Po172

drumking1721 · 05-29-2009, 03:17 PM

I've searched, and I know what it is. I have done everything really to try and fix it. The code just will not go away. I have put a new FPR, MAF,MAP, O2 sensor and seaformd. The car is not misfiring what so ever and i have reset the computer, goes off, but comes back on. I just don't know what to think or do...any ideas?

drumking1721 · 05-29-2009, 07:38 PM

drumking1721 · 06-02-2009, 12:14 PM

anyone?

sbart385 · 06-02-2009, 03:37 PM

Did you check your fuel pressure? This code can also the thrown if you are having fuel pressure or delivery issues. Also check for a possible exhaust leak before the O2 sensor.

If i remember correctly you just replaced a FPR since it was dumping fuel into your TB. Make sure that you dont have your pressure set to low as that will cause a lean mixture.... just something to check for

drumking1721 · 06-02-2009, 05:09 PM

Well heres an update. I went back to a stock FPR. So far i have changed my MAF,MAP, air idle valve and O2. Most of which were due to be changed. But today i was driving and my car started misfiring like crazy and i couldnt go past 35mph,well i could, but it was hard with the hesitation and misfiring. So i went to advanced, and its the same damn code, p0172....talked to my dad and he said its probably and injector gone bad...I have them all out now....Is there anyway to test which one is bad? I really don't have the money to buy a couple. Im so stressed, im at school and without a car...Im hopinh you guys can help me out with this mess :

:

drumking1721 · 06-02-2009, 06:01 PM

Update: just did the resistance check on the injectors, all came out at 12.5 ohms. Which is in the range of 11-14ohms given in the haynes manual...ugh

drumking1721 · 06-02-2009, 07:10 PM

if i ran the injectors out of the car and watch for fuel, would that work?

drumking1721 · 06-02-2009, 07:26 PM

Another thing to add, the car used a 1/4 tank of gas only driving 15 miles....ugh ideas?

drumking1721 · 06-02-2009, 07:44 PM

Sorry all to be a pest...but if i get the trailblazer 28Ibs injectors, i know they are a direct replacement, will these require a tune? I have a DHP, and a set of six of these is a hella of a lot cheaper than stock...

ga2001gt532 · 06-02-2009, 08:56 PM

have you checked your plugs perhaps, i don't know what that code means but if you got a misfire it would have to be your plugs or their is no fuel. my guess is the plugs because your getting bad gas milage or you have a leak on the fuel rail.

drumking1721 · 06-02-2009, 09:04 PM

well i changed the 3 plugs in the back today...bank 1....and thats when i started having issues, like hardcore issues. My uncle seems to think its the wires rather than the injectors....I am gonna pull out the plugs in the morning to check the condition....I really dont mean to be annoying....its just im stuck at school with no vehicle until this is fixed. I mean it could also be a bad coil pack to? i dont know

ga2001gt532 · 06-02-2009, 09:11 PM

it could be the new plugs, i know this motor only likes a couple types of plugs. i would also get new spark wires. when i did just those two things when i bought my car i gained about 50 more miles a tank. manily because their was nothing left of the plugs.

2000 GT Coupe · 06-02-2009, 09:21 PM

it is possible you put the wrong wire on the wrong plug?

ga2001gt532 · 06-02-2009, 09:31 PM

that is the other problem i've seen many people do, i would double check that

drumking1721 · 06-02-2009, 10:01 PM

no, when i first put on the wires i took the car for a drive it didnt do anything. Well i got back,cleaned the air idle valve and then took the car for a drive and it all started......

sugar ray · 06-02-2009, 10:45 PM

hmmmmmmm

I may be experiencing DEJAVU while reading your post. Especially the part about HORRIBLE gas millage and top speed of 65. You have described the SAME symptoms that I went through last summer with my 02 Grand Am. "SAME" exact code Po172 spit out when I hooked my laptop up to my elm-scan tool.

I didn't get as far as replacing sensors though. I wanted to be sure BEFORE throwing money at it. My problem......drum roll..........my Cat. Converter was plugged huge! It was a very COMMON problem with these cars. The converters GM used on these cars were complete CRAPOLA!

My money is on your converter. Climb underneath and give it a nice bang.

