The subject who is truly loyal to the Chief Magistrate will neither advise nor submit to arbitrary measures. This article was published more than 7 years ago.
Some information in it may no longer be current. Why do these premium vehicles all require higher octane fuel, as the fuel price is 13 or 14 cents per litre higher than for 87 octane fuel?
Luxury SUVs have powerful high-performance engines, and those engines need gasoline that won't cause knocking. A higher octane number means that the fuel is less susceptible to knocking," says University of Alberta engineering professor Bob Koch. If it's recommended by the manufacturer, it's needed for your engine. High performance engines have higher torque and horsepower because they're designed to allow for much higher compression of the fuel and air inside the engine's cylinders.MAF and PCV Replacement 2006 Range Rover Supercharged
That high compression ratio is only possible with a fuel with a higher octane rating. Put regular fuel in a high-compression engine and it will burn too quickly; you'll get engine knock. That sound — sort of like popcorn popping, but a lot faster — is the gasoline exploding in the cylinder. In North America, regular grade fuel ranges from 85 to 87, midgrade is from 88 to 90, 91 to 94 is premium, and over 94 is super premium. Most premium SUV manufacturers recommend premium, but many say their engines can run on midgrade in a pinch.
BMW recommends premium but allows 89 in all of its vehicles except the M-cars which require However, they say that using midgrade gasoline can lead to knocking when starting your vehicle when it's hot outside.
In addition, BMW doesn't recommend using regular fuel. If you do use regular gasoline in a vehicle designed for premium, the engine's knock-sensor will detect uncontrolled burning in the chambers and adjust engine timing. But even though the engine will compensate for the cheaper gasoline, it comes at a cost — you'll lose power and you'll get worse mileage, Koch says.
In addition, he says, increased engine compression actually improves mileage — so, you're using pricier gas, but you're using less of it. I checked with the manufacturers and premium is recommended in all luxury SUVs, with a few exceptions — the Cadillac Escalade Hybrid 6. Recommended generally means that fuel rated as low as regular 87 gas can be used with the warning that reduced acceleration and knocking could result — but check with the dealer and the owner's manual to be sure.
Iny says the difference in performance will probably be imperceptible to most drivers during normal driving. But the consensus is that premium should be used if the manufacturer recommends it. And note that premium fuel doesn't give you any significant benefits in vehicles that recommend regular fuel, says Consumer Reports.
If your car recommends regular, use regular. If you have any driving queries for Jason, send him a message at globedrive globeandmail. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way.
Click here to subscribe. If you would like to write a letter to the editor, please forward it to letters globeandmail.Forum Rules. Remember Me? Results 1 to 6 of 6. Thread Tools Show Printable Version. I THINK this issue of mine has now been solved, but I thought I would post my experience here briefly for archiving and discussion; hopefully it might help others. Bought 2 year Allianz warranty also. Drove like a champ; didn't miss a beat. Charged to green maintenance mode fine.
Restarted the car straight away and then it seemed to drive fine till I parked it. Stuck it back on the trickle charger. The warnings were intermittent, with the car behaving perfectly fine in between.
Loading the alternator up with accessories blower, cooled seats, stereo, TVs etc. This time with red triangle. Car cut out completely; rotary gear knob sunk back into the console. Tried restarting multiple times but just got a series of clicks. Gave it about a minute's rest; then managed to fire it up. Greg from ULR advised we'd start with the battery.
Alternator also tested fine according to them. Sorry for the long read. Fingers crossed that has sorted it; but will add any other updates as they are due.
Anyone else experienced the Restricted Performance issues on the 4. I did a search and found some other occurrences but mostly with other LR models like Evoque or Disco. Oh and here's a couple of pics of the beast. Cheers Matt. Battery was 18 months old when it failed to start.
The battery was regularly charged every month overnight on a Ctek 7amp. I did as advised and charged the battery again. It was OK for a couple of days but then wouldn't start the car. I took it back to the supplier and again it couldn't be faulted so I bought a new one and the other was sent back to the manufacturer for testing. Some 6 weeks later I got a call from the supplier saying that after several tests the battery was found to be faulty. They very kindly refunded the money I had paid for the new battery.
Where does the battery live on your year, on the earlier years it can not be removed unless the bonnet is put in service access position, which means unclipping the bonnet struts to raise it more and locking the bonnet stay.Forums New posts.
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Reduced Engine Performance
Reduced engine performance. Thread starter dimi65 Start date Nov 22, Messages 9 Points Ihave a Freelander 2 diesel automatic gear box model having done so far,kms.
I had twice this problem in the past, first at 80,kms and second atkms. The problem in the first time was solved by changing the fuel diesel filter and the second time by reprogramming the turbo charger.
This time, when I brought the car to the Land Rover's mechanics, the diagnostic machine came with the message indicating the fault: "turbocharger overboost" and the recommendation suggested by the computer was to "reflash the turbocharger". So, they've done it and the problem ceased to exist, so far.
However, this left me with two questions : 1 what are the possible causes of this loss of power, because it can be dangerous if it happens when you attempt an overtake or if you are in a deserted mountainous place and 2 if there is a necessity of replacing the turbocharger after some time and mileage, which is of course the most unwanted and expensive solution.
Should I be concerned? Post: 2. SSamson, one of the Australian member got a similar message. See thread link below Restricted Performance. Post: 3. Thanks for the link! Perhaps concern is called for after all. Post: 4. There seem to be two separate parts to this.
The link you highlighted above seems to be where the car goes into a safety mode, perhaps because the onboard systems have noticed something wrong with one of its sensors.
