your cheapest option, there is no guaranteed life I’ve had then go bad a 6 months, others have lasted 8 yrs, todays electronics are very sensitive to low voltage.
- Rsipad
- Member
- Posts: 110
- Joined: Thu Dec 02, 2021 4:24 am
- Location: Sacramento, CA
Strange Electrical Gremlins. Thoughts?
Issue ended up being the steering angle sensor being out of calibration. No idea why that would cause a sticky throttle or the e-dipstick to not work, but I'll take it
2006 Z4 3.0i (Montego Blue)
- enuff_zed
- Lifer
- Posts: 14829
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
Strange Electrical Gremlins. Thoughts?
Can’t answer the dipstick one but if the car thinks the steering angle is excessive it will activate all the dynamic stability stuff which regulates throttle input.