Car has been throwing the following 3 codes-

P0300 Random/Multiple Cylinder Misfire Detected
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
p1133

Is there a way to fix these? I'm no car expert so I really have no idea lol
Last..
My boost gauge has been acting up also. It randomly jumps and reads above 20 sometimes. Any idea what's causing the problem? Thanks.

 

I think it would be best to clear them and see if they all come back.

 

The p0113 is a code for the iat which is part of the maf sensor.
Not this code

 

I was looking at the codes again and that last code is actually p1133. Sorry for the confusion but thanks for the help. i'll edit my original post.

 

well the 420 is most likely because of the misfires. the 1133 i think is an o2 sensor code, if your missing then its dumping fuel and the cat thinks its not working and the o2 sensor is not seeing the switching and there for is throwing a code.

how are your plugs? try checking them, maybe you got bad gas?

 

Still haven't gotten around to check the plugs. Is there a possibility that the plugs are gapped wrong?
I usually pump 92 or 91. Is that a safe octane level to run with stage 2 and a 2.9?

 

Here we go
I was sure you had the P0113 up there ,but any how this is what I have.

DTC P1133
Circuit Description
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The powertrain control module (PCM) supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started the PCM operates in open loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperatures and Closed Loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream. Low HO2S voltage indicates a lean exhaust stream.

Do in this order to repair:

Test for shorted terminals and for poor connections at the HO2S 1.

Test for shorted terminals and for poor connections at the powertrain control module (PCM).

Replace the HO2S 1.

Replace the PCM.

 

Thanks for your help!
I guess it's dealer time.
Anyone have any solutions on the boost gauge problem?

 

20PSI or 20 in vacuum?

 

20 psi. Needle goes over to where it says "autometer" and BOOST.
Obviously i'm not boosting that much so something must be wrong with the gauge.

 

There could be a vacuum leak somewhere

 

I just noticed today that it only does that when the AC is turned on. Is this normal?

 

only does what throws a code?, no thats not normal. if it runs like crap with the ac on i'd say somewhat.
if your boost gauge is spikeing to 20psi then no, but the idle will be a bit ruffer.

 

the cel is always on.
the boost gauge acts crazy when the AC is on. the car runs and idles perfectly fine and everything, it's just the boost gauge that goes crazy

 

http://s163.photobucket.com/albums/t...2-18-24-57.flv

Here's a link to the crappy video i got with my cell phone.
Last 5 seconds show what im talking about. I was going 60 mph in the video.

 

bump!
I'm having the boost gauge problem again.
Any one have any idea why it does this?? Video is right up there^^^^