The second is a design feature of the engine. When you start to get to a low fuel level the vehicle will show the "Reduced Performance" message and will cut down the power of the engine. It's designed as a failsafe system I guess so you don't run out of fuel. Once you have filled up you might find that it needs to be turned on and off to allow the system to reset but that should then get you back to normal.
Hope this helps Steve. Post: 5. Priming a high pressure fuel system is apparently very difficult, also the fuel pump and some parts of the fuel system are lubricated by the fuel so running the tank to dry would do terminal damage to the system. Post: 6. Thanks Steve, I linked it as I was not sure if they were related or not. Thanks for the clarification. Post: 7.LandyZone is the biggest Land Rover forum on the net. We have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.
Cookies Welcome Guest. Range Rover 4. Joined: Apr 10, Posts: 36 Likes Received: 1. After much investigation by Landrover and a great new piece of kit they plugged in, the fault was recreated and it turned out to be the cooling pump to the supercharger.
Apparently there was high resistance showing across the wiring which caused the problem of "reduced engine performance". Hope this helps anyone else with such an irritating issue, the car now drives beautifully. Grrrrrr likes this.
Joined: Sep 30, Posts: 1 Likes Received: 0. V8Sep 30, Joined: Feb 1, Posts: 11 Likes Received: 0. I have had this fault today when stopping and putting into reverse and my reversing camera didnt not work then when reversing it started to work then i had the beep beep then engine performance reduced came on the dash no lights on dash so i left it checked the oil it was a lil low so i topped it up and then drove to the garge about 5 miles away and they diagnosed it and there was no faults stored what soever and we test drove it and then tryed again but no faults no codes and no message on dash made me look as if i made it up but i did notice my reversing camera does not come on anymore?
ChickenGeorgeSep 29, GrrrrrrSep 30, You must log in or sign up to reply here. Show Ignored Content. Your name or email address: Do you already have an account? No, create an account now. Yes, my password is: Forgot your password?Forum Rules. Remember Me? Last Jump to page: Results 1 to 10 of Thread: D4 Restricted Performance. Thread Tools Show Printable Version. D4 Restricted Performance. Apparently the first ever error in two years.
But again today the "Restricted Performance" error appeared before disappearing, but the performance of the actual car became sluggish.
Haven't heard back from LR as yet but was wondering if anyone else has experienced the same issue? Why was it towed - still drives with "restricted performance".
Mine still does kph with restricted performance illuminated. Did you go through the ECU reset procedures as it often fixes the issue at the time. Thanks for the reply. The car still drove but as mentioned, seemed to be running ruff. Can you please explain what I need to do?
Originally Posted by garrycol. MY12 RRV 4. Originally Posted by Graeme. Originally Posted by westek. My 3. We had been hammering through central Qld on our way to the Gold Coast when we were detoured due to floods around Gundawindi. Anyway it was a 13 hour driving day.
Reduced Engine Performance
The following day she fired up as usual, within about 3 mins after starting, I pulled out of a driveway and stuck my foot into her to beat some traffic. She was not at all responsive to my demands, very sluggish, no power and a bucket load of white smoke bellowed out behind me from the twin exhausts. This "Reduced Performance" warning came up on the dash and I thought I had done a head gasket.
I pulled over and turned off the car. Wiping the sweat beads of my brow, I fired her up again - No warning, no smoke, no further issues for the next 2 years. I can't explain what happened but after the event I assumed the computer was unhappy about something? Cheers, Shane.
Thanks for all the feedback. Called LR last night and they were still looking into the issue. I will provide an update once I know what they found or didn't find. I'll definitely try the reset next time. Just picked up the car. Inspected for water in diesel - none evident. Removed and replaced fuel filter housing assembly to rectify.
Car is running well again, fingers crossed. Last Jump to page:.We've detected you're not using the most up-to-date version of your browser. By upgrading to the latest version of Internet Explorer you'll see and be able to use this site in the way we intended and your general internet browsing will be more secure as it will have been upgraded to take into account the latest security standards.
The message center displays a series of messages when the DEF level becomes low. The first message states that the DEF level is at a level where a refill is advised. The third message starts a countdown of the distance remaining until the DEF tank is empty, after which the vehicle will fail to start.
The final message is accompanied by a RED warning icon and is displayed when the distance remaining is zero and states that no further restarts will be possible until DEF is added to the tank. Your local Land Rover Retailer will also refill the tank as part of your scheduled maintenance. Please refer to your Owner's Handbook for more information.
The DEF reservoir filler cap is located under the hood on the right hand side when facing the front of the vehicle. The distance until your next DEF refill can be viewed at any time in the message center on the dashboard. Switch on the ignition, but do not start the engine. Check that a valid smart key is inside the vehicle and ensure that the brake pedal is not pressed.
Press the OK button on the steering wheel control to access the Main Menu. On some models, repeatedly press the OK button until Driver Assistance is displayed. Using the down arrow button on the steering wheel control, scroll down and highlight Vehicle Info.
Scroll down to highlight Diesel Exhaust Fluid. On some models this is displayed as Next Service. These bottles have been specifically designed for ease of use and to prevent any dripping.
We do not recommend refilling the tank using any other type of container.
Refill the DEF tank at the earliest opportunity. An average consumption of DEF is 2. However, consumption can vary greatly depending on your driving style, the weather and road conditions. Stored in a dedicated tank in your car, DEF is injected into the exhaust system to clean exhaust gases.
FAQS. On some models, repeatedly press the OK button until Driver Assistance is displayed 3. Press the OK button to confirm selection. The consumption of DEF can vary greatly. An average consumption rate can be 2. Should you run out of DEF, your Land Rover will not restart after you switch off the engine — this is a legal requirement.