cylinder number
#1
cylinder number
I have a P303 code indicating a misfire on cylinder 3. Coincidently I recently changed the spark plugs, so I will check out the one in cylinder 3. However I don't know which cylinder is number 3. Anyone know? Thanks.
#5
If you recently changed your plugs then your mileage is probably getting up around the point where Ecotec's throw the misfire code...there are a lot of threads on the subject and it often indicates you have a burnt valve (in this case in Cyl 3) which requires the cylinder head to be removed, valve job and new valve or valves in Cyl 3, costing $1000-1500 depending on what parts you change.
The ONLY way to check for a burnt valve is a simple compression check. You can buy a compression guage cheaper than garages will charge you for the test. I got 180 psi in 3 cylinders and 90 psi in the one with the burnt valve. Drove with CEL on for 30,000kms, then the idle got rough, then I checked compression and finally had to bite the bullet and take it to the machine shop...now it runs perfect!
The ONLY way to check for a burnt valve is a simple compression check. You can buy a compression guage cheaper than garages will charge you for the test. I got 180 psi in 3 cylinders and 90 psi in the one with the burnt valve. Drove with CEL on for 30,000kms, then the idle got rough, then I checked compression and finally had to bite the bullet and take it to the machine shop...now it runs perfect!
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