99 Suburban p0102, 0103, 0420, 0430
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Joined: Dec 2014
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99 Suburban p0102, 0103, 0420, 0430
Hello all! First post, looking for some thoughts on the state of my Suburban.
99 Suburban 1500, 5.7, 255k miles
Has been throwing the following codes for quite some time:
p0102, p0103, p0420, p0430 - but I never wanted to drop a lot of money on a new cat.
Recently, the truck has stalled a couple of times at red lights and once while making a left hand turn. Each time started back up and drove fine.
Mass airflow sensor is new, upstream O2 sensors are new. Downstream are not.
What do you all think? Shot cat? Shot cat plus something else? I guess that I assume the codes are all related to the same issue, but perhaps they aren't.
Anyway, any thoughts on what's currently up with the truck would be appreciated! Thanks in advance.
99 Suburban 1500, 5.7, 255k miles
Has been throwing the following codes for quite some time:
p0102, p0103, p0420, p0430 - but I never wanted to drop a lot of money on a new cat.
Recently, the truck has stalled a couple of times at red lights and once while making a left hand turn. Each time started back up and drove fine.
Mass airflow sensor is new, upstream O2 sensors are new. Downstream are not.
What do you all think? Shot cat? Shot cat plus something else? I guess that I assume the codes are all related to the same issue, but perhaps they aren't.
Anyway, any thoughts on what's currently up with the truck would be appreciated! Thanks in advance.
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Joined: Apr 2008
Posts: 7,573
Likes: 47
From: Austin, Texas
Welcome to the forum...
clogged catalytic convert(s) are likely to perform okay sitting at a light or at idle and then bog down or stall the engine when you try to accelerate as they cannot accommodate the volume of exhaust that is being sent its way...
my first though would be idle air control valve.... does it do okay with the AC on?
clogged catalytic convert(s) are likely to perform okay sitting at a light or at idle and then bog down or stall the engine when you try to accelerate as they cannot accommodate the volume of exhaust that is being sent its way...
my first though would be idle air control valve.... does it do okay with the AC on?
Thread Starter
CF Beginner
Joined: Dec 2014
Posts: 2
Likes: 0
Welcome to the forum...
clogged catalytic convert(s) are likely to perform okay sitting at a light or at idle and then bog down or stall the engine when you try to accelerate as they cannot accommodate the volume of exhaust that is being sent its way...
my first though would be idle air control valve.... does it do okay with the AC on?
clogged catalytic convert(s) are likely to perform okay sitting at a light or at idle and then bog down or stall the engine when you try to accelerate as they cannot accommodate the volume of exhaust that is being sent its way...
my first though would be idle air control valve.... does it do okay with the AC on?
Might be worth mentioning that since my initial posting, I noticed a fairly serious exhaust leak directly ahead of the muffler.
Administrator
Joined: Apr 2008
Posts: 7,573
Likes: 47
From: Austin, Texas
The reason I ask about the AC, is the IAC or Idle Air Control valve really gets used then, if the vehicle stalls or hunts alot in RPM's with the AC on its a good bet the IAC is the problem
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