P0302 and P1316, engine occasionally idles poorly and "sputters"
#1
P0302 and P1316, engine occasionally idles poorly and "sputters"
I understand it is probably misfiring, but what could be causing it and what could I try to do to fix it? For what its worth, the sputtering comes and goes... sometimes it idles fine, sometimes it begins to sputter. It's a 2003 XJ8.
#2
From the DTC "possible Causes":
Cylinder compression low
Worn camshaft / broken valve spring(s)
Fuel delivery pressure (low / high)
Fuel injector(s) blocked / 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 module primary circuit fault (Cylinder misfire detected DTC also flagged)
Ignition module ground circuit: open circuit, high resistance
Ignition module / coil failure
Using Occam's Razor, I suspect you will find a failing coil or a split coil boot on cylinder #2. Look at the coil and the spark plug, then if you do not see anything obvious, swap this coil with another one, reset the codes and see what happens.
Cylinder compression low
Worn camshaft / broken valve spring(s)
Fuel delivery pressure (low / high)
Fuel injector(s) blocked / 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 module primary circuit fault (Cylinder misfire detected DTC also flagged)
Ignition module ground circuit: open circuit, high resistance
Ignition module / coil failure
Using Occam's Razor, I suspect you will find a failing coil or a split coil boot on cylinder #2. Look at the coil and the spark plug, then if you do not see anything obvious, swap this coil with another one, reset the codes and see what happens.
Last edited by sparkenzap; 07-31-2015 at 03:53 AM.
The following users liked this post:
juliovega914 (08-01-2015)
#4
#5
From the DTC "possible Causes":
Cylinder compression low
Worn camshaft / broken valve spring(s)
Fuel delivery pressure (low / high)
Fuel injector(s) blocked / 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 module primary circuit fault (Cylinder misfire detected DTC also flagged)
Ignition module ground circuit: open circuit, high resistance
Ignition module / coil failure
Using Occam's Razor, I suspect you will find a failing coil or a split coil boot on cylinder #2. Look at the coil and the spark plug, then if you do not see anything obvious, swap this coil with another one, reset the codes and see what happens.
Cylinder compression low
Worn camshaft / broken valve spring(s)
Fuel delivery pressure (low / high)
Fuel injector(s) blocked / 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 module primary circuit fault (Cylinder misfire detected DTC also flagged)
Ignition module ground circuit: open circuit, high resistance
Ignition module / coil failure
Using Occam's Razor, I suspect you will find a failing coil or a split coil boot on cylinder #2. Look at the coil and the spark plug, then if you do not see anything obvious, swap this coil with another one, reset the codes and see what happens.
#6
#7
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