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Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 16107
Experience:  15 years GM master tech
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Began with P0306, loss of compression on #6 because of bent

Customer Question

Began with P0306, loss of compression on #6 because of bent valve and cracked intake.
Submitted: 1 year ago.
Category: Chevy
Expert:  Gary replied 1 year ago.

I am sorry your having this problem

is # ***** dead at idle or misfiring at idle or only when driving it ?

there were NO 300 codes before the work was done ?

Customer: replied 1 year ago.
I crossed some plug wires and resolved that. Now, I'm getting a P0303 only.
Customer: replied 1 year ago.
Is it possible the valves are out of adjustment on the #3?
Expert:  Gary replied 1 year ago.

is it setting this code at idle ? can you feel the miss ?

and your sure the firing order is correct ?

new cap ?

where these valve adjustable or just torque down style ?

Customer: replied 1 year ago.
Code at idle, feel the miss, torque style (hydraulic) lifters.
Customer: replied 1 year ago.
Replaced the cap, plugs and wires when the P0306 began.
Expert:  Gary replied 1 year ago.

ok right off the bad we had alot of issues with bad or defective caps right out of the box

can you first try another new cap ?

if it still misfires pull that bank of plugs and what are all 4 cylinders reading for compression ?

Customer: replied 1 year ago.
I'll have to get back on that....
Expert:  Gary replied 1 year ago.

ok if the compression on that bank is all reading the same this issue is going to come down too a vacuum leak or rocker that fell off or push rod that has broken or fell out and if that checks out the only thing left is a cap OR an issue with the # ***** injector

you can always get me back for FREE through this post with any follow up with this question anytime as i do not get credit for my work until you rate us here

Customer: replied 1 year ago.
I have no knocks just a slightly rough idle.
Expert:  Gary replied 1 year ago.

ok see if the compression is good and there are NO vacuum leaks

Customer: replied 1 year ago.
Any place specifically to look for a vacuum leak?
Expert:  Gary replied 1 year ago.

in area of the # ***** cylinder since /# ***** is the one misfiring