Skip the auto shop - Our mechanics make house calls

Q: Trouble starting car when cold

asked by on

When it is cold outside, my truck will not start in the mornings. There is not fire. I can put a hair dryer on the motor at the throttle body and get it hot for about hour. My truck will start but it is still hard to start and it backfires through the exhaust. I have put whole distributor, spark plugs, spark plug wires, fuel filter, crankshift position sensor, map sensor, innition coil, innition control module, coolant temperature sensor, runinjector cleaner in it, and tried changing the PCM. I am so dump found out and dont know where to go.It is keeps giving me the codes P0420 and P 1345. I am lost can you please help?

My car has 134569 miles.
My car has an automatic transmission.

A: The starting issues scream timing. The typi...

The starting issues scream timing. The typical causes that set these codes are the cam and crank position sensors. The only option you have not tried to my knowledge is the camshaft position sensor. I would start there.

With all the recent work that has been done, you may want to start by checking the ignition timing, and verify that the timing is correct. Poor timing can have an effect on the exhaust and be causing the code P0420.

Always double check that ALL previous repairs that were made and verify they are holding. Make sure all the engine timing was set correctly and doesn’t need adjustment.

To avoid any unnecessary repairs, consider YourMechanic, as one of our mobile technicians can come to your home to diagnose your hard starting condition and fix it accordingly.

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: It cranks doesn't start new batteries, oil pressure switch new pmd, new injection pump. new alternator, new glow plugs.

Hello. A crank but no start condition can be caused by many things. A few common causes are a faulty crank position sensor, or issues with the fuel system. The crank position sensor is used in the engine's fuel calculations,...

Q: When I start my car on a cold morning I have to pump the accelerator to get it to start.

As a general rule, car engines do not like cold weather and do not do operate as well in cold weather. When you start your car in the morning and turn the key to on, the coolant temperature sensor immediately...

Q: With car off, exterior and interior lights start flashing

It sounds like somehow the anti theft system was activated and drained the battery. Try locking all of the doors from the inside and close them. Then lock, unlock, lock and unlock the doors to see if the problem persists....

Related articles

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...