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|
|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
|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|