Reduced Performance Warning
#1
02-27-2018, 04:18 PM
Reduced Performance Warning
First time experienced this warning light today. I had driven for about 20 min. And decided to “air it out on an entrance ramp. 3rd gear at about 5,000 rpm the car drastically drops power and a triangular signal with REDUCED PERFORMANCE Comes on. Car continues to run but with major loss of power. Some 4 hours later after letting the car sit I drive home and have no problems. Anyone experienced this before?
2012 XKR
2012 XKR
#2
02-27-2018, 04:59 PM
Veteran Member
#3
02-27-2018, 05:48 PM
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#4
02-27-2018, 05:56 PM
Veteran Member
Restricted Performance specifically limits your rpms so that you don't damage the car. That is why you felt a significant loss of power. It did what it was supposed to do. Recently, I had restricted performance warning that was related to fuel pressure in the direct injection system and had to replace the pumps. Read the codes and you should be able to find source of the warning.
#5
02-27-2018, 08:20 PM
Senior Member
Is the check engine light on? If so read the code(s) and see what they say. Not all, or even most to the restricted performance will trigger OBD codes and the check engine light. I know, from experience, that some ABS, throttle body, and transmission faults will trigger the restricted performance. If the check engine light is not on you need to read the various ECMs to find which detected the fault. This requires the Jaguar SDD or similar diagnostic tool.
Or, just drive the car and see if it happens again. Many of the V8 Jags that I have owned have gone into restricted performance mode, for unknown reasons, at one time or another. Shut it off, restart, and everything is usually OK, for awhile anyway.
Or, just drive the car and see if it happens again. Many of the V8 Jags that I have owned have gone into restricted performance mode, for unknown reasons, at one time or another. Shut it off, restart, and everything is usually OK, for awhile anyway.
#6
02-28-2018, 04:38 AM
Veteran Member
When my 2007 XKR went into restricted performance it was always on the on ramps when airing it out. In my case it was a piece of foam in the catalytic converter had come loose and was partially/barely blocking one cat. No issue's until I started pushing large amounts of air through it. Pull the codes first and go from there. I'm not saying this is your issue but it was mine.
#7
02-28-2018, 08:15 AM
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#8
02-28-2018, 08:24 AM
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#9
02-28-2018, 10:15 AM
Thanks everyone, many good points. Today, no issues so hopefully just a gremlin at that time. Other points to some of the questions. Car was in Drive so it did not over rev. New battery less than one month old but I will check it. It seemed that the issue might be in the transmission since after the incident when trying to speed up it almost seemed the transmission was slipping. At any rate I have had other small issues over the year that correct themselves after turning the car off and then restarting. I guess sometimes it just needs to clear its mind. One other thing. Does anyone have problems with the computer screen blacking out occasionally?
#10
02-28-2018, 06:06 PM
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Only time I’ve had the blacking out screen, was on a long drive on a hot day (air con on) in stop and crawl traffic. After an hour, and then for the next several hours, until the traffic let up, it would black out, and then restart after a minute or two. Would do this every 5 to 10 minutes.
I put it down to low battery voltage (the voltage gauge in the 12v outlet in the glove box was reading 11.something volts.
I put it down to low battery voltage (the voltage gauge in the 12v outlet in the glove box was reading 11.something volts.
#11
02-28-2018, 06:33 PM
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#12
03-01-2018, 03:44 AM
Senior Member
All great guesses but without reading the codes you'll never know.
Get yourself a code reader and save yourself a load of wasted time.
Get yourself a code reader and save yourself a load of wasted time.
#13
08-13-2018, 02:03 PM
Well the old “Restricted Performance came on again today. Same situation. Hard acceleration going onto ramp. At about 6,000 RPM a couple of misfires and then Restricted Performance. I was then parked and out of the car for about 1 hour. Got back in and everything fine so I decided to see if I could duplicate. Sure enough after hard acceleration, warning came on again along with the engine warning symbol.
My extended factory warranty is up in 1 month so I am wanting to get this resolved. Will take to dealership but would welcome any input. 2012 XKR convertable with 46,000 mi on the clock. Has been a great car. Unfortunately there is really no place to really enjoy the performance. Mine is driven mostly around town so it could be a little “carboned up”.
