Unsolvable impossible to find Lean codes fixed P0171 P0174 Fixed
#1
Unsolvable impossible to find Lean codes fixed P0171 P0174 Fixed
So a customer came in with lean codes that an independent highly regarded Jaguar specialist could not solve. High long term fuel trims
P0171 and P0174 plus occasional Maf codes. The shop tried a set of aftermarket Denso compatible MAF units first, after that didn't work they tried OEM from Jaguar dealer MAF sensors, those did not seem to work either. Customer asked me for advice. After running diagnostics on his vehicle I told him that mass airflow sensors are very highly suspect, and told him to go back to the Jaguar specialist to double check everything. So one more time they tackled the problem and managed somewhat to mask it by installing non supercharged MAF units. I checked the vehicle over again, and suspicion I decided to take a look at what's going on. This is what I found,,, lol for anyone that's familiar with this picture, this highly regarded independent Jaguar specialist managed to install airflow director screen backwards, not just once but three times with MAF replacements .. WTF ,😂. Customer was also told that his air filters look brand new 😂. Look at the photo
Fixed the screen installation put new air filters and all issues resolved. . Customer
is ecstatic 3 months long saga is over, especially after loading the long-awaited ECU tune.
P0171 and P0174 plus occasional Maf codes. The shop tried a set of aftermarket Denso compatible MAF units first, after that didn't work they tried OEM from Jaguar dealer MAF sensors, those did not seem to work either. Customer asked me for advice. After running diagnostics on his vehicle I told him that mass airflow sensors are very highly suspect, and told him to go back to the Jaguar specialist to double check everything. So one more time they tackled the problem and managed somewhat to mask it by installing non supercharged MAF units. I checked the vehicle over again, and suspicion I decided to take a look at what's going on. This is what I found,,, lol for anyone that's familiar with this picture, this highly regarded independent Jaguar specialist managed to install airflow director screen backwards, not just once but three times with MAF replacements .. WTF ,😂. Customer was also told that his air filters look brand new 😂. Look at the photo
Fixed the screen installation put new air filters and all issues resolved. . Customer
is ecstatic 3 months long saga is over, especially after loading the long-awaited ECU tune.
__________________
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
Last edited by AlexJag; 05-27-2020 at 02:23 AM.
#2
#3
There is no way to install them incorrectly if you follow the groves and match the slots . They won't be perfectly centered but they will be where they are soposed to be for correct MAF reading
__________________
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
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guy (05-28-2020)
#4
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Love the quote 'Highly regarded Jaguar Specialist'. Wrong MAFs?? Installed backwards?? and those filters!!... Jeepers.
Related: A friend once had all kinds of issues as the MAFs were covered in filter oil... done at a speedshop.
Fixed in my driveway. After I made him clean his air feed system (with dish detergent, rinsed in vinegar water) he convinced himself to go back to paper filters.
So tell me, how much money and time did they save by not just going to the proper service department in the first place. Or is this customer's time not worth money?
Thanks for sharing @AlexJag !
Related: A friend once had all kinds of issues as the MAFs were covered in filter oil... done at a speedshop.
Fixed in my driveway. After I made him clean his air feed system (with dish detergent, rinsed in vinegar water) he convinced himself to go back to paper filters.
So tell me, how much money and time did they save by not just going to the proper service department in the first place. Or is this customer's time not worth money?
Thanks for sharing @AlexJag !
The following users liked this post:
ralphwg (05-28-2020)
#6
Love the quote 'Highly regarded Jaguar Specialist'. Wrong MAFs?? Installed backwards?? and those filters!!... Jeepers.
Related: A friend once had all kinds of issues as the MAFs were covered in filter oil... done at a speedshop.
Fixed in my driveway. After I made him clean his air feed system (with dish detergent, rinsed in vinegar water) he convinced himself to go back to paper filters.
So tell me, how much money and time did they save by not just going to the proper service department in the first place. Or is this customer's time not worth money?
Thanks for sharing @AlexJag !
Related: A friend once had all kinds of issues as the MAFs were covered in filter oil... done at a speedshop.
Fixed in my driveway. After I made him clean his air feed system (with dish detergent, rinsed in vinegar water) he convinced himself to go back to paper filters.
So tell me, how much money and time did they save by not just going to the proper service department in the first place. Or is this customer's time not worth money?
Thanks for sharing @AlexJag !
As far as the customer going to the right place , I can't really blame him as the shop was highly regarded until this. I think Jaguar dealer would have been a lot more responsible or at least I would hope so.
__________________
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
The following users liked this post:
Don B (05-30-2020)
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