g35 coupe loses power after driving approx 20 min
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g35 coupe loses power after driving approx 20 min
05 model. starts and runs amazingly, quick and responsive. then will be sitting at a light and car will shudder and lose 45-50% OF POWER. was told it was a computer and coolant mixing issue but now understanding why computer and coolant would interact
Last edited by kk05; Dec 27, 2017 at 12:46 AM. Reason: more info
BANNED!!!
Joined: May 2017
Posts: 14,837
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From: Washington State
Coupe 6MT Premium RAS
Is it overheating?
Who told you this, Joebob mechanic?
It sounds like you're having a closed loop calculation issue. When the engine is cold it basically runs off a preset algorithm called "open loop", when it's at temperature it then takes all the sensor data into effect (A/F, O2, etc) and changes the fuel/timing maps accordingly. If you have a bad O2 or A/F sensor that's sending the wrong data you will have these kind of issues once the engine is warm but not while it's cold. I recommend getting it scanned with an OBD2 that can read realtime information for all the A/F and O2 sensors and see if something is obviously out of whack. A trip to the dealership for a diagnostic may be in order also.
If the issue only happens intermittently while the vehicle has been up to operating temperature for some time then it sounds like you're going into limp mode which is caused by any number of sensor failures or data exceeding the safe operating limits of the algorithm. Again, if you don't know how to check this yourself with a scanner I strongly recommend a trip to the nearest Nissan/Infiniti dealership for a diagnostic then you can decide how to go about the repairs.
A used motor will cost you $3.5-4.5k for a shop to install. A diagnostic is like $150.
Who told you this, Joebob mechanic?
It sounds like you're having a closed loop calculation issue. When the engine is cold it basically runs off a preset algorithm called "open loop", when it's at temperature it then takes all the sensor data into effect (A/F, O2, etc) and changes the fuel/timing maps accordingly. If you have a bad O2 or A/F sensor that's sending the wrong data you will have these kind of issues once the engine is warm but not while it's cold. I recommend getting it scanned with an OBD2 that can read realtime information for all the A/F and O2 sensors and see if something is obviously out of whack. A trip to the dealership for a diagnostic may be in order also.
If the issue only happens intermittently while the vehicle has been up to operating temperature for some time then it sounds like you're going into limp mode which is caused by any number of sensor failures or data exceeding the safe operating limits of the algorithm. Again, if you don't know how to check this yourself with a scanner I strongly recommend a trip to the nearest Nissan/Infiniti dealership for a diagnostic then you can decide how to go about the repairs.
A used motor will cost you $3.5-4.5k for a shop to install. A diagnostic is like $150.
Registered User
Joined: Apr 2017
Posts: 177
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Is it overheating?
Who told you this, Joebob mechanic?
It sounds like you're having a closed loop calculation issue. When the engine is cold it basically runs off a preset algorithm called "open loop", when it's at temperature it then takes all the sensor data into effect (A/F, O2, etc) and changes the fuel/timing maps accordingly. If you have a bad O2 or A/F sensor that's sending the wrong data you will have these kind of issues once the engine is warm but not while it's cold. I recommend getting it scanned with an OBD2 that can read realtime information for all the A/F and O2 sensors and see if something is obviously out of whack. A trip to the dealership for a diagnostic may be in order also.
If the issue only happens intermittently while the vehicle has been up to operating temperature for some time then it sounds like you're going into limp mode which is caused by any number of sensor failures or data exceeding the safe operating limits of the algorithm. Again, if you don't know how to check this yourself with a scanner I strongly recommend a trip to the nearest Nissan/Infiniti dealership for a diagnostic then you can decide how to go about the repairs.
A used motor will cost you $3.5-4.5k for a shop to install. A diagnostic is like $150.
Who told you this, Joebob mechanic?
It sounds like you're having a closed loop calculation issue. When the engine is cold it basically runs off a preset algorithm called "open loop", when it's at temperature it then takes all the sensor data into effect (A/F, O2, etc) and changes the fuel/timing maps accordingly. If you have a bad O2 or A/F sensor that's sending the wrong data you will have these kind of issues once the engine is warm but not while it's cold. I recommend getting it scanned with an OBD2 that can read realtime information for all the A/F and O2 sensors and see if something is obviously out of whack. A trip to the dealership for a diagnostic may be in order also.
If the issue only happens intermittently while the vehicle has been up to operating temperature for some time then it sounds like you're going into limp mode which is caused by any number of sensor failures or data exceeding the safe operating limits of the algorithm. Again, if you don't know how to check this yourself with a scanner I strongly recommend a trip to the nearest Nissan/Infiniti dealership for a diagnostic then you can decide how to go about the repairs.
A used motor will cost you $3.5-4.5k for a shop to install. A diagnostic is like $150.
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