Hhr idle mystery
12-17-2014, 10:32 PM
#14
Deceased
Join Date: 06-30-2010
Location: Kannapolis NC
Posts: 25,739
OK then, the actual OBD II trouble code is a P0172, much more helpful...although the mileage on your HHR is also a tidbit of info that may help narrow down the problem.
But let's look at what a P0172 code means....
It may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty.
(Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry)
* There could be a vacuum leak.
* There could be a fuel pressure or delivery problem.
Now for some possible solutions:
* Inspect all vacuum and PCV hoses, replace if necessary.
* Clean the MAF sensor. Consult your service manual for it's location if you need help, and use MAF Cleaner available at your auto parts store. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling it.
* Inspect fuel lines for cracks, leaks, or pinches.
* Have the fuel pressure at the fuel rail checked by a professional technician, the fuel line pressures found on the Direct Injected LNF engines are dangerous if you aren't 100% certain of your mechanical proficiency.
* Use fuel injector cleaner or get them professionally cleaned/replaced.
* Check for an exhaust leak before the first oxygen sensor, and correct if necessary.
But let's look at what a P0172 code means....
It may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty.
(Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry)
* There could be a vacuum leak.
* There could be a fuel pressure or delivery problem.
Now for some possible solutions:
* Inspect all vacuum and PCV hoses, replace if necessary.
* Clean the MAF sensor. Consult your service manual for it's location if you need help, and use MAF Cleaner available at your auto parts store. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling it.
* Inspect fuel lines for cracks, leaks, or pinches.
* Have the fuel pressure at the fuel rail checked by a professional technician, the fuel line pressures found on the Direct Injected LNF engines are dangerous if you aren't 100% certain of your mechanical proficiency.
* Use fuel injector cleaner or get them professionally cleaned/replaced.
* Check for an exhaust leak before the first oxygen sensor, and correct if necessary.
12-18-2014, 06:27 AM
#16
Banned
Join Date: 10-02-2010
Location: Port Huron, MI
Posts: 5,933
I have a 2008 2.2 5sp. Could have been wildly different if we were trying to diagnose that problem on a Non-Turbo HHR, than for one. SS present a different system with different routing for certain things.
Really is helpful to have Year, Model, Motor Size(Non-SS) and Mileage! Helps determine possible other causes due to age, or potential underlying problems that certain years may have experienced compared to others!
Really is helpful to have Year, Model, Motor Size(Non-SS) and Mileage! Helps determine possible other causes due to age, or potential underlying problems that certain years may have experienced compared to others!
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