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#1
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Trans Failsafe
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport |
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#2
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Not sure if the 4.6 has the same connector as the 3.0i but my e53 had the connector get water in it so i suspect "wash" is directly related.
If you have a big round connector on the back/bottom of your trans take it off and look for signs of water and clean it.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#3
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Did yours have similar symptoms to mine? This seems more mechanical. I did find a used good trans from a guy I know who has a couple 4.6 part outs.
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport |
#4
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Horrible slam shift one time but when it happened while at speed it just stayed in 5th until i went slow enough then stays in 4 th only. Makes for very anemic launch and very difficult to drive up onto a curb to climb under to fix.
I had it happen once when parked for a couple months and twice while driving and when getting splashed by slush or water from passing semi. It's more of the coincidence of right after water incident and you mention washing the car that seems to be way too much of a coincidence. Def check the connector before doing anything else. The shorted wires can make for just about any error and any symptom. In my case at least the first time it shorted the pins to the selector switch and made for random gears.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#5
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Hmm.. Sounds like what happened to mine a few years ago. Same symptoms - no forward drive but OK in reverse.
One way to check if it's terminal is run the engine and go through the gears manually and if the cluster indicator says it won't select or stay in 3rd (or it could be 4th I can't remember) then you can be sure it's one of the drum packs broken. It cost me £2100 here in the UK 3 years ago but mine is a 4.4 so the trans is more common than yours. Check out Zero to 60 on YouTube. He is / was a BMW Australian guy and had a red 4.6 that they rebuilt themselves a few years ago. Interesting. |
#6
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Quote:
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport |
#7
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Quote:
you may need a full internal rebuild. there's less a chance it could be an electrical issue, after you have done some common sense troubleshooting or not. look at your fault codes from transmission.
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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project. |
#8
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Quote:
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport |
#9
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right, this is due to mis-match in input vs output speed sensor. clutches have no apply pressure and so nothing goes except for a gear 5 failsafe option.
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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project. |
#10
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Sourced a used 4.6 trans with 107k on it and having the torque converter rebuilt before putting it in. I will do new filter / oring / pan gasket / fluid(leaning towards Valvoline import LT71141) / torque converter seal / rear crank seal / potentially the rear coolant jacket. Inspected the bellhousing to confirm it was a 4.6iS trans.
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport |
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