Minor misfire

B

bluesboyst

New member
Hi.. I have a misfire but it's not enough to set a code...It only happens when I go into 3rd or overdrive and give a little throttle...if I give it more throttle it stops. I used to get this in my towncar and I would replace some of the ignition coil boots. I have done this in the Marauder but it it still there. I am going to try replacing the coils since they are original, 20 years old now.

Anyone have thoughts on this?

Steve
 
Need a scan tool to read the cylinder contribution to find the mis. Try n get that done before replacing things. A mis could be injector, coil or spark plug. Even the wiring sometimes.


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I've had this happen, took it to the dealer for diagnostic. They told me which cylinder and I changed the coil myself. Fixed it. Quicker and cheaper that trial and error. Or you could just replace all 8, which will cost more than the diagnostic. Until it throws a code, handheld scan tool won't tell you which cylinder is intermittently missing.
 
My son owns a truck parts business and he has a very expensive 2000.00 scanner. That could not detect what cylinder.
 
bluesboyst said:
My son owns a truck parts business and he has a very expensive 2000.00 scanner. That could not detect what cylinder.
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You need to drive it with somebody and they need to watch the values on the scanner, I used a snap on one to figure mine out.


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I went to a ford parts dealer here in Massachusetts Quirk Ford... For a genuine ford part they were only 51.80 per coil. Since all the coils in the car were 20 years old I bought eight of them. Problem solved. It was on the left side....what a difference.....
 
All right I think I figured this out, the part number ending in AA is for the 5.4 Liter Ford Engine, and the part number ending in AB is for our 4.6 Liter Engines our Marauders. Big price difference between the 2 part numbers for a pack of 8 Ignition Coils.
 
IMG_3659.jpghas anyone been replacing the coil connectors. when I pull the coil covers so many of the wires are cooked so I have been swapping coil connectors and it usually works but on #4 it didn't now going to swap plugs back to motorcraft from ngk and going with the sp433x. what's the deal with .054 vs the .060gap says OEM is .054 and the platinum is .060. honestly I'm only going to swap 4 of them Sunday after church if they get delivered on time and I'll do drivers side on friday. I'll try to log in from my phone to post pics of crunchy wires on connectors
 
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FordNut said:
I've had this happen, took it to the dealer for diagnostic. They told me which cylinder and I changed the coil myself. Fixed it. Quicker and cheaper that trial and error. Or you could just replace all 8, which will cost more than the diagnostic. Until it throws a code, handheld scan tool won't tell you which cylinder is intermittently missing.
Click to expand...

Thank you, FordNut. This just happened to me. A handheld scanner detected intermittent misfire/code for three cylinders on the right side. I am pulling all eight plugs to send pics and the to Marty and Jeff (MOs Speed Shop). I will replace the NGT 4177 plugs (gapped at 0.027). If problem persists, I will do what Marty/Jeff states next.

I need to find a good Ford engine mechanic without using my judgement what 'good' is. I do not want to repeat my mistakes of the past.
 
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