1999 Jaguar XJ8 Misfire Codes

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MACAROSE
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Hi there. I just got a 1999 Jaguar Van Den Plas that another fellow more or less gave up on because he had trouble resolving the ECM issue. The vehicle is equipped for one type of ECM, an LNE1410-BE503, but was replaced with a BB103 model from the prior owner. The car seems to run without a discernible hitch. However, I have found the same codes come three times now within about 200 miles.

P1384 Engine Misfire (Twice)
P1396 Engine Misfire (Twice)
P1000 Fuel Air Metering Emission Control

I have taken it to a specialty shop that said it had the wrong ECM, but it's been all but impossible to find a suitable replacement. Apparently, I need a BE of the type mentioned above or a BF through BJ. On the flip side though, the folks who run the Jaguar recycling facility in my city say that the car would not even run if the ECM was not compatible and the dealership is in agreement with that statement. However I haven't heard as much of a tick so perhaps it may be a cam timing issue.

In the meantime, I have to say that the XJ8 is by far the most comfortable highway cruiser I've ever experienced. Right now I have a 96 MB Diesel, a 99 Passat 5-speed 1.8T, a 97 A4 Quattro, and the Jag. It's the second one I've had (other one was an XJ6L) and I hope it becomes a long term keeper.

If anyone knows of a good source for the ECM or would offer an alternative possibility for the engine misfires, I am all ears.

Thanks, and all the best in the times to come.
Feb 8, 2006 at 2:57 PM
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STRAILER
  • ✓Experienced Mechanic
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This is a difficult problem to detect because the computer can not sense a malfunction, the vehicles computer system thinks everything is ok. In reality what is happening is the electrical component inside the MAF sensor becomes contaminated by air impurities. These containments imbed themselves to the electrical component that senses the air flow causing the sensor to be slightly off, but not enough to trigger the MIL (malfunction indicator lamp). Replace the MAF sensor with a new. NOTE: (Mass Air Flow MAF sensor or Air Intake Sensor AIS, depending on manufacturer. It does the same thing only with different names). Check that and let me know :D
Feb 9, 2006 at 5:50 AM

Suggested Repair

Replace the mass air flow (MAF) sensor with a new unit. Contamination can make the sensor read slightly off without lighting the malfunction indicator lamp and may contribute to the repeated misfire and fuel-air metering codes.

Conversation Summary

The owner of a 1999 Jaguar XJ8 Van Den Plas reports repeated P1384 and P1396 misfire codes and a P1000 fuel-air metering code over about 200 miles. The car runs well but has a BB103 ECM instead of the expected LNE1410-BE series unit. A specialty shop said the ECM is incorrect, while a recycler and the dealership said an incompatible ECM would keep the car from running. The owner also wondered about cam timing. The expert said a slightly contaminated MAF sensor may not be detected by the computer and recommended replacing it.

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