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Topic: Overdrive not engaging (Read 1526 times) |
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Jim
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1996 2.3 115k and rising
 
Posts: 121
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Overdrive not engaging
« on: Jan 24th, 2005, 8:50pm » |
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2.3 auto giving much head scratching. 
The overdrive does not appear to be engaging. Turning it on & off brings light on but no reaction from gearbox. During deceleration the overdrive seems to work and can be turned on & off giving additional breaking from the engine. There are no dtc's, oil levels ok, the maf has been cleaned and the gearbox operates without trouble. Incidently what would be the reduction in revs when overdrive is in operation?
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Jim
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waders
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Re: Overdrive not engaging
« Reply #1 on: Jan 24th, 2005, 10:02pm » |
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Jim,
Sure you got a problem? O/Drive (4th gear) wont engage below about 50 mph weather you swich it off and back on again or not. If it was the MAF or a solenoid failing you should expect a flashing O/D light. Try to find o/drive kicking in around 50ish.
HTH
 
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Jim
Full Member
1996 2.3 115k and rising
Posts: 121
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Re: Overdrive not engaging
« Reply #3 on: Jan 25th, 2005, 2:04pm » |
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I've tried it all the way up to 90 but no overdrive. No flashing od lights. ODB readings don't show any errors. What would I expect the torque converter readings to show?
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Jim
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desperate
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Re: Overdrive not engaging
« Reply #4 on: Jan 25th, 2005, 2:06pm » |
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My od kicks in at 55mph and the rev drop is about 500rpm's.
Is the actual switch ok ??
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Eddie
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Must try a different shampoo!
Posts: 495
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Re: Overdrive not engaging
« Reply #5 on: Jan 25th, 2005, 3:26pm » |
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[/color]A 2.4 Scorpio?[color=Black] Is this just a typo?
eddie
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ren
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95 N 2.9 24v Cossie Estate
Posts: 480
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Re: Overdrive not engaging
« Reply #7 on: Jan 25th, 2005, 9:05pm » |
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Vulcan
His is a 2.4 ? yours is a 2.9
my cruise can operate around 30mph
overdrive dont kick in till about 48/49mph
Ren
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ren
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95 N 2.9 24v Cossie Estate
Posts: 480
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Re: Overdrive not engaging
« Reply #8 on: Jan 26th, 2005, 7:32pm » |
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Jim
have u sussed the o/d problem
u had.
Ren
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Jim
Full Member
1996 2.3 115k and rising
Posts: 121
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Re: Overdrive not engaging
« Reply #9 on: Jan 26th, 2005, 10:44pm » |
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Afraid not, still scratching head
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Jim
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desperate
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Re: Overdrive not engaging
« Reply #10 on: Jan 26th, 2005, 10:47pm » |
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Jim,
Have you done one of them OBD thing scans ??
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Jim
Full Member
1996 2.3 115k and rising
Posts: 121
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Re: Overdrive not engaging
« Reply #11 on: Jan 26th, 2005, 10:58pm » |
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Yes, obd in place during a 20 mile run, didn't show any dtc's and all readings showed no obviouse errors. However, I do not understand all the readings that are given. 
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Jim
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ren
Full Member
95 N 2.9 24v Cossie Estate
Posts: 480
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Re: Overdrive not engaging
« Reply #12 on: Jan 27th, 2005, 7:26pm » |
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Jim
as per owners handbook, and as the info on the
main page explains why, type o/d in the search box.
D=Drive (driving with overdrive)
The normal driving posistion,all 4 gears are selected.
D=Drive (driving without overdrive)
The overdrive function can be switched off,by pressing
the locking button on the side of the selector lever,
the corresponding control light in the instrument panel
will illuminate.
the transmission will now select only gears 1 to 3.
Hth
Ren
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Jim
Full Member
1996 2.3 115k and rising
Posts: 121
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Re: Overdrive not engaging
« Reply #13 on: Jan 27th, 2005, 11:09pm » |
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Its getting deeper into the tech stuff. I have been giving the odb readout a good looking at and going through at low readback speed. Checking VSS against RPM and GEAR. odb shows gear change from 3rd to 4th at VSS of 50. No drop in rpm it stays at 2500. It looks like the management system commands the gear change and ideed sees it but the gearbox doesn't actualy change. This is the feeling when you drive, that is no change up and no drop in rev counter. More suggestions please.
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Jim
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ren
Full Member
95 N 2.9 24v Cossie Estate
Posts: 480
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Re: Overdrive not engaging
« Reply #14 on: Jan 28th, 2005, 3:52am » |
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Have you tried turning o/d off just after
starting car so you only have gears 1 to 3
run it up to 65/70 then put o/d on (4th gear)
would think that will give a significant rpm reduction
have you tried it in both economy and sports mode
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scorpio_man
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Ford Kuga awd
Posts: 5654
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Re: Overdrive not engaging
« Reply #15 on: Jan 28th, 2005, 11:36am » |
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hi there
the only other thing i can think off is the Brake On Off(BOO) switch. if this is stuck on, then the torque converter won't engage. i'm not sure what effect this will have or if a code is registered, but it's something else to check.
hth
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waders
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Re: Overdrive not engaging
« Reply #16 on: Jan 28th, 2005, 7:27pm » |
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Jim,
Where are you in our green and pleasent land? Anywhere near Barnet or the M25?
waders.
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Jim
Full Member
1996 2.3 115k and rising
Posts: 121
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Re: Overdrive not engaging
« Reply #17 on: Feb 4th, 2005, 6:59pm » |
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Sorry for the delay but only just got my broadband back, Ntl are a bit like scorpios, briliant whilst it works.
Tried last suggestion no different, live in Dagenham and just seen a posting entitled 'lost 4th gear' sounds similar.
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Jim
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waders
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Re: Overdrive not engaging
« Reply #18 on: Feb 4th, 2005, 7:38pm » |
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I'm less than half hour away (unless it's rush hour  )
Send me a PM if you want to come my way for some OBD 
Barry.
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gaz01gaz
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2.9 cos...what else????
Posts: 205
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Re: Overdrive not engaging
« Reply #19 on: Feb 4th, 2005, 10:29pm » |
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jim, i have all the same symptons? exactly as you describe,unfortunately there does't seem to be any one around me in yorks available to do the fault scan,i am at a dead end,under acceleration i cannot get 4th gear as soon as i lift off or begin coasting it changes as you see the revs drop slightly and if you hit the o/d button you feel it change down and up not sure all this helps you but lets you know your'e not on your own out there!!!!gaz
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go gaz go.............................
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