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05-02-2023, 02:32 AM | #1 |
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Drives: 2011 E82 128i, 1989 E30 325ix
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2011 128i N51 Crank no start issue
Hello all, I’m scratching my head with an issue that I can’t seem to resolve. First let me list what has already been checked and replaced. Replaced low pressure and high pressure fuel pumps (OEM), spark plugs ngk iridium (gapped to spec). Replaced coils Bosch (OEM), Replaced air intake filter (K&N), replaced fusible Link (OEM) replaced radiator (OEM), Replaced valve cover and gasket (OEM), Replaced eccentric shaft Sensor and seal (OEM), replaced fluids everything OEM recommended except for Oil I use AMSOIL products for oil changes and filters. Checked all fuses and replaced with new ones. Replaced ignition Harness (OEM). Replaced MAF Sensor (OEM), I’ve checked the ECU for any water damage and all the prongs still look healthy and new, I bought the car used and drove it for over a year with no issues, I’m a stickler for maintenance so I’ve kept up on my recommended mileage maintenance schedule the only thing I haven’t looked at is my VANOS acuators. One day I experienced some misfires and rough idle, I proceeded to diagnose the issue and pulled codes with a Bosch scanner. Found only misfire codes for 3 of the 6 cylinders, this was an intermittent issue but bothered me to no end, I ordered up some
New spark plugs and coils I use FCP Euro and Pelican Parts for everything. I replaced the coils and plugs and the car ran fine for about another week after clearing the codes and replacing parts. The issue then came back, I figured maybe just a bad batch of coils so I ordered some More and replaced them, ran fine no issue. 1 month later it happened again, I decided to have my injectors cleaned and flow tested and changed my air filter, injectors passed inspection and I replaced the seals, the issue still persisted and I got some new codes on different cylinders this time, as well as the MAF Sensor and the EAC Sensor radiator, I replaced both the MAF Sensor and radiator. The issue still persists, I take the 1 series to my buddies shop as he is a reputable BMW mechanic and does good work, I requested a compression test and boroscope fearing the worst. My buddy checked it out and the engine came back healthy on the compression test and the boroscope indicated no damage to any cylinders. He replaced some coils with spares he had around from an engine swap and the car ran fine, I drove the car back home from The shop and the issue began again, I decided I wanted to replace the fuel pumps and the ignition harness. Replaced the fuel pump and the car runs but still misfires, I then proceed to replace my valve cover and gaskets while waiting for the harness to ship to me. I replaced them and the car ran awesome, no hesitation, misfires or rough idle. I received my ignition harness a week later and replaced it because I couldn’t stand the sight of the old one it was rough looking and I had a feeling it was time to replace it, I swapped it out and now the car will crank but won’t start, new battery and fully charged, can someone please help Me with this issue? Does the harness need to be registered? Is there anything I should be looking for? |
05-02-2023, 02:37 AM | #2 |
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Drives: 2011 E82 128i, 1989 E30 325ix
Join Date: May 2023
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I also replaced my o2 sensors and all my fuses just to be on the safe side.
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05-02-2023, 08:48 AM | #3 |
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Drives: BMW 128i
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Location: Connecticut
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My first thought was battery. Batteries on this car make it do crazy shit.
Check the red battery power distribution box. You might have missed one of the connectors or it may have shorted out when you were back there. Also check your ground straps. There are two, one on the driver's side near the steering column and one on the passenger side near the back of the motor near the exhaust manifold. Best of luck. |
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BimmerxVision15.00 |
05-02-2023, 09:22 AM | #4 | |
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Quote:
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05-02-2023, 09:42 AM | #5 | |
J
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Quote:
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BimmerxVision15.00 |
05-16-2023, 09:44 PM | #6 |
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UPDATE! Got the car to start, it was the ignition harness connector that plugs Into the DME, Car starts and runs great, one concern I have is extended cranking time or multiple cranks to start, I’m not sure how long it will take the DME to relearn everything I reset all adaptations and cleared all codes stored in memory. Any suggestions on extended cranking troubleshooting? I will repost this question in its own thread as well.
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05-13-2024, 08:20 PM | #7 |
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Drives: 2011 E82 128i, 1989 E30 325ix
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UPDATE! Got the car to start, it was the ignition harness connector that plugs Into the DME, Car starts and runs great, one concern I have is extended cranking time or multiple cranks to start, I’m not sure how long it will take the DME to relearn everything I reset all adaptations and cleared all codes stored in memory. Any suggestions on extended cranking troubleshooting? I will repost this question in its own thread as well.
UPDATE! I still had a little misfire, rough idle and very poor fuel efficiency, this was an intermittent but annoying issue, I finally broke down and bought a Carly tool from Germany since they are pretty reasonably priced and I’ve heard great things about them. I’ve since read out all my codes and done more research to find a very sinister yet massively overlooked issue on bmws, the crankshaft position sensor is known to fail and cause issues with crank no start, poor fuel economy, rough idle and misfiring. I removed my intake and found broken pieces from the DISA valves in my cylinder head, fortunately I caught this before anything catastrophic happened, changed my gaskets for intake and throttle body, replaced the sensor, o-ring and bolt. Do not I repeat do not reuse aluminum bmw bolts unless you want bigger issues. Aluminum bolts are torque to yield and one time use, I learned this lesson the hard way and had to replace the bolt after breaking it off into the block, I then had to drill it out and retap and die the bolt hole, super lame experience for what should have been less than a thirty minute job, to make it even easier remove your starter and replace those bolts before reinstalling as well. To sum it up all my issues that I spent money chasing were all because of 1 sensor and now my car runs like a dream! The extended cranking issue turned out to be a synchronization issue between two failed sensors the crank and cam sensors, replaced both and have perfect idle and drive running conditions and no longer have extended cranking time. |
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spidertri456.00 cerealwars161.00 |
05-14-2024, 07:30 AM | #8 |
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Drives: 11 128i 6MT Sport
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Thanks for following up on the solution, I'm glad you got it figured out because it sounds really frustrating.
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05-15-2024, 12:52 PM | #9 |
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Drives: 2011 E82 128i, 1989 E30 325ix
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Thanks bro, I really like posting in forums because that’s how I solve a lot of my issues when I’m self diagnosing or performing repairs and I figured the least I can do is make it so someone has the opportunity to stumble on a solution if they have similar issues.
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