After replacing my converter with an aftermarket one life was good! No more code. no more SES light and everything went back to normal.

I do feel for ya! I was there. Checking EVERYTHING. Hvae a look at the Cat. good luck

drumking1721 · 06-03-2009, 10:52 AM

well just replaced the plugs...they were all black...big time....

drumking1721 · 06-03-2009, 11:11 AM

well i just hit the cat...and it worked a little then started acting up again...ugh...the new plugs are solid black from the carbon...something isnt right...

Lab Rat · 06-03-2009, 11:33 AM

When my cat was plugged the car would not even start. And it died on the highway. Luckily for me it was only about 10 blocks from home.
I took an 1/8th inch drill bit and put a hole in my pipe in front of the cat. Started right up. Went to the local muffler shop and had them weld in a new cat. No more problem. Maybe disconnect the down pipe if you don't want to drill the hole. You will be running straight pipe thou until hooked back up. Good luck.

drumking1721 · 06-03-2009, 03:52 PM

I looked at the tail pipes, and they are solid black from all the carbon. This is new. Well i scheduled a diagnostic test for friday in the AM. I really dont know what else. I called the muffler shop that put on my DP and Cat,and they said "their product is not the issue" its my engine... thats bs...idk

05-29-2009, 03:17 PM	#1
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	Po172 I've searched, and I know what it is. I have done everything really to try and fix it. The code just will not go away. I have put a new FPR, MAF,MAP, O2 sensor and seaformd. The car is not misfiring what so ever and i have reset the computer, goes off, but comes back on. I just don't know what to think or do...any ideas? __________________ -Paul

05-29-2009, 07:38 PM	#2
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	bump __________________ -Paul

06-02-2009, 12:14 PM	#3
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	anyone? __________________ -Paul

06-02-2009, 03:37 PM	#4
sbart385 GAGT - Member AKA: Shane Join Date: Apr 2009 Location: Aurora, Co Posts: 66 Vehicle: 1992 Acura Integra GSR	Did you check your fuel pressure? This code can also the thrown if you are having fuel pressure or delivery issues. Also check for a possible exhaust leak before the O2 sensor. If i remember correctly you just replaced a FPR since it was dumping fuel into your TB. Make sure that you dont have your pressure set to low as that will cause a lean mixture.... just something to check for Last edited by sbart385; 06-02-2009 at 03:42 PM.

06-02-2009, 05:09 PM	#5
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	Well heres an update. I went back to a stock FPR. So far i have changed my MAF,MAP, air idle valve and O2. Most of which were due to be changed. But today i was driving and my car started misfiring like crazy and i couldnt go past 35mph,well i could, but it was hard with the hesitation and misfiring. So i went to advanced, and its the same damn code, p0172....talked to my dad and he said its probably and injector gone bad...I have them all out now....Is there anyway to test which one is bad? I really don't have the money to buy a couple. Im so stressed, im at school and without a car...Im hopinh you guys can help me out with this mess :: __________________ -Paul

06-02-2009, 06:01 PM	#6
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	Update: just did the resistance check on the injectors, all came out at 12.5 ohms. Which is in the range of 11-14ohms given in the haynes manual...ugh __________________ -Paul

06-02-2009, 07:10 PM	#7
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	if i ran the injectors out of the car and watch for fuel, would that work? __________________ -Paul

06-02-2009, 07:26 PM	#8
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	Another thing to add, the car used a 1/4 tank of gas only driving 15 miles....ugh ideas? __________________ -Paul

06-02-2009, 07:44 PM	#9
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	Sorry all to be a pest...but if i get the trailblazer 28Ibs injectors, i know they are a direct replacement, will these require a tune? I have a DHP, and a set of six of these is a hella of a lot cheaper than stock... __________________ -Paul

06-02-2009, 08:56 PM	#10
ga2001gt532 GAGT - Member AKA: Corey Join Date: Nov 2008 Location: Mn Posts: 246 Vehicle: 2001 Grand am GT	have you checked your plugs perhaps, i don't know what that code means but if you got a misfire it would have to be your plugs or their is no fuel. my guess is the plugs because your getting bad gas milage or you have a leak on the fuel rail.

