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Throwing codes

M

max harris

New member
I have a 2003 Bonneville that's throwing a P0300, P0301, and P0201 code. I have replaced the coil pack, plugs and wires and the injector in #1 cylinder. Before replacing any parts I had the P0301 and P0201 code. With new plugs, wires and injector I got the P0301 and P0300 code yesterday. Today I replaced the coil pack and I'm getting the P0201 and P0301 code. I know it's a Bonneville, but it has an L36 in it. Thanks for any help.

Max
 


make sure the plug wires are on right. then check over the icm harness make sure its ground is tight and still connected.

then you can swap the coils around to see if the misfire follows the coil swap.

the injector, check the wires to it was well. and you can also pop the fuel rail off and swap the injectors around to see if that code follows the swap as well.
 
Scottydoggs said:
make sure the plug wires are on right. then check over the icm harness make sure its ground is tight and still connected.

then you can swap the coils around to see if the misfire follows the coil swap.

the injector, check the wires to it was well. and you can also pop the fuel rail off and swap the injectors around to see if that code follows the swap as well.
Click to expand...

Everything has been replaced with new plugs, wires, injector and coil pack.
 
Update, took the car to a local shop, they said it was a dirty MAF and cleaned it. It ran fine friday coming back the couple of miles to the house. I took it to work today and got codes of P0300, P0301, and P0102 for the MAF. Looks like it needs a new MAF. Any other thoughts.
 
check the fuse box for a blown fuse, its for the maf.

get a junk yard maf, oem works best, they go for like 40 used with a warranty. top of the maf is the part #.

icm could be the misfires.
 


Scottydoggs said:
check the fuse box for a blown fuse, its for the maf.

get a junk yard maf, oem works best, they go for like 40 used with a warranty. top of the maf is the part #.

icm could be the misfires.
Click to expand...

Thanks Scottydoggs, got the problem solved. Swapped the MAF from my GP to the Bonnie and cleared the codes. The Bonnie still had a misfire, once the weather cleared enough down here I took the ICM to the parts store for testing. Although it passed the tests it was very slow on a few. Picked up a replacement and the problem is gone. Local mechanic, I'm just glad I didn't take it back there.
 
Unfortunately the P0201 and the P0301 code came back today, Running out of things to check with the tools I have. Plugs, wires, coil pack, injector and ICM all new. Anybody have more ideas.
 


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