I have a '92 2.6L 4cyl 5spd Isuzu Spacecab with the same symptoms noted below. Through a two day series of inspections by my mechanic, it was found that there was a vacuum leak on the number 4 intake runner. The O2 sensor was malfunctioning, and truck was consuming gas similar to an 8 cylinder. In addition, the thermostat was also faulty. There was often no power, very sluggish, and often stalled out. The problem was diagnosed with a smoke test. The required repairs have led to the indefinite parking of this truck.
Tuesday, May 22nd, 2007 AT 10:48 PM