Question about 2004 Isuzu Rodeo

2 Answers

Reduced performance and "Reduced Engine Power" dummy light is on.

I have already replaced the throttle body, and the only noticeable difference it made was in my bank balance.  So, (I'm told) that the problem MUST be in my mass airflow sensor.  Is there a way to test this unit OFF the vehicle with a multi-meter or a jack-hammer or something??? 
Please feel free to call directly at (808) 723-4288  Warren

Posted by on

  • drzera Jun 19, 2009

    i dont have a code reader.  is there another way to test the MAS?
    Also, how do i test the catylitic converter??
    does the catylitic conv need to be on (mine has been removed by previous owner) in order to run well?

×

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Isuzu Master
  • 3,433 Answers

The MaF sensor is inexpensive and easy to chage.

If you are having power problems more than fuel problems, check your exhaust at the tailpipe for the smell of sulpher andwheezing. The exhaust should stop the minute the engine is shut off. Using a tissue you can pick up any exhaust movement after shutdown, Like a real low draft. If so, Consider having the catalyctic converter chk'd for restriction. When they plug up the engine can't breath and loses its power. The MAF sensor cause eratic idling and jerky acceleration.. It's the first sensor in the duct coming out of the air cleaner. Good Luck. - Ned

Posted on Jun 18, 2009

  • Ned C Cook
    Ned C Cook Jun 19, 2009

    Warren, The maf sensor can be cleaned. using carb cleaner spray rinse out all the orifices . do not fill holes or let it collect . Just flush the dirt out. Maf sensors run around $100 so the dealers include cleaning it on their tune ups. My error i Your Cat converter is part of the emmissio control system and it missing will be picked up on a smog test. Functioning properly it won't affect the cars performance. So, it would be wise to have it replaced at a muffler shop.The MAFis a stationary part , a tube the air cleaner duct is connected. It's only about 5 in log. and looks like it has a horn in the middle of it.. a velocity tube..Just clean it.- Ned

×

Ad
  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 16 Answers

Get a code reader and see if there is a problem

Posted on Jun 18, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

I have 2008 chevy Impala 3.5l v6 Vin K an I have tried everything to fix the vehicle the check engine light comes on dash says engine power is reduced an runs fairly rough


Hi Christopher.
Have you tuned up the engine? Changed spark plugs, wires, and air filter? Another possibility is you may have some water in your gas and/or partially plugged fuel injectors. Pick up a bottle of fuel system cleaner with water remover at your local parts store and pour it into your gas tank on your next fill-up. If there is water in your gas and/or partially plugged injectors, you should notice a difference in engine performance in about a day or so, depending on your driving habits. Hope this helps. Let me know.

Jun 18, 2017 | Cars & Trucks

1 Answer

Check engine light reduce engine power and traction controll off.


It could be the APP sensors or the throttle body throttle position sensors . What DTC'S - diagnostic trouble codes . Need to test the electrical wiring , 5 volt reference voltage. Drive by Wire Function and diagnostics by Wells
REDUCED ENGINE POWER - mass airflow sensor has nothing to do with this problem .
Throttle Actuator Control (TAC)
Reduced Engine Power Mode When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
?€¢
Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.


?€¢
Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.


?€¢
Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.


?€¢
Forced idle mode--The control module will perform the following actions:


-
Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.


-
Ignore accelerator pedal input.


?€¢
Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.




Refer to
?€¢
Powertrain Control Module Description for the 4.8L, 5.3L and 6.0L engine


May 09, 2016 | 2006 Chevrolet Avalanche

1 Answer

Reduce power light on has no throttle and keeps giving throttle accuator cdes


2003 Silverado 2500HD REDUCED ENGINE POWER - Discussion on Topix

www.topix.com > Top Stories
Dec 28, 2009 - 20 posts - ‎12 authors I have replaced the throttle body, had the wires re-connected and .... The gauges all went wild and reduced engine power displayed on the dash. I looked it .... The truck just went to idle for no reason and it keeps happening. 2003 Chevy Trailblazer-CHECK ENGINE LIGHT AND ...
Dec 23, 2011
Reduced Engine Power message
Jul 29, 2008
2003 Chevrolet Silverado - Reduced Engine Power
Nov 3, 2007
Trailblazer - Reducted Engine Power
Aug 3, 2006
More results from www.topix.com

Reduced Engine Power Message Displayed on GM Vehicles

www.underhoodservice.com/tech-tip-reduced-engine-power-message-dis...
Dec 10, 2012 - Tech Tip: Reduced Engine Power Message Displayed on GM Vehicles ... Model year 2008-'10 vehicles must have the engine control module (ECM) reprogrammed ... Do not drop the electronic throttle control components.

