P2173 runs ruff and then idels to high

Tiny
JAY021703
  • MEMBER
  • 2007 DODGE MIRADA
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 104,000 MILES
Well I have code p2173 also it runs ruff and then stumbles and then raises the idle to 1300 on its own so it runs better. Also with the scanner and watching the fuel trims. The fuel trims are all over the place when its running ruff but most of the time its dumping fuel but once it raises the rpms the fuel trims mellow out. First thing I found was a large vaccum leak from the egr tube seal. I repaired that and smoke checked and no more vaccum leaks. Cleared codes and retried and still same thing. Tried a new throttle body cause I already had one lying around and performed the relearned and cleared ecu and still same problem. Checked map sensor and it is working properly and has the updated version already. Has new Pcv valve also probaley not relivant but I threw that in there anyways. So iam kind of stuck at the moment wonderin what can I try or test or do at this point. Somebody suggested the gas pedal but on the wiring diagram I didnt understand how that could make it run bad. I know on chevys it can but its wiring is set up differently then this car. So please Help! Also has codes po710 and c121c also dont know if thats relivent.
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Friday, April 11th, 2014 AT 8:13 PM

3 Replies

Tiny
HMAC300
  • EXPERT
There is no Mirada in 2007 this was taken off of a dodge magnum
Possible Causes
INTERMITTENT DTC
VACUUM LEAK
MAP SENSOR CIRCUIT (S) OPEN, SHORTED, OR HIGH RESISTANCE
THROTTLE BODY CIRCUIT (S) OPEN, SHORTED, OR HIGH RESISTANCE
MAP SENSOR
THROTTLE BODY
POWERTRAIN CONTROL MODULE (PCM)
Turn the ignition on.
With a scan tool, perform the Throttle Follower Test and monitor the TP Sensor 1 and TP Sensor 2 voltages.
Slowly press the throttle pedal down.
The voltage for TP Sensor 1 should start at approximately 0.3 volts and increase to above 4.7 volts.
The voltage for TP Sensor 2 should start at approximately 4.7 volts and decrease to approximately 0.3 volts.
For 0710 code check for low trans fluid first otherwise it's a network problem.
For the c121cit may be a bad pcm and or abs which your other 2173 may be a bad pcm as well.
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Saturday, April 12th, 2014 AT 6:28 AM
Tiny
JAY021703
  • MEMBER
Sorry it is a magnum and for tps1 its starts off.80 and then travels to about 4.1 and vise versa for the tps 2.
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Saturday, April 12th, 2014 AT 9:32 PM
Tiny
HMAC300
  • EXPERT
If you replaced the throttlebody then it needs to bgo through relearn procedure for testing and make sure there is no binding of it so it should be clean like the throttle plate and iac holes. This may be a pcm but you need to have that checked by apro first. Your numbers don't seem to far off but you also need to check for wires leading to pcm for chafing etc. But the diagram is to big to send over net here. This cold be related to the 710 code you are pulling as well. Also as the egr h ad a vacuum leak is it partially clogged or open it may cause the same thing. Other than that I can be of no further help.
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Sunday, April 13th, 2014 AT 8:12 AM

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