Question about 1995 Jaguar XJ6

1 Answer

Jag XJ6 revs are too high

I HAVE A 95 JAG XJ6 3.2 PETROL AUTO.THE ENGINE IS CONSTANTLY RACING,FROM 1200RPM UP TP 2000RPM.I REPLACED THE IDLE CONTROL VALVE AND THERE ARE NO AIR LEAKS OR ANYTHING.THE CRANK SHAFT SENSOR HAS BEEN REPLACED ALSO.THERE ARE 2 SENSORS ON THE THROTTLE CASING.1 ON TOP AND 1 ON THE BOTTOM OF IT.IF I CONNECT THE WIRED CABLE TO THE BOTTOM SENSOR.THE ENGINE WONT START.BUT IF I LEAVE IT DISCONNECTED THE ENGINE WILL START BUT STILL RACING.I HAVE A FEELING THIS BOTTOM SENSOR HAS SOMETHING TO DO WITH THE REVS BUT DONT KNOW WHAT.LIKE I SAID,THE IDLE CONTROL VALVE WAS REPLACED WITH A BRAND NEW ONE SO I KNOW ITS NOT THAT.OILING THE THROTTLE ISNT DOING ANYTHING EITHER.ANY HELP AT ALL WOULD BE MUCH APPRECIATED............

Posted by on

  • 2 more comments 
  • stuecampbell Jan 25, 2009

    I have a similar problem. My 1995 XJ6 x300 idles between 1800 and 3000. I have not vacuum leaks and have replaced the whole throttle body including the throttle positioner and the ICV at the top of the throttle body.
    I am stumped!
    Any help would be appreciated.


  • Glen Byrne Feb 22, 2009

    cleaned the throttle body carefully.still the same.im losing hope.......

  • Ian Jones May 11, 2010

    sounds like air leak to me!

  • drife May 11, 2010

    Hi glen the sensor on the bottem of the throttle body is the throttle position sensor it also cuts out the injectors on throttle over run. Has the sensor moved it is adjustible, if you are sure there are no air leaks remove the rubber inlet and check the throttle butterfly gap to the body should be a tight 2 thou, there is a allen key adjustment at the stop.  One last thing when the car is running is the throttle returning to the stop  

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 100 Answers

If you have replaced the Throttle postion sensor (TPS) or have replaced the battery, sometimes the car will need an engine set up.
I had the same problem with my xj6 and I did an engine set-up and it has been fine for the last 2 years. Also with the idle doing what it did it had a very harsh shift when driving and changing gears.
The BAD news is the dealer has to perform the engine set-up using the WDS (worldwide diagnostic system) The set-up will set the kick down switch, it will calibrate and set the TPS and also perform an oxygen sensor orientation test.
With the set-up it will allow the TPS sensor to be adjusted to the correct factory specs.
Sorry you can't do this your self.
This is obviously if there is no vac leaks and the throttle butterfly is set to 2 thousands of an inch. (gap on the side when closed throttle) check with a feeler guage.
JPTCAT

Posted on Feb 17, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Will not idle when cold. On gas its OK when hot. On petrol rough running and stalls at idle when hot


The Idle air control valve ( IAC ) Gets dirty over time and needs cleaned from years of use. Remove and clean carbon from it, Also clean throttle body with throttle body cleaner. At most auto parts stores Advanced, Auto zone, ETC.

May 12, 2016 | 1997 Toyota Land Cruiser

1 Answer

Why does my 1997 transit 2ltre petrol engine idle to fast


Clean the Mass air flow sensor, the throttle body(inside it as best you can), and the idle air control motor. Brake clean works good. Just spray the MAF, and use a toothbrush on the throttle body and IAC motor. Clean the back side of the throttle plate and where they seat.

Oct 10, 2014 | Cars & Trucks

1 Answer

What could keep throwing this P0507 code? Even eith a new idle air control valve?


