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10-02-2021, 08:10 PM | #1 |
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Really weird stuff, airbag, radio, blinkers
Hello everyone,
I pulled the plug and got me a Z4M 2006 roadster. Paid cheap (for today’s trends) for a 146k miles car with the engine rebuilt 12k miles ago. I just drove 220miles to go back home to Savannah GA, and o. The way back I noticed really weird behavior. Cruising at 75MPH I was trying to play with the nav to see if it worked. GPS lock is wrong, it sees me in the ocean. Meh. But that’s not it. The Airbag light comes on, for a few seconds, then off again. Then repeat. While bag light is on, the blinkers don’t work. The auto blinker repeat never works, but sometimes if trying to use blinkers while bag light is coming off, blinkers will stay on for 5 repeats after a long/hard pull on the control (past the physical detent). The cruise will continue to operate. The radio nav unit will freeze. Neither the controls on the center dash nor on the steering wheel will work. For a few seconds. Then it’s all good and dandy. After a little of this, the Service Engine Soon light came on. I decided to slow down a bit and eventually cruised for 150miles at 65MPH. No problem. I then accelerate towards 75-80MPH and again, all the craziness. Could the short be something in the engine bay, like the actuator in the intake manifold (I am guessing there is one, correct me if I’m wrong, for variable intake geometry). Any ideas? Monday I will go to title office and then to a recommended garage. |
10-02-2021, 10:42 PM | #2 |
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I'd start with the battery. These cars do some weird stuff when the battery's on its way out.
Did you get that car from ormond beach?
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10-02-2021, 11:15 PM | #3 |
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Yes it is from Ormond Beach. Florida is beautiful! But boy is it hot…
Much better roads than in Georgia! And Daytona… I guess I will be back there. BTW the former owner is restoring a Mach1 that is crazy beautiful. So, first stop is replacing the battery? I did order an OBD dongle (stupid me I left my expensive one in Italy) to read the code(s) that triggered the Engine Service light |
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10-02-2021, 11:18 PM | #4 |
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BTW… the engine takes quite a few revolutions to crank. In YT videos it seems to crank as fast as a Fiat with a 0.9 liter engine.
I don’t mind a long crank, reminds me of exotics like the Lamborghini V12’s… but I do question myself as to what the reason might be. |
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10-02-2021, 11:46 PM | #5 | |
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Drives: Z4 M, X5, GX460
Join Date: Apr 2008
Location: CT
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.53] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
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Hopefully the motor was rebuilt by reputable shop. |
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10-02-2021, 11:51 PM | #6 |
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It reportedly was. Doing a but and ear driven NVH assessment, the engine runs smoothly and pulls aggressively. It might not tell much, but it’s a promising starting point
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10-03-2021, 11:31 AM | #7 |
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Check alternator voltage output…. Battery voltage when cold…
Also check alt output at 65mph and at higher speeds where you say the issue is… Basic stuff but always a good starting point when dealing with potential electrical issues. I would also take drive belt off and put new one on…. Check all pulleys and such for issues and replace if required
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10-03-2021, 04:56 PM | #8 | |
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10-06-2021, 09:27 AM | #10 |
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With 146K miles on it you should definitely change the alternator and battery (if it's over four years old) and just take those out of the equation. Alternator swap is relatively easy and you don't have to get under the car.
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10-06-2021, 09:42 AM | #11 |
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I just replaced the battery with a Die Heard Platinum H7. The car had a much smaller battery in, 3 years old. It was barely cranking.. especially on a cold start it would take many revolutions to start.
This morning with the new battery it started immediately. I am also waiting on an ignition switch which I can easily replace. That should rule out two common and easy things. Will keep you posted! |
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11-07-2021, 12:02 AM | #12 |
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If not the entire alternator I would change the voltage regulator on the alternator. I had the exact same symptoms on my last Z4MC. It's like a $40 part and it solved all my issues
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11-15-2021, 04:20 PM | #13 | |
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