Miss on cylinder 1

ANSWER : Hello there, thank you for asking about your 2007 Ford F-150. The problem is most likely with the ignition coils misfiring. I would recommend having a technician from YourMechanic come to your home or office to inspect your misfiring problem and replace the ignition coils.

ANSWER : Hi there. Before going after a possible catalytic converter or oxygen sensor bank(1) sensor(2), the misfire needs to be corrected. The check engine light flashing would be ECM (engine control module)/computer recognizing the misfire. The spark plug and spark plug wire appearing okay, does not necessarily mean they are okay. The fuel injector could be at fault. Resistance value tests, using an ohmmeter could help isolate the problem. Comparing the resistance value with known good cylinders would give you an idea, what you should expect to see. Proper diagnoses needs to be performed to avoid unnecessary repairs. I recommend having your vehicle’s #1 cylinder misfire be diagnosed and repaired by a certified technician, such as one from YourMechanic.

ANSWER : Hi there. There are several possible sources that trigger these two codes including a faulty fuel pressure regulator, weak fuel pump, clogged fuel filter, faulty powertrain control module, vacuum leak, faulty injector(s), faulty oxygen sensor(s) and a faulty mass air flow sensor. You might to have a professional mechanic complete an engine is running rough inspection at your location to pinpoint the source of this issue.

ANSWER : Hi there. Your issue might be caused by a faulty O2 sensor. You might want to read this article about the P0174 OBD-II trouble code as it will show you possible causes, symptoms and solutions to resolve the problems.

ANSWER : Hi and thanks for contacting YourMechanic. What you are experiencing is a misfire detected in cylinder 1 and a random misfire in cylinder 3. This could be caused by either the fuel injectors not firing, the spark plugs fouling out, or a possible blow by ring issue. What I recommend to do is check the injectors to see if they are working. With the engine running, you could remove the injector harness to the injector and see if the engine drops in RPM. If the engine drops in RPM, then the injector is working. If the engine stays the same, then the injector is not working.

With the engine off, you could remove the spark plugs from cylinder 1 and cylinder 3 and switch them with another cylinder. This will make the symptom change to other cylinders if the spark plugs are causing the problem.

If the injectors are working fine and the spark plugs are switched and your engine still is having trouble, then you would need to do a compression test. Check the compression on the first puff and then max out the puff. The pressure indicated on the first puff needs to be half or more of the final puff. If it is less than half, then the rings are probably worn. If all the problems are tested and checks out okay, then I would suggest having a professional, like one from YourMechanic, diagnose the misfiring issue properly so that this issue can be resolved.

ANSWER : Yes, absolutely, rebuild or replace the engine. The vehicle itself is a recent model year so your least cost option will be to repair what you have. And, you’re right, "re-sale value" is irrelevant in the calculation (good for you!). That is, the "cost to compare" in a situation like yours is what it will cost to get your vehicle running versus the cost of buying ANOTHER car. Least cost option, even with engine swap, is usually to simply repair what you already own. Zero compression in one cylinder could be as simple as a stuck valve, however, the low values in the other cylinders mean the rings are likely worn beyond good service, too. You can completely rebuild what you have (always a good option), buy a used engine (risky and requires lots of due diligence and precautions, but still possible), or buy a crate engine (most costly option). As you wend your way through this, we are here to help you. Some select mechanics in certain YourMechanic service areas will do engine swaps. Please simply inquire as to that option and we will help you as best as we can.

ANSWER : A misfire to cylinder 1 may be a fuel pressure regulator sensor problem but it is most likely due to a clogged injector on number one. You will need to scan and view data to see if fuel pressure sensor is needing replacement first. Then have the injectors cleansed to see if the codes go away.

I’d suggest you get this looked at by a qualified technician who can perform these checks to diagnose your Check Engine Light and make the appropriate repairs to your vehicle.

ANSWER : Hey. You may have excessive carbon build up on the intake valves or a broken valve spring or a sticking valve. Have the combustion chambers cleaned using Ford combustion chamber cleaner and spray or have it sucked into the intake to clean the carbon off of the valves. If you see this improve the problem then you may have to have it done several times to get all the carbon off of the valves. If it does not improve, then have the compression checked to see if the cylinder has a compression problem and a valve spring may be broken. If you would like to have this checked, a qualified pro from YourMechanic can come to your car’s location to diagnose the misfire issue.