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2008 z4 wouldn't start, replaced battery still no start.

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2008 z4 wouldn't start...

2008 z4 wouldn't start, replaced battery still no start. Jump started from my jeep. It starts and will run at idle, put any load on engine like a/c or revving it dies and won't restart without a jump. Replaced alternator, same problem. Got a Carly for BMW with wifi, no codes and tells me I don't need to register new battery on this model, stumped

Mechanic's Assistant: Do you have a scan tool to read the codes?

Followed the Carly directions . Showing no codes

Mechanic's Assistant: Are you fixing your Z4 yourself? What have you tried so far?

Replaced battery and alternator

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Car has been sitting for a while, but no known issues, trying to get it running so I can renew tags

Submitted: 10 months ago.Category: BMW
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Answered in 1 day by:
8/21/2017
BMW Mechanic: JayPutelis, Shop Foreman/ BMW Master Tech replied 10 months ago
JayPutelis
JayPutelis, Shop Foreman/ BMW Master Tech
Category: BMW
Satisfied Customers: 907
Experience: 14 yrs Experience; ASE Master Technician; ASE L1 Certified
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Hi can you please provide the last 7 digits of the VIN for further assistance?

Thanks, JP

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Customer reply replied 10 months ago
LG19687
BMW Mechanic: JayPutelis, Shop Foreman/ BMW Master Tech replied 10 months ago

Do you have a multimeter with knowledge of how to use?

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BMW Mechanic: JayPutelis, Shop Foreman/ BMW Master Tech replied 10 months ago
Perform a resistance check from the ground lug (jump start terminal) under the hood to the oil filter housing (metal part of engine) and report please.
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Customer reply replied 9 months ago
Checking the ground lug to multiple points on the engine I get the same readings 000
Customer reply replied 9 months ago
Checking as you recommended and various other locations all readings are 0000
BMW Mechanic: JayPutelis, Shop Foreman/ BMW Master Tech replied 9 months ago
Do you have an assistant that can start the car while you do another check with the multimeter? If so, the same location you checked the resistance of the engine ground, now check for DC voltage while someone starts it. We are checking for a lice voltage stop here.
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Customer reply replied 9 months ago
It won't crank without a jump
BMW Mechanic: JayPutelis, Shop Foreman/ BMW Master Tech replied 9 months ago
It doesn't gave to crank. Just check the voltage when trying to start it
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