S-Type Auxiliary Pre heater - Jaguar 2.7 Diesel

[Steve]

First time i have personally experienced a Auxiliary heater working on my new S-Type. I can understand how people think there Jag is about to catch on fire. I learnt the hard way too.

 

Yesterday I checked it out as curious how it works and to make sure it was the Auxiliary heater that causing the smoke.

 

The Auxiliary heater still comes on even if the car was almost at running temprature. The temparture was 1 outside and whilst sitting at traffic lights i noticed the smoke from the heater, when pulling away I noticed it left quite a bit of smoke.

 

The Engine light came on ( a clench ass moment) I had 15 miles left of range so the car needed fuel. I stopped to get fuel and noticed the engine light was still on afterwards. No smoke at all.

 

When i got home the car sounded good, no smoke from exhausts at all.

 

I turned the engine off for 5 mins, had a cuppa and then started the car again, got underneath and could see the Auxiliary heater working as normal. The engine light had gone out.

 

Question is, I read that when the car gets low on fuel the Auxiliary heater has air ingress due to the offtake for the heater fuel line sits higher on the fuel tank than the lines for the engine.

 

Does anyone know if this would cause the engine management light to show?

 

 

Also, anyone else have any Auxilary heater stories?

[Jagfix]

The auxiliary heater does not work if the fuel level is low. If the low fuel warning indicstor is on the dash, the control module inhibits the auxiliary heater.

The pick up for the heater is sat just as low as the main pick up.

The quickest and easiest way to stop the smoke is to remove the fuse for the auxiliary heater control module. It is in the engine bay fuse box. 3rd fuse from the right, top row. 20 amp. Remove this and no more smoke. This has no affect to the engine.

The eml coming on will not of been related to the auxiliary heater. Maybe just pulled a little air in if fuel level was very low.

[Steve]

thanks for the response, yeah i have not had the eml since and i have done some long runs since.. i try and now top up as soon as the light comes on.