Red light will come on my 99 XJ8L. It will not hardly run, it goes into limp mode.I can pull over on side of road, shut off the engine then restart and it will go back to running normal.Sometimes it takes 2 or 3 times of shutting engine off and restarting, then finally runs normal. Does anyone know the cause of this?

 

Welcome to the forum gajagcat,

I've moved your question from Jaguar Forums Feedback & Suggestion Center to X308 forum. Members here with the same model will be able to help.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

Which red light? How about the check engine light? Solid or flashing? Any messages?

You're going to need to be a lot more specific.

 

Sorry, the red light next to amber. It will read engine fail safe.

 

The red light stays on solid

 

You really need to read the stored codes. Just take it to Autozone or other store and ask them to read the codes, then come back here with the actual codes, not their interpretation.

We don't know what year/ model car you have. Use the USER CP at the top of the forum page to include the information in your signature.

If you are within range of Douglasville I can assist.

 

There are three connectors on the throttle body. Denso used gold plating on the male pins and Jaguar used tin plating on the female pins in the plugs that connect to them. There was a service bulletin about changing the tin plated pins to gold plated if customers were reporting problems.


My suggestion is to disconnect each connector and clean with aerosol electrical contact cleaner, particularly the female connector and then add silicone bulb grease to the connector before reconnecting.


What you are describing is also affected by whether it is raining or humid when you have this intermittent problem.


I kept getting Restricted Performance which was resolved by cleaning the existing tin plated female pins and adding the bulb grease. Apparently, the tin and gold end up with higher resistance. The ECM and Throttle body are very sensitive to slight changes in resistance.

 

Thanks everyone for the replies,going to try the contact cleaner. The only dtc i've gotten so far is P1000 on 1999 XJ8L 4.0L and so far it runs good.

 

Code P1000 in NOT and error code - it's a status.

You will always have either:

P1000 - OnBoard Monitoring tests not completed since last memory clear
OR
P1111 - OnBoard Monitoring complete

Graham