AUX FORD CAPRI 1974 Workshop Manual
Page 79 of 205
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78 Chapter 3 FlIer and exhaust systems
TIlls system, when comp1lrcd with conventlon,lI c.Jrhwctlo, ~rrilngemen1s. <lchicves <l mOIO IlccUl.1te control 01 lho <Jil/fuel mi~l\l,e resul ting in ro(tuccd omission levels and improved prcrforrllilnco . The 'llllln coml>oncms of tho fuel inrcclton system lall into three
tI'(lllPS
A FI/ef Milk Fuef Plllllf! F/lel .?CCIIIIW/<1IOI Fuel filler F/lel ,IISltihular ,w(/ millime con/rol l11ralllc MIlllll/ce/Of "',1/1'115 AI( ch.ll11/"1(
B W<lIIII 'IIIJ wyu/,1/()r AIIII,{Wty .1;r (/I:VJc.' Simla! ",MH' 7 hCIIII<J/mifi SWitch
C Wilil/[I Hd,.ys SMt'ly SWitch
The fuel pump IS 0 1 eh,CIIICtllly operated. ,aile. cell Iyp" A .",SS (IIC rchd ..,:,1..,0 'S mco,p[)I;oh~(1 III the pwnp 10 preY",l! f:XCOSSlvn
p"'SSUIC la"ld III) '" tho event of ,1 ,,)Sl"Ctlon III th e pipelollf!s The fuel ,I(:c\llllula lor ha~ 'wo lunf.luItlS. (t) In 4'ill1I,)(:I1 llll! IIIII,,;,'U)!l 0 1 lhe luclllow. HHlu.:.iI ,ml hy Ihe I)\I"'P ;IIIf' (II) 10 11I;""t,"" Iud I"'"'~''''' ,,1";1 .h" .:o,!.m" h;os Iom,n sw"dn,,' "If TillS p.r.v"rlls .• v; 'po", IIH:1o; .lo.:vel"I'III!1 w,th t:'Hlf.O:'I""nt 100' ~t,'<tIllU plohl"",s The f'lcl filter '1I1:"'I'OO;lleS two l"ll,e. 1,111" "Imlllllits to ""SU'" th,lt lhe '",,1 1!!,uoOh,,,!) 11,,: 11O)I:ctrrJl) syst,,111 comp"""lIIs IS "UUII'I"I"ly flce hom tlo.l The fue l distribulor/mi.l!ture control Msemb ly . The Iud dlsl"bulor C0I111ols Ihe '11I,lntl 'y of fuel bein!1 dehveled 10 tho CII!)Hle.
OIlS""l1g .h'lI each cylrndo. fCCOlves Ihe same ;lII1OtUlI. TIlt! mlxhlW COIII.ol aSSemhly ,ncorpo'illes ,III IIi, senso. pl, 1le ;m d cOlllml plllll(le •.
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The iI" sen~or 1)1"le is locilled in 'he main nIl Stlealll be.ween the iI'r clr:wller ,1nd the Ih'Ol\Io bullerfly. Du'ing idling. the ~irflow hits Ihe sensor plate which in tu.n '<lises a contrOl pluiloer which nHows fuol.o How P.1St tho plunger and oul of Ihe injeclor v.llves. lnC/ease s in enornn speed cause inC/eased air flow which ,aises the conlfol plulIge, "nd so admits mo.e fuel. Tho throttlo valvo assembly ;s moun led in .he rIl<lUI all ;nlilke hetween tlte mixture contrOl ,1ssembly arid Ihe ai. challiber. The Ihrollie villvo plate is cOlltlOlied hy a cilble connected to Ihe ilccelerntor podOll The injector valves a.e located in the Inle! 1I1o111110ld "nd OlIO dt.!sl{jllod '0 01)0011 ill a fuel pressuro of 3.3 kof/cm' (46. 9 Ibf!III'). T he air Chiltllber is mounted on thO top of 'he ell!Jlno iln.t fUllctlons ,1S an a"xlhillY inlet nWllifold dllcctill!J arr horn the sensor ,,'011(1 '0 e,1ch indIvidual cylinder. The wilrlll'up rogula tor IS 10f.il1Cd 011 Ihe I,ont of the CnU,"e ;01,,1 '"f.orpur"tcs il hi·met,.1 st.ip. VilCUUlIl di"llh.,IUI11 and cOl11lol Villv!! Th" funcI,oll 01 the ronulato. 