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78 Chapter 3 FlIer and exhaust systems
TIlls system, when comp1lrcd with conventlon,lI c.Jrhwctlo, ~rrilngemen1s. 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
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,'
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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9
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 '
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
"'
Plcssule regtllillQI 9 AU~IIt"aIY air device
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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
I
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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