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...

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

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-Car Guy Carl
"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles

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

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

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2001 Backroad Bonneville SSEi

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

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

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

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

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What does it profit a man to gain the whole world and lose his soul.

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

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.

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2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked


Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me

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

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

_________________
Ryan

2003 Bonneville SSEi - The Black Mirror SOLD!
2002 Bonneville SE - The Mutt Complete 2004 SLE interior, drivetrain, and body harness swap, ECC swap, HUD swap, black GXP wheels, GXP headlights and tinted tails - SOLD
2003 BMW 540i M Sport, 2001 BMW X5 4.4i, 2010 GMC Acadia, 2017 Grand Design Imagine 3150BH
1982 Cutlass Supreme - The fun one

have you had the fuel rail off before?

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2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked


Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me

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

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

_________________
Ryan

2003 Bonneville SSEi - The Black Mirror SOLD!
2002 Bonneville SE - The Mutt Complete 2004 SLE interior, drivetrain, and body harness swap, ECC swap, HUD swap, black GXP wheels, GXP headlights and tinted tails - SOLD
2003 BMW 540i M Sport, 2001 BMW X5 4.4i, 2010 GMC Acadia, 2017 Grand Design Imagine 3150BH
1982 Cutlass Supreme - The fun one

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.

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1995 Jeep Cherokee Country- 200,XXX miles and running strong. 4.0L paired with a 5 speed manual. 4.5" long arm lift with 32" tires and regeared to make up for power. Best of all, shes a fire engine red!

2000 Bonneville SSEi- 145,XXX miles, bonestock for the time (don't hold your breath, it might be a long while)

Typos courtesy of LG Optimus G- yes, I do most of my trolling with my phone. Don't judge me.

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.

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

_________________
Ryan

2003 Bonneville SSEi - The Black Mirror SOLD!
2002 Bonneville SE - The Mutt Complete 2004 SLE interior, drivetrain, and body harness swap, ECC swap, HUD swap, black GXP wheels, GXP headlights and tinted tails - SOLD
2003 BMW 540i M Sport, 2001 BMW X5 4.4i, 2010 GMC Acadia, 2017 Grand Design Imagine 3150BH
1982 Cutlass Supreme - The fun one

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.

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