NEW: intake gaskets, rear 2 O2 sensors, fuel pump ( was going anywyas ) , injectors, FPR , coolant temp sensor, plugs / wires TESTED OK : coils, map sensor, …
NEW: intake gaskets, rear 2 O2 sensors, fuel pump ( was going anywyas ) , injectors, FPR , coolant temp sensor, plugs / wires TESTED OK : coils, map sensor, …
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My friend has a GMC ENVOY ITS BATTERY DIED AND LOST MEMORY.IT HAD ONE BAD
COIL BUT THREW A PO300 code.I never got had a clue it was one cylinder.The
Gmc on board computer could not sense what cylinder.take my advice I never
thought it would be so elusive.get a live data scanner so you can read
whats going on and not feel like a schmuk like me…
i had the that problem and believe me is very depresing , after i expend
like 3,000 going from mechanic shop to the dealer and no one was able to
find out what it was. but finally i found a dealer in cary nc that has
profesional technicions and guess what it was……….”.relearn the
crankshaft sensor” i am not saying that will work for every body but i
worked on my truck! if you have P0300 you should look in to that becouse
that is what fix mi problem. good luck
am sorry to hear that u have that problem but i hope u have find the
solution is sad i have ia 2003 chevy 2500 hd and i have the same problem
and i just dont know how to fix that problem, i replaced the motor and did
all human posible and after the motor was replaced i still have that
problem. the other thing is i only get about 10 miles per gallon and afects
the transmition if u finded the cause please let me know becouse am getting
tired of chevy
how did you figure out they were weak?
How much is it to change the coils?
check the preasure regulator had one today that was leaking fuel into the
intake through the vac line. good luck
I have a 2004 2500HD 6.0 with the same problem. Still havn’t figured it
out. Get a better scanner that shows each individual cylinders with a
misfire count. In my case, it truely is random. The only other thing I can
think of since you have done almost everything else is: 1st. Do a
compression test on multiple cylinders. Possibly a bent/burnt valve. 2nd.
Plugged up Cats can also cause this, some shops/tech schools can do a
backpressure test.
Crank relearn..
@ilicklabia69 i hear ya man…check engine lights depress me too. I thought
i was the only one. that shit keeps me up at night. Hope you were able to
resolve. take care.
Water in the gas? Siffon that out to empty and check that there’s no water
in the fuel. Check all wiring for cracked sheaths and cracked connectors.
Did you check the ECM?
I’m having the same problem with my truck. did you ever figure out what it
was? Thanks
Keep a pack of wipes in the truck by. I use my 02 every day for work and
she’s CLEAN.
we had the same problem on my 97 chev silver. i found out it was too much
compression. it was stumbling as well. try running it with 91 gas instead
of 87.
my tahoe does that and found out that every coil on the passenger side of
the motor is bad
did you do a crank relearn?
spray some carb cleaner or ether around your intake manifold while at an
idle. They sometimes develop a small crack(plastic intake). If your idle
changes that’s your problem. It’s pretty common and costs around 280.00 to
fix.
how did you figure ou they were weak?
ya it was weak valve springs on cyl 3 and 6, put in all new springs and
retainers and problem was solved
i forgot about this video, i no longer have the truck , turned out it was 4
bad valve springs, i changed the valve springs and no more miss fires
mine was the exact same. I re learned the camshaft position sensor with a
GM Tech II scan tool and it has been fine ever since. i believe the
procedure is called ” Camshaft correlation Re-learn. “
check cam and crake sync and retard
I have s 99 5.3 and it throws the same code and has a rough idle, changed
coils, plugs wires, map sensor and throttle position sensor, starts fine
cold but slowly dwindles down to about 500 rpm and starts the random
missing and has a really hard time starting when its been running, can
anyone help??
@ilicklabia69 4.3?
My 04 mdx doing the same thing…change catalyst converter
@melocts My father had random misfires on all cylinders (P0300) and
transmission shifting problems. After five different places troubleshooted
it he found out that TPS wiring harness was bad (after replacing the TPS).
Also the IAT and CTS if flaky can cause problems especially with
transmission shifting. Lastly people need to check their exhaust manifold
for broken studs which can allow air into their exhaust screwing up the O2
sensor readings.
plugged cat