Question about 2002 Buick Century

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02 buick will not rev up has no power have run on scanner no codes have unhooked converter changedfuel pump changed air flow meter changed tps also new computer have run into brick wall please help

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  • jwshowalter Sep 16, 2010

    I have checked the fuel pressure and it is about 50psi and the fuel filter is new. When i try to rev the motor it gets to a certain RPM then just surges up and down and it makes some rather strange wooshing and sucking sounds. It also seems to be running quite lean, the plugs are very white.

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Release tension on the serpentine belt revove belt start engine and see what happens more than once i have seen a belt driven component cause the same thing without being detectable hence a smoking belt squelling bearing noises none of these were present yet when belt was released problem was gone one was an a/c clutch hub one was alternator neither could be heard just thought you might try have also seen a mass air meter cause this without setting a code i can only assume you have covered all basics has actual fuel pressure been checked at the fuel rail there is a test port also a severely clogged fuel filter if pressure is issue generally under engine data on scanner your o2 sensor readings will be right at border line lean and quick snap of throttle does not iniate a sharp response hope this may help

Posted on Sep 16, 2010

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Posted on Jan 02, 2017

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1991 toyota 4runner 3.0 v6 cuts out under load


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

3d23f7f5-25ac-415e-bb30-8a2de44707c6.gif
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.
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My ed falcon 5.0l runs but won't rev & lacks power Have replaced air flow meter as it runs better with it did connected Checked computer for damage & condensation & foreign debree But can't find the...


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.

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you need to have an OBDII code scanner to read the error codes or codes for the check engine light being on. sounds like the mass air flow(maf) sensor is the culprit. also possible is either the throttle position sensor(tps) or idle air control(iac) valve. the OBDII code scanner will tell you in a PXXXX error code to help you pinpoint the problem. (the XXXX is the numeric error code and the P stands for powertrain.

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The TPS must be set with a voltage meter. What are the code numbers? Air flow meter will not let it idle too. Get a used one to save you money. Be sure you do not have the ecm number 1228253 in it also,they will make the car shut off while driving. I have one of the cars with 295,000 miles on it.

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ONLY WORKS WHEN THE AIR FLOW METER IS DISCONNECTED


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