Nissan SR20DET Firing Order and Coil Diagram
Nissan SR20DET Firing Order and Coil Diagram with 1-3-4-2, physical numbering, identification cautions and routing procedure.
The SR20DET Inline-Four firing order is 1-3-4-2. Cylinders count 1-2-3-4 from the timing-chain and crank-pulley end toward the transmission.
The SR20DET Inline-Four firing order is 1-3-4-2. Cylinders count 1-2-3-4 from the timing-chain and crank-pulley end toward the transmission. A firing order is the sequence in which the cylinders begin their power strokes. It is not the same thing as cylinder numbering, distributor-cap clock position, or ignition-coil connector order. Confusing those references can create a no-start, violent backfire, dead cylinders, or a diagnostic trail that looks like a fuel or mechanical problem.
Use the verified order only after identifying the engine family and camshaft. Classic engines can accept camshaft swaps that change the required sequence, while modern coil-on-plug engines have no distributor cap to route. The table, bank diagram, and procedure below keep those concepts separate and show how to confirm No. 1 on compression before moving any wires.
Interactive Nissan SR20DET Inline-Four firing-order diagram
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Select each cylinder to walk through the firing order. Cylinder-bank numbering and distributor direction must match the identified engine family.
Nissan Sr20det Firing Order
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| Firing order | 1-3-4-2 | Confirm exact engine |
| Physical numbering | Cylinders count 1-2-3-4 from the timing-chain and crank-pulley end toward the transmission. | Orient by the timing/front end |
Identify S13, S14, S15, GTI-R or other donor configuration before following connector details. Swapped engines often combine harnesses and ECUs, so verify commanded coil channels instead of relying on wire color.
Which SR20DET Inline-Four firing order applies?
Covers the mechanical order shared by common longitudinal and transverse SR20DET variants; ignition hardware varies by chassis. This distinction matters because the engine can look nearly identical from above. Treat the camshaft or engine assembly as the authority when parts have been mixed. A firing order cast into an intake, copied from a generic decal, or remembered from another V8 is not enough to identify a modified engine.
The application table separates the order, cylinder banks, and ignition-system notes. Read all columns before routing. The first number in 1-3-4-2 is cylinder 1, but the physical No. 1 terminal can appear in different clock positions when a distributor has been installed on a different gear tooth.
Bank numbering and verification on the SR20DET Inline-Four
Identify S13, S14, S15, GTI-R or other donor configuration before following connector details. Swapped engines often combine harnesses and ECUs, so verify commanded coil channels instead of relying on wire color.
Identify S13, S14, S15, GTI-R or other donor configuration before following connector details. Swapped engines often combine harnesses and ECUs, so verify commanded coil channels instead of relying on wire color.
Nissan SR20DET Inline-Four specifications can change by model year, engine, platform, wheel, and installed component. Confirm the VIN or engine identity, part numbers, fastener condition, and the current manufacturer instructions before service.
Procedures used with this specification
These steps are the same for every vehicle in this family, so they are documented once rather than repeated on each page. The values above remain specific to this Nissan SR20DET Inline-Four.
Nissan SR20DET Firing Order and Coil Diagram FAQs
What is the nissan sr20det firing order?+
The SR20DET Inline-Four firing order is 1-3-4-2. Cylinders count 1-2-3-4 from the timing-chain and crank-pulley end toward the transmission.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
1Nissan S13 SR20DET factory service manualFactory S13 service-manual reference for the longitudinal SR20DET engine and its ignition system.↗