Throttle positioning sensor.might have a vacuum leak to throttle body

May 18, 2014 | 2000 GMC Jimmy

1 Answer

When I start the car it stays at 2000rpm for a few moments then drops down. I'll drive for a few minutes then put it in park and it revs up and down.


idle air control valve is bad replace it. at start up choke control runs till warm up while driving throttle opening controls engine at idle ,the idle air control valve.

Aug 01, 2012 | 2005 Chevrolet Aveo

2 Answers

Engine is racing and will not kick down to normal idle. Air intake sensor was replaced and fuel injectors . 1991 ford taurus 3.0 engine


does the idle drop if u disconnect the idle speed control air bypass valve at the throttle body?

Jul 09, 2009 | 1991 Ford Taurus

1 Answer

Rough idle


might be your egr valve

May 01, 2009 | 1995 Jaguar XJ6

2 Answers

Nissan Quest 2001 turns off when idle


Idle air control at base of throttle body. Passages could be plugged or idle hard stop needs adjusting.

Air Intake System Sensors Air intake system sensors include a heated resistor-type mass air flow (MAF) sensor and throttle position (TP) sensor; both supply data to the powertrain control module (PCM). The PCM also monitors engine speed.
Air Intake System Control Devices The idle air control (IAC) solenoid regulates idle speed by adjusting the amount of air allowed into the intake manifold. Adjustment is made by varying the duty cycle output by the powertrain control module (PCM). The PCM will increase the duty cycle for added mechanical or electrical loads. The IAC solenoid is combined with the fast idle control (FIC) solenoid which is turned on when the air conditioner is engaged to help compensate for the additional load. The IAC valve must be replaced as an assembly with the FIC solenoid.
Fast Idle Control (FIC) Solenoid The fast idle control (FIC) solenoid (Figure 1) compensates for idle speed change caused by the operation of the air conditioner compressor. The FIC solenoid is controlled by the FIC relay. The FIC relay is energized when the air conditioner clutch is energized and the relay allows the FIC solenoid to turn on and let an additional volume of air into the intake manifold.
Figure 1: Fast Idle Control (FIC) Solenoid
53edf6d.gif
47fb9be.gif ------------------------------------------------------
Throttle Body (TB) The throttle body (TB) controls the amount of air that flows into the engine through a single butterfly valve. The single butterfly valve opening is determined by the accelerator pedal. The TB is cast with an air bypass channel and houses several emission-related components for the powertrain control module (PCM).
--------------------------------------------------------
Throttle Position Sensor (TP Sensor) The throttle position (TP) sensor responds to the accelerator pedal movement. The TP sensor is a potentiometer that transforms the throttle plate opening angle into output voltage and sends the voltage signal to the powertrain control module (PCM). In addition, the sensor detects the opening and closing speed of the throttle plate and sends the voltage signal to the PCM. Also, the TP sensor is used to determine the air intake when the mass air flow (MAF) sensor fails. This mode of operation is called Fail Safe.
The TP sensor integrates the idle (IDL) switch within the housing. The IDL switch detects when the throttle plate is closed and an idle condition occurs. The PCM is supplied with this input signal.

IDLE SPEED

6bee6c3.gif

Apr 03, 2009 | 2001 Nissan Quest

2 Answers

IDLE SPEED CONTROL VALVE IN JAG XJ6


Hi the idler valve has a set up with jag equpment but there is a way round this,ifyou have had  O2 sensors changed, is the idler working what are the revs when hot. 650 is to low  850 is ok with a hot engine Mike do you know where the idle valve is and the allen key manual adjustment try a quarter turn but mark it so you can turn it back if need be. let me know how it goes   D    

Jan 11, 2009 | 1995 Jaguar XJ6

2 Answers

Idel problems with 1999 Taurus wagon


If there is no check engine light on I would go the local auto parts
store and check out the TP sensore first and then the Mass air flow...

May 26, 2008 | 1999 Ford Taurus

Not finding what you are looking for?
1995 Jaguar XJ6 Logo

717 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jaguar Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22026 Answers

yadayada
yadayada

Level 3 Expert

69244 Answers

SPEEDY CAR WORK SHOP...

Level 2 Expert

447 Answers

Are you a Jaguar Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...