'S to enri ch tho lucl/a" n".IUlf) Ih",no lire W,II'" III) Ptillod ;md iI'SO:ll lull thmttlo Of1"Clallon . Tho auxiliary iii, dovice IS locaterl nil tlln Iron! f.If." "I Ih" "" dlilnll ..... r. II ,:ons,sts of a Ilrvoted plil'o. h, ·metal Slrrll ,),1(1 h,,;,ter 1:011 Til" PU'P IIS" 01 IIIIs tlcvlce IS to supply an PI'crcOl~"d vnhlllw III 1""1/",, 11"'1",(1 dl"Pl1!J cold idling r~llltcr 51111i1011 to Ihe 101,,1 1111" sy~h,m Orr 1:,)lIIIII"IIOII;,yoIJIS Ti,e fuel sta.1 valvo is locillud 011 the l]Iall l;,1f dl,II""!!' iI"" ", all ,,1o.."(:tllc.llIl' tlt)C,,,tcd 1111')(;10' , lIS PIII I)()SO IS 10 SIJI.ly fudrrllO ti ll! ,111 r .... '. ;'1 ,;,,111 ~'~rrt"'!J ThiS Iud tomcs II"m 'ho fuel ,r. :.t"IUIIO' ,lilt' IS oIlo"'If,·d III II", ,III Ch;II))I,,,. wllh an frOIlI Ih..., auxllo;II Y ,1" d...,V,4·" Tho TI", .. I110Iil}10 switch IS sl:'(lwod Into Ihe (:lltl "U) mll.1CCI't lu lit!! wa'lIIup 11'\)111,110' Th(l SWItch ,IICOIPO(.1I1.'S" COIII;tCI ~Ill. ""lIIcl~1 ~I"p .",,1 IWO h(:iltcd elmn(:ms The switch comrors thc sta.1 v,llve by hl'llIlIllI the PCIIO<i 01 fuel in)CCllO'1 frOIll Iho valve anti ill$o pr(:vellllllU ti,e valve frOIll IIllcc"ng any luel ilt all when sta,',ng a hOI cngule. Electrical re'ays and luses. These a.e loc,, 'cd undc. the faci" p;IIIIJI Oil tlte ri!)ht·hilnd sj(lo on Ihe intc.io. 01 Ihe C'If. Tho .()I,1yS cnlllp.bo Ihe 111;1111 contrOl foray and [hn powef SIJpply '01,1y.
Fig. 3.32 Fue' injOCliOrl system flow diagralll (Soc 22)
1 Flle/lall/(
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Mu;/ulc CUIIIIOI ,mif 6 IIIIOlfic pla/c assembly 10 S/;II/ villve 2 Fuel PIIII/I' 5., Fucl (Iistllbutor 7 Inicc/or valvc /I 'hell1JOlimc sw,lch 3 Fuel i'CC/IIIIUI"tul 50 Alf SCIISOI 8 WiJllII·Up regula/or 4 Fuel '"10:1
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Plcssule regtllillQI 9 AU~IIt"aIY air device
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Page 87 of 205
Symptom
Engine will nOt Slnr1 (HOT)
Engine will not stal! (COLO )
Engine mIsfires on rond
Unsatisfacto,y ,oad p edomlilnce
Rough Idling (ilIWilYS)
Rough rdllng (during warm -up)
Excessive fuel consumptIon
nglne fUns on
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C hapte r 3 Fuel and exha ust systems
Reason(s)
AuxiT inry air device not clOSing
Auxilimy ai, dev ice nOl opening SImI villve filulty Thermotime switch nOt closing
L oose fuel pump elec trical connections
System fuel presswe incoflec!
M,xture adjustment incorrect
AUKlhilr y ili, deVIce nOt OllC,ahng cOflec tly
Mixture M1ts utment incolleci leak in system fuel lines
Airtlow sensor plate or cont/otplunger not moving "eely Injector villves leakinU or then OJ)Cnlng pressure too low
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