General HHR Discuss anything related to the Chevy HHR that doesnt seem to fit into the more specific categories below.

Have the dreaded P0121 code.

Thread Tools
 
Search this Thread
 
Old 01-05-2020 | 09:21 AM
  #11  
donbrew's Avatar
Moderator
 
Joined: 01-23-2009
Posts: 25,345
From: Fredericksburg,VA
This code does not mean what the title says. It means that the ECM is sensing more air flow than it is asking for.

I.E: an air leak between the MAP and the MAF OR a sticky butterfly; that sort if thing.
Old 02-09-2020 | 04:04 PM
  #12  
Jim's 2009's Avatar
Thread Starter
Senior Member
 
Joined: 10-11-2009
Posts: 149
From: PA
Checked and cleaned my throttle body today, it was a little dirty. Checked and tightened one bolt on the throttle body, Hose going to the rubbed intake coupler had a loose clamp. Reset codes but the idle seems a little high. At idle 1000 RPM, 50 mph 2000 RPM. Driving through town I don't have to press the gas petal to go 25 mph at 1500 RPM. Is this normal? Don't seem the same as before. Thanks Jim
Old 02-09-2020 | 04:11 PM
  #13  
donbrew's Avatar
Moderator
 
Joined: 01-23-2009
Posts: 25,345
From: Fredericksburg,VA
Idle is about 700 RPM. Sounds like you didn't disconnect the wires before you cleaned it or the gears in the butterfly got gummed up/stripped.

The loose intake pipe might have caused the code. That is an air leak between the MAF and the O2 sensor.
Old 02-09-2020 | 05:43 PM
  #14  
Oldblue's Avatar
Administrator
 
Joined: 10-13-2011
Posts: 37,841
From: Welland,Ont Canada
Did you move the throttle plate manually? It might just need to relearn the throttle position.

which one bolt on the throttle body a hold down bolt?
Old 02-09-2020 | 07:37 PM
  #15  
Jim's 2009's Avatar
Thread Starter
Senior Member
 
Joined: 10-11-2009
Posts: 149
From: PA
Originally Posted by Oldblue
Did you move the throttle plate manually? It might just need to relearn the throttle position.

which one bolt on the throttle body a hold down bolt?
I did move the throttle plate manually to clean in and around it. The one bolt that was loose was the upper-right bolt that holds down the throttle body.
Old 02-09-2020 | 07:39 PM
  #16  
Jim's 2009's Avatar
Thread Starter
Senior Member
 
Joined: 10-11-2009
Posts: 149
From: PA
Originally Posted by donbrew
Idle is about 700 RPM. Sounds like you didn't disconnect the wires before you cleaned it or the gears in the butterfly got gummed up/stripped.

The loose intake pipe might have caused the code. That is an air leak between the MAF and the O2 sensor.
I did not disconnect the wires on the throttle body. I just unhooked the battery cables. Could I have screwed something up?
Old 02-10-2020 | 07:57 AM
  #17  
Oldblue's Avatar
Administrator
 
Joined: 10-13-2011
Posts: 37,841
From: Welland,Ont Canada
Moving the throttle plate is a big nono. Let it relearn it might clear up.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Optimistic
Problems/Service/Repairs
10
07-05-2024 07:59 AM
Hazeleyes43
2.2L Performance Tech
9
10-25-2016 07:12 PM
paperboy72
SS Specific Service Issues/Repairs
10
06-14-2016 12:46 PM
zeta692000
Problems/Service/Repairs
7
01-03-2014 01:16 AM
dalek
Problems/Service/Repairs
9
11-15-2013 08:34 PM




All times are GMT -5. The time now is 06:36 AM.