Replaced the MAF Sensor, tune-up, ignition coils 3, 4 and 5, cleaned injectors. This was complete by a certified Maintenance Tech two weeks earlier after my car went into performance mode and the engine light came on.
Hi Antonio ,
What is the real problem ? are you getting RPM needle fluctuation while driving or the the engine light that came up after that minor engine service ?
As I understand you are having fluctuating RPM after that minor engine tune up. If there is no sound than it could be a problem of throttle body.
I did a scan when the engine light came on and P0121, Bank 1 system Too Lean was present. We cleaned the throttle body, sensors, contacts and checked all harnesses and wires. The car runs better but the RPM fluctuations, hesitation and torque noise continues.
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You need to run a scanner and pull the fault codes off it. You need to double check the correct parts have been fitted. were any of the parts pattern? They may not necessarily be bad but with the coil packs if they have different characteristics to the O/E that can affect the running. Start with the simple stuff, check all connections, wires and earths. Look for chaffing or broken wires inside. If its the 4.2 engine then the throttle body issue was long solved. 90% of the time its not the components but wiring/earthing issues.
Testimonial: "I did a scan when the engine light came on and P0121, Bank 1 system Too Lean was present. We cleaned the throttle body, sensors, contacts and checked all harnesses and wires. The car runs better but the RPM fluctuations, hesitation and torque noise continues."
I presume your car is a old xj8 and not the xj350 version. what fault codes were logged when the engine light came on and i guess restricted performance was displayed on the instrument pack to make you have the mass air flow sensor and ign. coils replaced ? these cars had problems with the throttle bodies but the year of your car i would have thought it be past these issues. we renewed throttle bodies from just after this car was put on the market under a recall action but this was a problem related to the throttle butterfly sticking shut on overun a problem i recall with the throttle motor so i do not think it is your problem let me have the original fault codes and will try and help,
"I did a scan when the engine light came on and P0121, Bank 1 system Too Lean was present.
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SOURCE: Jaguar 1995 XJ6 idle doesn't hold
I had this problem with my wifes car. I went through the car top to toe and found more than one problem causing this intermittant issue.
I found a weak crank sensor, when warm it was intermittantly losing a signal, replaced it and the problem was a little better, I then found that the throttle position sensor was also intermittantly not within the range it should be, replaced it and it helped, I then was getting the oxygen sensor code and that was only due to the car stalling, nothing to do with the o2's, I finally traced the final issue to the integral harness on the valve body inside the transmission, I replaced that harness and fitted a new transmission speed sensor and the car has been perfect.
I know you have several issues here that could be your problem but you now have a base to start from.
Last thing is the car may just need an engine set-up if you are no longer having any codes. This is only done by the dealer using there WDS computer system. The perform a oxygen sensor orientation test, they set-up the kick down and also set-up the Throttle positon sensor (TPS).
Hope this helps.
JPTCAT
SOURCE: 2000 S-type Fail Safe Engine mode is intermittent.
change the throttle body posistion sensor and change the plugs if the throttle body was dirty the plugs can now be fouled out causing the problem the 02 sensor may be clogged as well from the cleaning try thid first this should work if not let me know ill tell you what else you can do hope this solves your problem.
SOURCE: check engine light is on,display says restricted performance
Anything can cause the check engine light to go on from a loose gas cap, to a transmission issue. When the onboard computer detects an issue, it will restrict performance so as to not damage the engine any further. An Oil change won't affect this light. The only way to determine the cause of the light is to have the computer scanned with an OBD-II tool (Autozone does this for free) to determine the codes and cause for the light. You can also clear the light with the OBD-II tool, but if the problem is still there, the light will just come back on
SOURCE: jaguar s-type restricted performance
I had the same problem. Restricted performance and running rough at 3000 RPM. I have an OBDII code reader and found that the problem was in the air mass flow sensor, which is just after the air filter. I pulled this out and found it was dirty and had butterfly wings in it. The last shop where I had the oil changed replaced the filter for me but put in the wrong size. Close but no cigar. Bought some *** Flow Sensor cleaner at auto store and fixed the problem. Get an OBDII reader with the ability to erase the codes. Comes in real handy.
SOURCE: Jaguar x type 2004 2.5 petrol V6, 38500 miles, codes P0171, P0174
Have exactly the same issue on 04 jag x type 2.5. So far have replaced fuel filter, air filter k&n, plugs ngk. Codes cleared, same issue. Seems to appear when air temp is cold and eng is warm.
Am replacing upstream O2 sensors and cleaning MAF next. Will keep you posted if it clears up. Did you ever find the cause?
