Hi All,
My Rodeo with a 2.6 l 4ZE1 fuel injected engine runs rough not long after it has started up-barely warmed up to operating temp. I've done the various tests that the after market workshop manual suggested. It does not idle properly-sounds like it has a cylinder out, it has a flat spot and seems to have a cylinder out up to about 2700-3000 RPM, above this seems ok-(stationary) On test drive it breaks down under load. So far, I have removed and cleaned the fuel injectors and fitted service kits, replaced the Throttle position sensor and set correctly, replaced the crank angle sensor and timed distributor/timing, adjusted valve clearances correctly,and replaced the oxygen sensor. All have made variously good improvements. I carried out a voltage check on the Mass Air Flow meter and when the engine began running rough the signal voltage at the MAF meter dropped and so I have just replaced the MAF meter with no improvement. I have checked and ensured that the ECU is grounded at the mounting bolts. I cannot find a plug to try and get codes. Does anyone have any clues as to what it could be causing these issues please?
Cheers.