06-02-2009, 09:04 PM	#11
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	well i changed the 3 plugs in the back today...bank 1....and thats when i started having issues, like hardcore issues. My uncle seems to think its the wires rather than the injectors....I am gonna pull out the plugs in the morning to check the condition....I really dont mean to be annoying....its just im stuck at school with no vehicle until this is fixed. I mean it could also be a bad coil pack to? i dont know __________________ -Paul

06-02-2009, 09:11 PM	#12
ga2001gt532 GAGT - Member AKA: Corey Join Date: Nov 2008 Location: Mn Posts: 246 Vehicle: 2001 Grand am GT	it could be the new plugs, i know this motor only likes a couple types of plugs. i would also get new spark wires. when i did just those two things when i bought my car i gained about 50 more miles a tank. manily because their was nothing left of the plugs.

06-02-2009, 09:21 PM	#13
2000 GT Coupe Made the move :D AKA: Gene Join Date: Jan 2009 Location: Jax Florida Posts: 1,416 Vehicle: 00 Grand Am GT1 Coupe	it is possible you put the wrong wire on the wrong plug? __________________ 2000 Grand Am GT1 Camaro brake upgrade Goodridge G-Stop SS brake lines MP Racing CAI and tuned PCM LED tails Projector's with HID's Lowered 18" Rims Aftermarket front and rear anti-sway bars

06-02-2009, 09:31 PM	#14
ga2001gt532 GAGT - Member AKA: Corey Join Date: Nov 2008 Location: Mn Posts: 246 Vehicle: 2001 Grand am GT	that is the other problem i've seen many people do, i would double check that

06-02-2009, 10:01 PM	#15
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	no, when i first put on the wires i took the car for a drive it didnt do anything. Well i got back,cleaned the air idle valve and then took the car for a drive and it all started...... __________________ -Paul

06-02-2009, 10:45 PM	#16
sugar ray GAGT - Member AKA: Sean Join Date: Jun 2008 Location: Canada Posts: 229 Vehicle: 2002 Grand Am	hmmmmmmm I may be experiencing DEJAVU while reading your post. Especially the part about HORRIBLE gas millage and top speed of 65. You have described the SAME symptoms that I went through last summer with my 02 Grand Am. "SAME" exact code Po172 spit out when I hooked my laptop up to my elm-scan tool. I didn't get as far as replacing sensors though. I wanted to be sure BEFORE throwing money at it. My problem......drum roll..........my Cat. Converter was plugged huge! It was a very COMMON problem with these cars. The converters GM used on these cars were complete CRAPOLA! My money is on your converter. Climb underneath and give it a nice bang. After replacing my converter with an aftermarket one life was good! No more code. no more SES light and everything went back to normal. I do feel for ya! I was there. Checking EVERYTHING. Hvae a look at the Cat. good luck

06-03-2009, 10:52 AM	#17
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	well just replaced the plugs...they were all black...big time.... __________________ -Paul

06-03-2009, 11:11 AM	#18
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	well i just hit the cat...and it worked a little then started acting up again...ugh...the new plugs are solid black from the carbon...something isnt right... __________________ -Paul

06-03-2009, 11:33 AM	#19
Lab Rat Fear the Four AKA: Craig Join Date: Jul 2005 Location: Kenosha, Wi. Posts: 452 Vehicle: 2000 Grand Am SE	When my cat was plugged the car would not even start. And it died on the highway. Luckily for me it was only about 10 blocks from home. I took an 1/8th inch drill bit and put a hole in my pipe in front of the cat. Started right up. Went to the local muffler shop and had them weld in a new cat. No more problem. Maybe disconnect the down pipe if you don't want to drill the hole. You will be running straight pipe thou until hooked back up. Good luck. __________________ Lab Rat Fear the Four

06-03-2009, 03:52 PM	#20
drumking1721 you want it AKA: Paul Join Date: Mar 2006 Location: Kalamazoo, Michigan Age: 35 Posts: 1,591 Vehicle: 2000 Grand am GT Coupe	I looked at the tail pipes, and they are solid black from all the carbon. This is new. Well i scheduled a diagnostic test for friday in the AM. I really dont know what else. I called the muffler shop that put on my DP and Cat,and they said "their product is not the issue" its my engine... thats bs...idk __________________ -Paul

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