cylinder 5 misfire

[macksdaddy77]

got my bluetooth scanner in the mail today and immediately hooked up to torque pro.. well i had 4 codes.. catalytic, MAF, thermostat and cylinder 5 misfire.. cleared them and only one that comes back is misfire.. glad i found it.. i guess a single cylinder misfire can rule out a coil right?? ill change plug and wire tomorrow. any other ideas? guess its just a process of elimination...

[nos4blood70]

Swap the coils around and see if the misfire follows the coil.

[macksdaddy77]

gotcha. ill b messing around with it tomorrow. ill be changing the plugs anyways so works out. pulled one of the front 3 and they r rusty and electrodes look fine.. but still changing them out. not worth the risk

[Q-Ship]

It could also be a faulty injector. Move it around, too, and see if the code follows.

[macksdaddy77]

yea . ill start w plugs and wires.. then coils, if its still stumbling ill check icm and injectors.

[macksdaddy77]

well number 5 was pretty nasty lookin.. ran a little better.. still pulled a flashing ses.. ill change the wire aswell... clean the coil points and get them all done

[macksdaddy77]

here is cylinder 5 plug.. havent been able to change rest yet or wire as started raining.

[david]

cool,looks like you wont have to pull an injector.

[macksdaddy77]

yea, it has delphi wires currently, ill replace it with my beldens and see what happens when the weather clears

[spoiledred94]

The woman across the street has guys working under tent here. I'd like to hear how its running. If that is the insulator in #5 plug it looks good for the blame.

[macksdaddy77]

I changed plug and wire and still misses... not as bad.. but still pretty bad...

[crash93ssei]

It it a constant miss, only at idle, or only while under load?

[spoiledred94]

have you had the fuel rail off before?

[macksdaddy77]

Only under load. . Under boost.... never had it off.. plugs look like I'm getting fuel.. even number 5

[crash93ssei]

That is usually a bad plug or wire, is it only cylinder that is throwing the code?

[quicksilver]

Have you tried swapping the coils around yet? All the carbon build up on the plug shows that the injector seems to be working. I wonder if the coil is bad and it can't cause the plug to fire under load. This can happen, since the boost increases the pressure in the cylinder, there would be a lot of pressure to overcome to create proper spark.

[macksdaddy77]

Yea it's the only cylinder pulling a code... and I was under the assumption that of a coil went bad it wuld make 2 cylinders throw a code. Is that not always. Cuz I'll Def give it a shot.

[crash93ssei]

I just had a coil fail on my and was only dead for cylinder #2.

[DaMaroon]

AFAIK one plug fires when current flow begins(rise) and the other when it stops(collapse). Collapse is usually stronger so a week coil might have one plug have problems first.

[macksdaddy77]

Well switched coils and the misfire followed the coil... bought a new coil and good as new ... finally lol. Thanks guys