The Detroit cylinder 2 misfire troubleshooting sheet documents Detroit fault code SPN 1324 FMI 31, which sets when cylinder #2 is exhibiting a misfire event. This 3-page PDF belongs to the Detroit DD Series (EPA 2007-Current) DTC library and guides a technician through the confirmation and repair sequence for the code. It is drawn from Detroit Power Service Literature and republished by TruckFaultCodes.com (2017).
The document lists the entry conditions and common causes — cylinder kit, valve train, lash adjustment, fuel injector or high-pressure fuel line — then walks through a Relative Cylinder Compression Test, an Idle Speed Balance (ISB) reading at idle, and a high-pressure fuel line inspection to decide between a mechanical repair and injector replacement.
Detroit cylinder 2 misfire document details
| Brand | Detroit |
| Model coverage | DD Series (EPA 2007-Current) |
| System / Group | Diagnostic Trouble Codes (DTCs) |
| Fault code | SPN 1324 FMI 31 |
| Source | Detroit Power Service Literature |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code description and entry conditions
- Common causes (cylinder kit, valve train, injector)
- Multiple-code check
- Relative Cylinder Compression Test
- Idle Speed Balance (ISB) reading
- High pressure fuel injector line inspection
Applicable truck models
This fault code troubleshooting procedure applies to Detroit DD Series engines built to EPA 2007 and later emissions standards, covering all model years within the DD Series DTC set. Use it alongside a diesel diagnostic tool such as DiagnosticLink or ServiceLink to read live data and confirm the code before any parts are replaced. For engine coverage and official service resources, visit the Detroit Diesel official website.
Who needs this Detroit cylinder 2 misfire manual
Fleet technicians, mobile diesel mechanics and workshop owners rely on this reference before opening the SPN 1324 FMI 31 code with a scan tool. Following the documented sequence avoids replacing good parts and clarifies whether the concern lies in wiring, a sensor, or a mechanical component.
The full SPN 1324 FMI 31 PDF is available in the DiagTechPro manuals library; a free account is required to download.
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