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E36/7 Z3 (1996-2002)
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Old 07-11-2019, 06:30 PM
Treytaw Treytaw is offline
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Mein Auto:
Cranks, No start

Hi, new here. I am working on my grandma's 2000 Z3 2.3 while they are out of state dealing with family issues. I would really like to get her Z3 going before they get back but I don't seem to be getting anywhere and hope someone here can help. My knowledge with BMW's are minimal anyway lol

So, the car cranks just fine. Cranks and cranks but doesn't fire. I tried pulling codes with my BT OBDII reader and didn't get any faults.

- I wasn't hearing the fuel pump priming at all so I checked fuel pump fuse in driver side fuse box under the hood, it was fine.

- I pushed in the valve on the fuel rail while someone was cranking the car and there was no pressure.

- Checked the plug to the fuel pump for power through the access behind the passenger seat (pretty convenient design I will say). When I turn the key to ON position, I get 12+volts for just 2 secs and returns to 0. So it seems like the pump is receiving power but is there another signal it needs before it will actually run?
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Old 07-11-2019, 07:38 PM
roadsterred roadsterred is offline
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Mein Auto:
The 2 second interval is to prime/pressurize the fuel injection system. When connected the pump should run for the 2 seconds. If it does not run, the pump is defective.

Test the pump by connecting a 12V electrical source directly to the terminals of the fuel pump. If the pump does not run, that is the problem.
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Old 07-11-2019, 08:40 PM
Treytaw Treytaw is offline
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Right, I know it should be priming when the key is on (also why I checked the rail for pressure to make sure because like I said, I couldn't hear it running at all but wanted to see anyway) but I noticed the plug has two other wires and didn't know if there was another signal it was supposed to get from another relay/module for it to actually power on even if it is getting the 12V.
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Old 07-12-2019, 03:04 PM
NZ00Z3 NZ00Z3 is offline
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Mein Auto: 2000 Z3 3.0i
The other two wires are for the fuel gauge level monitor
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Old 07-18-2019, 05:20 AM
Treytaw Treytaw is offline
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Replaced fuel pump, primes like it's supposed to now and have fuel at the rail (checked valve and it's got pressure)....car still won't start. Assuming no spark. Pulled a plug and didn't see any spark coming from the first plug while cranking.

Where's the next place to head. I'm not pulling any codes stored by the computer using Torque App.
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Old 07-18-2019, 06:43 AM
Treytaw Treytaw is offline
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Well....was checking coils for power and decided to go ahead and disconnect MAF as well. Car turned over about 10 times then fired right up and ran. Shut car off and plugged coil back in (one I was reading at the time) and plugged MAF back in. Tried to restart and wouldn't fire.

Unplugged MAF again, turned over about 5 time or so and fired right up again and ran fine....so is the MAF bad or is that a sign of something else.

I'm aware of what the MAF does but don't know if BMW does anything special in conjunction with the MAF....I'm used to working on Chevy's so everything is usually pretty simple but maybe I'm just thinking BMW's are more complicated than they really are lol

I will continue to check for other things in the mean time as I don't want to spend that much money on a MAF for no reason

Last edited by Treytaw; 07-18-2019 at 06:50 AM.
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