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Linp mode 

 

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 Post subject: Linp mode
Posted: Tue Jan 03, 2017 4:13 pm 
Fordmods Newbie
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Age: 42

Posts: 3

Joined: 3rd Jan 2017

Ride: 95 DF LTD

Location: Adelaide
SA, Australia

This LTD is doing my head in keeps going into limp mode.The economy light comes on in power mode,and goes out in economy mode then the thermo fans fire up even when engine is not even at normal temperature,when the temp gauge is still at the bottom of normal area and the trans locks in 3rd gear,can't even change manually.I know speed sensor can stuff up but speedo is working fine.Have tried a really good battery,checking all wires etc... was going to try changing trans computer but that wouldn't have anything to do with thermos.The guy said he had to take the thermostat out cause it siezed and didn't put 1 back in,surely that wouldn't make a difference would it?Other than that the only thing I can think is the main ecu.
Any help or suggestions would be greatly appreciated
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 Post subject: Re: Linp mode
Posted: Tue Jan 03, 2017 8:59 pm 
Tyre Shredder
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Posts: 304

Joined: 5th Dec 2009

Location: Perth
WA, Australia

Coolant temp sensor may be faulty,i would fit a new thermostat asap,if your mechanic would send your car out of his workshop with no thermostat fitted id find a decent mechanic.
The limp home mode isn't to do with the motor afaik its an electrical fault in the trans most likely or possibly low oil level,could be a dodgy solenoid,get a diagnostic check done on the motor and box and go from there if any faults come up.
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 Post subject: Re: Linp mode
Posted: Wed Jan 04, 2017 1:46 am 
Fordmods Newbie
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Age: 42

Posts: 3

Joined: 3rd Jan 2017

Ride: 95 DF LTD

Location: Adelaide
SA, Australia

I only bought the car a week ago,his mechanic should be shot.I put a new thermostat in it today and flushed the cooling system then replaced coolant,the trans fluid is at proper level and is not a bad colour and does not smell burnt.I was going to put it up on ramps tomorrow and check sensors/senders on the trans,if not will be going somewhere to get a diagnostic scan done just seems like something electrical because of the way it clicks in and out at random times.When it is not in limp the trans changes perfectly.Is there a relay that has anything to do with trans?
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 Post subject: Re: Linp mode
Posted: Wed Jan 04, 2017 1:51 am 
Fordmods Newbie
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Age: 42

Posts: 3

Joined: 3rd Jan 2017

Ride: 95 DF LTD

Location: Adelaide
SA, Australia

Also if the economy/power switch is stuffing around could that cause it?Or the other thing Iam wondering if it's worth changing trans computer?
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 Post subject: Re: Linp mode
Posted: Wed Jan 04, 2017 5:53 am 
Technical Contributor
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Age: 59

Posts: 6817

Joined: 22nd Jun 2005

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Ride: EF Fairmont

Location: Campbelltown
NSW, Australia

Is it 6 or 8 cyl?
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 Post subject: Re: Linp mode
Posted: Wed Jan 04, 2017 10:58 am 
Technical Contributor
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Age: 52

Posts: 5562

Joined: 14th Jan 2005

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Ride: 96 XH/97 EL

Location: South Coast
NSW, Australia

>>>>>> ** Home » Forums » Fordmods Tech » V8 Workshop **

Usually if the Econ light is on with limp mode and thermos running flat out means the trans is overheating. IIRC though the Econ light is flashing - not 100% sure there.
As you mentioned, check the trans connector plugs. Pulling the fault codes from the TCM (Trans module) wouldn't hurt either. It's near the drivers footrest - there should be some threads on here how to do that.

 

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