iTEQ (DDi iTEQ) is a series of diesel engines produced by Isuzu Motors. The first engine in this range was introduced in 2004. They were installed on the D-Max pickups, as well as on the body-on-frame SUVs MU-7 and MU-X. The vehicles were equipped with the Common Rail fuel injection system.
Features of iTEQ engines
iTEQ engines are inline-four cylinder with 16 valves. All of them are single- or twin-turbo with an intercooler. Some versions are equipped with a variable-geometry turbocharger. The engine block is made of cast iron and the cylinder head is made from a special aluminium alloy patented by Isuzu Motors. The valve timing mechanism usually uses a steel chain. The plunger and barrel assembly of the fuel injectors is coated in ebonite, which guarantees a higher lifespan of the unit even if poor-quality fuel is used, and is a feature of Isuzu-branded engine injectors.
Popular iTEQ engines
| Series | Capacity, L | Version code | Max. output, hp | Max. torque, N·m | Production start | Models equipped with this type of engine |
| 4JJ1 | 3.0 | TC | 177 | 430 | 2004 | Isuzu D-Max, MU-7; Holden Rodeo, Colorado |
| 3.0 | TCX | 163 177 |
360 380 |
2006 2011 |
Isuzu D-Max, MU-X | |
| 4JK1 | 2.5 | TC | 116 | 280 | 2005 | Isuzu D-Max; Chevrolet Colorado |
| 2.5 | TCX | 136 | 325 | 2005 | Isuzu D-Max, MU-X; Holden Rodeo; Chevrolet Colorado | |
| 2.5 | 1E5-TC | 160 | 400 | 2012 | Isuzu D-Max (for Europe only) |
Common malfunctions of iTEQ engines
| Malfunctions | Engines |
| Carbon deposits build up on the EGR valve, causing it to jam. | 4JJ1-TC; 4JJ1-TCX |
| The valve clearances change over time. Manual adjustment is necessary due to the lack of hydraulic self-adjustment. | 4JJ1-TC; 4JJ1-TCX |
| The diesel particulate filter gets clogged at relatively low mileages. | 4JJ1-TC; 4JJ1-TCX; 4JK1-TC; 4JK1-TCX |
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