Q: The vehicle is experiencing a lack off power.

asked by on November 19, 2016

G'day Robert, i drive a 1997 1FZ-FE FZJ80R 4.5L petrol Toyota Land cruiser,the vehicle is experiencing a lack of power and throttling between the RPM ranges of 2200-2800 only on hwy use, between 100 and 120 kms per hr in hwy gears.It's never had this problem before. It does not have an idle problem, pinging, stalling ,misfire or knocking problem. The timing is set at 7 degrees, The engine light does not appear at any stage . The parts that i have changed so far and are all genuine toyota parts, which i will list for you below. Spark Plugs,Ignition Leads,Air Flow Meter, Air Filter,Fuel Filter, Distributor .These parts where changed on the 18/11/2016. This vehicle has no oxygen sensor as the exhaust manifold has been changed with pacemaker extractors. The parts i haven't changed are> Throttle Position Sensor and Knock Sensors, Do you think these parts may be the problem ?

My car has 444400 miles.
My car has an automatic transmission.

Loss of power Inspection $94.99 - $114.99 Get a Quote

Your throttle position sensor is a possibility if there is a spot along the sensor that is damaged. The vehicle data can be watched with a professional scan tool. As you sweep the throttle, you should see the voltage change at a steady pace. You may see the voltage reading drop out when the sensor pickup passes over the dead zones. Consider hiring an experienced technician like one from YourMechanic who can come out and take a closer look at the lack of power concern and offer a more personal diagnosis.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Warning code P2422
Hello. The vent valve is a common failure on this vehicle. Most of the time, when it is stuck closed it will also cause the vehicle to be hard to fuel with gas. I typically test the valve first and...
Vehicle bucks while driving
It's not likely that servicing your transmission will fix your problem. Without experiencing the problem firsthand, it's difficult to say if what you have is an engine or transmission problem. Obviously, internal transmission issues can result in a harsh downshift...
P0446 Emission control system vent circuit malfunction
Hello! We will be happy to assist you. It may be the gas cap because one way the EVAP system tests itself is by monitoring the pressure inside to fuel tank and comparing it to atmospheric conditions. If the pressure...
Flashing check engine light - 2005 Ford Ranger
Hey there. You should probably have another look at your plugs (https://www.yourmechanic.com/services/spark-plugs-replacement) and wires (https://www.yourmechanic.com/services/ignition-cable-spark-plug-wires-replacement) to see if the work was done correctly. Something may not be well connected causing an intermittent misfire. The Check Engine Light comes on steady...
the bolt size at the top fixed chain guide 2.2 ecotec
Hello. The timing chain guide bolts on this engine are an M6 x 1.00 30mm. You will need to remove the rest of the broken bolt from the engine prior to replacing these. The replacements are available over the internet...
"TRAC OFF" light came on after diagnostic test for check engine light
Hello. In most cases the vehicle's traction control system is on a completely separate circuit then that of the engine knock sensor. Therefore most knock sensor faults or issues should have little to no effect on the operation of the...
I have a 2004 Dodge Ram 1500 5.7 Hemi engine V8
Hi There, It sounds like you may have a couple of separate issues going on here. The idling problem may suggest you have a dirty or faulty idle air control valve. The idle air control valve (https://www.yourmechanic.com/services/idle-control-valve-replacement) monitors the air...
Driver door won't unlock or lock from the inside and out. We are currently on the outside locked out
The problem sounds like the door latch or door lock is seized and will not let you open the door. You will need to get in through the passenger door and the inside door panel will need to be removed...
Will diagnostic fee go towards repairs?
Some customers have obtained a diagnostic of their vehicle's problem already - whether through their own efforts and expertise or from another professional - and thus will just request a specific repair directly. Of course, no vehicle can be repaired...

Related articles

A Buyer’s Guide to the 2012 Toyota RAV4
While While the Honda CR-V might have been the pioneer of the compact SUV market, there’s no question that the 2012 Toyota RAV4 is king of the class. Not only does the RAV4 come with your choice of either a...
A Buyer's Guide to the 2012 Toyota Avalon
If If you’re in the market for a large, luxurious sedan, you’ve probably noticed that the market is getting considerably smaller every year. Where once it was quite common to see Mercury Grand Marquis and Buick Electras, nowadays, it’s rare....
The Best Used Cars to Buy for Teenagers
If If you’ve decided that you’re ready to purchase a used car for your teenager, then you’re probably pretty picky about what you’re looking for. Likely affordability, safety, and fuel economy are high on the list. With that said we’ve...