Loss of power

Could be maf or tps. Here are some test procedures:

Volume Air Flow (VAF) MeterOPERATION This component is used on 22R-E, 1FZ-FE, 3VZ-E and 3F-E engines.
This meter measures the amount of air flowing through the intake system. It is used by the ECM to calculate air/fuel mixture.
TESTING 22R-E, 1FZ-FE and 3VZ-E Engines
See Figure 1
Disconnect the wiring from the VAF meter.Using an ohmmeter, measure the resistance between terminals E2 and VS. Resistance should be as follows: 3VZ-E-200-600 ohms


Fig. 1: Attach the ohmmeter to terminals E2 and VS

If the test is not within specification, replace the unit.



Throttle position sensors are usually mounted on the side of the throttle body. The sensor detects the throttle valve opening angle. The voltage of terminal VTA increases in proportion of the opening angle of the throttle valve. The ECM judges the driving conditions from the input signals of the terminals, and uses them as one of the conditions for deciding the air/fuel ratio correction, power increases and fuel cut-off control. 3VZ-E and 1FZ-FE Engines
Confirm that the throttle valve is fully closed.Connect an ohmmeter to terminals IDL and E2. E2 is the bottom terminal, while terminal IDL is positioned directly above it.
Insert a 0.020 in. (0.50mm) thick feeler gauge between the throttle stop screw and lever. Check for continuity between terminals IDL and E2 of the sensor. Continuity should be present.Insert a 0.031 in. (0.80mm) thick feeler gauge between the throttle stop screw and lever. Check for continuity between terminals IDL and E2 of the sensor. Continuity should not be present.

have the fault codes read as it may be a combination of faulty sensors causing the problem. The ECM fault reporrting process is there for a purpose and that is to pinpoint the fault and to save money.

Go and have the computer scanned for codes. Go from there, otherwise you are just firing the parts cannon at the problem.....

Sounds like your fuel filter is getting clogged up. Get that changed and it will be fixed. Should be an easy, cheap fix. Hope this helps, James Booth :))

have it scanned for codes and i suspect youll find a faulty mass air flow sensor or knock sensor.

check the o2 sensor if thats not it something maybe blocking your intake and if thats not it then it could have something to do with the computer (ecu) check the cables that connect to the ecu cause my moms cadillac had the same problem so just disconnect the ecu plug it back up

had similar problem easier to replace air mass meter and filter approx £45

lets start with the heating up problem!
replacing the thermostat and relay has nothing to do with it. common causes of heating up are improper valve setting timing, mismatch air-fuel ratio, worn-out piston rings, poor oil flow, poor radiator coolant flow.
i suppose you have changed your car motor oil. recheck if its on the right amount.


loss of power:
Common Causes
loose piston rings (causing insufficient compression: indications fog like smoke), air-fuel ratio incorrect, blockage in air intake.

check also for air on the fuel hoses if you experience often jurking problems regularly clean fuel strainers or filters.

which is standard or the best motor oil for HDI?

air flow meter