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check for 1- vacuum leak 2- spark plug gap being widen or spark plug wire shorting to ground due to old age or close to heat source like touching exhaust manifold 3- your coil pack(there might be one of the bad,check for internal resistance) 4- check idle air control make sure there is no carbon build up on pintle 5- finally check your EGR valve,make sure it hold vacuum.also it is clean with no carbon build up on the valve or passage to intake manifold
Sounds like your carburettor settings are wrong. Evidence of sooty spark plugs points to that very clearly. Suggest getting a technician to give it a good going over. However, as an after-thought, you might just want to remove the air cleaner first just to see if that makes matters better. If it does, then it's almost certain you have a blocked (or very dirty) air-filter. Good luck.
there should be 6 coils 3 on the front and 3 on the back(front ones may be hid by the plastic peice that says 3.0 24 valve), just take 2 bolts per coil pack out and there will be a 6 in coil going down into the valve cover to the spark plug
For the 3 spark plugs in front:
1. You would have to remove the plastic protective cover (this cover is silver&red w/ the words "nissan and v6 3000")
2. unplug connector and remove coil (DO NOT mix up the coils, keep the same coils on the same cylinder)
3. Remove spark plug
Rear 3 plugs: located on the rear of the intake (the black pipes atop the engine). there are 3 openings at the rear of the black intake pipes, each opening has a coil mounted.
1. Unplug coil connector and remove coil
2. remove spark plug (you'll need a long extension)
***Installation is reverse, be sure not to over tighten the plugs!! Use anti-seize compound on all the new plugs threading. Hopefully this helps!!
Way too much fuel going through the engine. Check for plugged air filter and blocked air passages to and from the air filter. The O2 sensor(s) could be past worn out. If the check engine light is on, take the car to Autozone or similar business to get a free read of the computer. Good luck!
you have 6 spark plugs, i would recommend the NGK v-power spark plugs for your car. the average cost on those type of plugs are $4.59 each so you would need 6 of them. i always replace spark plug wires everytime i buy new spark plugs however your particular car is what they call Coil-on-plug wires and are very expensive. you would have over $100.00 or so in 6 of these total, i would not replace these on your car unless you are having a major mis-fire and possibly need them.
if our coil is sparking and good plug ive seen manny time carbon loose and sticking on the valve valve stay open doesnt build up compression = missing check our coil if its firing go on the road rev the engine like leave it in 2nd gear drive like that overreving the engine might loosen the carbon dont rev it to mush it cost nothing to try that and it work for me a few time pierre