The warning icon and message for "restricted performance" came on, along with some slight engine "coughing" for lack of a better description. But, after I turned off the car for an hour and turned it back on, the engine ran normally altho' the warning icon remained. Car seems to be fine otherwise. What could be the causes of this?
This is common if your throttle is electronically controlled and not cable controlled like (older cars). If the throttle body main butterfly sticks for a fraction of a second because it's cold and the throat is full of carbon, for safety the computer will kick it into that mode. This can also happen if the throttle sender unit on top of your throttle peddle is faulty ... or kicked and the plug is not all the way in. A simple code reader can reset the issue but if it happens again start by cleaning the throttle body.
SOURCE: "Restricted Performance" message and rough idling
My mechanic said that the front cxygen sensors needed to be replaced on my 03.
SOURCE: Jaguar s-type restricted performance displayed
Its most likely the coils and spark plugs, sometimes caused by oil leaking from the valve cover gasket. The coils deteriorate over time from engine heat and need to be replaced at 90-100k
Local garages don't have the Jaguar diagnostics terminal and are unable to do more than find basic error codes with a reader. Its important to get this fixed because it's causing damage to your caltalytic converters. They are expensive.
SOURCE: check engine light is on,display says restricted performance
Anything can cause the check engine light to go on from a loose gas cap, to a transmission issue. When the onboard computer detects an issue, it will restrict performance so as to not damage the engine any further. An Oil change won't affect this light. The only way to determine the cause of the light is to have the computer scanned with an OBD-II tool (Autozone does this for free) to determine the codes and cause for the light. You can also clear the light with the OBD-II tool, but if the problem is still there, the light will just come back on
SOURCE: Jaguar xk8 1997 The throttle
My throttle body problem was diagnosed by the local Jaguar dealer (Barrett Jaguar in San Antonio, TX). They wanted $1200 to fix it. I had read on the internet that the throttle body should be cleaned out first because that could be the problem. When I asked them if they could clean it first to see if that is what is wront they told me that it would not do any good. It was an electronic problem and the whole thing needed replacing. I had my brother-in-law who is a mechanic clean it out for us and reinstall it. We have had no more problems. Can you believe I got a coupon in the mail yesterday from Barret Jaguar for a $143.50 throttle body cleaning special!!!!!! Liars all of them! Don't trust your dealer to tell you the truth! They just want as much money as they can **** out of you.
SOURCE: jaguar s-type restricted performance
I had the same problem. Restricted performance and running rough at 3000 RPM. I have an OBDII code reader and found that the problem was in the air mass flow sensor, which is just after the air filter. I pulled this out and found it was dirty and had butterfly wings in it. The last shop where I had the oil changed replaced the filter for me but put in the wrong size. Close but no cigar. Bought some *** Flow Sensor cleaner at auto store and fixed the problem. Get an OBDII reader with the ability to erase the codes. Comes in real handy.
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