Skip the auto shop - Our mechanics make house calls

Q: After engine sets for 6+ plus hours it hardy starts

asked by on

The truck turns over like it should but after overnight setting it takes multiple attempts to start. Just changed all fuel injecters and the coils n plugs are less than a year old. Fuel pump is less than 2 years old. I had a hit and miss problem with missing coolant and plugs may have have a slight green tint. Truck runs and starts great after warmed up. P 0172 is code but tail pipe is off truck.

My car has 105317 miles.
My car has an automatic transmission.

In most cases, the P0172 error code indicates that there is too much gasoline being detected in the exhaust gases exiting the combustion chamber. The ECU uses a number of instruments, such as the mass air flow sensor (MAF), oxygen sensors, and manifold absolute pressure (MAP) to monitor the air-fuel ratio of the engine. Having the tailpipe off the vehicle could cause this problem to occur, since the vehicle’s engine is tuned to have the entire exhaust system attached.

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: Shuts off while driving

The main cause of engine stall on this particular model vehicle is the mass air flow sensor. Normally, this will generate a code on the ECM, that can be detected with a scan tool. The MAF sensor generates a waveform...

Q: Poor performance

With the information that you provided, I would look at either the catalytic converter being clogged, or the actual fuel pressure getting to the fuel rail. As the converter ages, it is possible that the substrate in the converter can...

Q: Engine cranks but won't start.

Your P0101 may be related to the 171 and 174. Any and all of these can be caused by an air leak. Check under the hood for vacuum lines or air boots that have come off or are not well...

Related articles

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...
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...
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.