DO NOT use a test light to check injectors. Use what is called Noid light . And will tell you if the is firing an injector .
21 - 26 of 26 Posts
Welcome to my world! I’ve been fighting P0301/P0300 on my 2007 (classic) 5.3 for months. Same engine as the 1999-2006 Silverado.
My engine light came on the morning of 1/17 when I started the engine. So I, being cautious, shut it down and had it towed to a mechanic in town. They told me it was misfiring on #1 and #8 and needed new plugs/wires. Cool!!! I replaced with OEM plugs and wires. (~$200) Started up. No change to the results.
Took it to a dealer who checked it over and assessed “something is wrong inside the motor”. (DUH!)
They quoted me $8K+ to rebuild or $9800 to replace the motor.
I decided if it’s that bad, I would see if I could find the issue(s). Worst case, I’m replacing the motor. (Not at the dealership price)
I replaced the MAF and it got a little better. Now, I’m only getting P0301 AND P0134.
Replaced fuel injector #1. No change
Replaced ignition coil #1. No change.
(One at a time) swapped - plug, wire, coil, injector - #1 and #2 - still P0301/134
Replaced intake manifold gasket. Still P0301/134.
Replaced Oxygen sensor Bank01. Still getting P0301 and an occasional P0134.
Replaced valve cover since my valve cover is the one with the PCV valve built in to the valve cover. Still P0301!
Ran top engine cleaner through it…BETTER! But P0301 came back up.
Now, I am convinced I have a camshaft/lifter issue with my motor. I guess the dealership was right? Given the cost of having this done, I am researching the best place to have the engine replaced. I have no confidence trying to replace the camshaft and lifters on my own.
SHOULD HAVE STARTED WITH THIS*
FYI in my research I came across this GM Service bulletin, which is why I ran the too engine cleaner.
You might want to check if this might be the cause of your issue.
Before you end up being a Platinum member of the local Auto Parts Store like me.
Best of luck!!!
Sent from my iPhone using Tapatalk
My engine light came on the morning of 1/17 when I started the engine. So I, being cautious, shut it down and had it towed to a mechanic in town. They told me it was misfiring on #1 and #8 and needed new plugs/wires. Cool!!! I replaced with OEM plugs and wires. (~$200) Started up. No change to the results.
Took it to a dealer who checked it over and assessed “something is wrong inside the motor”. (DUH!)
They quoted me $8K+ to rebuild or $9800 to replace the motor.
I decided if it’s that bad, I would see if I could find the issue(s). Worst case, I’m replacing the motor. (Not at the dealership price)
I replaced the MAF and it got a little better. Now, I’m only getting P0301 AND P0134.
Replaced fuel injector #1. No change
Replaced ignition coil #1. No change.
(One at a time) swapped - plug, wire, coil, injector - #1 and #2 - still P0301/134
Replaced intake manifold gasket. Still P0301/134.
Replaced Oxygen sensor Bank01. Still getting P0301 and an occasional P0134.
Replaced valve cover since my valve cover is the one with the PCV valve built in to the valve cover. Still P0301!
Ran top engine cleaner through it…BETTER! But P0301 came back up.
Now, I am convinced I have a camshaft/lifter issue with my motor. I guess the dealership was right? Given the cost of having this done, I am researching the best place to have the engine replaced. I have no confidence trying to replace the camshaft and lifters on my own.
SHOULD HAVE STARTED WITH THIS*
FYI in my research I came across this GM Service bulletin, which is why I ran the too engine cleaner.
You might want to check if this might be the cause of your issue.
Before you end up being a Platinum member of the local Auto Parts Store like me.
Best of luck!!!
Sent from my iPhone using Tapatalk
21 - 26 of 26 Posts
