Intermmitent Engine Fault light
#1
Intermmitent Engine Fault light
Hi All, I have read a lot about the dreaded engine fault light and poor performance in the last week. My 1997 xk8 starts fine runs well and is lively. After about 15minutes when i back off the throttle the engine fault amber light comes on and goes off when i accelerate. It doesnt appear to trow a dcm code. If I drive for a while the red poor performance comes on and sometimes the car surges slightly. In this state I pulled codes P1226 once and P1227 once. A hard reset clears them. If I leave it for a few hours hey presto as if by magic all gone, then after 15 minutes or so of driving back it comes.
Throttle body or ECM? also at standstill i sometimes get stability control fail whilst i am not moving.
Thanks for any advice
kev
Throttle body or ECM? also at standstill i sometimes get stability control fail whilst i am not moving.
Thanks for any advice
kev
#2
Start with checking the battery and alternator output. The battery should read in the 12.5v area or higher after sitting overnight. Even better if you can have it load tested. A lot of strange codes and warnings are the result of a weak battery.
If it checks out okay go through all the v+ and ground connections to be sure they are clean and tight.
If it checks out okay go through all the v+ and ground connections to be sure they are clean and tight.
#3
Start with checking the battery and alternator output. The battery should read in the 12.5v area or higher after sitting overnight. Even better if you can have it load tested. A lot of strange codes and warnings are the result of a weak battery.
If it checks out okay go through all the v+ and ground connections to be sure they are clean and tight.
If it checks out okay go through all the v+ and ground connections to be sure they are clean and tight.
#4
I had a 97 for a bit. It has all the various fault codes come and go, would not run right, lost of power. various faults on ABS and other things. 97 was known for EMC issues so I sent mine out to be checked, rebuilt and when I put it in all the issues went away and 4 or so years down the line the current owner has had no issues.
Provided you have a good battery which I see can cause issue if it is about dead, and you start seeing all kinds of various fault codes that logically should not all start happening around the same time I would look hard at a ECU rebuild. I think this was an issue for 97 and 98 models???
Provided you have a good battery which I see can cause issue if it is about dead, and you start seeing all kinds of various fault codes that logically should not all start happening around the same time I would look hard at a ECU rebuild. I think this was an issue for 97 and 98 models???
#5
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BrentGardner
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04-17-2024 05:19 PM
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