Engine idles but will not accelerate

Hi Blatant1,

A MAF problem can cause the O2 sensor to trigger a trouble code or vice versa.

What were the exact codes?

Did you test the fuel pressure? Get a leak donew test done as well.

The fuel filter is a non serviceable item located in fuel tank but it sometimes leaks internally and this would cause fuel pressure drops.

If the filter is the cause, you would require prolonged cranking to start if the engine had been left standing for a while.

I recently replaced a honda accord lx 4cyl engine with a low milage engine that was workin great in other car.the old one had a bad head .the new engine now will idle a little rough but will not accelerate above 1000rpm if you hold pedal above 1000rpm at about 2000rpm the idle will go up and down and will not accelerate at all without falling on its face back to idle speed

Go to this link for more information: https://www.2carpros.com/articles/engine-surges and https://www.2carpros.com/topics/engine-performance/surges

i have a 99 honda accord lx f23a1 and well recently we swapped out the motor with another lower milage motor same motor but the problem is the car will start fine the idle good around 1800 and well when stepping on the gas the rpm will hop up and down like choking and not wanting to stay at an idle, you can rest the foot on the gas and see the rpm will not rev pass 3k eventually it will BOG then shut off, can it be due to a vacum hoses or O2 sensor or throtle cables? we swapped everything back as is, if the car sits it stays at steady idle, so do you guys have a ANSWER??

Inspect and test all the following listed below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking,fuel filter or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard

my accord has problems it starts fine however when you give gas the engine dies it wont rev i floor it goes to 4krpm and when engine is warmed up it dies and wont start i did compression test its 200 i all cylinders changed the distibutor problem stilll persists i replaced cat sensor problem still exists it is just sitting im my garadge for months now please help im using bus as daily commute and cant afford to pay to get it towed to shop....

Hi there,

First thing try to get a code read, that may help diagnosed your problem, A fer things to check. Fuel pressure and fuel filter is not blocked. blocked exhaust collapsed cat converter. When engine is revved free exhaust flow at rear. Try these first.

mark (mhpautos)

what needs to be done to my honda 99 after being tested and code p0740 came up showing that the clutch solenoid circuit is open? Also when flushed out the fluid was almost black with pieaces of metal in and on the flush plug and slipping occurs while driving with poor acceleration.

Hi there,

With what you are describing i would say that your transmission is well over due for overhauling as the black oil and metal are signs of component failure due to slippage and overheating.

mark (mhpautos)

my 1999 honda accord lx sedan has trouble reaching high speeds & sometimes wont rev over 35,000 rpm

If the Check Engine Light is indicating, get a scan done to retrieve the trouble codes and proceed from there.