Question about Jaguar XJ8

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2001 Jaguar XJ8, filled up with petrol and engine went from running fine to very lumpy. DTC codes P0301, P0302, P0303, P0304, P1316 and P1111. I think that I can rule out a fuel problem as only 4 cylinders affected - assuming petrol pump feeds all 8. Also think I can rule out plugs and coils as bank of 4 cylinders affected. Is there an injection electronics module which is common to 4 cylinders, if so, where is it located and can it be swopped with the module for the other 4 cylinders? All suggestions welcome. Thanks Allan

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  • Jaguar Master
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I strongly suggest u NOT rule out fuel as the cause I think your reasoning is flawed, poor fuel quality can cause some cylinders to misfire and some not, suggest you purge the tank and refill it and purge all the fuel out of the lines, have 35 years of experience and have seen this many times over the decades, as a professional i see it as very odd this all started after filling the tank, don't U?

Posted on Jun 03, 2010

  • allan_braysh Jun 03, 2010

    The lumpy running was immediate when I started the car and before I moved off - I would have thought that a fuel problem would have taken a little longer to show up as 'good' fuel was still in the pipes. Also it may be a coincidence but there are only DTC codes 301 to 304 and not 305 to 308 and the engine has run approx 5 miles getting home from the petrol station. I was rather hoping that there would be an electical component which controlled cylinders 1 - 4 and a similar component for 5 - 8 but if you think not then I will follow your advice. One final thought, acceleration appears to be OK, just slow running and tickover is lumpy. Many thanks for your prompt reply. Allan

  • allan_braysh Jun 04, 2010

    Update - problem solved - secondary cambelt tensioner broken



    Thanks for your suggestions



    Allan

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I have a 2002 Jaguar X-type. The check engine light came on and it has been acting jumpy/shaky. I recently took it to be diagnosed and the codes I recieved back were P1314, P1316, P1111, and P0302..What do...


All fault codes can be checked out at http://www.bluejag.co.uk but here are the results for some of yours. You can ignor P1111. Looks like a faulty plug or coil pack cylinder 2

Fault Code:- P1314 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire rate catalyst damage -bank 2 NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

Action of ECM:- ECM Default:- Maximum engine speed reduced


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.


Possible Fault:- Cylinder compression low Worn camshaft / broken valve spring(s) Fuel delivery pressure (low / high) Fuel injector(s) restricted / leaking Fuel injector(s) continuously open Fuel contamination Fuel injector circuit fault(s) (Injector DTCs also flagged) Spark plug failure / fouled / incorrect gap ECM to ignition coil primary circuit fault (Cylinder misfire detected DTC also flagged) Ignition coil failure
Fault Code:- P1316 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire excess emission NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.


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Fault Code:-
P0302 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire detected ?€" cylinder 2

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.


Possible Fault:- Refer to P0300 Possible Causes

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1 Answer

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Odd one this to have P1111 as well.

According to my data P1111 is all dtc checks compleated, http://www.bluejag.co.uk however some websites show it as a Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage, I'm fairly sure that the latter is incorrect.

check the basics first plugs, leads, corroded ground connections etc then its a bit of a guessing game


As for the other codes

P0301 = Misfire detected - cylinder 1
P1313 = Misfire rate catalyst damage - bank 1
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Possible causes (as per JTIS):

Cylinder compression low
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Spark plug failure / fouled / incorrect gap
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flagged)
Ignition coil failure

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