Skip the auto shop - Our mechanics make house calls

Q: Very hard to start vehicle

asked by on

would you have any insight on why it's very hard to turn on when engine is cold I live in Texas so it's not really cold .. It's gotten harder to turn on ? But once engine warms up it's finally turns on it runs smooth no hesitation or jerks . Only codes that came up are for the knock sensor and (2)catalytic converter below threshold efficiency . I put some cleaner in for the catalytic convertor and it took away one codes p0430 but the p0420 remains. New parts this month Fuel pump Fuel filter Fuel relay Fuel sending unit Water pump Timing belt Thermostat Harmonic balancer Throttle position sensor Temperature control sensor

My car has 222235 miles.
My car has an automatic transmission.

A: Hello. This code is also related to the cat...

Hello. This code is also related to the catalytic converter not working properly. This can also happen when the ground wires connected to the O2 sensors are not properly hooked up causing them to send erroneous info to the computer. Try checking these to be sure they are properly connected. If this does not solve it, try having the computer re-scanned. You have replaced many components already, so your best option may to have the problem diagnosed before changing any more parts that may not need replacement. If you need help with this, a certified professional from YourMechanic can come to your car’s location to inspect the hard start and related codes in order to get this properly fixed.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Code P0420 shows on the dash of my 2005 Acura MDX

Acura did have a tech bulletin released in September 2011 regarding fault P0420 and a possible software update that may rectify this situation. You can try contacting your local Acura dealer service department or Acura Customer service to see if...

Q: Occasionally will not start

I am assuming when you say it won't start in this case, the motor will not turn. It's an important distinction to make. Is it a "Crank no start", or is it a "No crank". With the crank no start,...

Q: Scan vehicle Code P0430 Cataylic system efficiency below threshold bank 2

The code is meant to indicate your catalytic converter is not performing up to par with the EPA (environmental protection agency) standards. Your car uses the oxygen sensors to monitor the catalytic converter (cat) efficiency. There is an O2 sensor...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...