How to adjust the idle speed on a Jaguar?
Check everywhere for vacuum leaks. A small vac leak will usually give you a slightly high idle but a larger one will give a low, lumpy idle. You’ll also want to adjust the throttle plate to the specified .002 clearance (this adjustment IS made at the throttle body)
How can I test the throttle position sensor?
To test it, you’ll need to hook your voltmeter up to the red and yellow wires connected to the TPS without disconnecting the harness. I used threaded needles and poked them through the wire insulation as shown in the photo. Have the ignition on, with the Throttle Pulley at the idle position.
What should the voltage be on the throttle pulley?
The voltage should measure between 0.32 and 0.36VDC. If not, remove the Throttle Pulley and loosen the three small mounting screws holding the TPS and rotate the TPS until the voltage reading is within range.
How to adjust idle speed on Jaguar XJ6 SIII?
Everyone who tried to adjust the idle speed on a XJ6 SIII knows that it’s rather difficult to get at the adjuster screw because the air flow meter is in the way. If you take the air flow meter out, you can reach the adjuster but the engine doesn’t run, so no idle adjustment can be carried out.
Where is the speed adjustment on a Jaguar?
It’s an aluminum casting with some hoses going hither and thither. The adjustment is made by turning the allen-head screw (5/16″ ?)which is located in the upper area of the block and a bit tricky to access (doesn’t matter if you’re blind or not—-it’s mostly done by feel).
Where are the AJ6 fault codes on a XJ-S?
On saloons it has a red connector on the end of a K/R wire under the glove box trim panel on the passenger side. On XJ-S it has a purple connector on a Y/G wire behind the centre console panel in passenger footwell. Grounding the wire for 3 seconds clears one code number at a time in order of priority.
What should the idle setting be on an AJ6?
Check idle CO – factory setting quoted as 1-2% but we find that most engines idle best with a weak setting around 1% or even slightly less depending on HC emision being stable. Run engine until fully warm. Switch off ignition. After 5 seconds switch on ignition – wait 5 seconds – remove connector from stepper motor.