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?
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: I have a 06 Infiniti M45. The service engine light came on. Got the codes of p0420 and p0430. Wondering if I need to replace both O2 sensors.

Hi there. When the codes P0420 and P0430 come up, usually the catalytic converter has failed, but before you determine if you need to replace the catalytic converter, consider checking the following: A damaged or failed oxygen sensor on...

Q: My 2012 chrsyler 200 red security indicator light came on car won't start what does that mean?!!

This is a common problem in many of the Chrysler model cars. I would suggest taking it to the dealer to have the security system reset. The fact that this happened when turning on the defrost suggests a potential short...

Q: Getting a P0430 code on my Buick Century 3100.

Hi there. The code p0403 is for the EGR circuit that shows it has malfunctioned. The code p0430 is for the catalytic converter showing that its below threshold. Check the harness to the EGR and make sure that all of...

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 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...
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...