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11-07-2020, 12:14 PM | #1 |
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Starter or ground strap?
im having a very specific problem with my e92 M3.
The car starts perfectly fine on mornings where the temperature is above 45°F, after sitting all night. On cold mornings is where i seem to have the issues. The car does not even attempt to start if it is too cold in the morning. But once it starts it has no problem starting for the rest of the day no matter how cold it is. Im leaning towards the solenoid in the starter going bad but someone had suggested the ground strap as a potential culprit as the metal can expand and contract in different temperatures, possibly moving the connection. I just had the strap mentioned to me and have not had a chance to look at the condition of the strap just yet. Just trying to see if anyone else has had a similar problems and could offer any solutions. Thanks! |
11-08-2020, 10:33 PM | #3 |
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Since you mentioned temperature, I would check the battery. If it's a cold morning and your battery is on the edge it might throw in the towel.
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11-09-2020, 12:18 AM | #4 | |
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01-28-2022, 03:01 PM | #6 | |
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Ever find a solution to this? Having a similar issue. Here’s an example: https://share.icloud.com/photos/07ac0ndVDOFNLgevicnt1z7wA#Laurel |
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01-28-2022, 04:08 PM | #7 |
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Which one is that? Weird that you say that and offer him zero insight.
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01-28-2022, 07:38 PM | #10 | |
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At starter - 12427840580 At exhaust - 12427840591 Full kit - 12427840580KT
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10 E90 M3 /// Dinan Intake, X Pipe, Exhaust, Underdrive, 3.62 Diff, Coilovers, Alpine e85 Tune - sold
16 F80 M3 /// MaxPSI 4 Pin, DP, CP, SL Mid-Pipe, TMIC, KW HAS, EU5's, AB Performance Flex Tuned |
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02-03-2022, 06:03 PM | #13 |
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02-05-2022, 07:54 AM | #14 | |
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Easy to rule the ground in or out. Then move to battery/alternator since they are next easiest to test. Then to starter. You can just make a replacement ground if you have the supplies. If not, measure and find an off the shelf part with the correct bolt hole size or terminals with enough meat to drill out larger. Or buy BMW's perfect fit ground. There are also grounds at the tail pipes that are often rotten out that are probably there for a reason on these cars. There may be grounds at the hood hinges -- I cannot recall since I moved on to another car last year and am in the process of forgetting E90M3 tech and learning another car tech. I am just a DIYer and am best at remembering the cars I have. Last edited by pbonsalb; 02-05-2022 at 08:00 AM.. |
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04-23-2024, 11:55 AM | #15 |
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I was having the same symptoms. Long crank, battery was reading 12.7 v. The battery and alternator are both less than 3 years old. I had a track day recently where my TCS was very intrusive. When I got back to the paddock the yellow brake light, brake symbol and exclamation point were all on. I got under the car to take a look at the ground strap under the engine. It was completely green. It was NOT degrading in any way with slight twisting and inspection. It was very loose. I tightened it up with a 13mm wrench. The long crank was gone!. TCS acted normal. No more issues.
Fix: Try the extra ground test. If it starts fine or better check the ground strap. |
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04-23-2024, 03:31 PM | #16 | |
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