sputtering after sparkplug change
#16
well gentlemen, i put in the new plugs and took it for a test drive. everything was fine for about 10 miles then bang. back to sputtering on down the road. ggrrrrrr!! maddening! brought it back home and pulled all coils again to have a looksee. i turned the key on and tested for voltage at the coil wires. everything ok. samething happened last time. goes for awhile then back to sputtering. could it be coincidence that the fuel filter is dirty?? as a reminder i had the bosch plugs in and it was sputtering. i was on a long trip so i could not stop to remedy the problem. then it went away on its own but lower power telling me that the culprit plug was not firing at all. pulled the bosch plugs out then installed motercraft ones. ran great for 10 miles then back to sputtering. eventually if i left it like the before, it would stop sputtering but not be firing on whatever cylinder. is there a way to test the coil while its under load? even while idleing with it in drive or park you can hear it from the tailpipe sputtering. sounds like a slight pop or gust of air. seams like it would be loading up on fuel then firing causing the slight pop. no?? please tell me all suggestions however miniscule they may seem.
clarence
clarence
#17
Originally Posted by 00excdiesel
well gentlemen, i put in the new plugs and took it for a test drive. everything was fine for about 10 miles then bang. back to sputtering on down the road. ggrrrrrr!! maddening! brought it back home and pulled all coils again to have a looksee. i turned the key on and tested for voltage at the coil wires. everything ok. samething happened last time. goes for awhile then back to sputtering. could it be coincidence that the fuel filter is dirty?? as a reminder i had the bosch plugs in and it was sputtering. i was on a long trip so i could not stop to remedy the problem. then it went away on its own but lower power telling me that the culprit plug was not firing at all. pulled the bosch plugs out then installed motercraft ones. ran great for 10 miles then back to sputtering. eventually if i left it like the before, it would stop sputtering but not be firing on whatever cylinder. is there a way to test the coil while its under load? even while idleing with it in drive or park you can hear it from the tailpipe sputtering. sounds like a slight pop or gust of air. seams like it would be loading up on fuel then firing causing the slight pop. no?? please tell me all suggestions however miniscule they may seem.
clarence
clarence
Sounds like it's time to go to the dealer and let them hook it up to a Worldwide Diagnostic System (WDS) to tell which coil(s) it is. And, yes, the engine may need to be under load in some way...even if it means hooking it up to a trailer of some heft.
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#22
well, i was at the dealer for about an hour and $265 dollars later it was the number 3 coil. it showed it going flat on the diagnostic computer. that coil is the fourth one back on the passenger side. i pulled out the bosch plugs and when i looked at them very closely, i noticed that all the plugs were a light brown as they should have been but, one of them was light brown on the one side of the grounding electrodes,and black on the other side of the electrodes. where did the one come from? you guessed it, number three cylinder. i even mentioned that to the father in law this morning!! lucky guess?? coincidence??? maybe i have just entered the twilight zone........i would take a pic and show you guys so you can see too but this computer is running on windows 98 so i cant get the pics off the camera. maybe tomorrow.
anyway i am much happier now as you can tell. thanks for all the replies and i will be on again soon with more questions about more stuff. you guys pretty much nailed it with the coil going.
clarence
anyway i am much happier now as you can tell. thanks for all the replies and i will be on again soon with more questions about more stuff. you guys pretty much nailed it with the coil going.
clarence
#23
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44nneedit
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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07-11-2017 02:41 PM