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.
Test NF-14A - No Fault Code Mechanical Test
1993 Chrysler LeBaron LandauSECTION Test NF-14A - No Fault Code Mechanical Test
NOTE:
If coming to this test from O2 sensor test and rich or lean condition is not corrected after checking items listed below, replace Powertrain Control Module (PCM).
At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a driveability problem. Following additional items should be checked as possible causes:
- Check if any TECH SERVICE BULLETINS (TSBs) apply to vehicle.
- Check engine compression.
- Check for exhaust system restriction.
- Check camshaft and crankshaft sprockets.
- Check valve timing.
- Check torque converter stall speed.
- Check engine vacuum. It must be at least 13 in. Hg in Neutral.
- Check for fuel contamination.
- Ensure PCV system is functioning properly.
- Ensure injector control circuit is connected to correct fuel injector and injector is not plugged or restricted.
- Check power booster for internal vacuum leak.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.