Being a mechanic for some 35 years. I,ve always found that taking time to work with and understand spark plugs. A lot can be gained not only in the power catogory but also in gas milage which means the world with todays fuel prices. My question is. I want to index the plugs but not to knowledgeable on my Ford 4.2 V-6 valve layout. Can you tell me? Do I want the open end of the plug at 12 o-clock? 6 o-clock or? I know we used to put the opening of plugs on big and small block Chevys for dragracing at 12. Also Ford calls for 52-56 thousands on the gap but wonder your thoughts on opening them to 60 maybe as high as 70 to increase the sparks duration of fire. But I dont know if the ignition can produce enough power to fire the plug long enough to burn more of the cyl fuel. I know when I close up to 50 and down, the power is up but fuel milage drops noticeably. Also wonder about the air intake. Right now ford has the filter housing going into the drivers inner fenderwell which to me doesnt seem like enough air and certainly the more air the better burn. Thanks Randy Havlicek
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Re: Indexing plugs on a 2003 F-150 4.2 V-6
For gapping this particular 4.2 v-6 the proper gap you want to be at is 54 this is proper gap anything less or anything motor with make you engine run rough
you dont want to have too much fuel in the piston block unless you plan on drag racing your truck and then want to do a complete piston tear down after ran 54 gap is perfect balance for spark plug gap and fuel effeciancy
now if you want a better fire i would go with a split spark to help with increase spark in plug
with the filter assembly they make a converstion kit that goes under the front bumper as a scoop to give more air to the engine it just bolts up to bumper if your looking for more air this would be it
out on after market there is a fuel saver device that connects your trucks computer and you can program it for kind of driving fuel milage you need threw the jeggs catalog its a nifty device i have one and i get on a tank an better average of 50 more miles out saving and you can set for hauling or racin i think this is what you will be more needing
on setting the sparky at a 12 oclock position this is something new too me i have just heard of even though i work with the hibilie racing team for more than 8 years
i would like to hear more of this 12 oclock setting as this is new too me iguess some secrets are left to the mechanic crews can you give me discription to my email about this at email@example.com i would appreciate it thank you
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Without a look under the bonnet sorry hood i couldnt tell you ,yes your getting power to the coils but it may not be sparking due to the immobilisor system as this breaks the earth return circuit ,i think the best bet is to ask a local mechanic to have a look for you ,also you havent stated the year of the vehicle as this can help to decide a answer for a question as vehicles do differ with different years of manufacture although the smae model
what year and how many miles? check engine light on? problem could be as easy as a spark plug wire loose or broken. so first check for broken or loose spark plug wires check them close with your hand. u can also check at night time with the engine running, watching for an out of place spark. next i would check the spark plugs, remove and inspect for proper clearances. still no luck u can do a compression test on each cylinder. fuel delivery could also be a problem but a little more complicated to check. u could always put some fuel injector clean in ur fuel tank. ps if u take ur spark plugs out look at the spark plugs tips. compare the spark plugs with a spark plug condition chart. also always use anti seize compound on the threads of your spark plug before installation.
and engine needs fuel, spark and air to run. If you are sure you have fuel and spark, the timing is the last thing to check. Your engine is provided with external alignment marks. take out all of your plugs, and by hand, turn your engine over until you see your harmonic balancer (pulley your belt is on at the bottom of the engine/crank) alignment marks meet with the marks on the engine block. Next you need to look at your cam gears. You might have to pull a plastic cover, or the valve cover off to see the cam gears. The cam gears have alignment marks as well. If all marks line up together at the same time, timing is not the issue. the timing belt is an iffy design. The timing belt tensioner could be warn out and only show signs or being warn out every now and then. your tensioner could have loosened up, caused your belt to jump, and clamp back again.
I have a 2001 Stratus with the 2.7L V6. From what I understand, the engine compartments are very similar. When I change the rear spark plugs, I have found that I need to use a spark plug socket on a 6" extension, with an elbow socket. There isn't enough space in the engine bay to get straight over the spark plugs, and I have yet to find an easier way than simply using a elbow socket.
When installing new spark plugs, it's always a good idea to use a small amount of anti-seize on the threads.
find a friend who has purchased an obdII diagnostic reader and he can hook it up find out what caused it, then reset it..but there's no guaranty that the problem wont come back...or you can purchase a really cheap one for about $70 i think but all the do is reset the light. I bought the second best one they had at Autozone a couple years back, cost me $120 they had one for $150 like the car mechanics use with a disagnostic graghing page... but what i have works just fine. I"ve already used it four times on two autos...i had spark plug error (loose plug wire) and two fuel purge system errors ( found gas cap not on tight) and just recently coolant temp sensor error, i just reset it last week and it hasn't come back.
DO U UNDERSTAND THE MEANING OF "OUT OF PHASE"?? IT IS THE MECHANICAL TIMING OF THE SIGNAL FROM EACH SENSOR TO THE ENGINE CONTROL COMPUTER, WHAT IS THE CODE? ALSO TELL YOUR DAD (NICELY) THAT ATROUBLE CODE DOES NOT ALWAYS MEANS A FAILED SENSOR, ONLY A PROBLEM WITH THE SIGNAL, THAT CAN BE THE WIRING, IT CAN BE MECHANICAL OR IT CAN BE THE SENSOR, MANY POEPLE DON'T GET THAT AND SPEND TON'S OF MONEY CHASING CODES.I HAVE DONE THIS FOR 35 YEARS AND AM SURE OF WHAT I AM SAYING 100%