hey guys, I have a truck f150 v6 2004. it's giving me the codes p0316,p0300,p0302,p0303.

I check for spark on plug #1 did no have it, so I replace the ignition coil. With no luck. also replaced the plug wires, same result. What could cause missfire on cyl.#2 and cyl #3. Any ideas?

 

Well how many miles are on the truck and when was the last time (if ever) were the plugs replaced?

Also do you have the 4.6 or 4.2 V6?

 

P0300 is a random multible misfire detected. P0316 is misfire detected on startup (1st 1000 revs.) I would recommend getting or borrowing a powertrain and Emission Control shop manual and follow the diagnostic routine for the codes mentioned. As to what could cause the codes or misfires, there are a number of things that could be the cause. It possibly could be a bad coil, plug, boot, fuel injector, or even fuel pump. It could also be a problem with the wiring harness for those coils. The easiest and quickest way to diagnose the problem is to follow the routine in the shop manual. Fixing the problem should be easy. Finding it will take a little more effort.

 

4.2 engine. I replaced the ignition pack. I will replace spark plugs tomorrow. what 's bother me is that two cyl. missfired. do you now the firing order?
Thkx.

 

I do not know the firing order. That info is in the shop manuals.

 

the firing order for the 4.2L is

1-4-2-5-3-6