help!!! P0171 never ending battle
#13
Member
Posts like a V-Tak
Thread Starter
Join Date: Jan 2008
Posts: 39
Likes: 0
Received 0 Likes
on
0 Posts
![tan96ssei is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
sorry for the being the bringer of old topics but i would like to know now that i have cleaned the ground from battery-to-block and power-to-starter/alternator and the power to fuse block
did i miss any of the obvious grounds or power connections posibly one for sensors seeing as how i think this is the ever so common electrical related lean bank
is it worth replacing the IAC, or the MAF i do have a slightly rough idle and when i cleaned the two of them the MAF was fine just dirty and i did the hit test on it and it was fine and the connector test and it instantly threw the code but when i cleaned the IAC it was terribly dirty and when i tried adjusting it... it sperated the plunger from the motor piece but it fight back together again and was very stiff is that normal or not?
i really want to get this issue under control and i cant get it figured out for the life of me i need guidence on this one.
did i miss any of the obvious grounds or power connections posibly one for sensors seeing as how i think this is the ever so common electrical related lean bank
is it worth replacing the IAC, or the MAF i do have a slightly rough idle and when i cleaned the two of them the MAF was fine just dirty and i did the hit test on it and it was fine and the connector test and it instantly threw the code but when i cleaned the IAC it was terribly dirty and when i tried adjusting it... it sperated the plunger from the motor piece but it fight back together again and was very stiff is that normal or not?
i really want to get this issue under control and i cant get it figured out for the life of me i need guidence on this one.
#14
Senior Member
Posts like a Turbo
Join Date: Jan 2008
Location: Memphis, TN
Posts: 281
Likes: 0
Received 0 Likes
on
0 Posts
![93RedSled-SSE is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Jumping in sideways for a minute. On those grounds, you should also have some others at:
One last note; had one member who was running lean and finally found a bad brake booster as the culprit. Yeezch!
I'm back out of here.
One last note; had one member who was running lean and finally found a bad brake booster as the culprit. Yeezch!
I'm back out of here.
#15
Member
Posts like a V-Tak
Join Date: Dec 2003
Location: round lake beach illinois
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
![superman013 is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
i had the same code i checked everything like you. it turned out to be a vacuum leak. i smoked the system all lines were connected but it was coming out the small *-hose on the supercharger.
#16
Member
Posts like a V-Tak
Thread Starter
Join Date: Jan 2008
Posts: 39
Likes: 0
Received 0 Likes
on
0 Posts
![tan96ssei is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
tahnks for the thought redsled i noticed your thread and checked it out but on 96 the batt to motor ground is on the front of the block under the first cylinder and i did not notice any grounds heading towards the ICM
#17
Senior Member
Certified GM nut
Join Date: Oct 2005
Location: Western New York
Posts: 1,942
Likes: 0
Received 0 Likes
on
0 Posts
![Technical Ted is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Didn't the scans help at all?
This problem should fall into one of these three categories.
1- Bad MAF
Did you try unplugging it? Wasn't that one of the steps in the manual?
2- Lack of fuel
Even though the pressure checked good it could be dropping off as the injectors use more fuel. Has the fuel filter been changed? The fuel pressure regulator has a screen that may need cleaning. Have you tried any fuel injector cleaner?
3 - Vacuum leaks
Did you try spraying throttle body cleaner on all the vacuum lines & fittings? Try disconnecting the vacuum line from brake booster & plugging it. If you need to go for a test drive with the booster unplugged then start out very slow & try stopping. It'll take a lot more force on the pedal to stop. Some have had good luck by using cable ties on the vacuum lines. See pic.
This problem should fall into one of these three categories.
1- Bad MAF
Did you try unplugging it? Wasn't that one of the steps in the manual?
2- Lack of fuel
Even though the pressure checked good it could be dropping off as the injectors use more fuel. Has the fuel filter been changed? The fuel pressure regulator has a screen that may need cleaning. Have you tried any fuel injector cleaner?
3 - Vacuum leaks
Did you try spraying throttle body cleaner on all the vacuum lines & fittings? Try disconnecting the vacuum line from brake booster & plugging it. If you need to go for a test drive with the booster unplugged then start out very slow & try stopping. It'll take a lot more force on the pedal to stop. Some have had good luck by using cable ties on the vacuum lines. See pic.
![Name: 95L36TBvacports.jpg
Views: 179
Size: 81.6 KB](https://www.gmforum.com/attachments/1992-1999-91/32713d1501280719-help-p0171-never-ending-battle-95l36tbvacports.jpg)
#18
Senior Member
True Car Nut
Join Date: May 2005
Location: _Phoenix, AZ_ _WCBF '05, '06, '07 Survivor_ ____NEBF '07 Remnant___
Posts: 3,448
Likes: 0
Received 6 Likes
on
6 Posts
![Echo SSEI is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Originally Posted by tan96ssei
tahnks for the thought redsled i noticed your thread and checked it out but on 96 the batt to motor ground is on the front of the block under the first cylinder and i did not notice any grounds heading towards the ICM
#20
Member
Posts like a V-Tak
Thread Starter
Join Date: Jan 2008
Posts: 39
Likes: 0
Received 0 Likes
on
0 Posts
![tan96ssei is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
grounds there and clean i went through the check list and still got a code
im really concerned and not sure why but my mind keeps going back to the fact that my exhaust is high flow all around cat and muffler
![Cry](https://www.gmforum.com/gm/images/smilies/bncry.gif)