RE: XJR Restricted Performance
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RE: XJR Restricted Performance - 5/15/2007 8:03:51 AM
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FL XJR
Posts: 66
Joined: 4/6/2007
Status: offline
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Found it...
quote:
ORIGINAL: Envy337
Throttle plate gets STUCK. It does not let enough air in and floods the engine. CLEAN the plate.
quote:
ORIGINAL: Envy337
Remove the intake tube going to the throttle body. Check to see if you have a black build up around the throttle plate. If so, clean it
off with throttle/carb cleaner and a rag. Disconnet the battery for a few minutes, turn it on, let idle till it reaches operating temperature.
Guess I'll give it a try and see what happens. I'm not going to disconnect the battery, though, since I think the purpose of that would be to reset the error message and mine's not showing the error message anymore.
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RE: XJR Restricted Performance - 5/15/2007 5:19:43 PM
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Envy337
Posts: 296
Joined: 3/29/2007
Status: offline
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The readings at idle look normal. . Anything over 10% (rich or lean) at idle is when you have an issue.
A lean condition means you have more air (unmetered) than fuel. The mechanic had it backwards.
A common cause of a lean condition is a vaccum leak. Air getting into the engine with out being metered by the mass air flow meter.
Check the intake tube (the plastic pipe from the air box to the throttle body), make sure it has not holes. The intake tube tends to crack where it flexes. Check to see if its tight on the throttle body.
To clean the throttle body, just the remove intake tube. If you see a black build up in the throttle plate, clean it with carb cleaner.
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RE: XJR Restricted Performance - 5/15/2007 5:21:39 PM
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Envy337
Posts: 296
Joined: 3/29/2007
Status: offline
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Disconnect the battery, the purpose is to let the throttle plate readjust itself to proper idle.
On Jaguars, disconnecting the battery wont clear the codes.
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RE: XJR Restricted Performance - 5/15/2007 5:33:26 PM
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FL XJR
Posts: 66
Joined: 4/6/2007
Status: offline
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Thanks for the follow-up. Not sure where the fault occurred. The intake pipe was secure and no cracks or holes. I cleaned the rubber gasket that fits between the throttle body neck and the intake pipe. It was a bit dirty/gritty. At any rate, it seems to operate just fine now...
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RE: XJR Restricted Performance - 5/26/2007 7:03:52 AM
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FL XJR
Posts: 66
Joined: 4/6/2007
Status: offline
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My bliss was short-lived. The "restricted performance" message came on several times on my way from Gainesville to St. Pete. Everytime I accellerated on the on-ramps the warning would come on. It would go out after about five or ten miles at highway speed but, of course, the engine light stayed on all the time. Made a pit-stop at Aston Martin/Jaguar of Tampa. Fortunately, my timing was impeccable and they got the car right in and diagnosed a bum airflow meter. (deja vu, n'est ce pas?) They also said the fuel system was about 5psi shy (which would contribute to it's losing pep on spirited accelleration). So, replaced the airflow meter, replaced the fuel filter, performed fuel system clean including throttle body service, rotated the air in the tires and topped off the blinker fluid (muffler bearings had already been repacked  ). Picked it up on the way back from St. Pete (they gave me a loaner X-Type to fart around in whilst my car was being serviced) and it has the old pep again! No issues on the way back to Gainesville. (hence, I'm happy again  )
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