XJR occasional rough idle. Full throttle miss.
#1
XJR occasional rough idle. Full throttle miss.
This is a bit odd. I seem to have a progressively worsening rough idle. However, the roughness disappears when the car is sitting in park. There is also a very intermittent high speed, full throttle stumble.
I've checked and tightened all the intake related bits, and am about to swap plugs. I suppose taking a look at the throttle body for gunk makes sense.
The odd part is the progressively rougher running. That would seem to indicate something wearing, or possible fuel starvation.
Ideas? Experiences?
I've checked and tightened all the intake related bits, and am about to swap plugs. I suppose taking a look at the throttle body for gunk makes sense.
The odd part is the progressively rougher running. That would seem to indicate something wearing, or possible fuel starvation.
Ideas? Experiences?
#2
I would clean the throttle bore and plate; clean the MAF sensor; check the air filter (replace); check the tube from filter to throttle for air/vacuum leaks. Might also clean the EGR and take any slack out of the accelerator cable. Change the fuel filter. If you haven't done so, replace the plugs. If those don't help, start checking the second fuel pump.
It would be useful to know if any OBD II codes are present. Also the year and mileage of the XJR.
It would be useful to know if any OBD II codes are present. Also the year and mileage of the XJR.
#3
#5
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ForTheLoveOfCars (01-24-2024)
#6
This is a bit odd. I seem to have a progressively worsening rough idle. However, the roughness disappears when the car is sitting in park. There is also a very intermittent high speed, full throttle stumble.
I've checked and tightened all the intake related bits, and am about to swap plugs. I suppose taking a look at the throttle body for gunk makes sense.
The odd part is the progressively rougher running. That would seem to indicate something wearing, or possible fuel starvation.
Ideas? Experiences?
I've checked and tightened all the intake related bits, and am about to swap plugs. I suppose taking a look at the throttle body for gunk makes sense.
The odd part is the progressively rougher running. That would seem to indicate something wearing, or possible fuel starvation.
Ideas? Experiences?
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