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 MANUALSPLYMOUTH1984HORIZON BASE, 1.6 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 18 (TRAVELER MODULE)DIAGNOSTIC CHARTSTEST 1E - TESTING MILEAGE & DISTANCE PROBLEMS
1984 Plymouth Horizon Base, 1.6 A
Test 1E - Testing Mileage & Distance Problems
1984 Plymouth Horizon Base, 1.6 ASECTION Test 1E - Testing Mileage & Distance Problems
WARNING: This page is about a different car, the 1994 Plymouth Acclaim, 1994 Dodge Spirit, and 1994 Chrysler LeBaron. However, it is still accessible from the selected car via links, so may be relevant.
- Using DRB, read Powertrain Control Module (PCM) monitors. Observe TPS when throttle moves. If TPS percent doesn't change with throttle open, see TESTS W/CODES - 2.5L FLEX FUEL article or the TESTS W/CODES - 3.0L article in ENGINE PERFORMANCE section. If TPS percent changes as throttle is open, go to next step.
- Raise and support vehicle. Start engine and shift vehicle into Drive. Using DRB, read PCM monitors. Observe VSS while wheels rotate. If MPH does not increase as throttle is opened, refer to appropriate TESTS W/CODES - 2.5L FLEX FUEL article or to the TESTS W/CODES - 3.0L article in ENGINE PERFORMANCE section. If MPH increases as throttle is opened system is operating properly at this time.
RENDER: 1.0x
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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.