02 Blazer, misfire problem p0301.. need your help bad, dumped way to much money
#1
02 Blazer, misfire problem p0301.. need your help bad, dumped way to much money
ok so, my blazer has been rapeing my wallet since i bought it.
I've replaced spark plugs, wires, cap, rotor, coil, air filter, fuel filter, asending unit.
I've used SeaFoam.
Fuel Pressure test was normal.
I really don't wanna hear that the injectors are bad, but I think that's the only thing left.
I have a p0301 code(misfire cylinder 1), and I did have a p0401(insufficient EGR flow) but I don't think it's there anymore last I checked.
when I'm driving the check engine light is solid till about 30mph, then anything higher it starts flashing.
I would really just like to hear any other Ideas that aren't the injectors, they're so damn expensive..
Well I appreciate any advice or help, getting 11mpg is killing me. this car is a huge headache
PS. I have a scan tool now if any additional info might help someone.
Edit: my model doesn't have an EGR valve
I've replaced spark plugs, wires, cap, rotor, coil, air filter, fuel filter, asending unit.
I've used SeaFoam.
Fuel Pressure test was normal.
I really don't wanna hear that the injectors are bad, but I think that's the only thing left.
I have a p0301 code(misfire cylinder 1), and I did have a p0401(insufficient EGR flow) but I don't think it's there anymore last I checked.
when I'm driving the check engine light is solid till about 30mph, then anything higher it starts flashing.
I would really just like to hear any other Ideas that aren't the injectors, they're so damn expensive..
Well I appreciate any advice or help, getting 11mpg is killing me. this car is a huge headache
PS. I have a scan tool now if any additional info might help someone.
Edit: my model doesn't have an EGR valve
Last edited by Craig84; 09-08-2012 at 07:20 PM.
#3
Thanks for the advice, but I really don't see that as an issue. any other ideas? could a MAP sensor be a hidden gem in this problem? I took it out to find it gunked up and with a small tear in the gasket. I'll probably steal one from the junk yard tomorrow lol
#5
"but I really don't see that as an issue" Those are your famous last words, I installed a new Champion cap on mine just because it needed a new cap and the new cap made my truck misfire on #1 cylinder, installed AC Delco cap and misfire was gone!
I suggest you stop throwing parts on it and Diagnose the misfire better, First off figure out if it is on the ignition or fuel side this is where a fuel gauge and scanner would come in handy so you can trigger the injector, or a clip on style spark tester so you can watch the spark, it can be time consuming but time is cheaper then new parts
I suggest you stop throwing parts on it and Diagnose the misfire better, First off figure out if it is on the ignition or fuel side this is where a fuel gauge and scanner would come in handy so you can trigger the injector, or a clip on style spark tester so you can watch the spark, it can be time consuming but time is cheaper then new parts
#6
"but I really don't see that as an issue" Those are your famous last words, I installed a new Champion cap on mine just because it needed a new cap and the new cap made my truck misfire on #1 cylinder, installed AC Delco cap and misfire was gone!
I suggest you stop throwing parts on it and Diagnose the misfire better, First off figure out if it is on the ignition or fuel side this is where a fuel gauge and scanner would come in handy so you can trigger the injector, or a clip on style spark tester so you can watch the spark, it can be time consuming but time is cheaper then new parts
I suggest you stop throwing parts on it and Diagnose the misfire better, First off figure out if it is on the ignition or fuel side this is where a fuel gauge and scanner would come in handy so you can trigger the injector, or a clip on style spark tester so you can watch the spark, it can be time consuming but time is cheaper then new parts
#7
"but I really don't see that as an issue" Those are your famous last words, I installed a new Champion cap on mine just because it needed a new cap and the new cap made my truck misfire on #1 cylinder, installed AC Delco cap and misfire was gone!
I suggest you stop throwing parts on it and Diagnose the misfire better, First off figure out if it is on the ignition or fuel side this is where a fuel gauge and scanner would come in handy so you can trigger the injector, or a clip on style spark tester so you can watch the spark, it can be time consuming but time is cheaper then new parts
I suggest you stop throwing parts on it and Diagnose the misfire better, First off figure out if it is on the ignition or fuel side this is where a fuel gauge and scanner would come in handy so you can trigger the injector, or a clip on style spark tester so you can watch the spark, it can be time consuming but time is cheaper then new parts
Cheers to Jase Delco all the way !
#8
Reading this thread might be helpful " 99 4.3 p0300 after overheat rebuild
, I know its long but there is some good tests you could run to narrow down your issue. I had the same issue of the light flashing at around 30 mph . You may not want to pay for the fuel injectors but how much money do you want to spend chasing . just keep testing you will find it .
, I know its long but there is some good tests you could run to narrow down your issue. I had the same issue of the light flashing at around 30 mph . You may not want to pay for the fuel injectors but how much money do you want to spend chasing . just keep testing you will find it .
Last edited by georgew8714; 09-07-2012 at 10:54 PM.
#9
"but I really don't see that as an issue" Those are your famous last words, I installed a new Champion cap on mine just because it needed a new cap and the new cap made my truck misfire on #1 cylinder, installed AC Delco cap and misfire was gone!
I suggest you stop throwing parts on it and Diagnose the misfire better, First off figure out if it is on the ignition or fuel side this is where a fuel gauge and scanner would come in handy so you can trigger the injector, or a clip on style spark tester so you can watch the spark, it can be time consuming but time is cheaper then new parts
I suggest you stop throwing parts on it and Diagnose the misfire better, First off figure out if it is on the ignition or fuel side this is where a fuel gauge and scanner would come in handy so you can trigger the injector, or a clip on style spark tester so you can watch the spark, it can be time consuming but time is cheaper then new parts
#10
I had the same issue and after replacing the Cat and Cleaning the EGR, the problem went away.