XK8 2005 Restricted Performance
#1
10-18-2024 | 09:54 AM
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Junior Member
Joined: Jun 2014
Posts: 7
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From: Eastbourne Sussex UK
XK8 2005 Restricted Performance
2005 XK8 60,000 miles in good order but - - - - -
Dash Engine light has been on for several months and simple DIY computer reports DTC P0171 System Too Lean Bank 1
Proper Jaguar garage computer apparently reports both banks running lean.
More recently accelerating quickly or going uphill results in Restricted Performance dash light with obvious restrictions.
The engine light now stays on permanently but the Restricted Performance light clears by itself if I slow down and doesn't require the car to be restated to clear it.
Generally at Restricted Performance light doesn't come on if driving at <50 mph although it will cruise on the flat at 70 mph without Restricted Performance just as long as I take my time to accelerate up to 70 mph slowly.
Otherwise the engine is running sweetly and the car goes fine without any misfires etc.
So basically the problems occur when the engine is powering under load.
Lambda sensors seem OK.
Petrol filter replaced but doesn't help.
Several engine air leaks sealed but still no joy and symptoms persist.
Jaguar Garage mystified.
Any ideas please would be much appreciated.
Thanks
Dash Engine light has been on for several months and simple DIY computer reports DTC P0171 System Too Lean Bank 1
Proper Jaguar garage computer apparently reports both banks running lean.
More recently accelerating quickly or going uphill results in Restricted Performance dash light with obvious restrictions.
The engine light now stays on permanently but the Restricted Performance light clears by itself if I slow down and doesn't require the car to be restated to clear it.
Generally at Restricted Performance light doesn't come on if driving at <50 mph although it will cruise on the flat at 70 mph without Restricted Performance just as long as I take my time to accelerate up to 70 mph slowly.
Otherwise the engine is running sweetly and the car goes fine without any misfires etc.
So basically the problems occur when the engine is powering under load.
Lambda sensors seem OK.
Petrol filter replaced but doesn't help.
Several engine air leaks sealed but still no joy and symptoms persist.
Jaguar Garage mystified.
Any ideas please would be much appreciated.
Thanks
#3
Yesterday | 06:15 AM
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Junior Member
Joined: Jun 2014
Posts: 7
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From: Eastbourne Sussex UK
Jaguar Garage wasn't specific but said there were several hoses that they fixed and that the engine was now seal tight.
I'll phone them on Monday but I think the answer could be a bit vague.
IMO they probably want the car back to make further checks for which they will inevitably and understandably charge.
Such is life !
I'll phone them on Monday but I think the answer could be a bit vague.
IMO they probably want the car back to make further checks for which they will inevitably and understandably charge.
Such is life !
#4
Yesterday | 11:58 PM
Junior Member
Joined: Jun 2024
Posts: 12
Likes: 1
From: San Diego
Lean running.
Assuming the garage checked your system properly, there should be no EVAP leaks. Does your car have an EGR valve?
My guess would be a leak on the EGR system because the EGR valve opens under heavy load or acceleration.
On my XKR supercharged 4.0 engine, there is a metal pipe from the RH manifold to the EGR valve and that pipe can crack, causing air leaks.
Air can get sucked into the inlet if the valve is open. Stuck open EGR would also allow too much flow in but it would be at all times.
If you don't have an EGR valve then it does not apply. Just thought I would ask.
My guess would be a leak on the EGR system because the EGR valve opens under heavy load or acceleration.
On my XKR supercharged 4.0 engine, there is a metal pipe from the RH manifold to the EGR valve and that pipe can crack, causing air leaks.
Air can get sucked into the inlet if the valve is open. Stuck open EGR would also allow too much flow in but it would be at all times.
If you don't have an EGR valve then it does not apply. Just thought I would ask.
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