Q: Engine problem - 2009 Toyota FJ Cruiser

asked by on

hi

i have 2009 toyota fj cruiser manual transmission

there is problem: 1- sometime i hear knock sound if drive car from 0 mph with 2nd gear

2- if i press brake pedal, rpm idle drop down to 400

3- sometime my engine shake quick just 1 second (look like you turn the key off and you turn on quick)

but this 3 problem not always happen only once a day

4- my car become very slow and no torque hard to reach 80 mph

but i do everything change (air filter, spark plugs, fuel filter) clean throttle body and clean fuel injection

but nothing change still same problem

thanks

My car has 120000 miles.
My car has a manual transmission.

Hello. A knocking sound when starting from a stop in second gear is to be expected. This sound will come from either the motor or the transmission. I don’t recommend starting off in second gear. It isn’t good for your car. It can contribute to premature transmission and or clutch failure.

Admittedly, most cars can begin in second gear with only minor issues. Mainly it will wear your clutch out sooner than normal. The pressing the brake pedal that affects your idle is most likely a leaking check valve in the hose that goes to your power brake booster. This creates a vacuum leak when you depress the brake pedal. It is possible the check valve is causing these other problems under different conditions. You should be able to disconnect the vacuum hose to the brake booster without creating a vacuum leak. If a leak exists when you disconnect the vacuum line, replace the check valve.

A few things I would be doing aside from what I have already stated. I would inspect for vacuum leaks, connect a scanner and study the data and clean the IAC (idle air control) valve.

If you should need further assistance, I recommend having a certified pro, like one from YourMechanic, diagnose the misfiring symptoms and perform the appropriate repair.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Engine problem - 2009 Toyota FJ Cruiser

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

Get a quote

What others are asking

Q: New engine stalling.

After a new engine is installed there are often times where small steps are looked over. My best recommendation would be to take your car back to the place that installed your engine and have them take a look at...

Q: Blinking Check Engine Light, issues with rpm, possible spark plug issue?

Hey there. The gas smell you experience is most likely due to the unburned fuel due to the engine misfiring. Since you smell unburned fuel, the cause is most likely spark-related. If any spark plug is not firing correctly, the...

Q: Second Opinion

You should get a complete cost break down in writing. The price may not be just for the water pump and have additional repairs like thermostat and hoses or flushing of the system. make sure you get all work in...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.