2000 Bonneville

[lawenforcer]

Hello. I am hoping to find someone that has had the same issue I am currently having with my 2000 Bonneville. Occasionally I start it up and it doesn't seem to want to go, like it cutting out... Then I go a half mile or so and it will quit and not act up anymore. It doesn't do it all the time. Maybe a couple times a week. The check engine will come on and blink while it's doing it then it just goes solid. I got my buddies code reader and it has one code after it done this, P0302, which i believe it is a misfire..its just confusing cause it only does it on occasion and never does it going down the road etc...only periodacally when i first start the car and start driving and then it quits...does anyone have any experience with this? I am really wanting to fix it so it don't get worse. Thanks for the help....

[nos4blood70]

That code is for a misfire on cylinder two. I would start with inspecting/replacing the coil, wire, and plug for that cylinder. My money is on the coil.

[lawenforcer]

Stupid question time. Which coil is cylinder 2 so I can know I'm looking/replacing the correct one. Is it common for a misfire such as this one to be such a periodic thing. I replaced the plugs with new ones and I got a used coil packs and board off my nephews 3800 that he wasn't using. Which doesn't mean it doesn't have the cylinder 2 coil pack bad on it. Just want to put all the info out there...

[Archon]

This shows the layout of the coils, wires, and cylinders. It's shows the supercharged engine, but the layout is the same for the naturally aspirated.

[The extension jpg has been deactivated and can no longer be displayed.]

Plugs and wires have been known to be bad out of the box. If the coils aren't marked with the cylinder numbers, they're aftermarket coils which can be iffy.

[1oldman]

Stupid question time. Which coil is cylinder 2 so I can know I'm looking/replacing the correct one. Is it common for a misfire such as this one to be such a periodic thing. I replaced the plugs with new ones and I got a used coil packs and board off my nephews 3800 that he wasn't using. Which doesn't mean it doesn't have the cylinder 2 coil pack bad on it. Just want to put all the info out there...

try this:
http://www.pontiacbonnevilleclub.com/fo ... il#p226936
- BC

[crash93ssei]

For a more intermittent miss like this I would suspect the plug wire. They move around and if they are bad they can arc through the insulation causing a random misfire.