High rev at idle after map and maf change
Thread Starter
New Member
Joined: 08-31-2022
Posts: 24
From: Germany
P2187 for an HHR has nothing to do with gas cap, that would trigger EVAP codes. Generic code descriptions are OK, if you take them with a grain of salt.
It means that the A/F ratio is wrong; too much gas or too little air. The computer can only control the amount of fuel. In this case the computer is lowering the amount of gas in the mixture because it is sensing there is too much.
The MOST likely cause is one of the fuel pumps. Second is a sensor, but they should cause their own codes.
Are there any codes NOW, or just odd behavior? If not then probably wrong MAP.
It means that the A/F ratio is wrong; too much gas or too little air. The computer can only control the amount of fuel. In this case the computer is lowering the amount of gas in the mixture because it is sensing there is too much.
The MOST likely cause is one of the fuel pumps. Second is a sensor, but they should cause their own codes.
Are there any codes NOW, or just odd behavior? If not then probably wrong MAP.
no codes after detachment of the battery and installing the sensor just high idling. But I didn’t had the time to drive it yet. I just started it up for a few minutes but it had high revs and first time didn’t start.
Moderator
Joined: 01-23-2009
Posts: 26,533
From: Fredericksburg,VA
Then there may be no problem. I thought you meant you had the codes AFTER the replacements.
Maybe clean the throttle body. Check wires that might have been disturbed. Give the car a few minutes to warm up.
Maybe clean the throttle body. Check wires that might have been disturbed. Give the car a few minutes to warm up.
Senior Member
Joined: 12-05-2014
Posts: 3,368
From: Northern Ohio
Could just be a dirty MAF sensor.
(oops I see now that you already changed the MAF sensor. Maybe it’s defective or there’s a loose wire or bad connector.)
https://www.chevyhhr.net/forums/ss-s...ss-auto-50932/
(oops I see now that you already changed the MAF sensor. Maybe it’s defective or there’s a loose wire or bad connector.)
https://www.chevyhhr.net/forums/ss-s...ss-auto-50932/
Last edited by PulpFriction; Sep 3, 2022 at 10:01 AM.
Moderator
Joined: 01-23-2009
Posts: 26,533
From: Fredericksburg,VA
What I understand:
There were codes
MAF and MAP
Started the engine
high idle
no codes
shutdown immediately.
have not run since then.
Why do we think there is a problem? Maybe it was just relearning the idle.
There were codes
MAF and MAP
Started the engine
high idle
no codes
shutdown immediately.
have not run since then.
Why do we think there is a problem? Maybe it was just relearning the idle.
Thread Starter
New Member
Joined: 08-31-2022
Posts: 24
From: Germany
no no the codes are not there currently but it runs high. Thank you!!
Thread Starter
New Member
Joined: 08-31-2022
Posts: 24
From: Germany
Thread Starter
New Member
Joined: 08-31-2022
Posts: 24
From: Germany