PO300 missfire
#1
01-05-2012, 10:21 AM
PO300 missfire
I had a guy check the codes after the light went one and showed this code but when he checked what was miss firing he saw upward number movement on cylinder 3 only what can cause this and can this be really bad?
#2
01-10-2012, 11:18 PM
i had the same thing happen to me a few weeks back .thought i had a bad spark plug
or wire or coil pack .. turned out it was a bad fuel pressure regulator. if the car acts
like its missing on acceleration that could be a sign . my local chevy dealer fixed mine
for free ... government recall .call your chevy dealer.
or wire or coil pack .. turned out it was a bad fuel pressure regulator. if the car acts
like its missing on acceleration that could be a sign . my local chevy dealer fixed mine
for free ... government recall .call your chevy dealer.
#4
01-22-2012, 05:48 PM
i live in omaha neb. on 2 jan 2012 went out to start car then heard a loud boom .
it turned out fuel had been leaking into the intake from a bad fuel pressure regulator
causing an explosion . the explosion blew a hole the size of fist in the intake and shot
the engine cover 20 feet into the air. this only applies to 3800 v6 motors my monte is
a 2000. my dealer fixed everything for free the only thing i had to pay for was a new battery . now with your car being an 06 i dont think its covered in the recall because
if i remember right the 3800 v6 was replaced by the 3500 v6 that year.
it turned out fuel had been leaking into the intake from a bad fuel pressure regulator
causing an explosion . the explosion blew a hole the size of fist in the intake and shot
the engine cover 20 feet into the air. this only applies to 3800 v6 motors my monte is
a 2000. my dealer fixed everything for free the only thing i had to pay for was a new battery . now with your car being an 06 i dont think its covered in the recall because
if i remember right the 3800 v6 was replaced by the 3500 v6 that year.
#5
10-15-2016, 09:04 PM
PO300
PO403
PO405
PO446 ✴︎ ⬅︎ ⬅︎ ⬅︎
All these Codes were triggered by a faulty FUEL TANK PRESSURE SENSOR!
Wait for the Low Fuel Warning before attempting to DIY.
Start engine.
Pull FUEL PUMP Relay ... Let Engine stall to relieve pressure in system.
Remove GROUND Wire from Battery.
With car Raised and SAFETY STANDS securely in place.
Support Tank with Jack.
(I made a "Jig" to attach to the Jack. Sawed the square bottom off from Milk Crate. Drilled holes through Hockey Puck. Mounted Puck to center of Milk Crate with Heavy Duty Zip Ties. Affixed carpet to other side of Milk Crate bottom for padding.)
Lower tank enough to access Sensor atop Fuel Pump.
Unfasten Pigtail from Sensor.
Unclip and Remove Sensor ••• Straight-up.
DO NOT BREAK THE END OF SENSOR OFF INSIDE PUMP!!!
If you need a Charcoal Canister do it when you replace Sensor.
Removing Relay to releive Pressure throws a Code which may require a MIL Light reset.
PO403
PO405
PO446 ✴︎ ⬅︎ ⬅︎ ⬅︎
All these Codes were triggered by a faulty FUEL TANK PRESSURE SENSOR!
Wait for the Low Fuel Warning before attempting to DIY.
Start engine.
Pull FUEL PUMP Relay ... Let Engine stall to relieve pressure in system.
Remove GROUND Wire from Battery.
With car Raised and SAFETY STANDS securely in place.
Support Tank with Jack.
(I made a "Jig" to attach to the Jack. Sawed the square bottom off from Milk Crate. Drilled holes through Hockey Puck. Mounted Puck to center of Milk Crate with Heavy Duty Zip Ties. Affixed carpet to other side of Milk Crate bottom for padding.)
Lower tank enough to access Sensor atop Fuel Pump.
Unfasten Pigtail from Sensor.
Unclip and Remove Sensor ••• Straight-up.
DO NOT BREAK THE END OF SENSOR OFF INSIDE PUMP!!!
If you need a Charcoal Canister do it when you replace Sensor.
Removing Relay to releive Pressure throws a Code which may require a MIL Light reset.
Thread
Thread Starter
Forum
Replies
Last Post