Oct 28, 2015 | Cars & Trucks

1 Answer

'Engine power reduced' comes up along with check engine light. Replaced throttle body the other day but it happen again! Anyone know what is going on and what could be causing this?


check engine lights notify problems in 2 areas . firstly the engine and also the transmission.As you state a problem in the transmission it is possible that is the area of concern. A service dealer will be able to tell you exactly what the sensor fault is for that code.

Nov 07, 2014 | 2008 Chevrolet Impala

1 Answer

Reduced engine power


Have the vehicle checked for DTC'S - diagnostic trouble codes ! Do you know what electronic throttle control is ? The gas pedal assembly has electrical connector an sensors inside ,hooked to the PCM / ECM - engine computer . The engine computer uses these position sensors inputs to control the DC motor on the throttle body to open the throttle plate to control the speed . Plus there are position sensors inside the throttle body to input PCM/ECM to see if it's calculations are corect . Your best bet maybe to take it to a qualified repair shop .
Drive by Wire Function and diagnostics by Wells

Reduced Engine Power Mode
When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The control module will perform the following actions:
- Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
- Ignore accelerator pedal input.
• Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.

May 12, 2017 | 2004 GMC Sierra Denali

1 Answer

2006 chevy impala traction control


Reduced power is a problem with electronic throttle contol . drive by wire . Do you know what this is ? Taking the vehicle an having it hooked up to diagnostic tool an checking for DTC'S - diagnostic trouble codes is always a first step when trying to find the root cause of any trouble light ! And not auto zone , pep boys , or advance auto parts . Thier diagnostic tool will not check codes in all system control modules .

Apr 15, 2017 | 2006 Chevrolet Impala

1 Answer

The reduced engine power light comes on at 50 mph what can the problem be?


A lot of times this is a dirty throttle body, possibly sticking at this mph. Clean with battery disconnected with throttle body cleaner. Must be nice and shiny. If the throttle body isn't functioning correctly or it's filthy, reduced engine power light will go on to act as a safe mode.

Feb 18, 2011 | 2003 Chevrolet TrailBlazer

2 Answers

Check Engine Light & Dashboard Reads Reduced Engine Power


The reduced engine power happens because there is a problem with the electronic throttle control . Some people call it drive by wire ! The gas pedal has sensors inside , position sensors , connected electrical to the PCM - engine computer , the throttle body on the engine has a DC electric motor an also has position sensors . These are also connected to the PCM electrical . The PCM reads the position sensors which indicate how much your pressing on the gas pedal . then hopefully it opens the throttle the same amout .

The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system includes the following components:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The engine control module (ECM)

Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn OFF the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF
- Ignore the accelerator pedal input
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.

GM Electronic Throttle Body Circuit Descriptions And Testing Tips

Tons of videos on youtube for these systems , there can be a variety problems , from wiring , worn out sensors , the DC motor , computer etc....

Jun 20, 2017 | 2007 Chevrolet Uplander

2 Answers

Reduced power light came on


reduced power messge is not caused by oil pressure. i assume this a 3.0L v6. this engine has a electronic throttle body which is a electric motor that operates the throttle plate that takes the place of a throttle cable. in cold weather the pcv (positive crankcase venelation) system accumulates moisture that will form on the throttle plate, in cold weather the water freezes and causes throttle plate to stick. when the ecm detects any malfunction whithin the throttle control circuit it is put in to reduced power mode that limits throttle position. usually resets after ign. is cycled. there is a service bullitin to re-position pcv hose behind throttle plate to reduce moisture bulid-up on throttle plate. your saturn dealer can perform this service.

Mar 21, 2009 | 2003 Saturn VUE

Not finding what you are looking for?
2004 Isuzu Rodeo Logo

506 people viewed this question

Ask a Question

Usually answered in minutes!

Top Isuzu Experts

yadayada
yadayada

Level 3 Expert

76109 Answers

Steve Hurc
Steve Hurc

Level 3 Expert

450 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you an Isuzu Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...