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Old 01-02-2019, 05:37 PM
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semcoinc semcoinc is offline
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Location: Dallas, TX
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JimG

Yeah, check fluid level first

I ran into this problem with my 3.0 E46 transmission with no transmission engagement in cold temps (neither drive nor reverse) until a very warmed up coolant temp.

Here is the thread on E46 fanatics.

https://forum.e46fanatics.com/showthread.php?t=893453

My problem went away when I replaced the solenoids in the thread.

These were my PNs and prices back in 2017 when I solved my issue in my 3.0 E46:

Main pressure regulator solenoid - AC Delco 10478146 Amazon Prime $36.00

Torque converter lock-up clutch solenoid - AC Delco 24227747 Amazon Prime $23.00

Here is another narrative with transmission info

Transmission Valve Body Removal & Installation, Filter, Fluid Service

Just a significant lowering of the valve body was necessary to swap out the solenoids.

My theory on why this symptom manifests itself is because the o-rings in the solenoids harden and shrink over the years and miles. This causes them not to function as designed until they warm up and become pliable and do their o-ring job

Mike
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Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i Pearl Beige
2003 E46 330Xi Monaco Blue
2007 E90 335Xi Black Sapphire Metallic
2011 F25 X3 28i Black Sapphire Metallic

Last edited by semcoinc; 01-02-2019 at 05:50 PM.
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