XJR need help
#1
XJR need help
I have a 1998 XJR with excellent condition. Last time it suddenly died on me. When I checked the fuel pressure there was none. The fuel pressure regulator was good, so I removed the relay for the first pump and cranked the engine, to my surprise it worked with the second fuel pump. However the check engine light came on with p1230, Fuel pump relay malfunction code. I have verified that all relays work fine. my question's should I buy a new pump?
thx
thx
#3
on the XJR the fuel pumps work as follow:
When ignition is turned on, pump #2 is energized for about 2 seconds ( to built up fuel pressure)
When engine is cranked, pump #1 is energized ans stay on with engine running
Above a certain rpms/load, pump # 2 is turned on.
If the electrical circuit ( fuse, relay, pump) to pump # 1 is bad, the ECM turn pump #2 on and issue a fault code
Some notes:
If the car take more than 1/2 second to start, pump # 2 is not working correctly
If car feel slugish above 4000rpms or ping under WOT, pump # 2 is not working correctly
Changing only 1 pump is a big mistake, since the labor cost is the same for 1 or 2 pumps.
Often time the electrical harness to the pumps need to be changed due to overheating
When ignition is turned on, pump #2 is energized for about 2 seconds ( to built up fuel pressure)
When engine is cranked, pump #1 is energized ans stay on with engine running
Above a certain rpms/load, pump # 2 is turned on.
If the electrical circuit ( fuse, relay, pump) to pump # 1 is bad, the ECM turn pump #2 on and issue a fault code
Some notes:
If the car take more than 1/2 second to start, pump # 2 is not working correctly
If car feel slugish above 4000rpms or ping under WOT, pump # 2 is not working correctly
Changing only 1 pump is a big mistake, since the labor cost is the same for 1 or 2 pumps.
Often time the electrical harness to the pumps need to be changed due to overheating
#4
I have a 1998 XJR with excellent condition. Last time it suddenly died on me. When I checked the fuel pressure there was none. The fuel pressure regulator was good, so I removed the relay for the first pump and cranked the engine, to my surprise it worked with the second fuel pump. However the check engine light came on with p1230, Fuel pump relay malfunction code. I have verified that all relays work fine. my question's should I buy a new pump?
thx
thx
https://www.jaguarforums.com/forum/s...949#post163949
You're probably looking at a bad pump, but theoretically, it could be the relay, the pump, or the wiring.
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amha07 (02-21-2011)
#6
This might help if you see a need to replace the pumps http://www.gusglikas.com/images/Auto...eplacement.pdf It is for one pump but access is the same. The procedure is for xk but should help on the xj
Last edited by Gus; 02-11-2011 at 08:46 PM.
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amha07 (02-21-2011)
#7
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#8
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One thing I would buy is the plastic collar tools for disconnecting the fuel lines because your not going to get very far without them.
http://www.amazon.com/Lisle-37000-Co...sr=1-3-catcorr
It's a tank out job.
Disconnect the loom from the top of the tank.
Once you release the fuel lines from underneath, you'll need to pull the carpet, and undo the retaining bolts low down for the metal straps. Tie the straps out of the way, and pull the filler neck seal (expanding ring inside the filler that goes round the top of the filler neck).
You can then rock and role the tank out. It's a lot easier if there's little to no fuel in it. To get to the pumps you'll need a big screwdriver and soft head mallet to tap the retaining ring round and off. Pumps are at the bottom of the tank.
Hope this helps, and good luck
http://www.amazon.com/Lisle-37000-Co...sr=1-3-catcorr
It's a tank out job.
Disconnect the loom from the top of the tank.
Once you release the fuel lines from underneath, you'll need to pull the carpet, and undo the retaining bolts low down for the metal straps. Tie the straps out of the way, and pull the filler neck seal (expanding ring inside the filler that goes round the top of the filler neck).
You can then rock and role the tank out. It's a lot easier if there's little to no fuel in it. To get to the pumps you'll need a big screwdriver and soft head mallet to tap the retaining ring round and off. Pumps are at the bottom of the tank.
Hope this helps, and good luck
The following users liked this post:
amha07 (02-21-2011)
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