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
cleric670
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Dec 16, 2024
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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.
Registered User
Quote:
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.
Agreed, could be an 02 sensor issue, would definitely recommend an OBD2 scanner if you don't already own one. $15 bucks online, scan as many times and as many different cars as you need to.Originally Posted by cleric670@gmail
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.
Registered User
This get resolved? I had a similar issue except it would lose all power after it started losing power. Traced to a bad alternator draining the system and not charging correctly.