pandlsm
29th April 2022, 04:49 PM
Model L319 - Discovery 4 2013 109K
The dreaded red triangle and Restricted Performance occurred last week after accelerating off a traffic light change. Plugging in the IID tool revealed the following errors:
P006A-00 (27) Manifold absolute pressure - mass or volume air flow correlation,
P00BD-07 (27) Mass or volume air flow A circuit range/performance - Air flow too high - General failure information - mechanical failure,
P1247-00 (27) Turbocharger boost pressure low, and
P0235-94 (27) Turbocharger/supercharger boost sensor A circuit - Component failure - unexpected operation
Researching the fault and possible easy to get to fixes I visually checked for hose and pipe leaks on circuit A, cracks in the manifold (paper test) and throttle body but there was nothing obvious. I then removed the secondary turbo re-circulation valve and shut off valve getting about 1/4 cup of oil from the bottom pipe (the oil drain mod had been done on this model). I cleaned the valves and checked the solenoid and compressor shut off valve were working properly before reinstalling it. The vehicle started ok, no smoke from the exhaust so I cleared all the engine faults.
Testing the vehicle it ran fine on the primary turbo for a few kms but when I drove up steep hill in 2nd gear the second turbo appeared to cut in at 2800rpm but straight away with a jerk the car went into Restricted Performance again. Back home I cleared the faults and checked the vacuum hoses and tested the turbine intake shut off solenoid and charge air solenoid and both appeared to be working. Another short test drive and car coughed and sputtered a bit then went into Restricted Performance again. The faults above were cleared again and I did some live tests on while in the driveway just revving the engine but everything appeared to be ok. So I booked in with a Indie for a check over in a couple of weeks and left the car in the driveway for a couple of days.
This morning I decided to go for another test drive. After checking for faults and finding none I headed out into the suburbs. This time everything worked! I drove around a bit to warm up the engine then hit the big hill in 2nd gear, the second turbo cut in at 2800rpm and the car powered up the hill going up to 3600rpm before reaching the top and having to slow down.
I couldn't believe it so I repeated test 3 times and everything was fine. The IID had no faults and it appeared Restricted Performance had never occurred.
Thinking about the problem led me to consider that the vehicle is largely driven around town and when I do go bush I tend not to rev the vehicle past 2500rpm (timid driver) so the second turbo rarely gets used. I have to assume that a build up of oil in the shut off valve may be a clue and that giving the car a good work out with high revs cleans out the second turbo and gives the solenoids and vacuum system some action.
Any thoughts appreciated.
The dreaded red triangle and Restricted Performance occurred last week after accelerating off a traffic light change. Plugging in the IID tool revealed the following errors:
P006A-00 (27) Manifold absolute pressure - mass or volume air flow correlation,
P00BD-07 (27) Mass or volume air flow A circuit range/performance - Air flow too high - General failure information - mechanical failure,
P1247-00 (27) Turbocharger boost pressure low, and
P0235-94 (27) Turbocharger/supercharger boost sensor A circuit - Component failure - unexpected operation
Researching the fault and possible easy to get to fixes I visually checked for hose and pipe leaks on circuit A, cracks in the manifold (paper test) and throttle body but there was nothing obvious. I then removed the secondary turbo re-circulation valve and shut off valve getting about 1/4 cup of oil from the bottom pipe (the oil drain mod had been done on this model). I cleaned the valves and checked the solenoid and compressor shut off valve were working properly before reinstalling it. The vehicle started ok, no smoke from the exhaust so I cleared all the engine faults.
Testing the vehicle it ran fine on the primary turbo for a few kms but when I drove up steep hill in 2nd gear the second turbo appeared to cut in at 2800rpm but straight away with a jerk the car went into Restricted Performance again. Back home I cleared the faults and checked the vacuum hoses and tested the turbine intake shut off solenoid and charge air solenoid and both appeared to be working. Another short test drive and car coughed and sputtered a bit then went into Restricted Performance again. The faults above were cleared again and I did some live tests on while in the driveway just revving the engine but everything appeared to be ok. So I booked in with a Indie for a check over in a couple of weeks and left the car in the driveway for a couple of days.
This morning I decided to go for another test drive. After checking for faults and finding none I headed out into the suburbs. This time everything worked! I drove around a bit to warm up the engine then hit the big hill in 2nd gear, the second turbo cut in at 2800rpm and the car powered up the hill going up to 3600rpm before reaching the top and having to slow down.
I couldn't believe it so I repeated test 3 times and everything was fine. The IID had no faults and it appeared Restricted Performance had never occurred.
Thinking about the problem led me to consider that the vehicle is largely driven around town and when I do go bush I tend not to rev the vehicle past 2500rpm (timid driver) so the second turbo rarely gets used. I have to assume that a build up of oil in the shut off valve may be a clue and that giving the car a good work out with high revs cleans out the second turbo and gives the solenoids and vacuum system some action.
Any thoughts appreciated.