Misfire Under Load - (Bad Plugs, Wires or Short to Ground) Pinpoint Test G
Ignition Systems, Timing Procedures and Diagnostics 13-115
2.3L EFI Truck (Dual Plug) DIS
Misfire Under Load
Pinpoint Test G
(Bad Plugs, Wires or Short to Ground)
PRELIMINARY NOTES
The engine analyzer is used to diagnose problems in the secondary side of the ignition system.
CHECKOUT
^ Visually inspect the engine compartment to ensure all vacuum hoses and spark plug wires are properly routed and securely connected.
^ Examine all wiring harnesses and connectors for insulation damage, burned, overheated, loose or broken conditions.
^ Be certain the battery is fully charged.
^ All accessories should be off during diagnosis.
EQUIPMENT
Obtain the following test equipment or an equivalent:
^ DIS Adapter Rotunda (Rotunda 007-00044).
^ Engine Analyzer, Rotunda 002-00550.
13-116 Ignition Systems, Timing Procedures and Diagnostics
2.3L EFI Truck (Dual Plug) DIS
Pinpoint
Misfire Under Load
Test G
(Bad Plugs, Wires or Short to Ground)
NOTE: If this portion of the diagnostic procedure is to provide accurate results, it is essential that the calibration of your engine analyzer be maintained. Refer to your equipment manual. If this is not available, an estimate of the calibration can be made by connecting the spark tester (D81P-6666-A or equivalent) to a properly operating ignition system and measuring the firing voltage of the spark tester only. Do not include the firing voltage of the rotor-to-cap gap. The spark tester firing voltage should be approximately 28 KV.
Ignition Systems, Timing Procedures and Diagnostics 13-117
2.3L EFI Truck (Dual Plug) DIS
Pinpoint
Misfire Under Load
Test G
(Bad Plugs, Wires or Short to Ground)
13-118 Ignition Systems, Timing Procedures and Diagnostics
2.3L EFI Truck (Dual Plug) DIS
Pinpoint
Misfire Under Load
Test G
(Bad Plugs, Wires or Short to Ground)
Ignition Systems, Timing Procedures and Diagnostics
13-119
2.3L EFI Truck (Dual Plug) DIS
Pinpoint
Misfire Under Load
Test G
(Bad Plugs, Wires or Short to Ground)