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Old 08-18-2003, 23:47   #1 (permalink)
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Limp Home Mode?? (HELP!)

Hi all,

I have noticed my car has been playing up a bit lately...
It seems to stick in gear 3, i think it's called Limp Home Mode.
I dont understand why this is happening, the car temperature is fine, water levels are fine and so is the transmission levels.

I can tell when it switches into this mode because my battery gage in my instrument cluster goes to 16 (which is full) and my cars acceleration is very poor. It also seems to be reving high in this state.
It seems to go away after i turn the car on then off again.. It sometimes comes back again though..
It has only started to do this about 2 weeks ago...

Any suggestions would be appreciated..

Thanks

- Ace

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Old 08-19-2003, 00:43   #2 (permalink)
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Re: Limp Home Mode?? (HELP!)

Re charge the battery. Check alternator output.
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Old 08-19-2003, 02:10   #3 (permalink)
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Re: Limp Home Mode?? (HELP!)

After removing the dash in my car it wentt to limp home mode ,there is an relay just up behind the fuse panel check this first
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Old 08-19-2003, 03:48   #4 (permalink)
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Re: Limp Home Mode?? (HELP!)

Sounds like something electrical.....how about the plugs on the side of the box, are they loose/dirty?
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Old 08-19-2003, 11:00   #5 (permalink)
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Re: Limp Home Mode?? (HELP!)

It will go into limp mode if there is intermittant power to the trans. If your battery and alternator checks out OK, check your earth points for tightness or corrosion.

Battery Voltage: If the battery voltage is low, shifts into first are inhibited, but if the battery voltage is high, >16.5V, Limp Home Mode is adopted. Check the alternator output, should be no more than 14.5 volts.

This may be the cause, or it may not. :s6:

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Old 08-20-2003, 06:04   #6 (permalink)
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Re: Limp Home Mode?? (HELP!)

my bet is it would be the voltage regualtor (the black box which is stuck in the back of the alternator).
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Old 08-20-2003, 08:59   #7 (permalink)
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Thanks guys for all your help,

I was just wondering if anyone could tell me in more detail about this regulator behind the alternator.

Does anyone know where I can buy a new one or reconditioned one, and how much it would cost?
I can't remember seeing a black box behind the alternator, if anyone could somehow post me a pic of what it looks like that would be great.

Anywayz thanks again for your suggestions

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Old 08-20-2003, 11:58   #8 (permalink)
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Re: Limp Home Mode?? (HELP!)

Ace,

Before you go replacing parts, test the alternator output first. Just get a multimeter and check the battery voltage while the car is running, should read around 14.5 volts.

The trans will also play up if the battery voltage drops below 9.5. Give your battery and charging circuit a good look over.

This is only one possible cause. Could still be a dodgy earth connection somewhere, or something else entirely. :s6:

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Old 08-22-2003, 05:25   #9 (permalink)
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Re: Limp Home Mode?? (HELP!)

There is also an earth wire between the gearbox and body on the passenger side, I have seen these break before, causing similar problems.
But I suggest you try the voltmeter and cleaning up various terminals before you spend any money.
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Old 08-22-2003, 05:34   #10 (permalink)
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Re: Limp Home Mode?? (HELP!)

I had all sorts of troubles years ago.Replaced alt etc etc.. Fixed by replacing battery as if a cell is low the alt will over charge.It stuffed up my oil sender as well..Thats with a eb1 xrV8...As said above check all connections esp earths...even run another to make sure..
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