It could be the coil or an injector but I am curious what brand of spark plugs did you use ?
On the coil there is a #1 with an arrow to the plug wire. I followed that one and replaced the plug and the wire. I think I got the right one. #1 is on the passenger side close to the firewall.I don't mean anything by this but I have to ask because a lot of people mix this up. What plug and wire are you calling #1?
motorcraft and Autolite... they're both the same, just different name...Bosch platinum plugs with the pointy tip electrodes are problematic to put it nicely.I would always recommend to go back with factory spark plugs which would be motorcraft.I would remove the spark plug and inspect it due to the design it only takes a small piece of carbon to cause a problem.
What engine is in it? i'm not familiar with the tore-a$$...On the coil there is a #1 with an arrow to the plug wire. I followed that one and replaced the plug and the wire. I think I got the right one. #1 is on the passenger side close to the firewall.
Is that correct?
So you're saying I replaced the spark plug with something that is known for having the same exact problem? Ugg. There's more wasted money.motorcraft and Autolite... they're both the same, just different name...
just like mopar used champion, and GM has AC-Delco.
On the coil there is a #1 with an arrow to the plug wire. I followed that one and replaced the plug and the wire. I think I got the right one. #1 is on the passenger side close to the firewall.
Is that correct?
I've already replaced both the plug and the wire, so the only other spark problem would have to be the coil. I'll pull #1 and to a spark test on it to see if it is properly sparking.Yes that is the right one. Good. You have no idea how many people think bank one is the front of the engine. I read this thread but can't remember seeing if you replaced the coil or not? Are you getting good spark at that wire? Pull it off the plug and get a spark tester from any parts store and test it. If you have good spark with a tester at the plug end of the wire the coil and wire are ok. No spark then you need to check it at the coil end of the wire. Good spark there = bad wire. No spark there = bad coil. I doubt that you would replicate the same misfire over the span of two or three different plugs so for the sake of diag don't change them again. You could swap #1 with #4 to see if the miss follows it but I doubt that will happen. I do agree that Motorcraft plugs are the best. Autolite, contrary to popular belief are no longer made at the same factory as Motorcraft and are not related any more. The Autolite is an ok plug but not as good as OEM. Okay, back to the diag. If you have good spark to the plug we are looking at either a fuel issue or a base engine problem. Fuel injectors are hard to swap around but it is a good test. If the miss follows the injector you know what is next. If you have or can borrow a scan tool that will monitor basic PID's set it to watch the injectors for faults. If it counts any faults you need that injector. The free scans at AZ and other places won't tell you anything, nor will the hand helds that you can buy for a couple hundred bucks. What I would do first is a compression test on the engine. Pull all the plugs and check it with the throttle wide open. A common issue that causes a misfire is broken valve springs. Compression test will tell you a lot. If it is low on #1 pull the cover and have a look. Compression ok and I think we are looking at a fuel injector faulting enough to alarm the PCM. Don't over look fuel pressure either. Low pressure will usually affect an entire bank but it could single out a weak injector.
I took out the Autolite spark plug and replaced it with a Motorcraft spark plug. This one.
I then drove from New Haven, CT to Boston, MA, about 130 miles. The engine did well but I *briefly* got an engine light when I stopped to get gas. The light flashed a bunch of times and then went away.
I have a sneak suspicion that the plug and wires are fine, but that this is a coil or injector problem.
Can someone help me with an injector inspection/swap? Pictures would be amazing.