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V6 auto box losing o/d 4th gear


 
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Doglet



Joined: 04 Jun 2022
Posts: 49
Location: Wantage

PostPosted: Fri Jul 29, 2022 13:05    Post subject: V6 auto box losing o/d 4th gear Reply with quote

Hi.
Any advice on an odd problem with the auto box in my V6 2003? All four gears shift happily when cold (oil has been changed) but after about 30-40 miles, when it downshifts to third (for instance, uphill) it won't shift back into o/d 4th. Stays with only three gears until it has cooled down.
Dashboard light works when manually pressing the button and shifts from 4th to 3rd when cold, but when on a decent run, when it shifts to 3rd it won't shift back to 4th.
Just covered 140 miles in 3rd, kills the fuel consumption and I had to upset all the truckers when keeping the rpm down to a sensible level (around 55 mph!)!
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PostPosted: Fri Jul 29, 2022 13:05    Post subject: Google Ads keep this community free to join!


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Doglet



Joined: 04 Jun 2022
Posts: 49
Location: Wantage

PostPosted: Sun Aug 21, 2022 20:50    Post subject: Reply with quote

Must admit I am a tad surprised. 75 views, not one response. As a new chap on this owners club, I have to confess I am disappointed.
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Lewis
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Joined: 25 May 2006
Posts: 16291
Location: Huddersfield

PostPosted: Mon Aug 22, 2022 9:49    Post subject: Reply with quote

The problem is not the club. it is the vehicle.

Advice is only forthcoming from other members, who have the same vehicle. There are few members with a V6 and even fewer of those who have the mechanical knowlege to answer your problem.
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andyman



Joined: 08 Dec 2012
Posts: 5601
Location: Penrith

PostPosted: Mon Aug 22, 2022 16:01    Post subject: Reply with quote

Where 2.8TDs have had this problem, IIRC sometimes it is a temp sensor issue, as top gear selection is inhibited until the engine is warm. The issue can be triggered by a low coolant level not touching the sensor.
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Lewis
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Joined: 25 May 2006
Posts: 16291
Location: Huddersfield

PostPosted: Mon Aug 22, 2022 18:47    Post subject: Reply with quote

Andy That is in relation to O/D not working until the engine / transmission is at normal working temp.

Note Doglets last line, in his first post, indicates the engine/ transmission will have been at normal working temp for over 100 miles.
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andyman



Joined: 08 Dec 2012
Posts: 5601
Location: Penrith

PostPosted: Tue Aug 23, 2022 14:11    Post subject: Reply with quote

Ah, but how does the transmission "know" that it has reached working temperature? Does the ecu need a permanent signal from sensor(s) to maintain O/D engagement? Another possibility - overheating O/D solenoid coil? I'm assuming it has to be energised to maintain O/D, rather than the opposite? Curious that O/D works when cooled off. If the actuating mechanism is a bit stiff, there could be enough return spring pressure to ensure disengagement, but increased resistance in the solenoid coil windings due to heat, might be enough to prevent actuation/engagement of O/D?
I'm grasping at straws here, never had an issue with the L300's O/D.
Any thoughts from our resident electrical/electronics experts?
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