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Transmission delay in shifting problem

Tiny
DAYEE4LIFE
  • MEMBER
  • 2001 ISUZU NPR
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
It seems like that there is a delay in shifting from 3-4 and/or 4-5. When I keep on pressing the accelerator pedal then it takes a little long, but if I go a little easy (which is abnormal) then the shifting is fine. Other wise the shifting of the rest of the gears is normal.
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Friday, April 3rd, 2020 AT 7:31 AM

18 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

The harder you accelerate, the longer it will take for the shifts. The RPM's will increase higher before shifting. Is that what is happening? By any chance, is the check engine light staying on when the engine is running?

Joe
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Friday, April 3rd, 2020 AT 11:13 AM
Tiny
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I didn't notice the rpm. There is no check engine light.
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Friday, April 3rd, 2020 AT 5:47 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

Check to see if the RPM's are simply increasing because you are accelerating faster. I have a feeling that is what is happening. I am basing that on the idea that you mentioned it shifts normally if you are easy on the throttle.

Let me know.

Joe
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Friday, April 3rd, 2020 AT 6:14 PM
Tiny
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Okay. Let me check and get back to you.
Thank you Joe.
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Monday, April 6th, 2020 AT 9:26 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

You are very welcome. Let me know what you find or if you have other questions.

Take care and I hope you are well.

Joe
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Monday, April 6th, 2020 AT 9:34 AM
Tiny
DAYEE4LIFE
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  • 11 POSTS
Unfortunately this truck doesn't have a rpm gauge!
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Tuesday, April 7th, 2020 AT 2:57 PM
Tiny
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  • MECHANIC
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Hi,

No problem. Can you hear the engine increasing in speed as the vehicle does the same?

Joe
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Tuesday, April 7th, 2020 AT 6:22 PM
Tiny
DAYEE4LIFE
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  • 11 POSTS
Good morning Joe. I did, but no it doesn't increase in speed!
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Wednesday, April 8th, 2020 AT 6:48 AM
Tiny
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  • MECHANIC
  • 108,192 POSTS
Okay, if the engine RPM's are increasing but the vehicle isn't, it almost sounds like the transmission is slipping.

I need you to check the transmission fluid level to confirm it is clean and full. Here are the directions for doing it.

____________________________________
Engine RPM must be at idle before starting the level check. Keep the transmission fully warmed (valve body ATF temperature: 158-176°F/70-80°C) during the procedure.

1. Park the vehicle on level ground, set the parking brake, block the wheels and start the engine.

2. With the engine idling and regular brakes applied, shift the gear slowly in every range from P to 1 range, and return to the P range.

See pic 1

3. With the engine idling, remove the level gauge and clean off any fluid or foreign material. Insert the level gauge, remove it again, and confirm that the oil level is within the 'HOT' range.

________________________

Let me know.

Joe
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Wednesday, April 8th, 2020 AT 6:13 PM
Tiny
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Okay Joe. Will do.
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Thursday, April 9th, 2020 AT 10:07 AM
Tiny
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  • MECHANIC
  • 108,192 POSTS
Sounds good. Let me know what you find.

Take care,
Joe
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Thursday, April 9th, 2020 AT 4:17 PM
Tiny
DAYEE4LIFE
  • MEMBER
  • 11 POSTS
I checked. It's not in the 'H" range. What oil shall I use?
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Friday, April 10th, 2020 AT 7:25 PM
Tiny
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Hi,

What I am seeing for a 2001 is Dexron III. See attached picture.
Is the fluid clean? (Red in color)
Joe
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Friday, April 10th, 2020 AT 9:01 PM
Tiny
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Hi. Yes the fluid is clean. (Red in color.)
Thank you for your time Joe.
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Friday, April 10th, 2020 AT 9:58 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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You are very welcome. If you have other questions or need anything, let me know.

Take care, stay healthy, and have a Happy Easter!

Joe
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Friday, April 10th, 2020 AT 10:16 PM
Tiny
DAYEE4LIFE
  • MEMBER
  • 11 POSTS
Hi. I added more ATF and the level is correct, but the problem still exists!
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Wednesday, April 15th, 2020 AT 8:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

Is it possible for you to drive the vehicle and record what it is doing so I can hear and see what you are experiencing?

Joe
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Thursday, April 16th, 2020 AT 6:58 PM
Tiny
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Hi. Sure I can Joe.
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Friday, April 17th, 2020 AT 12:00 PM

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