As I posted before my 98 jimmy fuel mileage went down to 10 mpg. Auto Zone
checked the codes and found this.
P1133 was told this is low fuel pressure regulator.
P0300 was told this is coil pack failure
P0147 was told this is fuel control shifted lean.
I replaced the O2 sensor behind the cat (bank 1 sensor 3). Took it to AZ and
had the codes deleted. After driving it this weekend the service light is
back on. Mpg went down to 6 mpg. According to AZ my codes are,
Now what? My thinking is take it to a shop.
No code P1034
Possibly a P0134 which is heated oxygen sensor Bank1 Sensor1
insufficient activity (makes sense).
Fuel system lean, Bank1
Diagnose it if you can, or, take it to a shop that can.
This can be as simple as a dead shorted oxygen sensor that only
reads low voltage, the system response would be to richen the
fuel mixture in an attempt to compensate.
It's also possible that half of the injectors are plugged and the
system really -is- lean on that side.
The random miss fire can be from the engine being over fueled, or
under fueled. It could also be because of an ignition problem.
I see nothing in the first set of codes that would warrant
replacing the post-cat oxygen sensor (B1S3).
There is no P1034, so let's assume it's a P0134 - HO2S Bank 1 Sensor 1
insufficient activity. Same as the last sensor, check to make sure it's
working properly, check the wiring as well. Most likely the heater is
busted. :( Fix the P0134 and the P0171, P0300 and P1133 will most likely go
However, what ever is causing the P0300 can cause a P0171 and whatever is
causing the P0171 can cause a P0300 at idle.
Having two HO2Ss failing could possibly mean something else too. Coolant
leak? Or could just be a coincidence. Take 'er to a shop. ;)
Something to consider, since your fuel economy dropped so much something
dumping too much fuel in the system will also cause the O2 inactivity. Also
continued use will destroy the converter in a short amount of time. You need
a scanner to look at the misfires on the individual cylinders for the p0300.
Check out the O2 sensor but don't be too surprised if it isn't the
Sorry Steve. P0430 is the one I'm getting right now. I have an LS1
engine. The code is something like "catalyst operating below
threshold, bank 2." The way I see it, the catalyst on that side of
the engine really is not working all that well, or the oxygen
sensor(s) used to calculate such efficiency are not working correctly.
My question is, what do you guys think it is? Which of the two, or
something COMPLETELY different?
It's a 2001, in a Z28, and fed premium always. My cats are still
covered under warranty. I don't think the O2 sensors are, not that
that has any bearing on what the problem is of course.
On Tue, 28 Mar 2006 12:47:03 GMT, "Steve Mackie"
Took it to the shop. Turned out to be the other sensor. Guess I wasted my
money replacing the one behind the Cat it was the one in front of it. OH
WELL. Cost to diagnose and replace it $190.00.
Next repair will be air conditioner, and that will go to the shop.
It quit working nearly two years ago. I have recharged that didn't work and
the charge is gone. I think it needs a new compressor, and all the other
parts recommended to replace when doing the compressor. I could try it
myself. This is my daughter Jimmy. I have one also and had a shop change out
my AC last year.
So - have you dye tested it for leaks, or put a sniffer on it? I'm no A/C
guru by any stretch of the imagination, but I had a problem with the A/C in
my Silverado last year and it turned out to be the low pressure switch.
Being pretty stupid about A/C, I asked a lot of folks about what the problem
could be only to discover there are a lot of other folks in this world who
are really pretty stupid about A/C. Anyway - I did some basic
troubleshooting and discovered the low pressure switch to be at fault and
replace it. Works like a top ever since. Been dieing for someone to have a
similar A/C problem so I could suggest they look at the low pressure switch.
Oh screw it - look at the low pressure switch Tim.
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