as I had suspected..... it was too cold driving up to thunderhill in the early morning.... hmmm flaw in the system if it cant keep things warm enough to not trigger a code. I guess I need to use my old race car to the track, trick, of putting a towel in the air inlet air duct at the nose...... just have to remember to pull it out when it gets warm outside!


Code: P0128 thermostat seeing undertemperature. (or something like that)

 

yes, I was instructing out there. Thunderhill -West! I took my students for a few rides... great for me too, as I hadn't been there and have limited track time in the Aston. a lot of fun.


Feel free to ping me....more than happy to chat!


ill see if I can get the crummy video I took with one of the original Go-pros , on to youtube.

 

Thermostat failure seems fairly common. See pistonheads faq for the Jag alternative part # to save a few $.

 

There's also a thread on 6Speed:
https://www.6speedonline.com/forums/...hermostat.html

 

thanks guys! appreciate the response and help! Glad its not a big fix and fairly common. what about the towel in the inlet technique.

 

Awesome, thanks

I just ordered the Jag thermostat. Mine is probably the original. It will intermittently stay at about the 1/3 point on the gauge, but most of the time it's at the 1/2 point. Might as well change it out as part of my winter refresh!

 

 

Thermostat hardware of Jag V8 is the same with one exception. Their spring is significantly stronger, so sayeth my tech who works on both brands.

The only time you will notice how strong the spring is, if you are a do it yourselfer, is when you are building up the assembly in the engine compartment, while leaning over fender, reaching waaay down.

Bring your big boy fingers. It is doable, but it certainly doesn't fall into place.