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.

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 1,000 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
  1. Home
  2. Questions
  3. Very hard to start vehicle

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: Codes P0420 and P0171 appearing

When it relates to the air conditioning system, the dealership does not have an advantage when it comes to hybrid air conditioning systems. These air conditioning systems require special evacuation machines that are different from that of a normal air...

Q: Car won't start

You may have gotten a defective starter and would need to have power pumped to the starter to make sure it is getting power from the starter relay. If no power is getting to the starter solenoid from the starter...

Q: Just paid $700 for tune up at Ford dealership, now I'm getting a P0430 code from engine light

Hi, thanks for writing in. This code is for the O2 sensor after the catalyst for the driver side. You will need to have the code diagnosed to see if the sensor is working okay or the catalyst is bad....

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...
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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...