Skip the auto shop - Our mechanics make house calls

Q: Flashing check engine light.

asked by on

I have a flashing check engine light comes on then goes away while accelerating in 2nd or 3rd gear. P0301 is the bad code. I have changed Spark plug, wire and fuel injector on cylinder 1. I will replace my distributor cap this week. I do not have a catalytic converter. I have also seafoamed the truck twice with no luck.. truck is running rich and I have loss of power. it started last week 7/26/16 and I have been taking it easy while driving. What else can I check and/or replace to fix this issue?

My car has 185000 miles.
My car has an automatic transmission.

If you keep having code P0301 come back, and you have replaced the injector, plug, and wire, then you may have excessive carbon build up on the valves or you have low compression in the cylinder. Since you had the engine sea foamed twice, it may have cleaned some carbon off the valves but not enough. You may need to do a compression test and have an engine decarbonized by flooding the engine with combustion chamber cleaner and shutting off the engine. Let it sit for thirty minutes and then start and run the engine by revving it several times and then hold engine at 2500 to clear the engine of carbon. If you want to have this checked out, a certified technician from YourMechanic can come to your car’s location to diagnose the vehicle’s loss of power and let you know what needs to be done.

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: Car is overheating and no heat. 2000 Dodge Neon

Hi there - you may have 2 distinct problems at this point. If your engine is still overheating, the cooling system may not have been bled properly, leaving air pockets in the system, and causing poor heat transfer, no heater...

Q: Grinding noise in park truck wont move

Hello there, there are a few possible cases for the truck to stop while driving like this. You did not mention if the grinding noise is in all the gears or just park. The most common would be a transmission...

Q: On the 4.7 which tensioner plate goes with which tensioner?

The best thing to do is look at the brackets that are to be mounted behind each tensioner and match up the bolt holes that mount the brackets in place. Then install the chains and install the tensioners. Then you...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...