intermittent hesitation and surging - XKR with AJ27 engine
#1
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hi all - I have been scouring the forums for anyone who is having an issue similar to mine. I have read all the surging etc threads.
here is my scenario:
1. RPM varies about 100-200 RPM at low RPM in traffic or at a stoplight.
2. it mostly happens when the fuel tank is at about 7/8 of a tank or 75 miles used from full.
3. it generally happens after driving about 25-30 miles to work. letting the car sit for a an hour or two and then driving again. About 10 miles into the second drive (usually on my way home from work in traffic) is when it happens. Car is always warmed up and at operating temperature.
I have not inspected the vapor canister, however I do not smell any gas as most of the posts suggest.
I am wondering if there is something else in the fuel system (valve, vent etc) that is plugged or is not opening etc under this 7/8 tank condition.
I got this car from a guy in my car club who had a stroke. I can't get a lot of information about the car. its my understanding the motor in it was replaced about 15,000 miles ago. total mileage 135K
I am wonder if there is a service bulletin for the AJ27 motor like this one for the AJ 26 "Hesitation, Surging, Detonation, Poor Throttle Response/Acceleration –Diagnostic Flowcharts – AJ 26 Engines TSB 303-47"
here is my scenario:
1. RPM varies about 100-200 RPM at low RPM in traffic or at a stoplight.
2. it mostly happens when the fuel tank is at about 7/8 of a tank or 75 miles used from full.
3. it generally happens after driving about 25-30 miles to work. letting the car sit for a an hour or two and then driving again. About 10 miles into the second drive (usually on my way home from work in traffic) is when it happens. Car is always warmed up and at operating temperature.
- doesn't matter if a/c is on or off
- surging lasts for about 2-3 miles, or if I can get it up on the RPM.
- I have had it happen in both in traffic and in town
- I have had it surge when in park so I am suspect about going down the path of the torque converter.
- coil packs and spark plugs are about 1500 miles since being replaced.
- there are no DTC codes pending or stored
- once the surge happens, it won't happen again until I fill the tank again. it does not happen, at least yet, with a partial re-fill
I have not inspected the vapor canister, however I do not smell any gas as most of the posts suggest.
I am wondering if there is something else in the fuel system (valve, vent etc) that is plugged or is not opening etc under this 7/8 tank condition.
I got this car from a guy in my car club who had a stroke. I can't get a lot of information about the car. its my understanding the motor in it was replaced about 15,000 miles ago. total mileage 135K
I am wonder if there is a service bulletin for the AJ27 motor like this one for the AJ 26 "Hesitation, Surging, Detonation, Poor Throttle Response/Acceleration –Diagnostic Flowcharts – AJ 26 Engines TSB 303-47"
#2
![Default](/forum/images/icons/icon1.gif)
hi all - I have been scouring the forums for anyone who is having an issue similar to mine. I have read all the surging etc threads.
here is my scenario:
1. RPM varies about 100-200 RPM at low RPM in traffic or at a stoplight.
2. it mostly happens when the fuel tank is at about 7/8 of a tank or 75 miles used from full.
3. it generally happens after driving about 25-30 miles to work. letting the car sit for a an hour or two and then driving again. About 10 miles into the second drive (usually on my way home from work in traffic) is when it happens. Car is always warmed up and at operating temperature.
I have not inspected the vapor canister, however I do not smell any gas as most of the posts suggest.
I am wondering if there is something else in the fuel system (valve, vent etc) that is plugged or is not opening etc under this 7/8 tank condition.
I got this car from a guy in my car club who had a stroke. I can't get a lot of information about the car. its my understanding the motor in it was replaced about 15,000 miles ago. total mileage 135K
I am wonder if there is a service bulletin for the AJ27 motor like this one for the AJ 26 "Hesitation, Surging, Detonation, Poor Throttle Response/Acceleration –Diagnostic Flowcharts – AJ 26 Engines TSB 303-47"
here is my scenario:
1. RPM varies about 100-200 RPM at low RPM in traffic or at a stoplight.
2. it mostly happens when the fuel tank is at about 7/8 of a tank or 75 miles used from full.
3. it generally happens after driving about 25-30 miles to work. letting the car sit for a an hour or two and then driving again. About 10 miles into the second drive (usually on my way home from work in traffic) is when it happens. Car is always warmed up and at operating temperature.
- doesn't matter if a/c is on or off
- surging lasts for about 2-3 miles, or if I can get it up on the RPM.
- I have had it happen in both in traffic and in town
- I have had it surge when in park so I am suspect about going down the path of the torque converter.
- coil packs and spark plugs are about 1500 miles since being replaced.
- there are no DTC codes pending or stored
- once the surge happens, it won't happen again until I fill the tank again. it does not happen, at least yet, with a partial re-fill
I have not inspected the vapor canister, however I do not smell any gas as most of the posts suggest.
I am wondering if there is something else in the fuel system (valve, vent etc) that is plugged or is not opening etc under this 7/8 tank condition.
I got this car from a guy in my car club who had a stroke. I can't get a lot of information about the car. its my understanding the motor in it was replaced about 15,000 miles ago. total mileage 135K
I am wonder if there is a service bulletin for the AJ27 motor like this one for the AJ 26 "Hesitation, Surging, Detonation, Poor Throttle Response/Acceleration –Diagnostic Flowcharts – AJ 26 Engines TSB 303-47"
#3
#4
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Good luck
#5
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Yes, maybe the primary fuel pump is on its way out and this somehow manifests itself under those condtions. You could check the fuel pressure if you have a gauge and check both pumps are working or even swap the wires for the primary and secondary to see if anything changes.
https://www.jaguarforums.com/forum/x...el-pump-85882/
https://www.jaguarforums.com/forum/x...el-pump-85882/
#7
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#8
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i did recently find out this has been going on for a while with the car
#10
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tiger351w
XK8 / XKR ( X100 )
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05-08-2024 12:30 AM
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