Hey guys,I searched and only found one thread with the same code listed and it didnt have a solution lissted :\.

I was coming to work today, freeway driving about 75 and my engine light comes on and my car just goes dead. no power. i think it actually slowed down when i pushed the gas in more. so i take it out of gear and its idling at 2000-2500 rpm and wont rev past 3000. I got a engine code IIRC p2173, i'll check again and update it if thats wrong. but it was overload oxygen flow.

thats weird though because I have the AEM CAI and have been running it for almost 2 years, and even had a cheapo ebay one for 2 years before that that threw a code but never rendered my car unusable.

i turned it off and let it sit for a few minutes and then started it back ip and it ran fine the rest of the way to work, but the engine light stayed on. this sounds a lot like a post a read a while ago, but the guy before was running boosted so i didnt figure it would be the same issue.


edit: fault code p2173. corrected above.

and when i search it says "Throttle Actuator Control System - High Airflow Detected"

 

visualy inspect the throttle body... if i remember correctly i have a customer with similar issue, a fuel saver get stuck in the throttle plate and then set this fault code... look for filter debris

 

inspect throttle plate, as well as the electrical connector...

also inspect your MAF...

 

i checked the maf and the throttle body and all the wiring connections and nothing so far.

the check engine light went away and it ran good for a day then i went to start it yesterday morning and it ran... chunky. lol but it idle good but if i i gave any throttle at all it would sputter and stall out. the engine light came back on and it gave me i believe it was p0300, but the description was "random/multiple cylinder misfires."

After reading some other errors around on here i disconnected the battery and unplugged the front ecu and the ecm in the glovebox and let it sit for a few minutes and reattached everything and it ran great until it relearned the idle. then the engine light came back on with p0300 misfire code. It idles smooth but again throttle applied and it runs rough. not as bad as it was before, but noticeably chugging every once in a while.

i'm completely baffled. I checdked all the spark plugs and they're good. wires as well.

 

check fuel pressure

 

the fuel pressure will set codes like "system too lean" ... i will look in the shop book for the p2173 tomorrow for you,

 

yeah true...the p2173 is still MAF/throttle actuator related, you should make sure they are working electrically, it might not be as simple as a visual inspection...

 

Well it's a faulty MAF that puts a car in limp mode, can't rev it high but can slowly nurse it home. Geez guys, throw away those oiled filters and go with dry cone or back to stock air filter element. Full-time mechanics will tell you they see this regularly (or maybe they won't tell you if they get to sell lots of new MAFs, which you can't blame them for).

 

i have a dry cone :x but i also have the dry bag? i cant remember what its called, but its the water resistant sleeve that fits over the filter. i'll take that off and clean the MAF sensor tomorrow and see what happens.

How would i check the fuel pressure. I have the bluetooth OBD elm327 but when i choose the fule pressure gauge it doesnt display anything.


here's what i got form the manual though-

from the p0300 random multiple misfire code check systems:

Camshaft position sensor
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor

and from the p2173 error :
• Mass airflow sensor failed.
• Throttle valve faulty operation.
• Throttle position sensor failed.
• ECM failed. <M/T>
• PCM failed. <A/T>

so in theory, if i cross the two together then i can figure which system(s) have failed

which would mean that it should be either MAF sensor or throttle position sensor.

I'm going to my buddy's shop tomorrow, hopefully he can give me a little insight into it.

 

ignore that comment about fuel pressure, i was thinking bad injector for misfire, but a 2173 is likely going to be the MAF...and if it's not the MAF, it's the throttle body, case closed...

 

Well, I broke the MAF sensor when cleaning it so I guess I'll be replacing it anyway lol. Now well see if I need to replace the throttle body also. :x

 

lol, good stuff...someone was selling one, i thought it was parrish, but i could be wrong...good luck...

 

90 bucks for the MAF sensor but it was the problem. so far so good. no light. smooth idle. smooth acceleration. back to normal*

*i did notice a slight ticking while idling, but i think i am just imagining things from when i was looking for things to fix lol

 

injectors tick...normal

valve tick, a bit louder...not normal, but not that bad unless it's really slapping...if you can hear it above the engine while accelerating, you need to adjust your lash...

 

i cant hear it from inside the car, but when the hoods open i can hear it when i rev it. :X lol im probably just overreacting .