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Auto box occasionally losing all drive gearing 

 

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 Post subject: Auto box occasionally losing all drive gearing
Posted: Wed Aug 13, 2014 4:49 pm 
Parts Gopher
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Age: 41

Posts: 56

Joined: 5th Mar 2014

Ride: 1998 EL Fairmont Ghia

Location: Wairarapa
New Zealand

Evening punters,

I have a 1998 EL Fairmont that very occasionally sits in neutral for around 30 seconds.
It's irregular enough to make it hard to pin down the cause but the basic process is

- reverse out of driveway
- shift into drive (fine)
- drive to end of street (20 - 30 metres) and brake
- go to accelerate but gearing doesn't engage
- sit for 20 seconds feeling like a numb nuts, shift gears to 1,2,3 and drive with no effect, then the gearing engages again after about 20 seconds

When it does happen (once a week or so) it always happens within a few minutes of starting up and always after slowing to a stop in drive and then going to accelerate again.
It will happen once and then not again, no matter how badly I treat it. The gearbox shifts absolutely fine otherwise with no noticeable sloppiness or other issues.

Any ideas? something blocking a sensor maybe?

 

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 Post subject: Re: Auto box occasionally losing all drive gearing
Posted: Wed Aug 13, 2014 5:17 pm 
Moderator
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Age: 40

Posts: 2327

Joined: 6th Oct 2005

Ride: 93EB Fairmont / BA Falcon XR6T

Location: Western Sydney
NSW, Australia

Have you checked that the fluid level is correct ?

 

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93 EB II Fairmon8 with 17' EL GT's / Clear indicators / H.I.Ds / Sports exhaust / Lowered 2' / K&N / XR6 ECU.
2004 BA MKI XR6T in Lightning Strike paint / K&N / XR8 bonnet / BF lights and a few tweaks.

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 Post subject: Re: Auto box occasionally losing all drive gearing
Posted: Wed Aug 13, 2014 5:31 pm 
Parts Gopher
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Age: 41

Posts: 56

Joined: 5th Mar 2014

Ride: 1998 EL Fairmont Ghia

Location: Wairarapa
New Zealand

93EB wrote:
Have you checked that the fluid level is correct ?


Good point - that's a forehead slapper! Will pop out tonight and check.

 

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 Post subject: Re: Auto box occasionally losing all drive gearing
Posted: Thu Aug 14, 2014 11:25 am 
Parts Gopher
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Age: 41

Posts: 56

Joined: 5th Mar 2014

Ride: 1998 EL Fairmont Ghia

Location: Wairarapa
New Zealand

Well, I would check - if EL's had a bloody dipstick!

Changing trans fluid sounds like a nightmare (http://www.fordaustraliaforums.com/forum/showthread.php?31608-how-to-service-EL-auto-trasmission-(change-fluid-and-filter)) so I'll open my wallet and let a mechanic take care of this one. 220,000Ks and I bet the trans fluid hasn't been changed in years.

Cheers for the heads up

 

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Cheapie EL Fairmont drag car build thread

Next: DIY shift kit, lowering springs and shocks, new rims, nitrous kit, nitrous purge, line locker

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 Post subject: Re: Auto box occasionally losing all drive gearing
Posted: Wed Aug 20, 2014 5:53 pm 
Parts Gopher
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Age: 41

Posts: 56

Joined: 5th Mar 2014

Ride: 1998 EL Fairmont Ghia

Location: Wairarapa
New Zealand

New filter, gasket and full trans flush. Mechanic said the fluid out of the trans was "like black sludge" and he had no idea how it was even pumping through the filter.

Shifts are now crisp and clean - no sign of the weird gearing loss that was plaguing the car.

 

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Cheapie EL Fairmont drag car build thread

Next: DIY shift kit, lowering springs and shocks, new rims, nitrous kit, nitrous purge, line locker

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