P0303

I bit the bullet and bought a code reader and this is the code that I got p0303, I erased that and it came back. I have replaced the plugs and that was the plug I thought was the problem, anyway the code reader verified it. Could it be the injector the wire or something else. This happen all of a sudden this misfire.

Any thoughts.
Also had p0446 erased that and it never came back.

Jeff

I bit the bullet and bought a code reader and this is the code that I got p0303, I erased that and it came back. I have replaced the plugs and that was the plug I thought was the problem, anyway the code reader verified it. Could it be the injector the wire or something else. This happen all of a sudden this misfire.

Any thoughts.
Also had p0446 erased that and it never came back.

Jeff

Year and engine and mileage would help?
Is the engine actully missing?
Can you tell which cylinder the miss is on?
What kind of plugs did you use?
Are you getting good hot blue spark to the missing cylinder?
MT

Sorry its a 2002 Pontiac Montana with 150,000 kms. I have replaced with bosch spark plugs and the plugs that i took out were worn out but number 3 cylinder plug was really bad shape(fouled up). The van is shuddering and lacking power and hard on gas. It's like a dead cylinder, can I try a spark plug wire from my father's chev s-10 v6 truck to tell if it's the wire's gone before i buy them?

Jeff

Sorry its a 2002 Pontiac Montana with 150,000 kms. I have replaced with bosch spark plugs and the plugs that i took out were worn out but number 3 cylinder plug was really bad shape(fouled up). The van is shuddering and lacking power and hard on gas. It's like a dead cylinder, can I try a spark plug wire from my father's chev s-10 v6 truck to tell if it's the wire's gone before i buy them?

Jeff

You could try another plug wire or just switch plug wire and or plug from another cylinder but also check the coil output for good spark.
The bosch plugs do not run good in GM.
I would take them back and ask for your money back on them or just drop them in the trash can.
You need to use the AC delco plugs the good book calls for.
Test for good hot spark from coils and to spark plugs.
Let us know how it goes.
MT

I replaced the wires and everything is fine now, the van works better than ever and no more codes. Thanks to everyone for your help.

Jeff

I replaced the wires and everything is fine now, the van works better than ever and no more codes. Thanks to everyone for your help.

Jeff

You are welcome and.
Thanks for posting back and letting us know how it went.
Glad you got it figured out.

But remember you need to get them bosch plugs out and some AC delco plugs in it.
Bosch plugs just do not do well in a GM. :grinyes: :lol:
Good luck MT