iTEQ (DDi iTEQ) is a range of diesel engines from Isuzu engines. The first engine of this series was introduced in 2004. They are fitted in both the D-Max pickups and the MU-7 and MU-X body-on-frame SUVs. The vehicles are equipped with a common rail injection system.
Features of iTEQ engines
iTEQ engines consist of 4-cylinder in-line engines with 16 valves. All have a single or twin turbo with intercooler. Some versions have a variable geometry turbocharger. The engine block is made of cast iron and the cylinder head is made of a special aluminum alloy patented by Isuzu Motors. The valve control unit usually uses a steel chain. The injectors' pumping element is coated with ebonite to give the unit longer life even when the fuel quality is poor and distinguishes Isuzu engine injectors.
Popular iTEQ engines
| Series | Displacement, l | Version index | Max. Power, hp | Max. Torque, Nm | Year of manufacture | 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) |
Frequent Defects of iTEQ motors
| Defects | Motors |
| Carbon builds up on the EGR valve, causing it to bind. | 4JJ1-TC; 4JJ1-TCX |
| 4JJ1-TC; 4JJ1-TCX | |
| The diesel particle filter clogs at comparatively low mileage. | 4JJ1-TC; 4JJ1-TCX; 4JK1-TC; 4JK1-TCX |