My extended factory warranty is up in 1 month so I am wanting to get this resolved. Will take to dealership but would welcome any input. 2012 XKR convertable with 46,000 mi on the clock. Has been a great car. Unfortunately there is really no place to really enjoy the performance. Mine is driven mostly around town so it could be a little “carboned up”.
#15
08-13-2018, 03:43 PM
Senior Member
#16
08-13-2018, 04:05 PM
Did not see any noticeable exhaust emissions. I have had the “missing” before after in city driving for a long time but it normaly clears up and no “restrictions”. I remember “back in the day” when I would take my 64 Ford 390 out and “blow it out”. Lots of skipping and smoke and then it would really run. To some degree I think it is necessary to run the car hard occasionally but it could be that this protection device shuts the engine down before it has a time to clean out.
#17
08-13-2018, 05:17 PM
Veteran Member
Mine did that Restricted Performance right after I floored it to get around an idiot parked in the fast lane. Was it like SERIOUSLY restricted performance? I barely limped the couple miles home. You may have not noticed any smoke, but was there perchance a scent of gasoline (or petrol, you don't have your location posted)?
The problem I had was one bad injector, but all four on that side were replaced.
The problem I had was one bad injector, but all four on that side were replaced.
#18
08-13-2018, 07:53 PM
It's a waste of time speculating on potential faults until you have scanned the car and read the codes.
In saying that... i'd be willing to bet your intercooler pump is dead, given that this is only happening when you're giving it some stick.
Which by the way, it's a very stupid thing to be doing given that the car has a fault, and you seem to be sticking your head in the sand about it.
Get the codes read, don't beat up on the car until the problem is fixed.
In saying that... i'd be willing to bet your intercooler pump is dead, given that this is only happening when you're giving it some stick.
Which by the way, it's a very stupid thing to be doing given that the car has a fault, and you seem to be sticking your head in the sand about it.
Get the codes read, don't beat up on the car until the problem is fixed.
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#19
08-13-2018, 08:19 PM
Senior Member
It's a waste of time speculating on potential faults until you have scanned the car and read the codes.
In saying that... i'd be willing to bet your intercooler pump is dead, given that this is only happening when you're giving it some stick.
Which by the way, it's a very stupid thing to be doing given that the car has a fault, and you seem to be sticking your head in the sand about it.
Get the codes read, don't beat up on the car until the problem is fixed.
In saying that... i'd be willing to bet your intercooler pump is dead, given that this is only happening when you're giving it some stick.
Which by the way, it's a very stupid thing to be doing given that the car has a fault, and you seem to be sticking your head in the sand about it.
Get the codes read, don't beat up on the car until the problem is fixed.
#20
08-15-2018, 02:16 PM
Problem solved in my case
Hi just had an XF in today 3.0 diesel for the warning light “reduced performance” I ran the diagnostics and the car threw up 9 faults. Most were Air flow related. After looking online and finding your comments I began to think the worst, boost leaks, turbos, boost leaks, intercoolers... etc etc as the computer only picks up electrical faults I decided to check the engine bay for anything amiss. So this is what I did.
Cleaned airflow meters- reset codes.=still no better.
Further investigating, I lifted the engine cover and found 3 plastic vac pipes that sit on the top of the engine just below the cover to the left of the engine. One had broken off completely. I managed to make one from an old engine that was lying around. Just as a temp solution. I reset the codes and started the car.
Problem solved!!!!!!! New pipe ordered from the dealer. £70. Not cheap. The pipe is an “S” shape and around 6cm long.
This may not the the case for everyone out there but hopefully this helps.
Cleaned airflow meters- reset codes.=still no better.
Further investigating, I lifted the engine cover and found 3 plastic vac pipes that sit on the top of the engine just below the cover to the left of the engine. One had broken off completely. I managed to make one from an old engine that was lying around. Just as a temp solution. I reset the codes and started the car.
Problem solved!!!!!!! New pipe ordered from the dealer. £70. Not cheap. The pipe is an “S” shape and around 6cm long.
This may not the the case for everyone out there but hopefully this helps.
