Misfire

[rusty ol ranger]

Nope... none of the evap or emissions stuff would. That's what I'm trying to explain to him. Single cylinder codes have to be something that ONLY effects one cylinder. Valves, compression, spark, or fuel injector.

The pcv system is unrelated but oil in the intake and throttle body is a clear symptom that the system has reversed because the valve is stuck.

If hes checked fuel and spark all thats left is compression. Thats why i suggested it lol

 

[Maine Ranger]

I mentioned it doesn't happen all the time ..Starting it and below 2000 rpms is when it is crappy after that it runs as normal .....the oil is old i am thinking that it happen before i bought it......dunno

 

[alwaysFlOoReD]

Try moving the spark plug over and see if the miss follows it. Same with the sparkplug wire.

 

[fastpakr]

I mentioned it doesn't happen all the time ..Starting it and below 2000 rpms is when it is crappy after that it runs as normal .....the oil is old i am thinking that it happen before i bought it......dunno

I understand it's intermittent. What I'm asking is whether the computer always indicates that the misfire is on cylinder 3 specifically.

 

[Dirtman]

It's also waste spark. 3 coils, but each coil fires two spark plugs at once. One fires when it actually needs to ( end of compression stroke) and one is "wasted" by firing on the exhaust stroke. You can swap the coil around on those 2 cylinders and see if the miss moves to the other cylinder.

But still... like fastpakr said need confirmation that this is only happening on ONE cylinder and not a multi cylinder miss.

 

[Maine Ranger]

After it stops raining i am checking everything all over again ....I had problems with the fuel previously ..I have a foxwell coder an inexpensive one ..not sure it works very well let you guys know

 

[fastpakr]

If it's not always on the same cylinder, you could just be dealing with a misfire caused by oil fouling.

 

[Maine Ranger]

Up Date on my problem,,,,,My compression checked out all good ........I have serious evap issues the purge and canister is freakin shot

 

[Maine Ranger]

If hes checked fuel and spark all thats left is compression. Thats why i suggested it lol

she still has a rough idle in her at low rpm ????? canister and purge valve is shot