Jaguar World – July 2019

94 |JaguarWorld/July 2019

QUESTIONSANDANSWERS

CourtesyofSealeyProducts(www.sealey.co.uk; 01284757500 ),thesenderofeachissue’sStarQuestionwillbetheenvyoftheir

friendswhentheyreceiveanaluminiumadjustable-focus3wLEDtorch(worth£28.74Inc.VAT).The‘LED020’producesanextremely

brightwhitelightwithanoutputof1 10 lumens–countthem!Theilluminationpatterncanbealteredfromspotlighttowidearea

withasimpletwistingactionoftheheadandathree-functionon/offpush-buttonprovidesfull,halfandblinkinglightpossibilities.

AllthisiscontainedwithinalightweightaluminiumhousingandispoweredbythreeAAAbatteries(notincluded).

20-minute

XJ40

Q

MypreviouslyreliableV1 2

XJ40hasdevelopedafaultthat

rendersituselessasameansof

transport.Whenstartedfromcold,it

willrunforalmostexactly 20 minutes,

thencutoutandrefusetorestartfor

acoupleofhoursuntilithastotally

cooleddown.Theprocessthenrepeats.

Iwastoldthatthesecarsfrequently

sufferfromcrankshaft-positionsensor

faults,sowasverypleasedwhenI

foundthesensortobephysically

damaged.Iwassomewhatlesspleased

whenitsreplacementmadeno

differenceatalltotheproblem.

Ihavealsoeliminatedtheamplifiers

bysubstitution.Anyideas?

JanCremer,Netherlands

A

Whoeveradvisedthepotential

crank-sensormaladywas

probablyontherighttrack,but

failedtomentionthattheseMarelli-

ignitedcarsemploytwosensors.

Thefrontone(thatweassume

youreplaced)isconventionally

mountedadjacenttothecrankshaft

damper.Itspartnerisfoundatthe

lowerrearoftheengine,attached

tothealuminiumtorqueconvertor

undershield,takingitssignalfrom

thedriveplate.Thesesensorsare

currentlywidelyavailable,under

partnumberDBC12508,foraround

£40,makingitssubstitutionan

economicmove.

Intheunlikelyeventthatthisdoes

notsolvetheproblem,turnyour

attentiontowardsthefuelpump,

whichmaybefailingwhenwarm.

However,thisisusuallyaccompanied

byaroughwhiningnoise,whichyou

shouldeasilybeabletohear.

Jaguar World's

technical adviceservice

EditedbyRayIngman

SofterXKR

Q

Ihavea2 01 0modelXKRwith

50kmiles,ingoodconditionand

withfullservicehistory.Itisa

fabulousandbrutallypowerfulcar,but

therearetwoissuesIfeelarenotquite

rightthatnoneofthelocalexpertshave

beenabletohelpwith.

Firstly,thesuspensionisverystiff.

Beingafullyactive,computer-controlled

system,I’mhopingitshouldbepossible

tore-programitforasofterride.

Secondly,roadnoise:Irunnewtyres

(MichelinAcoustic,255/35and285/30)

on20inNevisrims.Theroadnoiseat

normalhighwayspeedsisdisturbingly

prominent.IhadContinentalContiSport

Contacttyresbefore,andtheywere

louderstill.BeingaluxuryGT,Ibelieve

theroadnoiseshouldnotbeworsethan

onamid-rangesaloon,forexamplea

VWPassat.

Anyadviceyoucanprovidewillbe

highlyappreciatedandservetomakea

greatcarevenbetter.

StefanEklund

STAR

QUESTION