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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC1999FORWARD CONTROL 4.3 W, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURESBASIC IGNITION SYSTEM CHECKSDIS (EXCEPT 3.4L)IGNITION COIL TEST (2.2L, 4.3L, 5.0L, 5.7L & 7.4L)
1999 GMC Forward Control 4.3 W, Standard
Ignition Coil Test (2.2L, 4.3L, 5.0L, 5.7L & 7.4L)
1999 GMC Forward Control 4.3 W, StandardSECTION Ignition Coil Test (2.2L, 4.3L, 5.0L, 5.7L & 7.4L)
- Turn ignition off. Remove engine cover. Disconnect wiring from ignition coil and distributor lead.
- Using DVOM, check for continuity between coil primary terminal and exterior case of coil (ground). Replace ignition coil if continuity is present.
- Using DVOM, measure resistance between coil primary terminals. Replace ignition coil if resistance is not 0.1 ohm.
- Using DVOM, measure coil secondary resistance. Replace ignition coil if resistance is not 5000-25,000 ohms.
- Reconnect distributor lead and wiring to ignition coil. Install engine cover.
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.