After 20 years of TLC and high maintenance (sounds like my wife) the limp home light will occasionally come on (three times this year) on my 90 Sov (167K) and it will go into linp home mode. Then the light goes out and all is OK again. Is this the beginning of the end of a beautiful relationship (ie. new transmission) or should I be looking for something related and less expensive?

stay safe

 

My guess would be the rotary switch on the driver's side of the transmission.

 

Ken, appreciate the quick response. Questions.
1. My shop manual says you can adjust and/or renew rotary switch. Are you suggesting renew?

2. Both adjust and renew call for use of tool #JD161. Is use of this tool critical and if so is it available to purchase.

3. This condition has only occured three times this year to date. Am I doing any harm in leaving it "as is" for a while. I'm in the middle of rebuilding a house.

stay safe

 

Throttle potentiometer

 

I just did a TP on a 91 XJ40 today! Ahhhh, memories. So many memories. I even used PDU!!!

 

Yo man, where you been hiding?

 

Here and there, my friend. Sometimes I ain't got no time........so I don't come over. I'm still alive, thankfully. I said Hi to you in another thread about an '88 with a bum trans.

 

I don't know if anyone uses the tool, or ever did. I would first try just to adjust. Now a slight adjustment on this is huge. I personally would wait until the light becomes more regular. Wait to hear more from the techs, but this is my guess.

 

I wouldn't mess with the rotary switch just yet. I'd do the TP first since it's a more common problem with these cars.

 

Thank you all for the input. Will let it ride for the time being as per your advice and see what develops. Will also do the TP.

stay safe