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3.6 lfx power loss

as some of you guys know i did 3.6 lfx on my old FWD GM car swap last year, car weights 1400kg and with my tune had 0-100km/h about 5sec flat at 0 sea level.

i went from 0 sea level to Tehran 1200meters above sea so firstly as usual i felt less power about barometric pressure, then i mentioned trans dont like to downshift like before and accelerate good and when it does ... maybe one gear lower only.

after a few days on my scanner i saw trans fluid temp is between 45~50deg C (120deg F) in compare to 75deg C (167 F) that i had before, then i tried 0-60MPH test and got 6.5sec..i was expected .5 sec slower because of change in elevation but now i m sure it 's not about barometric pressure only.

can low transmission fluid cause ecm to signal less torque from engine? i see 80nm less on my scanner when i compare to same spot and RPM from previous logs.
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low fluid would cause the trans to act weird and shift funny. i know the 6 speed with the 3.6's had a clunky process to check the fluid. like you had to have it at a certain temp to get an accurate ready.

i stole this from Bart77 in another post i will link here:https://www.impalaforums.com/chevy-i...uid-level.html


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If the fluid is just touching the dipstick this is normal it's better to have a bit too little fluid than too much. If the trans is too full, the trans fluid will get aerated by the exhaust fluid from the TCM/solenoid valve assembly and cause slippage and possibly damage.
Here is GM's procedure for checking the fluid level in this trans:


Transmission Fluid Level and Condition Check
This procedure checks both the transmission fluid level, as well as the condition of the fluid itself.

Caution: Use Dexron VI transmission fluid only. Failure to use the proper fluid may result in transmission internal damage.

Note: Ensure the transmission has enough fluid in it to safely start the vehicle without damaging the transmission. With the vehicle off there must be at least enough fluid to wet the end of the dipstick bullet. This will ensure that there is enough fluid in the sump to fill the components once the vehicle is started.

Level Checking Procedure

1. Park the vehicle on a level surface, apply the parking brake and place the shift lever in PARK (P).
2. Start the engine.
3. Depress the brake pedal and move the shift lever through each gear range, pausing for about 3 seconds in each range. Then move the shift lever back to PARK (P).
4. Allow the engine to idle 500–800 rpm for at least 1 minute. Release the brake pedal.
5. Keep the engine running and observe the transmission fluid temperature (TFT) using the Driver Information Center or a scan tool.

Note: If the fluid temperature is below the specified range, perform the following procedure to raise the fluid temperature to the specified range.

6. If the TFT reading is not within the required temperature ranges, allow the vehicle to cool, or operate the vehicle until the appropriate TFT is reached.
Drive the vehicle in second gear until the fluid temperature is within the specified range.

Note: Check the transmission fluid level when the TFT is between 180F and 200F (82C and 93C). The fluid level rises as fluid temperature increases, so it is important to ensure the transmission fluid temperature is within range.

7. Remove the dipstick and wipe it with a clean rag or paper towel.
8. Inspect the fluid color. The fluid should be red or dark brown.
• If the fluid color is very dark or black and has a burnt odor, inspect the fluid for excessive metal particles or other debris. A small amount of “friction” material is a “normal” condition. If large pieces and/or metal particles are noted in the fluid, flush the oil cooler and cooler lines and overhaul the transmission. If there are no signs of transmission internal damage noted, replace the fluid, repair the oil cooler, and flush the cooler lines.

• Fluid that is cloudy or milky or appears to be contaminated with water indicates engine coolant or water contamination. Refer to Engine Coolant/Water in Transmission .

9. Install the dipstick and tighten. Wait three seconds and then remove it again.

Note: Always check the fluid level at least twice. Consistent readings are important to maintaining proper fluid level. If inconsistent readings are noted, inspect the transmission vent assembly to ensure it is clean and unclogged.

10. Check both sides of the dipstick and read the lower level.

Note: It is not necessary to get the fluid level all the way up to the MAX mark. Anywhere within the crosshatch band is acceptable.

11. Install and remove the dipstick again to verify the reading.
12. If the fluid level is not within the crosshatch band, and the transmission temperature is between 180F and 200F (82C and 93C), add or drain fluid as necessary to bring the level into the crosshatch band. If the fluid level is low, add only enough fluid to bring the level into the crosshatch band.

Note: Do not add more than one pint (0.5L) at a time without rechecking the level. Once the oil is on the dipstick bullet, it will not take much more fluid to raise the fluid level into the crosshatch band. Do not overfill. Also, if the fluid level is low, inspect the transmission for leaks. Refer to Fluid Leak Diagnosis .

13. If the fluid level is in the acceptable range, install the dipstick.
14. If the fluid was changed, reset the transmission oil life monitor if applicable.
Fluid Condition Inspection

• Inspect the fluid color. The fluid should be red in color. The fluid may also turn brown form normal use, and does not always indicate contamination.


