Bad Injectors Injectors can get clogged if the fuel filter has been neglected. Well I drove it around hooked up my snapon dealer told me this would tell me what cylinder was not firing ok so I drive and tells me 9 was a very non contributing cylinder had 2 extra coils put one on still ran like crap. One way to think of the V10 is as a 4. If you have a scanner sometimes just clearing the codes and the miss will go away. Replaced the three coills and truck runs like new. Service information would point to resolving the fuel injector fault first, which would resolve the P0303. In some cases, a carbon trace will develop inside the boot and the secondary voltage will travel down the side of the spark plug to ground.
Don't worry if all cylinders show a few misfires, look for the ones that show thousands of misfires. You might be wondering how dealership technicians deal with cylinder identification issues. When I first took this to him he did get a code for a misfire on the back two cylinders. May 24, 2011 It could be the air-fuel ratio is too lean and isn't correcting for a low air temperature. Antifreeze leaking into the spark plug tubes or intake manifold will result in an engine misfiring, too; although in this case, you likely also have a blown head gasket.
They're the only part in the combustion chamber that's easily removable. Dec 14, 2015 It's can be difficult to figure these things out sometimes. Could also be one or more burned valves. This article applies to the Ford F-150 2004-2014. Check for proper operation of the fuel pump and for restrictions in the fuel filter and lines. The misfire data will show which cylinder or cylinders are misfiring. Attach a scan tool to the vehicle's data link connector, located under the dash near the steering column.
Excessive amounts of unburnt fuel will melt the internals of the the catalytic converter. I love this truck and engine until recently. The specific coil pack for your truck should look similar to these. Usually it can miss the mechanical issues like a vacuum leak, or a bad valve in a cylinder that is firing good electrically without the whole bank running rich with the unburned fuel from that one cylinder. The Actual column displays the value for the last test performed. But this is a Ford, and misfire data parameters are not available in the enhanced data stream.
However many 1997-2008 engines have a fatal flaw in the cylinder head. Might have to take it to the local ford dealer for fix-local guys can't seem to fix or want to retire on the fees for replacing all coils and fuel injector harness-can you give me an idea on fees and parts? My mechanic could not find a specific problem and his diagnostic code reader indicated a bad ignition coil on cylinder 10 - I have only 8. In this example, the Actual value is 729, which is greater than the Min value of 512, which means the O2 sensor passed the last test. The Max limit in this case is 1638 and the Actual value is 1177, which means that during the last trip, misfires occurred, but they had not exceeded the limit. There are many individual issues that can create cylinder misfires, and they fall into three basic categories—fuel, ignition and engine mechanical. This occurred secondary to a motor replacement, but have not found any wire pinches, yet. This is what it has to say, I've listed them in the same order as they did for a surging engine under load driving.
But how often have you have swapped coils only to find that the misfire is gone on the original cylinder and all you did was trade one misfiring cylinder for another. The injector tester is also a big help. I swapped injector 5 and 7, no change into the misfire. The result is an engine that stumbles, idles roughly, and doesn't perform at 100% power. Low compression is a symptom of other engine issues. Additional Advice The odor emanating from the exhaust tail pipe could indicate a coolant or antifreeze is leaking into the engine.
Ford recommends changing them after 100,000 miles. Check plugs and wires, plugs excessively worn with five of them carbon traced. Ford F-150 and F-250 owners should always consider seeking services of a skilled mechanic since misfiring can be caused by many factors besides the aforementioned. Spark plugs are actually quite long lived. Where should you go from here? But the light is not on. Here are four likely engine-related issues.
This is more of a problem for older trucks than newer models. In this example, we determined the source of the problem was in the secondary ignition area and a new boot and spring should fix the problem. That is why I keep leaning to a problem with spark because fuel is getting into the cylinder and pumped out of the cylinder, just no ignition is taking place. You roll back into the shop and continue following a good diagnostic procedure by performing a thorough visual inspection of items related to engine performance. Damaged fuel lines cause the engine to misfire and can possibly start a fire in the engine. Low compression is a symptom of other engine issues. Anything above a Chevy used threaded studs, they didn't fall off, just raised an eighth inch or so and would have problems.