Misfire on Cylinder 6? It's not plugs, COP or Injector...
#16
05-13-2009, 01:35 PM
http://www.performancedistributors.com/soscoils.htm
#18
05-13-2009, 03:13 PM
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I have the similar problem on a 2001 F-150, 4.6, 2whl, 110k miles. Was getting very bad jerking when accelerating, especially at low RPM (like after it shifts to next gear). Last week I finally took it to the dealer. They replaced COP and plug on cylinder 1, $381 dollars later and it ran fine for 4 days. Then a few days ago it started to jerk every once in a while when accelerating, but then today I could barely make it up a hill with so much jerking. I took it back to the dealer and they told me it was now cylinder 6 coil gone bad and want $235 to replace AND mentioned there was browning in that cylinder signifying some water there????
I asked why it didn't show up on diags last week but no solid answer worth mentioning here... my thought is to replace the plug and coil myself for $63 but after reading some of these posts makes me wonder if we are guessing and if cyl 6 is really the issue. I searched ebay for the coil set but nothing there but one used set....
any suggestions would be appreciated.. thanks
I asked why it didn't show up on diags last week but no solid answer worth mentioning here... my thought is to replace the plug and coil myself for $63 but after reading some of these posts makes me wonder if we are guessing and if cyl 6 is really the issue. I searched ebay for the coil set but nothing there but one used set....
any suggestions would be appreciated.. thanks
These would probably work for you. I did a search for DG508 and found them:
NEW IGNITION COILS 97-06 FORD F150 F-150 V8 DG508 (8):eBay Motors (item 120419418208 end time Jun-10-09 21:18:41 PDT)
Bunggo
#19
05-13-2009, 03:30 PM
Cargo Master
I bought a set of these COPS and plan to install them in the near future. I expect them to cure my random high load misfire problem. By the way, this company is an FTE sponsor and they provide a discount to FTE users.
http://www.performancedistributors.com/soscoils.htm
http://www.performancedistributors.com/soscoils.htm
Anyone think there's a reason to change when there isn't a problem????
"stronger spark"
do they get weaker or just go?
#20
05-13-2009, 03:39 PM
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Well, I don't know for sure, but I believe they just go. It doesn't put you out though. I drove on mine for a few weeks. It's still not good though because it drives your gas mileage down. I could be wrong, but I don't think new ones give you a better spark or anything of the sort. They should last forever and do in most cases. So, I wouldn't buy them just to have them.
#21
05-13-2009, 04:38 PM
What happens as the COPs age, is that the coil windings short out. What causes this is the spark plug gap can get substantially more than the specified gap as the plugs wear. The increased gap causes the coil to overheat which results in coil output being too low to fire the plug. The overheating of the coil causes windings of the coil to short reducing the overall output of the coil. With less output and high engine loads, the coil begins to no longer produce enough output to fire the plug. This is felt by the owner as bucking in the 45 - 55 mph range.
#22
05-13-2009, 04:50 PM
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What happens as the COPs age, is that the coil windings short out. What causes this is the spark plug gap can get substantially more than the specified gap as the plugs wear. The increased gap causes the coil to overheat which results in coil output being too low to fire the plug. The overheating of the coil causes windings of the coil to short reducing the overall output of the coil. With less output and high engine loads, the coil begins to no longer produce enough output to fire the plug. This is felt by the owner as bucking in the 45 - 55 mph range.
Certainly a much better answer than my own!
#23
05-13-2009, 05:01 PM
Cargo Master
KingRanchMan02
thank you. so is what they say on their site pretty much bunk or can the increase voltage help at 105k miles? and would this only help if i increased the gap? I'm all about saving money and leaving it alone if it's not going to help. thanks for the advice and patience.
Rob
thank you. so is what they say on their site pretty much bunk or can the increase voltage help at 105k miles? and would this only help if i increased the gap? I'm all about saving money and leaving it alone if it's not going to help. thanks for the advice and patience.
Rob
The SOS Coils are designed with increased windings to boost spark output up to
40,000 volts! That is a 60% increase in spark energy over the 25,000 volts produced by the stock
coils. The higher voltage along with increased spark duration will allow plug gaps to be opened up
to .065". This larger gap exposes a hotter spark in the combustion chamber for an increased burn
of the fuel mixture, resulting in more horsepower and better fuel economy. Additional benefits
include quicker starting, smoother idle and greater throttle response.
40,000 volts! That is a 60% increase in spark energy over the 25,000 volts produced by the stock
coils. The higher voltage along with increased spark duration will allow plug gaps to be opened up
to .065". This larger gap exposes a hotter spark in the combustion chamber for an increased burn
of the fuel mixture, resulting in more horsepower and better fuel economy. Additional benefits
include quicker starting, smoother idle and greater throttle response.
#24
05-14-2009, 09:27 PM
KingRanchMan02
thank you. so is what they say on their site pretty much bunk or can the increase voltage help at 105k miles? and would this only help if i increased the gap? I'm all about saving money and leaving it alone if it's not going to help. thanks for the advice and patience.
Rob
thank you. so is what they say on their site pretty much bunk or can the increase voltage help at 105k miles? and would this only help if i increased the gap? I'm all about saving money and leaving it alone if it's not going to help. thanks for the advice and patience.
Rob
#25
05-14-2009, 09:29 PM
#26
03-25-2010, 09:46 PM
This all sounds familiar. Flashing CEL. Mechanic replaces COP, says all is OK. Drive 2 blocks, light back flashing. Go back, they change injector. It still runs rough. They check compression and it is at 70 PSI and they are looking for 160. They give up and say go to dealer. Any thoughts ? I posted the final story, which I hope is not a new engine for an 03 with 110,000 miles.
#27
03-25-2010, 10:06 PM
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This all sounds familiar. Flashing CEL. Mechanic replaces COP, says all is OK. Drive 2 blocks, light back flashing. Go back, they change injector. It still runs rough. They check compression and it is at 70 PSI and they are looking for 160. They give up and say go to dealer. Any thoughts ? I posted the final story, which I hope is not a new engine for an 03 with 110,000 miles.
You probably didn't need the new injector.
#28
03-25-2010, 10:55 PM
The mis-fire was on #1. They just replaced that one COP. I was reading that elsewhere about the code lying about where the mis-fire occured. I thought when the code was read the 2nd time it showed an injector problem. But, you are probably right. I should have had them do all the COPs/plugs/wires. At 110,000 miles they are due. It is sitting at dealer now, until Monday. I'm worried, more about the low compression reading of 70, which does not seem related to COP/plugs/wires. More like piston rings or cyl head.
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