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Rough idle / Missfire / No power.


L600MAT
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Hi all new here.

I wanted a project car and the wife picked me up an S Type 3.0SE 1999 auto at Christmas. I was hoping you all could give me any ideas.

The car feels like it has a missfire when idling and when I took it for a quick blast up the road it barely got above 45 and over 3k. So I'm assuming this is an engine safe mode.

I am not getting any warning lights.

The battery was dead when it arrived.

And going by the last mot it came off the road in July.

I have brought a code reader which should arrive soon but do not know if any codes will be stored.

Thanks in advance.

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Welcome to the Club, Matthew.

 

A good battery of the correct size is essential for Jaguars, as there are a lot of electrical bits that need power.  On the Jaguar, you will find that if a battery is failing and not holding a charge the less essential functions of the car close down, and I guess that warning lights are amongst those.

 

When you gave the car a run you were definitely in limp home mode, and an OBD2 reader should tell you why.

 

Let us know how you get on. The s type is a great car and the 3 litre petrol engine is a unit well used by Jaguar.

 

Regards,

 

Peter.

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The battery seems ok and the history suggests it was fitted at the end of 2013. I had it on a trickel charger for over 24hr. When I jump started the car before nothing electrical wanted to work but all is ok now.

Another quick question do the a-pillers pop off easily as the material needs redoing.

Will update with codes if any when it's plugged in.

Thanks for the quick response.

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Hi Peter

I got my coder reader but cannot locate the socket, I have read on the forums here that it should be on the drivers side down with the pedals. But the is no socket that will fit the cable I have.

I brought the D900 reader on eBay and it works nicely on my Citroën.

Does the S Type have a different connector? or is the OBD located else where? 1999 S Type V6SE

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Hi Matthew,

 

The socket is on the drivers side about knee high at the left side of the footwell.  Once you have found it, you will never forget it. My s type is the 2007 D, but I don't think they would have changed the location.

 

If Stan reads this, he will be able to confirm this or otherwise.

 

Peter.

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Update I plugged it in and it cannot read the S Type going to send it in for an MOT see what else it might need and get it on the diagnostics when it's there.

Another question a little of topic because S Type is sat around after few days the battery goes flat again would it be worth buying a Ring RSP150 that trickel charges using solar power.

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Hi Matthew

 

I agree with Peter a new battery might well be the answer. :unsure: :unsure: :)

 

If not something's on and running it down a trickel charger will add to your problem .??

 

Find out why it keeps going flat first .???

 

A good battery will perhaps cure all your problems because all sorts happens to a Jaguar with a dodgy battery.

 

Frank

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