Pulled the codes after and still says cylinder 4 misfire So I decided to take my Explorer back to Technology R where they told me cylinder 4 injector was dead. I pulled the codes and it came up with 2 codes for cylinder 4 and a heater circuit bank 2. I recommend replacing the sparkplug wires also when replacing the coil pack I have had a bad coil pack fry my wires. 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. Once the fuel injector is turned off, the cylinder is now basically an air pump, which reduces the potential for catalyst failure. If you have a coil pack, they run around 60 dollars and are easy to replace.
A timing belt or chain that has skipped a tooth is a rare but possible reason for lack of compression sequence. You may be replacing parts all day long and maybe there is a broken wire or something. You decide to connect a scan tool anyway and to check for possible pending trouble codes. 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. Your symptoms are typical of old plugs that have never been changed or need replacement again.
Generally, a misfire will trigger the engine check light and the truck's exhuast will smell like gasoline. In this example, cylinder 3 shows reduced rpm, which indicates that cylinder 3 is not contributing as much as the other cylinders. Additional Advice The odor emanating from the exhaust tail pipe could indicate a coolant or antifreeze is leaking into the engine. Low compression is a symptom of other engine issues. There are many individual issues that can create cylinder misfires, and they fall into three basic categories—fuel, ignition and engine mechanical. Coolant leaking into a cylinder is another.
Figure out why your Ford isn't performing like the powerhouse it's supposed to be. Still ran like a champ. Engineers program specific limit values for systems and components in order to determine when a fault code should be set. Engine cylinders with low compression due to wear and tear will misfire under load. They're the only part in the combustion chamber that's easily removable. Experience is anyone of them can misfire but Fords of that vintage sometimes have problems with cooling leaks on that hole from heater hose I had exact same problem on my '99. This article walks through a few of the most common causes.
If that gets you nowhere, next step would be compression test. . Is is the boot wet or discolored? Also, avoid damaging sensitive engine parts like spark plugs or coils when cleaning the engine bay by using a high pressure air nozzle instead of water to blow away dirt. The white area in the photo indicates a burn-through in the rubber boot where the secondary voltage escaped. But the light is not on.
. The second and third firing events also show unstable secondary burn. Ford trucks tend to recognize misfiring coils and will register them with a diagnostic trouble code. Unfortunately, you note no obvious issues. I would make a visual inspection of both or just replace both. 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. Although the problem could be caused by a bad spark plug, that is not the whole story.
This is… Cylinder 4 misfire appears to be a common problem on the Triton V8 especially on trucks. The left image in Fig. A misfire is the lack of one or more of the following : Fuel, Spark or Compression in one or more cylinders. For example, the screen capture in Fig. The result is an engine that stumbles, idles roughly, and doesn't perform at 100% power. Based on this reasoning, the fuel system is not likely to be the source of the intermittent misfire.
. Is your alignment and suspension squared away, yet your truck still shakes at. Some techs are coil swappers. This might require an extended road test on later-model vehicles. Very few shops want to do that job since they break in the heads and then you need special tools to remove the broken parts.
We know from our road test that the misfire is not present at all times, so we need to consider what can cause intermittent misfires. The first secondary ignition firing event is turned into a sea of solid blue, and it looks like we have times where the secondary voltage goes high and then very low. This article applies to the Ford F-150 2004-2014 and. Hope this helps, if not, check for a vaccum leak. Also could be a bad sparkplug wire.
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. By - November 19, 2014 Contributors: This article applies to the Ford F-150 2004-2014 and the F-250, F-350 Super Duty 2005-2014. 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. There are several possible causes of misfire ranging from worn spark plug to faulty coils. In review, the key to quickly finding intermittent misfire issues is having a consistent strategy and being comfortable with your equipment. Causes can be almost anything, from a bad spark plug to a mechanical fault in the engine itself.