Misfiring, can't solve this. HELP!
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New User
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Misfiring, can't solve this. HELP!
I bought my truck about 2 years ago. six months after buying it, I went through some big puddles and it started misfiring. Not worried, I proceeded to replace the spark plugs (knew I would do it anyways, and figured water was the problem). When doing so, I replaced two torn COP boots. The boots came with new spring terminals, but they were different from the factory ones. The ones I bought look like this:
http://ecx.images-amazon.com/images/...500_SL150_.gif
The OEM have a black thing at the end of the spring. I cannot use it with the new one. Is the pictured replacement the reason why my truck still misfires???
no CEL, all coils test in spec.
please help, I have been dealing with this problem for over a year!
http://ecx.images-amazon.com/images/...500_SL150_.gif
The OEM have a black thing at the end of the spring. I cannot use it with the new one. Is the pictured replacement the reason why my truck still misfires???
no CEL, all coils test in spec.
please help, I have been dealing with this problem for over a year!
Elder User
Joined: Oct 2008
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Whenever a coil on my truck goes bad, the CEL never illuminates. My buddy hooks me up to his diagnostic scanner to tell me which is bad, but I see no fault in testing each coil to see if they are good either. Sorry I couldn't help more 
.
.
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Does anyone know if a coil is better off testing towards one end of the spec range or the other? i.e., new coil = slightly higher resistance than old coil or the opposite?
Elder User
Joined: Dec 2007
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From: White Rock BC Canaduh
Hi Phoenix,
For intermittent misfiring like that it can be a real PITA. I would guess you either have a coil on it's way out or a small amount of water in one of the plug holes that is just enough to cause the intermittent misfire.
You should consider purchasing a ScanGaugeII <---link or something similar.
It not only has 4 selectable gauges to monitor many engine temps, rpm, volts, mpg ETC,,, it scans for codes in real time and automatically stores them so you can view them even after the fact. I plugs directly into the obd plug
Rick...
I have some better photos, but I just can't seem to be able to find them. I can take more if want to get a better idea of they look like installed and in use.
i ain't rite
Joined: Mar 2005
Posts: 65,507
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From: Marlboro Mental Hospital.
it could also be bad plugs. did you get the spark plugs from the dealer, or from a parts store.
i have seen a lot of misfire issues that were caused by aftermarket spark plugs.
i have seen a lot of misfire issues that were caused by aftermarket spark plugs.
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From: Long Island USA
What engine, and what year?
The "black things" might be a resistor, but can't tell, the picture link you posted doesn't work.
You have to check the misfire counters, that are specific to each cylinder. Only a reader with the "ford extended parameters" will be able to read the misfire counters. Might be worth a trip to a good mechanic.
Once you know which cylinder(s) is/are misfiring, you'll know exactly what to attack.
What brand plugs did you use?
The "black things" might be a resistor, but can't tell, the picture link you posted doesn't work.
You have to check the misfire counters, that are specific to each cylinder. Only a reader with the "ford extended parameters" will be able to read the misfire counters. Might be worth a trip to a good mechanic.
Once you know which cylinder(s) is/are misfiring, you'll know exactly what to attack.
What brand plugs did you use?
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https://www.ford-trucks.com/forums/5...t-come-on.html
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what year... Is this a push rod engine??? newer modular???
Maybe I missed it I dont know.
Sounds like the old chevy LT1 issue's. Distributer behind the water pump, down low, and a deep puddle will always cause problems...
One might assume its a Ford since your on a Ford Forum but?????
Maybe I missed it I dont know.
Sounds like the old chevy LT1 issue's. Distributer behind the water pump, down low, and a deep puddle will always cause problems...
One might assume its a Ford since your on a Ford Forum but?????
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Thank you for all the great replies!
The truck is a 1999 F250 5.4L... unfortunately, lol.
I have gone to autozone, which a buddy said had a scanner which could read pending codes. Their scanner found nothing at all.
The plugs are motorcraft replacements, not aftermarket. Also, there wasnt any moisture trapped in the boots (from what I could see atleast).
I have a pretty tight budget, so buying an on-board scanner isn't really an option for me, but I appreciate the suggestion.
I wish I could find more information about the "black thing" I'm trying to describe. I don't know what words to use to search for it, and haven't been able to find a picture of it either. Later tonight I will try to post a picture of both the OEM and the replacement that I have.
Thanks again everyone!
The truck is a 1999 F250 5.4L... unfortunately, lol.
I have gone to autozone, which a buddy said had a scanner which could read pending codes. Their scanner found nothing at all.
The plugs are motorcraft replacements, not aftermarket. Also, there wasnt any moisture trapped in the boots (from what I could see atleast).
I have a pretty tight budget, so buying an on-board scanner isn't really an option for me, but I appreciate the suggestion.
I wish I could find more information about the "black thing" I'm trying to describe. I don't know what words to use to search for it, and haven't been able to find a picture of it either. Later tonight I will try to post a picture of both the OEM and the replacement that I have.
Thanks again everyone!
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This may sound simple but...
Check the plugs to make sure they are the right ones for your truck,
Check there gap. The wrong gap will do what you are describing.
Any plugs showing other then normal burn, say black, white ashey type build up. Check those cylinders compression.
I had a pesky miss. not really a hard miss but just enough to make me know its was there. I was doing a tune up, found 1 black plug, 30psi in that cylinder. The computer tried to compensate, but at 30 psi there aint much more it can do.
These newer engines like the correct plug. Platnum, double or triple.
Check the plugs to make sure they are the right ones for your truck,
Check there gap. The wrong gap will do what you are describing.
Any plugs showing other then normal burn, say black, white ashey type build up. Check those cylinders compression.
I had a pesky miss. not really a hard miss but just enough to make me know its was there. I was doing a tune up, found 1 black plug, 30psi in that cylinder. The computer tried to compensate, but at 30 psi there aint much more it can do.
These newer engines like the correct plug. Platnum, double or triple.
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New User
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I remember verifying the plug parts number and gapping them when I put them in, so that's not likely the problem. The ones they replaced looked healthy with little to no deposits and no corrosion or detonation indications.
Im really surprised that someone else has not run into this query about the "black thing" resistors or whatever they are!
Im really surprised that someone else has not run into this query about the "black thing" resistors or whatever they are!
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Joined: May 2007
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From: the woodzies
sounds like what happened to mine. I had water in the plug holes. To fix it it is a PITA but its easy. Pull all the cops and using some compressed air blast the water out. make sure you check all of them. if you dont have a compressor try shoving towels down there. Just make sure they are completely dry