11
EMISS]ON ONTROL YSTEM 21-125 20 Pooracceleration lack ol power Descrip- tion Lack of power on acceleration Lack of power at full hrottle Lower maximum ehicle peed ldling peed s normal Cfroubleshooting int) O Factors xcepl engine mallunction @ lr Clutch lippage Brake dragging Lack of tire air pressure lmproper ire size Overload o o @ M O L ' €ufficient ntake air Throttle alve does nol open ully Intake ystem clogging verlean airlfuel atio alfunction f ignition )w engine compression ressure Step Check Remedy 1 Ar e he ollowing actors OK? - Clutch lippage - Brake dragging - Lack ol lire ai r pressure - lmproper ire size - Overload Yes Go to nelt slep. N o Bepair. 2 l s throttle alve open ully when depressing accelerator edal ully? Yes Go o step 5. No Go o next step. Check orrect nstallation f throttl e able. Yes Go o nelt step. No Repai r r replace hrottle able. 4 Check orrect operation l throttl e ody. Yes Go to nexl step. No Repair r replace hrottle body. 5 Check EGRvalve operation hile engine s idling. Yes Go o nen step. No Check he EGR solenoid alve. o Check hat malfunction ndicator ight s illuminated hile gnition witch s ON. Yes Malfunction ndicator ight s illuminated. Check or causes. Refer o Troubleshootino with OBD-tl Diagnostic Ttouble Codes. No Go o next steD. 7 Check amshaft osition ensor nd connector. Yes Go o nelt step. No Check amshaft osition ensor and related wirehamess. a Check hrottle oosition ensor. Voltage between terminals: ldling condition: V maximum Throttle valve ully open: approx. 4V Yes Go to neld slep. No Reolace hroftle alve. 9 Check acuum n intake manifold hile enoine s idling. Vacuum: more han 17.7 nHg 45 0 mmHg) Yes Go o next steo. NO Check ai r leakage t intake ystem an d 10 Disconnect njector onnector ne by one while engine s dling. s here n equal ngine peed decrease or each cvlinder? Yes Go o next step. N o Check njectors. Relet o Fuel System, section 2. '11 Check leanness f air cleaner lement. Yes Go o ne n step. N o Replace ir cleaner lemenl. Revision 1 8i/15/99
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