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Old 08-15-2016, 04:13 PM   #1
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Default 03' Grand Am GT MAF Issues

Car is an 03 GT with the 3400, it was throwing an intermediate p0101 code so I changed the maf also threw in a new air filter. now I have p0101 and p0102, when i drive it around town I can't get the lights to come back after I reset them and the car drives perfect. However she drove the car maybe 20 miles a little more and she explains that it dies when slowing down, either backfire or misses and smells like rotten eggs. Getting about 23 mpgs. I inspected the ground and for the MAF circuit and it visually looked fine. I'm curious if I might be dealing with a clogged cat. Thoughts?? Thanks
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Old 08-15-2016, 04:17 PM   #2
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did you make sure it was plugged in............
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Old 08-15-2016, 04:17 PM   #3
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bad crank position sensor?
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Old 08-15-2016, 04:20 PM   #4
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No p1xxx codes?
P0xxx codes suck for over the web diagnostics
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Old 08-15-2016, 04:20 PM   #5
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yeah it's plugged in.
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Old 08-15-2016, 04:21 PM   #6
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No p1xxx codes?
P0xxx codes suck for over the web diagnostics
nope just the 2. I'll be home around 6:30 and will dive into it more. Just trying to get an idea of where to start checking from here
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Old 08-15-2016, 04:26 PM   #7
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also mind you, I do not have a visible CEL, I found the codes by checking the codes on the handheld
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Old 08-15-2016, 04:36 PM   #8
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P0102 – Mass air flow (MAF) sensor/volume air flow (VAF) sensor low input – OBD Trouble Codes

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General Motors – Some vehicles, with a heavily contaminated catalytic converter, may set this DTC. Do an engine vacuum test
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Old 08-15-2016, 06:48 PM   #9
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the upstream O2 is easy to remove, then test drive with it unplugged and see if power picks up. the vac test is checking idle vac and part throttle load. if manifold vac drops to near zero at less than 100% throttle/100% load then exhaust is restricted
if its over 120k then its even more likely its plugged or nearly plugged
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Old 08-15-2016, 08:06 PM   #10
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the upstream O2 is easy to remove, then test drive with it unplugged and see if power picks up. the vac test is checking idle vac and part throttle load. if manifold vac drops to near zero at less than 100% throttle/100% load then exhaust is restricted
if its over 120k then its even more likely its plugged or nearly plugged
It stayed at 20hg at idle and at 2500rpm
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Old 08-15-2016, 08:08 PM   #11
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Car is currently throwing an intermittent p0101
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Old 08-15-2016, 08:39 PM   #12
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under load or just high idle in p/n, you need to be loaded, tape gauge to windshield while driving

a broken cat is more likely to cause an intermittent restriction, smack the converter with a mallet /gloved palm and listen for a rattle
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Old 08-15-2016, 09:12 PM   #13
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Okay, I was in park during the test, I'll get at it tomorrow, thank you for the insight. I feel like this is what the issue is. Just odd I'm not throwing a code at the 02 or iirc there should be a failed cat code as well
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Old 08-15-2016, 09:23 PM   #14
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On board diagnostics aren't that good
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Old 08-15-2016, 09:52 PM   #15
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Whats the mileage? The cat always seem to go bad around 120k
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Old 08-16-2016, 06:03 AM   #16
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ironically enough 117k
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Old 08-16-2016, 08:41 AM   #17
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Yea I bet it is a bad cat. I've seen several plugged cat cars with the same symptoms all around that mileage.
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Old 08-26-2016, 11:33 PM   #18
 
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i got an 01 ga gt with almost 160k miles and havent had that issue yet
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Old 08-29-2016, 07:16 PM   #19
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Ended up being a bum maf. Nice this ride is the tits
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Old 09-20-2016, 04:46 PM   #20
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The tits of this ride lasted about a week or two, although the dying was more intermittent it was still happening, swapped the maf again tested for plugged cat, inspected wiring and grounds, only notable find was a dry rotted pinched vac hose for the evap purge. Today was it's worst dying at every stop so I limped to Chevy and they diagnosed ecu. Bleh
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Old 09-26-2016, 08:40 PM   #21
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Ecu swapped and it was bum, threw oe back in and car ran without codes. No explanation. Drove it home died again about 30 min away from shop. Faauuuccck
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Old 09-29-2016, 12:29 PM   #22
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Now shop is thinking the torque converter is slipping or something. Idk some gm bulliten this car needs to burn
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