E32 750iL some queries

[Abdalla.1990]

Hi all
i still have some quires regarding my E32.

* my car is running without catalytic and with 2.5 '' Y-Pipes exhaust. OS sensor are replaced recently. but i can smell a huge carbon smell with little black smoke, what could be the problem.

* some times when kick down the pedal for the first and second gear; EML light turns on and i have to stop the car and turn it off for 2-3 min then it will work fine. can anyone explain to me what is EML and why its turn on.

[shogun]

Black smoke means unburned fuel. Maybe the fuel pressure regulators are not working properly. Check the vacuum hoses which go to the fuel pressure regulators, if they are broken/brittle. Pull the vacuum hoses from the fuel pressure regulators and check if fuel comes out, if so, FPR damaged. see this video http://www.bimmerboard.com/forums/posts/1265429/ In case the problem is no sparks on all 12 cylinders and the ignition wires are the problem, I have new sets for M70 on stock to replace the old ones, see in the E32 for sale forum here.
You can test the sparks, if they spark with a inline spark plug tester for recessed plugs like these
https://www.amazon.com/Tool-Aid-2397...PM6NQDQKK4WRWB

[Abdalla.1990]

Thanks shogun, i have to check my spark plugs, wet or dry. but what about the second point, EML?

[shogun]

EML could be the spark plug . EML explained here in detail https://www.europeantransmissions.co...MWtechinfo.htm
under SYSTEM OVERVIEW - I-P-O you can see that many components send their signal to the EML module, which is processing them. Most common fault is that the throttle valves (DK) are too dirty and are not in sync, if they are out of sync more than 2%, automatically the EML light comes on and the engine goes into limp home mode. So you might clean them up and test measure them, specs are on my website, click on the left index reference data, there you find the details.
Copied another case from my website: Cylinder identification sensor For '91 750il: bank two is not running but no eml light is showing.
Initial Checks: Both fuel pumps OK. Fuel is flowing to both regulators ok. Checked the spark on bank 2 and all wires have ok spark. A fault code is stored saying that there's a problem with the ignition on bank 2. Viewed the fuel injector pulsewidth and it's at .4 ms and shows the load being at 0 on bank 2. other side has normal readings. Also the scan tool says the the ignition fault would cut off fuel injector pulse width. Tried swapping coils, dme and maf, nothing changed.
Solution: The spark plug on # 12 was fouled causing the signal from the cylinder identification sensor #2 (bank 2) to be skewed because it is driven by cyl. number 12 spark plug wire for info to the DME. It thought that it had a dead cylinder and the engine management was cutting off fuel to that bank!

DK cleaning http://www.mwrench.com/Whitepapers/DKMotorcleanup.pdf
see Reconditioning BMW E31/E32 - M70 / 750il, 850i Throttle Assemblies http://bmwe32.masscom.net/index.php