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Restricted Performance warning and check engine light came…

Restricted Performance warning and...

Restricted Performance warning and check engine light came on. Sluggish upon start up, like it's going to die unless I rev gas.

Mechanic's Assistant: Does the light stay on, or does it blink?

Check engine light stays on, restricted performance message comes and goes.

Mechanic's Assistant: What is the model/year of your Jaguar?

Had new tires put on last week, oil changed and air filter replaced one month ago 2004 s-type

Mechanic's Assistant: Are you fixing your S-Type yourself? What have you tried so far?

Haven't tried anything yet, not super tech-savvy when it comes to cars.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Car has 157,000 miles on it

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Customer reply replied 4 years ago
Oil was changed and air filter replaced at Valvoline place. I usually put premium gas in it.
Answered in 1 hour by:
11/29/2018
Jaguar Mechanic: 6Bucs, ASE Certified Technician replied 4 years ago
6Bucs
6Bucs, ASE Certified Technician
Category: Jaguar
Satisfied Customers: 1,676
Experience: Master tech with 18 years dealer experience
Verified
Hello and thank you for your question. My name is***** work for you, not the website and am only paid by them when you are satisfied with my answer and offer a positive rating for it. Phone call requests come automatically from the site, not from me. They are an additional charge and that option is up to you. Ok let’s get started.Does your S type have the 3.0l or 4.2l engine?
The check engine light indicates the computer has stored a trouble code for the fault. This needs to be read with an OBDII code reader. If you’ve had the codes checked, please list them here.Lastly, does the engine run better or worse after it has warmed up?
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Customer reply replied 4 years ago
I don't know the engine type and I haven't had the codes checked yet. Thought I would do that today, just wanted to get an idea of what it could or what the problem could cost to fix.Runs better once it has warmed up.It's a 3.0 L V6.
Jaguar Mechanic: 6Bucs, ASE Certified Technician replied 4 years ago
Ok this indicates a vacuum leak. I’m not there to see it myself but here’s how to pinpoint it.
You can listen for a hissing noise while the engine is running or spray carburetor cleaner in small bursts around the intake manifold and listen for the idle to change which will indicate a leak
1. Check all over for vacuum leaks or false air leaks, exhaust leaks, or crankcase ventilation leaks. Specifically verify no leakage past Intake Manifold Tuning (IMT) valve o-rings.2. Inspect connections at the throttle body and check for leakage around the gasket, inspect connections at the accelerator pedal sensor.3. Connect a fully functional Jaguar compatible scan tool such as IDS or equivalent, read the output of Mass Airflow Sensor (MAF) at idle. Idle output should be approximately 3.5-4.5 G/S. At 2000 RPM no-load, it should be approximately 8-14 G/S. At approximately 45 MPH, with wide open throttle acceleration, 4000+ RPM, it should be 120-155 G/S. If MAF doesn't meet these specs, make sure there is no flow restriction through air filter or intake.4. Observe operation of Engine Coolant Temperature (ECT) on scan tool while driving, make sure that temperature remains above 175°F on scan tool while driving to verify thermostat performance. Also watch Injection Pressure (IP) sensor; it should always be between 32-65 PSI/2.2-4.5 bar.Typically on the 3.0 it’s a leaking pcv tube or an intake gasket.
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Customer reply replied 4 years ago
Great info, thanks.
Jaguar Mechanic: 6Bucs, ASE Certified Technician replied 4 years ago
Right on. Verify the OBDII codes when you can and if you can leave a positive rating for me I’d appreciate it.
6Bucs
6Bucs, ASE Certified Technician
Category: Jaguar
Satisfied Customers: 1,676
Experience: Master tech with 18 years dealer experience
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