This is why we need to see if the injectors are pulsing...To determine
weather or not to exclude the fuel system for now..If they dont pulse
they we need to find out why..you need to check in your pcm for past
codes they are stored in the history..The codes may not came back
because it wasnt started long enough for the Pcm to detect a problem in
the last ignition cycle.....But will be in the history.....We need them
codes if your scanner cant get them you need to find ne that will.....To
get the history codes will bring us closer to the root of the problem
from when it started.....For some reason I thought you were a mechanic
of some sorts....By the way you came on with the problem and said what
you have already done.
the P0300 may be the only active code but you need to pull a history if
you havent already cleared them by mistake....
Re: 97 Chev Blazer Fuel/Injector Problem? HELP
Group: alt.trucks.chevy Date: Wed, Feb 11, 2004, 7:11am (CST+6) From:
Finally somebody with a answer! I changed the other items out because I
had them to change out any ways and purchased them 2 months ago but
didn't feel overly rushed to put them in just yet. I changed the fuel
pump assembly because the gas gauge hasn't worked for the last 15,000
miles. The truck broke down at my brothers place when he borrowed it
last weekend, so I haven't had but one day to replace the stuff I had
anyways to see if that changed anything. It didn't, so I have all week
to get possible suggestions till I go back. So this next weekend I will
have all my tools to do the easy things, like you said (test light). But
not everything is so cut and dry or everybody would be a mechanic. So
asking to see if anybody has any suggestions after the easy ones don't
work is always a good idea. If it was in your stall at your dealership
you also have all the tools right there, books, schematics, and the
sort. Your also a mechanic apparently so I would hope you should have
some clue otherwise it might be time to find another line of work.
Also what is odd is that all the plugs that I changed were way over
rich, charcoal black. Which if the injectors were starving they would
look lean. But they all looked like they have been running rich. Not
exactly something I would think is the norm for one or two injectors
getting clogged. Why would all six injectors be running rich....
something esle is also going wrong. Unless it goes into some sort of
limp mode or rich mixture mode to get by with the other injectors
running lean or not at all. Which makes me wonder why I don't get a lean
flag on the the 02 sensor, or any other codes. I guess we'll find out
this weekend when I go back to dig into the beast.
isn't that one of the things on the air intake hose? I know there is
another thing for air inlet temperature and the other I think is the
Mass Airflow Sensor....That's a thought....but I would think it would
flag a code.
Doesn't anyone have a Helms Manual in this group? I need the one with
the sensor trouble shooting in it like I have for my old 89 K5. I need
to just buy them, it gives trouble shooting trees and sensor readings
for output using the multimeter or other tools.
You can eliminate the MAF by unplugging it. It will go into limp in mode
and should run. Also check with your scanner to see if it shows correct
RPM while you run it on carb cleaner.
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