Misfire!

[Chevelle Kid]

Ok, so my Ranger was misfiring bad, so I did what anybody would do. Plugs and wires. Plugs I bought at work but I wanted Motorcraft wires to go with the Motorcraft plugs I bought.

The plugs I put in right away, but the wires were still being shipped so I couldn't do them. Miss cleared up 98% of the way with just the plugs (it was originally missing so bad that it felt like I had a badass cam) so my thoughts were "Damn, the wires will be the icing on the cake, it'll run mint!" So 3 days later they come in (Stupid Pres. day) and I put them on. Now it's running with more of a miss. Not as much as I originally had but way worse than with just the plugs!

It's a '93 4.0, 216K on the clock. I checked the connections and they are on, without a doubt.

What else could it be??????

Ben

 

[shane96ranger]

Ok, so my Ranger was misfiring bad, so I did what anybody would do. Plugs and wires. Plugs I bought at work but I wanted Motorcraft wires to go with the Motorcraft plugs I bought.

The plugs I put in right away, but the wires were still being shipped so I couldn't do them. Miss cleared up 98% of the way with just the plugs (it was originally missing so bad that it felt like I had a badass cam) so my thoughts were "Damn, the wires will be the icing on the cake, it'll run mint!" So 3 days later they come in (Stupid Pres. day) and I put them on. Now it's running with more of a miss. Not as much as I originally had but way worse than with just the plugs!

It's a '93 4.0, 216K on the clock. I checked the connections and they are on, without a doubt.

What else could it be??????

Ben

Is there any chance you cracked one of the plugs putting it in? Or maybe they were damaged in shipping? I've had that happen before.

 

[Chevelle Kid]

Is there any chance you cracked one of the plugs putting it in? Or maybe they were damaged in shipping? I've had that happen before.

Plugs were in for about 3 days before I put wires in, ran great with just them in.

 

[powerranger262]

Search for a firing order diagram for your truck and doublecheck that you didn't mix up the wires.

 

[shane96ranger]

Plugs were in for about 3 days before I put wires in, ran great with just them in.

I guess I should have gone into more detail. Mine took a few days to show up when I put a cracked plug in (or cracked it putting it in). I had to go through all 8 to find it too (it was the last one I checked). But it ran beautifully after that.

 

[shane96ranger]

Search for a firing order diagram for your truck and doublecheck that you didn't mix up the wires.

Here's the 4.0 firing order.

http://www.therangerstation.com/tech_library/4_0_Page.html

 

[Chevelle Kid]

Firing order is right, already checked that. Besides, it's not a constant miss like one would have with the order being off. I'll check plugs tomorrow. Just pissed because I didn't cheap out on parts...lol

 

[powerranger262]

I guess I should have gone into more detail. Mine took a few days to show up when I put a cracked plug in (or cracked it putting it in). I had to go through all 8 to find it too (it was the last one I checked). But it ran beautifully after that.

Same thing happened to me. It ran like crap, couldn't figure out what was doing it, and I even stuck a few other parts in it. Finally after about 20,000 miles, CEL came on for a cylinder 3 misfire. Pulled plug and it was cracked the whole length of the ceramic. Lesson learned-check over all plugs right out of the box.

 

[Chevelle Kid]

I think I found my problem. The problematic loose intake bolts are making cyl 5 foul out with oil. Explains why at a constant higher rpm she's just fine...lol

Thanks for the help people!

Ben

 

[powerranger262]

That'll do it.

 

[shane96ranger]

Glad to see you've found your issue!