Skip the auto shop - Our mechanics make house calls

Q: My impala will start but it will not run.

asked by on

ive replaced the cylinder heads and radiator and installed a new thermostat. i also had to get another 2 wire for my ignition module. now my car starts but wont run. to get it to start i have to press the gas at a certain time to get it to fire up and after then when it does it starts to idle low and shut off. then after it warms up it sometimes starts and runs till i put it in gear and it shuts off. so far i have checked the mass air flow unplugged it still shut off. next i checked the intake air sensor i shook the wire and it shut off checked the voltage on it and its getting 5 volts. and ive checked and cleaned the idle control valve and still it shuts off

My car has 230000 miles.
My car has an automatic transmission.

A: Hey there: Anytime you remove cylinder hea...

Hey there:

Anytime you remove cylinder heads, intake manifold or disconnect the fuel system, it's important to clear any OBD-II error codes that may have been triggered either prior to the removal or after you started the vehicle.

The issue you're describing is commonly caused by a communication error from the ECM to the air fuel ratio sensor, O2 sensors, and the throttle body itself. The system will permit initial flow of fuel to start the engine and keep it running while the throttle is depressed.

This might sound simple, but download and clear any error codes with a digital scanner. If this doesn't solve the problems, contact one of our local ASE certified mechanics to diagnose your stalling issue by inspecting your Impala's fuel and ignition system.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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・Save up to 30%

Get a quote

What others are asking

Q: How Often Should my Ignition System Be Inspected?

Periodic ignition system inspections should follow the prescribed maintenance intervals as recommended by the vehicle manufacturer. Maintenance schedules are published in the owner’s manual of every vehicle. Routine ignition system inspections aren't as frequent as they used to be. With...

Q: Van stalling after sitting for years

Hi, you can test the fuel pump by turning the ignition on without starting the engine. Listen for a small buzzing sound near the fuel tank. This is the fuel pump priming, or readying itself for the vehicle to be...

Q: location of knock sensors

The knock sensors are on opposite sides of the engine. Bank 1 is just above the oil drain plug, on the engine block, at the front of the engine. Bank 2 is on the back side of the engine, in...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...