Please help diagnose problem
Thread Starter
On The Tree
Joined: Dec 2013
Posts: 107
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From: Alabama
Please help diagnose problem My car has started acting up "BAD". It sounds and feels like it is misfiring when I'm driving at times "it almost sounds like I'm on a 2 step" the AFR goes from 14.2 to 9.5 when it does this. That is at normal highway speeds not WOT. I checked the codes with my buddies reader and have O2 codes but I don't think they would make it act like this. It drives fine 75% of the time. I thought it may be my Timing tuner acting up so I unplugged it and plugged in the bypass plug but it still did it but it didn't seem like it did it as long but that could just be me. I also have a aftermarket mass air meter. Where should I start Mass Air Meter, TPS, IAC, O2's, if one of these how do I check them? Any ideas???
My car has started acting up "BAD". It sounds and feels like it is misfiring when I'm driving at times "it almost sounds like I'm on a 2 step" the AFR goes from 14.2 to 9.5 when it does this. That is at normal highway speeds not WOT. I checked the codes with my buddies reader and have O2 codes but I don't think they would make it act like this. It drives fine 75% of the time. I thought it may be my Timing tuner acting up so I unplugged it and plugged in the bypass plug but it still did it but it didn't seem like it did it as long but that could just be me. I also have a aftermarket mass air meter. Where should I start Mass Air Meter, TPS, IAC, O2's, if one of these how do I check them? Any ideas???
On The Tree
Joined: Jul 2008
Posts: 125
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From: Las Colinas, TX
get a scanner and watch how the O2s are switching. slow or no switching O2s will cause that.
if you have an O2 code, start there.
clean the maf, check plugs and wires and all of that general stuff too.
if you have an O2 code, start there.
clean the maf, check plugs and wires and all of that general stuff too.
The third code/155 is Bank 2 Sensor 1.
Check your O2 wires & connectors first. It's odd that you have coincident troubles on both sides. Maybe reset your codes and monitor for repeats.
Last edited by gMAG; Nov 5, 2014 at 11:14 PM.
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Thread Starter
On The Tree
Joined: Dec 2013
Posts: 107
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From: Alabama
Thanks for the info. We cleared the codes on Saturday and rechecked them today and got the exact same codes.
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On The Tree
Joined: Dec 2013
Posts: 107
Likes: 0
From: Alabama
No direct plug in. As far as the header extensions I'll have to check. Today I switched the O2's around front to rear and rear to front. I will check tomorrow night to see if it throws the same codes or if it throws any.