Note: Fluid that is very dark or black and has a burnt odor usually indicates contamination or overheating.

• If the fluid color is very dark or black and has a burnt odor, inspect the fluid for excessive metal particles or other debris which may indicate transmission damage. Refer to Road Test to verify transmission operation. Change the transmission fluid if no other conditions are found.
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thanks for all helpful info ...


never seen TFT at 80s range since i have this engine and trans, anyway i m not sure if engine output power related to TFT.





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Originally Posted by Joes74challenger View Post
low fluid would cause the trans to act weird and shift funny. i know the 6 speed with the 3.6's had a clunky process to check the fluid. like you had to have it at a certain temp to get an accurate ready.

i stole this from Bart77 in another post i will link here:https://www.impalaforums.com/chevy-i...uid-level.html


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If the fluid is just touching the dipstick this is normal it's better to have a bit too little fluid than too much. If the trans is too full, the trans fluid will get aerated by the exhaust fluid from the TCM/solenoid valve assembly and cause slippage and possibly damage.
Here is GM's procedure for checking the fluid level in this trans:


Transmission Fluid Level and Condition Check
This procedure checks both the transmission fluid level, as well as the condition of the fluid itself.

Caution: Use Dexron VI transmission fluid only. Failure to use the proper fluid may result in transmission internal damage.

Note: Ensure the transmission has enough fluid in it to safely start the vehicle without damaging the transmission. With the vehicle off there must be at least enough fluid to wet the end of the dipstick bullet. This will ensure that there is enough fluid in the sump to fill the components once the vehicle is started.

Level Checking Procedure

1. Park the vehicle on a level surface, apply the parking brake and place the shift lever in PARK (P).
2. Start the engine.
3. Depress the brake pedal and move the shift lever through each gear range, pausing for about 3 seconds in each range. Then move the shift lever back to PARK (P).
4. Allow the engine to idle 500800 rpm for at least 1 minute. Release the brake pedal.
5. Keep the engine running and observe the transmission fluid temperature (TFT) using the Driver Information Center or a scan tool.

Note: If the fluid temperature is below the specified range, perform the following procedure to raise the fluid temperature to the specified range.

6. If the TFT reading is not within the required temperature ranges, allow the vehicle to cool, or operate the vehicle until the appropriate TFT is reached.
Drive the vehicle in second gear until the fluid temperature is within the specified range.

Note: Check the transmission fluid level when the TFT is between 180F and 200F (82C and 93C). The fluid level rises as fluid temperature increases, so it is important to ensure the transmission fluid temperature is within range.

7. Remove the dipstick and wipe it with a clean rag or paper towel.
8. Inspect the fluid color. The fluid should be red or dark brown.
If the fluid color is very dark or black and has a burnt odor, inspect the fluid for excessive metal particles or other debris. A small amount of friction material is a normal condition. If large pieces and/or metal particles are noted in the fluid, flush the oil cooler and cooler lines and overhaul the transmission. If there are no signs of transmission internal damage noted, replace the fluid, repair the oil cooler, and flush the cooler lines.

Fluid that is cloudy or milky or appears to be contaminated with water indicates engine coolant or water contamination. Refer to Engine Coolant/Water in Transmission .

9. Install the dipstick and tighten. Wait three seconds and then remove it again.

Note: Always check the fluid level at least twice. Consistent readings are important to maintaining proper fluid level. If inconsistent readings are noted, inspect the transmission vent assembly to ensure it is clean and unclogged.

10. Check both sides of the dipstick and read the lower level.

Note: It is not necessary to get the fluid level all the way up to the MAX mark. Anywhere within the crosshatch band is acceptable.

11. Install and remove the dipstick again to verify the reading.
12. If the fluid level is not within the crosshatch band, and the transmission temperature is between 180F and 200F (82C and 93C), add or drain fluid as necessary to bring the level into the crosshatch band. If the fluid level is low, add only enough fluid to bring the level into the crosshatch band.

Note: Do not add more than one pint (0.5L) at a time without rechecking the level. Once the oil is on the dipstick bullet, it will not take much more fluid to raise the fluid level into the crosshatch band. Do not overfill. Also, if the fluid level is low, inspect the transmission for leaks. Refer to Fluid Leak Diagnosis .

13. If the fluid level is in the acceptable range, install the dipstick.
14. If the fluid was changed, reset the transmission oil life monitor if applicable.
Fluid Condition Inspection

Inspect the fluid color. The fluid should be red in color. The fluid may also turn brown form normal use, and does not always indicate contamination.


Note: Fluid that is very dark or black and has a burnt odor usually indicates contamination or overheating.

If the fluid color is very dark or black and has a burnt odor, inspect the fluid for excessive metal particles or other debris which may indicate transmission damage. Refer to Road Test to verify transmission operation. Change the transmission fluid if no other conditions are found.
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