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post #1 of 82 Old January 14th, 2013, 06:58 PM Thread Starter
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Back firing

My car is back firing a lot. I have no idea why. We changed the o2 sensor finally, tried new tunes (stock, street and racing bama tunes), cleaned the iac valve and idk what else to do

Any ideas?


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post #2 of 82 Old January 14th, 2013, 07:01 PM
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What is your A/F ratio doing? Also, check all your exhaust connections.

Check this page out: http://en.wikipedia.org/wiki/Back-fire


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post #3 of 82 Old January 14th, 2013, 07:04 PM Thread Starter
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How do you check the af ratio?


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post #4 of 82 Old January 14th, 2013, 07:08 PM
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Are you throwing any codes? If not, tighten up everything in your exhaust system. I had a camaro that would backfire occasionally. Turned out I had a hole in the muffler (exhaust leak).


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post #5 of 82 Old January 14th, 2013, 07:10 PM Thread Starter
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I was for my o2 sensor. But that's it.


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post #6 of 82 Old January 14th, 2013, 07:11 PM Thread Starter
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Lol would a loose COP make it back fire?


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post #7 of 82 Old January 14th, 2013, 07:14 PM
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If you aren't throwing a code and you cleared the DTC, it has to be an exhaust leak somewhere. That would be my guess but maybe someone else will jump in.


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post #8 of 82 Old January 14th, 2013, 07:19 PM Thread Starter
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We checked the flanges, no leak and no codes


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post #9 of 82 Old January 14th, 2013, 07:33 PM
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Exhaust leak, bad valve(s), leaking injector(s), bad TPS...

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post #10 of 82 Old January 14th, 2013, 07:35 PM Thread Starter
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How can I check those things?


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post #11 of 82 Old January 14th, 2013, 08:08 PM
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Exhaust doesn't leak, we checked that....COPs are all in correctly, and tight.


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post #12 of 82 Old January 14th, 2013, 08:10 PM
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The surging idle issue seems to be fixed, he reloaded the stock tune, which made it worse, then uploaded the BAMA tune, and it idles better.


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post #13 of 82 Old January 14th, 2013, 09:29 PM
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Anyone?


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post #14 of 82 Old January 14th, 2013, 09:39 PM
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Now it's giving 2 codes, TPS sensor A low, and o2 bank 2 sensor 1.

Which o2 is bank 2 sensor 1?
And what is the TPS sensor A low?


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post #15 of 82 Old January 14th, 2013, 09:45 PM
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Back firing-imageuploadedbyautoguide1358214277.957111.jpg
Back firing-imageuploadedbyautoguide1358214308.807730.jpg


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post #16 of 82 Old January 14th, 2013, 09:52 PM
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Quote:
Originally Posted by MustangLouver View Post
Now it's giving 2 codes, TPS sensor A low, and o2 bank 2 sensor 1.

Which o2 is bank 2 sensor 1?
And what is the TPS sensor A low?


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Passenger upstream O2 sensor.


"Backfire" can mean a couple things. Is it misfiring and running like hell?

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post #17 of 82 Old January 14th, 2013, 09:59 PM
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Well, is was overall running like ass. Now it idles okay, sputters while driving under acceleration, and backfires.

Could that o2 sensor be causing all the problems?


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post #18 of 82 Old January 14th, 2013, 10:09 PM
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Here is what the shop manual says about P0122, and P0155. P0155 has the same possible causes as P0135.

What they have in common is a low voltage condition, one a low Vref (reference voltage) from the PCM. The other a low Vpwr (system [battery] power) level. This could be a wiring problem, or just low battery output.

Check the battery terminals to make sure they are clean and solidly connected, also check the voltage at the battery posts (the posts, not the terminals). It should be 12.6 V with the battery fully charged and stabilized (5 to 10 minutes after shutting down the engine)--if it is not then the battery is not charging properly.

If the battery post voltage is OK then check the voltage between the battery terminals, it should be close to the battery voltage not more than 0.1 V less. If it is less than that check the connections.

Next check the voltage between the positive battery terminal and the engine block. It too should be within 0.1 V of the battery voltage--if not there is a bad ground connection between the battery negative (ground terminal) and the block.

Monitor the battery voltage while cranking the engine, it should not drop below 10.5 V--if it does the battery has a bad cell, you will need a new battery or the battery is not fully charged. You can find the complete charging system description and diagnostic tests by going to my website and making these menu selections:


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PP 70mm TB & plenum, Ralco RZ_flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

new ride - 1998 SL500, 5.0L 32V 326/347 HP/tq
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post #19 of 82 Old January 14th, 2013, 10:12 PM
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Quote:
Originally Posted by Buddha View Post
Passenger upstream O2 sensor.


"Backfire" can mean a couple things. Is it misfiring and running like hell?
P0155 is for O² sensor 21, driver's side upstream sensor...


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SOLD! - 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat,
PP 70mm TB & plenum, Ralco RZ_flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

new ride - 1998 SL500, 5.0L 32V 326/347 HP/tq
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post #20 of 82 Old January 14th, 2013, 10:13 PM
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bank 2 is drivers side(bank 1 is where #1 cyl is) and it is the first one

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