could a bad o2 cause a misfire?

**SteveCZ28** · 07-24-2011, 03:26 PM

Im running into an annoying problem with my z. It starts and drives fineuntil my temp gauge comes up to temp. Then my car will cut out and miss and buck really bad for about a minute or two then snaps out of it and is fine the rest of the time I drive it. I put long tubes on and got rid of the air/egr and rear o2's but have not had them tuned out yet so I have a ses ligh when it starts acting up the ses light will flash for a bit then quit. I tried to get codes read but everything is still screwy with getting rid of the rear o2' thats its hard to see what the actual problem is. Althougj it is showing a random multiple misfire. so I don't know where to actually start. I thought it might be starving for fuel so I changed the fuel filter but it didn't clear up my problem. So I don't know if maybe one of the front o2's in the headers them selves is acting up and can cause this random multiple misfire or nit. Any ideas would be greatly appreciated at this point. Thanks in advance

**cammed goat** · 07-24-2011, 03:30 PM

When you installed the longtubes, did you check your coolant temp sensor to make sure it wasn't damaged? How many codes are you getting?

**SteveCZ28** · 07-24-2011, 03:30 PM

Also I checked all my plug wires. Their all on tight and aren't melted or touching the headers

**SteveCZ28** · 07-24-2011, 03:32 PM

Headers have been on for 6 months now trouble free. Lol it pulled 9 codes the bulk of them being no signal or low input voltage from the o2s

**cammed goat** · 07-24-2011, 03:38 PM

You might need a tune for the lazy readings. The PCM is most likely going crazy with the larger amounts of exhaust gasses going through those headers. When was the last time the MAF was cleaned?

**SteveCZ28** · 07-24-2011, 03:46 PM

But would it take 6 months of normal driving for the pcm to go nuts finally? Maf was cleaned when I did the header install

**cammed goat** · 07-24-2011, 03:52 PM

Depends on driving habits. How often do you put the pedal to the floor?

**SteveCZ28** · 07-24-2011, 03:53 PM

Every once in a while. Maybe once or twice in a 2 week time span

**SteveCZ28** · 07-24-2011, 03:55 PM

Im defiantly not hard on it all the time
Its mainly a cruiser for me back and forth to work but ill get on it with the cutout open just to hear her growl

**cammed goat** · 07-24-2011, 04:09 PM

Based on my experience with my car, I had a PO136 which was insufficient voltage from my driver side pre-cat O2. However, my car didn't stumble, but I had an SES light. I would take the car to a tuner before anything gets worse. Have the codes read, and have the rear O2s tuned out. Do you have any other mods besides the headers?

**SteveCZ28** · 07-24-2011, 05:10 PM

Headers ory and a lid

**cammed goat** · 07-24-2011, 08:32 PM

Definately get that car tuned soon.

**SteveCZ28** · 07-24-2011, 11:23 PM

honestly i think i got a bad tank of gas...i got a bad tank of gas on my bike 2 weeks ago, and it was acting up, sputtering, cutting out and dieing...the camaro is acting the same way. i dumped a can of seafoam in the tank, and it didnt act up at all on the way home from work tonite...so im not exactly sure what is up here. but it just might be a coincidence

**cammed goat** · 07-25-2011, 02:34 PM

Could be. Keep us posted.

**SteveCZ28** · 07-25-2011, 03:15 PM

I drove it today and it didntbhave the slightest hiccup to it. So im thinking strongly on absolute horrible gas

**JayTA98** · 07-25-2011, 03:40 PM

Originally Posted by SteveCZ28

I drove it today and it didntbhave the slightest hiccup to it. So im thinking strongly on absolute horrible gas

replace your fuel filter if you havent in a while.

**SteveCZ28** · 07-25-2011, 03:45 PM

Yea I already did 2 days ago when all these problems started

**JayTA98** · 07-25-2011, 04:00 PM

ah ok. keep us posted.

**cammed goat** · 07-25-2011, 04:10 PM

If you don't experience these symptoms by the next fill up, try another gas station. Just to see if you are correct. It will give you peace of mind. Gas stations can be held liable if there is water in their underground tanks.