Hi fellow jaguar enthusiasts. I have a 1999 S Type with a 4.0 and a miss once warmed up at idle and under load, under 2000rpm. I have no error codes or vacuum leaks. I will be replacing all coils and plugs in a week once they arrive, but there are many posts on possible causes. I have also have an Autoland Scientech scanner with the ability to data stream.


Now to my question. While I know that the sensors are within parameters or an error code would be recorded, what should the sensor voltage outputs be a idle? (I chose at idle as we're looking at a constant load) For example, both my front oxygen sensors range from 0.05V to 0.92V and cycle over this range in a 4 second cycle... is this normal?


Does anyone have a list of sensors with normal voltage outputs?


Thanks for your assistance in advance.
Peter

 

Mods: please move to correct forum!

What are LTFTs per bank, engine hot, at idle & at 2500rpm?

Though if you know you've a miss it's almost certainly bad coil(s)

 

The new coils and spark plugs eliminated the miss. Curiously, there is an error code on the bank 2 LTFT. As my Jag is running near perfect, I've taken photos all the outputs from my scanner. Could it be useful for others to upload them?
Any ideas on the error code?

 

Peter,

I've moved your question from General Tech Help to S-Type forum. Members here with the same model will be able to help.

Graham