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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: My car shows trouble codes P0133 and P0420

Hi there: It appears as if you've got a lot of miscommunication going on with your mechanic. Here are a few basics. First, anytime an error code is triggered, such as the P0133 OBD-II code the issue needs to be...

Q: Celica 190 vvtli Not turning over

Hello, thank you for writing in. The fuel smell may be coming from several different scenarios. If there is an issue with the ignition system (or spark plugs), then the fuel that is being sent to the engine is not...

Q: Can I drive my car with code po430 code

A P0430 code indicates the catalyst efficiency has fallen off. If there are no other codes indicating misfires and if the check engine light is not blinking, you should be OK to drive your car. If you have trouble scheduling...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.