I just completed a m52 OBD2 swap and am having problems. The car was feeling really sluggish between 2500rpms and 4000rpms. I called a shop and they said check to see if the vanos is getting 12v. I checked between that rev range and it is getting 0v. I checked my wiring harness connections at the cam/crank harness and they all seem connected correctly. Is there a fuse for the vanos somewhere that may have blown? What am I missing?
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Vanos not getting power
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No, I connected the Vanos to the y harness and the other part of the y to the fuel rail. To verify there is no power to the vanos, I unpluged the vanos and put a multimeter on the female section on the y harness that connects to the vanos. There was no voltage at any rpm. I think it is supposed to activate (12v) between 2500-5000. The other two plugs on the y are connected to the cam sensor and crank sensor.
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Have any codes? Vanos/Cam sensor codes will shut down vanos and it wont ever sent voltage to solenoid....
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Needing a harness adapter or wiring help? Check it out: also have 24v motor mounts, E30 M3 covers and E36 ECU mounts!
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OBD2 Tuning Available! OBD2 E36, S54 Swap, S62 Swap, etc: tuning@MarkertMotorWorks.com Dyno Thread
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I started the engine with a full tank of 87 octaine. I had a check engine light after the first 15 minutes. Drove it about 12 miles or so and I got these codes at first:
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Then siphoned it and filled it up with 91 and cleared the codes. Only driven it two miles. No codes yet, but the vanos is still not getting power.
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I'm betting the vanos code is still there just hasn't posted to obd2 pids yet.
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Needing a harness adapter or wiring help? Check it out: also have 24v motor mounts, E30 M3 covers and E36 ECU mounts!
Full Product Line Tuning
OBD2 Tuning Available! OBD2 E36, S54 Swap, S62 Swap, etc: tuning@MarkertMotorWorks.com Dyno Thread
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Originally posted by cormier View PostDme/tune from that motor or from another?
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Originally posted by DesertBMW View PostLook up wiring diagram and check for continuity directly from the ECU plug to Vanos plug,
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download this. check page 564(assuming you have a 96-97 m52). green/blue and red/white wire to vanos solenoid. looks like the dme grounds it with the green/blue wire. trace the red/white wire back to the common connection point. it looks like a lot of components share that same power source(look at center of diagram). if your injectors have power so should the vanos solenoid. if it doesnt i would suspect a break in the wire somewhere before it reaches it
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