Parts for your 1989 Mitsubishi Pajero-Ignition coils

1989 Mitsubishi Pajero ignition coils — what’s fitted and how to look after them

Based on technical references including the Mitsubishi Pajero Factory Service Manual (1989 model year coverage), the Mitsubishi 4G54 and 6G72 petrol engine service information, the 4D56 diesel engine manual, and widely used workshop guides (e.g., Haynes/Pitman manuals for 1983–1991 models), ignition coils are fitted to the 1989 Mitsubishi Pajero when equipped with petrol engines (2.6L 4G54 inline‑four and 3.0L 6G72 V6). These use a single canister‑style coil feeding a distributor. For 2.5L 4D56 diesel variants, an ignition coil is not used because diesel engines rely on compression ignition and glow plugs rather than a spark system.

For petrol‑powered 1989 Pajeros, the ignition coil is a key piece of the spark system. It steps up battery voltage to the thousands of volts needed for a strong spark at the plugs, with the distributor routing that spark to each cylinder. When the coil gets tired, owners may notice hard starting when hot, a stumble under load, rough idle, or a complete no‑start if the coil fails outright. The factory literature advises checking coil resistance against spec and inspecting for cracking, oil seepage from the canister, heat discolouration, or loose terminals.

While coils aren’t a scheduled replacement item, they benefit from periodic checks during regular servicing. Good practice includes:

• Inspecting the coil body, bracket and the high‑tension lead to the distributor for cracks or corrosion.
• Ensuring clean, tight electrical connections and a solid earth.
• Testing primary and secondary resistance against the service manual specs if misfires or weak spark are suspected.
• Avoiding prolonged key‑on/engine‑off time, which can overheat older coils.
• Keeping water and degreaser off the coil and cap when washing under the bonnet.

Replacement is straightforward: disconnect the battery, label the terminals, swap the coil, and fit a new coil‑to‑distributor lead if the old one is brittle. Choose a quality coil matched to the Pajero’s electronic ignition and distributor system for the 4G54 or 6G72. It’s also smart to check spark plugs, leads, distributor cap and rotor at the same time—weak components upstream or downstream of the coil can mimic coil failure. Left unattended, a failing coil can cause persistent misfire, poor fuel economy and, on petrol models with emission gear, potential catalyst damage. A quick test and a fresh coil when needed keeps the old Pajero starting cleanly and pulling strongly across Aussie and Kiwi roads.

Note for diesel owners: 1989 Pajero 2.5L 4D56 diesels don’t use an ignition coil. They use glow plugs and a timer/relay for cold starts, as detailed in the 4D56 engine manual.

FAQs

Does a 1989 Pajero diesel have an ignition coil?
No. The 2.5L 4D56 diesel is a compression‑ignition engine and uses glow plugs instead of a spark system. There’s no distributor or ignition coil fitted, starting assistance is handled by the glow plug circuit.

How often should the ignition coil be replaced on a 1989 Pajero petrol?
There’s no fixed interval. Coils are replaced when testing shows they’re out of spec or if there are symptoms like misfire or no‑start. It’s sensible to inspect and test the coil during major services and any time the cap, rotor, leads or plugs are renewed.

Can a failing coil damage other parts?
Yes. A weak or intermittent coil can stress the igniter/module and lead to sustained misfires. On petrol models with emission equipment, unburnt fuel from misfires can overheat the catalytic converter. Sorting the coil early helps protect the rest of the ignition system.