Intake & Exhaust Questions and info regarding various aftermatket exhaust systems for the G35 (Headers,Y-Pipes, and Cat-Back Systems)

weird idle and sudden burst of power

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Old Aug 14, 2011 | 09:49 PM
  #1  
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Angry weird idle and sudden burst of power

Quick question

I get a sporadic check engine light for high O2 sescor banks .. I installed fast intension high flow cats, CAI "ztube and stillen cone filter" and plenum spacer and not liking the results!

Weird idle and sudden burst of power.. The car bogs down hard when you get on it...

I got the dealer to reset the MAF sensor and re laern the idle with the consult. Thanks for the help guys!

ERROR CODEs

evaporative immersion p0455
p0132 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor1)
p0152 - O2 Oxygen Sensor Circuit High Voltage (Bank2, Sensor1!
p0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)
 

Last edited by matdaddy; Aug 15, 2011 at 09:32 PM.
Old Aug 16, 2011 | 09:55 AM
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You may have broken sensors or possibly an exhaust leak.
 
Old Aug 20, 2011 | 09:13 AM
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I dont think soo . I dont think i would be getting the engine codes in the exuast.. The tech did change one of the 02 sensors?
 
Old Aug 27, 2011 | 06:38 PM
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v-tec!!!

nah jk but try resetting the ecu
 
Old Aug 28, 2011 | 11:41 AM
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vtech might be a bettter idea! not impressed!

Reset the ECU this morning its funny bc my car was running amazingly like 3days before the light came back! i got this responce from a shop.


"You have a bit of a strange problem. With the codes you're getting, the usual fix is replacing the o2 sensors as 90% of the time when they are out of range (high) it's the o2 sensor that's the problem. In this case you have 3 o2 sensors coming up intermittently which leads me to believe you have a problem that doesn't involve the o2 sensors themselves. I'd be looking at the wiring between the ecu and the o2 sensors including the power and ground circuits related to the o2 sensors or possibly the ECU as a problem. None of the mods you added to your car should have affected the o2 sensors unless a ground wire was left off when doing the plenum spacer or o2 sensor wires got damaged during the exhaust parts install. An outside possibility is the MAF sensor gone bad but it doesn't usually trigger these codes, you would instead see lean or rich codes and sometimes no codes at all. I'm thinking that the poor driveability and the o2 codes are related but i'd also be checking closely for vacuum leaks around the plenum as this is a somewhat common problem when the spacers are installed. I'd be happy to attack this problem for you if you don't mind sending the car down to us. We also have access to dealer scan tools and information if that is required in solving your problem. ThanksMikeWhitehead Performance"
 
Old Sep 3, 2011 | 07:58 AM
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hmmmmmmm
 
Old Sep 3, 2011 | 08:41 AM
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Originally Posted by matdaddy
vtech might be a bettter idea! not impressed!

Reset the ECU this morning its funny bc my car was running amazingly like 3days before the light came back! i got this responce from a shop.


"You have a bit of a strange problem. With the codes you're getting, the usual fix is replacing the o2 sensors as 90% of the time when they are out of range (high) it's the o2 sensor that's the problem. In this case you have 3 o2 sensors coming up intermittently which leads me to believe you have a problem that doesn't involve the o2 sensors themselves. I'd be looking at the wiring between the ecu and the o2 sensors including the power and ground circuits related to the o2 sensors or possibly the ECU as a problem. None of the mods you added to your car should have affected the o2 sensors unless a ground wire was left off when doing the plenum spacer or o2 sensor wires got damaged during the exhaust parts install. An outside possibility is the MAF sensor gone bad but it doesn't usually trigger these codes, you would instead see lean or rich codes and sometimes no codes at all. I'm thinking that the poor driveability and the o2 codes are related but i'd also be checking closely for vacuum leaks around the plenum as this is a somewhat common problem when the spacers are installed. I'd be happy to attack this problem for you if you don't mind sending the car down to us. We also have access to dealer scan tools and information if that is required in solving your problem. ThanksMikeWhitehead Performance"
At least the shop seems to know what they are talking about. That's 1000 more points of information than you would have gotten from your local dealer.
 
Old Sep 5, 2011 | 11:44 AM
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Are you experiencing any ping?
 
Old Nov 12, 2011 | 10:37 AM
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update! Problem solved , Tech installed O2 sensor wrong leaving a voltage leak threw out the sensor bank..
 
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