High RPM's but car is hesitating to accelerate above eighty KM/H

NOORUDDIN2018

MEMBER
2008 MERCURY MILAN
2.3L
4 CYL
2WD
AUTOMATIC
150,000 MILES

Hello,

I have the car listed above with FNR5 automatic transmission.
The car was excellent at high speeds and acceleration was also excellent since last three years without any maintenance.
I was coming back from long journey of 1,000 KM, I gave the car to another person to drive.
This new guy never drove automatic transmission.
He is driving manual transmission only.
After one hour I had alarm wrench (spanner) warning light and car was not speeding above eighty KM/H and was hesitating too much to go one hundred KM/H.
RPM's are going to 4,000 to 5,000 but car is hesitating to cross even one hundred KM/H.
Previously it was going to one hundred and seventy KM/H easily.

I took the car. But the damage was done.
Battery terminals were disconnected many times and for overnight for hours also.
But once the car is just moving for a minute the wrench (spanner) warning light is coming again.
Checked the fuses. Fuses are okay.
Checked air sensor. Air sensor is okay.

Oil filter changed. Oil changed.
Air filter cleaned up.
Transmission Oil was changed some months ago.

Please guide me what can be the problem.

Thanks.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,724 POSTS

Hi and thanks for using 2CarPros.com.

If the check engine light is coming on, that indicates there will be trouble codes stored in the computer which will help identify the problem. I am not sure where you are located, but if in the US, most parts stores will scan the computer for free. If, however, you cannot access one, here is a video on how to do it. Once you complete this process, let me know what trouble codes were found. That way I will know better which way to direct you.

https://youtu.be/YV3TRZwer8k

I look forward to hearing from you.

Take care,
Joe