2001 2 door blazer bogging/hesitating
#1
10-20-2019, 07:39 PM
2001 2 door blazer bogging/hesitating
This is a 4.3 vortec engine and I’ve had the p0300 code for a while which is the random misfire. I’ve replaced all recommended parts included:
fuel pump
gas tank
fuel filter
spark plugs and wires
distributor with new cap
egr
cleaned maf sensor
exhaust w/ no cats (when I bought it, the cat was empty inside)
all of these are new and it’s still bogging down...I’m out of luck as far as I know.
SEND HELP PLEASE! Thank you!
Reply
fuel pump
gas tank
fuel filter
spark plugs and wires
distributor with new cap
egr
cleaned maf sensor
exhaust w/ no cats (when I bought it, the cat was empty inside)
all of these are new and it’s still bogging down...I’m out of luck as far as I know.
SEND HELP PLEASE! Thank you!
Reply
#2
10-20-2019, 07:54 PM
Is the P0300 the only code you have?
What do your fuel trims look like?
At this point it would be wise to make a better effort toward determining the cause rather than throw parts at it.
What brand of parts did you use?
Do you have any diagnostic tools such as a fuel pressure tester or a decent scan tool?
The more info you give us, the better we can help. Also, YouTube is your friend.
What do your fuel trims look like?
At this point it would be wise to make a better effort toward determining the cause rather than throw parts at it.
What brand of parts did you use?
Do you have any diagnostic tools such as a fuel pressure tester or a decent scan tool?
The more info you give us, the better we can help. Also, YouTube is your friend.
#4
10-20-2019, 11:09 PM
Originally Posted by GreenBlazer2002
Is the P0300 the only code you have?
What do your fuel trims look like?
At this point it would be wise to make a better effort toward determining the cause rather than throw parts at it.
What brand of parts did you use?
Do you have any diagnostic tools such as a fuel pressure tester or a decent scan tool?
The more info you give us, the better we can help. Also, YouTube is your friend.
What do your fuel trims look like?
At this point it would be wise to make a better effort toward determining the cause rather than throw parts at it.
What brand of parts did you use?
Do you have any diagnostic tools such as a fuel pressure tester or a decent scan tool?
The more info you give us, the better we can help. Also, YouTube is your friend.
#5
10-20-2019, 11:29 PM
As others have said, proper diagnosis not parts swapping is your friend. Your problem can have too many causes to guess accurately.
Do you have any other codes besides P300?
Do you have a misfire counter by cylinder on your scanner. If not, we can hook you up with better scanning capability for good value using a blue tooth dongle and android SW.
Does your scanner show fuel trims (live data)? If so we need short term and long term trims for both banks with polarity at idle and 2500 rpm.
As already suggested, you need to perform the entire fuel pressure test in the sticky.
Have you checked compression?
Don't assume that new parts solved that suspected problem especially if you did not use AC Delco ignition or fuel pump parts.
George
Do you have any other codes besides P300?
Do you have a misfire counter by cylinder on your scanner. If not, we can hook you up with better scanning capability for good value using a blue tooth dongle and android SW.
Does your scanner show fuel trims (live data)? If so we need short term and long term trims for both banks with polarity at idle and 2500 rpm.
As already suggested, you need to perform the entire fuel pressure test in the sticky.
Have you checked compression?
Don't assume that new parts solved that suspected problem especially if you did not use AC Delco ignition or fuel pump parts.
George
#6
10-21-2019, 01:57 AM
Originally Posted by Meangreen92
how can I check my fuel trims? They’re all OEM brands
#7
10-21-2019, 04:32 AM
Originally Posted by GeorgeLG
As others have said, proper diagnosis not parts swapping is your friend. Your problem can have too many causes to guess accurately.
Do you have any other codes besides P300?
Do you have a misfire counter by cylinder on your scanner. If not, we can hook you up with better scanning capability for good value using a blue tooth dongle and android SW.
Does your scanner show fuel trims (live data)? If so we need short term and long term trims for both banks with polarity at idle and 2500 rpm.
As already suggested, you need to perform the entire fuel pressure test in the sticky.
Have you checked compression?
Don't assume that new parts solved that suspected problem especially if you did not use AC Delco ignition or fuel pump parts.
George
Do you have any other codes besides P300?
Do you have a misfire counter by cylinder on your scanner. If not, we can hook you up with better scanning capability for good value using a blue tooth dongle and android SW.
Does your scanner show fuel trims (live data)? If so we need short term and long term trims for both banks with polarity at idle and 2500 rpm.
As already suggested, you need to perform the entire fuel pressure test in the sticky.
Have you checked compression?
Don't assume that new parts solved that suspected problem especially if you did not use AC Delco ignition or fuel pump parts.
George
#8
10-21-2019, 09:38 AM
That’s good on AC Delco parts. The fuel pressure test will confirm the repair and that there are no other fuel system problems such as a bad regulator, injectors, lines or filter. The rest of my previous post will help get us in the right direction to help you. One thing you can do quickly is pull a plug wire at the plug and see if you have 1” of strong blue spark. That will help to determine if the ignition system is ok at idle.
in any event, we need more information to narrow things down. Here is a partial list of things that could be the issue (assuming your repairs are all good):
fuel regulator, injectors, filter
ignition coil, ICM
o2 sensors
cat converter
ect sensor
maf sensor
egr valve
map sensor
TPS sensor
vacuum leaks
air filter
...
George
in any event, we need more information to narrow things down. Here is a partial list of things that could be the issue (assuming your repairs are all good):
fuel regulator, injectors, filter
ignition coil, ICM
o2 sensors
cat converter
ect sensor
maf sensor
egr valve
map sensor
TPS sensor
vacuum leaks
air filter
...
George
#9
10-22-2019, 02:20 AM
Originally Posted by GeorgeLG
That’s good on AC Delco parts. The fuel pressure test will confirm the repair and that there are no other fuel system problems such as a bad regulator, injectors, lines or filter. The rest of my previous post will help get us in the right direction to help you. One thing you can do quickly is pull a plug wire at the plug and see if you have 1” of strong blue spark. That will help to determine if the ignition system is ok at idle.
in any event, we need more information to narrow things down. Here is a partial list of things that could be the issue (assuming your repairs are all good):
fuel regulator, injectors, filter
ignition coil, ICM
o2 sensors
cat converter
ect sensor
maf sensor
egr valve
map sensor
TPS sensor
vacuum leaks
air filter
...
George
in any event, we need more information to narrow things down. Here is a partial list of things that could be the issue (assuming your repairs are all good):
fuel regulator, injectors, filter
ignition coil, ICM
o2 sensors
cat converter
ect sensor
maf sensor
egr valve
map sensor
TPS sensor
vacuum leaks
air filter
...
George
#10
10-23-2019, 08:37 AM
Originally Posted by Meangreen92
yeah that was going to be my next move. Fuel pressure regulator and spider injectors. This is pretty much a project vehicle. As I said, I’m replacing parts as time goes. I’m in no rush to wait