OBDII DTC
P1001 Key on engine running unable to complete; key on engine running aborted
P1100 Mass air flow sensor intermittent
P1101 Mass air flow sensor out of self test range
P1104 Mass Airflow (MAF) Sensor Ground Circuit Malfunction
P1107 Left MAP Sensor Circuit
P1108 Right MAP Sensor Circuit
P1112 IATS Circuit High Voltage
P1113 IATS Circuit Low Voltage
P1121 Pedal Position Sensor Circuit A Range/Performance
P1122 Pedal Position Sensor Circuit A Low Voltage
P1123 Pedal Position Sensor Circuit A High Voltage
P1137 No Rear HO2S Response
P1138 No Rear HO3S Response
P1157 No Rear HO2S Response
P1158 No Rear HO3S Response
P1171 All Cylinders Too Lean
P1172 All Cylinders Too Rich
P1176 Adaptive Fuel Metering Trim Too Lean
P1177 Adaptive Fuel Metering Trim Too Rich
P1178 Adaptive Fuel Metering Trim Too Lean
P1179 Adaptive Fuel Metering Trim Too Rich
P1187 Both Front HO2S Heater Circuits (High Resistance)
P1188 Both Front HO2S Heater Circuits (Open Short to Ground High Resistance)
P1190 Both Front HO2S Heater Circuits (High Battery Voltage Short to Voltage)
P1193 Both Front HO2S Heater Circuits (High Resistance MAF Sensor Fault)
P1194 Both Front HO2S Heater Circuits (Open Short to Ground High Resistance)
P1196 Both Front HO2S Heater Circuits (High Battery Voltage Short to Ground)
P1198 Fuel Level Sensor (High Voltage)
P1199 Fuel Level Sensor (Low Voltage)
P1201 No. 1 Fuel Injector
P1202 No. 2 Fuel Injector
P1203 No. 3 Fuel Injector
P1204 No. 4 Fuel Injector
P1205 No. 5 Fuel Injector
P1206 No. 6 Fuel Injector
P1221 Pedal Position Sensor Circuit B Range/Performance
P1222 Pedal Position Sensor Circuit B Low Voltage
P1223 Pedal Position Sensor Circuit B High Voltage
P1224 Electronic Throttle Control Position Error
P1226 Mechanical Guard Circuit Range Performance
P1227 Mechanical Guard Circuit Low Input
P1228 Mechanical Guard Circuit High Input
P1229 Throttle Control Circuit Malfunction
P1230 Fuel Pump Relay Malfunction
P1235 VSV 1 Circuit Range/Performance
P1236 VSV 1 Vacuum Circuit Failure
P1237 VSV 2 Atmosphere Circuit Failure
P1238 VSV 3 Release Circuit Failure
P1240 Throttle Position Sensor Voltage Malfunction//Sensor Reference Voltage Low (Throttle
Fuel Tank Pressure)
P1241 Throttle Position Sensor Voltage Low Input//Reference Voltage Low (Throttle Fuel
Tank Pressure)
P1242 Throttle Position Sensor Voltage High Input
P1243 Throttle Position Sensor Ground Malfunction
P1245 Crank Signal Low Input
P1246 Crank Signal High Input
P1313 Misfire Catalyst Damage Bank No. 1
P1314 Misfire Catalyst Damage Bank No. 2
P1315 Misfire Excess Emissions
P1316 Misfire Rate Above Limit
P1335 Crankshaft Position Sensor Circuit
P1336 Camshaft Position Sensor (CMP) Circuit Performance
P1361 Ignition Coil Primary Circuit (Cylinder No. 1)
P1362 Ignition Coil Primary Circuit (Cylinder No. 2)
P1363 Ignition Coil Primary Circuit (Cylinder No. 3)
P1364 Ignition Coil Primary Circuit (Cylinder No. 4)
P1365 Ignition Coil Primary Circuit (Cylinder No. 5)
P1366 Ignition Coil Primary Circuit (Cylinder No. 6)
P1367 Ignition Monitor (Bank A)//Ignition System Failure Group 1
P1368 Ignition Monitor (Bank B)//Ignition System Failure Group 2
P1371 Early Activation Ignition Coil (Cylinder No. 1)
P1372 Early Activation Ignition Coil (Cylinder No. 2)
P1373 Early Activation Ignition Coil (Cylinder No. 3)
P1374 Early Activation Ignition Coil (Cylinder No. 4)
P1375 Early Activation Ignition Coil (Cylinder No. 5)
P1376 Early Activation Ignition Coil (Cylinder No. 6)
P1392 Variable Valve Timing Solenoid A Low Input
P1393 Variable Valve Timing Solenoid A High Input
P1396 Variable Valve Timing Solenoid B Malfunction
P1397 Variable Valve Timing Solenoid B Low Input
P1398 Variable Valve Timing Solenoid B High Input
P1400 EGR Valve Position Circuit (Valve Sticking Open or Short)
P1401 EGR Valve Position Circuit (Open Short to Ground)
P1408 EGR Temperature Sensor Circuit
P1409 EGR Valve Circuit
P1440 EVAP Purge Valve Open
P1441 EVAP Valve Circuit
P1443 EVAP Valve Circuit
P1447 EVAP Valve Circuit
P1448 EVAP Valve Circuit
P1454 EVAP System
P1474 Charge Air Coolant Pump Relay
P1475 Radiator Fans Slow Malfunction
P1476 Radiator Fans Fast Parallel Circuit Malfunction
P1506 Idle Speed Control Circuit (Low RPM; Bank B)
P1507 Idle Speed Control Circuit (High RPM; Bank B)
P1508 Idle Speed Control Circuit
P1509 Idle Speed Control Circuit
P1512 Throttle Position Sensor Idle Switch Sense Circuit
P1513 Throttle Position Sensor Idle Switch Sense Circuit
P1514 Park/Neutral Position Switch High Load Neutral/Drive
P1516 Gear Change Park/Neutral Malfunction
P1517 Engine Cranking Park/Neutral Malfunction
P1607 MIL Output Circuit
P1608 Automatic Transmission
P1609 Internal ECM Error
P1641 Fuel Pump Relay No. 1
P1646 Fuel Pump Relay No. 2
P1739 Automatic Transmission
P1775 Transmission Control Module MIL Circuit
P1776 Torque Reduction Request Signal
P1777 Torque Reduction Circuit
P1780 Automatic Transmission
P1781 Automatic Transmission
P1782 Automatic Transmission
P1783 Automatic Transmission
P1785 Automatic Transmission
P1790 Automatic Transmission
P1791 Automatic Transmission
P1792 Automatic Transmission
P1794 Automatic Transmission
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