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Old 03-12-2010, 12:44 AM   #1
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Question JRSC and backfiring

Quick question....

Those who have the BBK tune, already know how rich it is, especially if you have a CAI....

I was getting on the freeway ramp tonight(driving hard), and I had a HUGE backfire. I instantly got off the throttle once I heard it and now my car is running LEAN.

primary O2 sensor is fine
spark plugs are fine
coil and wires are fine.

car stumbbles at idle, but drives perfect. What do you think could be the cause of the LEAN stituation?

I was going to start looking for a vaccum leak, but I gave up because I was too pissed that this happened. Could the pressure from the backfire cause my JRSC to blow one of it's gaskets since i was under boost?

PS, i throw the DTC code 1131 from it; Lack Of HO2S11 Switch - Sensor Indicates Lean


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Old 03-12-2010, 12:53 AM   #2
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check lines and leaks, those would be my guess, how lean, and what AFR do u usually have
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Old 03-12-2010, 05:24 AM   #3
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primary O2 sensor is fine................... i throw the DTC code 1131 from it; Lack Of HO2S11 Switch - Sensor Indicates Lean
Sounds like the O2 sensor.

Have you datalogged it yet just to be sure?

On the datalog it should oscilate in a fairly even pattern from low voltage (.1v or so) to somewhere around .8v during normal steady state driving.
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Old 03-12-2010, 01:34 PM   #4
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check lines and leaks, those would be my guess, how lean, and what AFR do u usually have
I'll do this today

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Sounds like the O2 sensor.

Have you datalogged it yet just to be sure?

On the datalog it should oscilate in a fairly even pattern from low voltage (.1v or so) to somewhere around .8v during normal steady state driving.
I have a spare o2 snesor, so I'll swapp it out. So the backfire could of damaged it?
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Old 03-12-2010, 05:21 PM   #5
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Well the reason why the back fire was so loud was becasue it was in the intake manifold. It blew the brass fitting for the bypass vavle right out of the lower manifold!!!!



I already replaced the fitting through, and no more LEAN readings.
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Old 03-12-2010, 08:22 PM   #6
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Congrats on such an easy fix!!!
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Old 03-12-2010, 10:07 PM   #7
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Quote:
Originally Posted by blackjack View Post
Well the reason why the back fire was so loud was becasue it was in the intake manifold. It blew the brass fitting for the bypass vavle right out of the lower manifold!!!!



I already replaced the fitting through, and no more LEAN readings.
Most cases that is from very lean not rich , I would do a compression test , I would get a tune on that thing of if you have one check it over good

Tom
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Old 03-12-2010, 10:27 PM   #8
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Congrats on such an easy fix!!!
thanks...

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Most cases that is from very lean not rich , I would do a compression test , I would get a tune on that thing of if you have one check it over good

Tom
I know when I did check the plugs, I was seeing cyc#1 has either a weak spark or blow out.

cyc #2 and #4 had a lot STRONGER spark than #1 and #3, It just might be time for a new coil.
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