Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1987S10/T10 P/U 2WD L4-151 2.5LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESDIAGNOSIS BY SYMPTOMHESITATION, SAG, STUMBLE
1987 Chevrolet S10/T10 P/U 2WD L4-151 2.5L
Hesitation, Sag, Stumble
1987 Chevrolet S10/T10 P/U 2WD L4-151 2.5LSECTION Hesitation, Sag, Stumble
Condition defined as momentary lack of response as accelerator is depressed. May occur at any vehicle speed, usually most severe when moving away from stop. Check the following:
1. Incorrect fuel pressure or contaminated fuel.
2. Air leaks between manifold and throttle body. Fouled spark plugs or faulty secondary ignition system components.
3. Binding or sticking TPS. TPS voltage should increase at steady rate as throttle is opened.
4. Incorrect ignition timing. Check initial adjustment, EST and ESC, as equipped.
5. Improper charging voltage.
6. Poor HEI system ground.
7. Improper canister purge operation. Refer to canister purge valve diagnosis chart.
8. Improper EGR system operation. Check EGR valve operation and if satisfactory, refer to applicable diagnosic chart.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.