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Engine lack of power

Tiny
MONCHO6685
  • MEMBER
  • 1999 NISSAN PATHFINDER
  • 3.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 185,847 MILES
Hello.

I make repairs to this vehicle:
1. Timing belt with tensioner.
2. Oil pump gasket.
3. Crankshaft seal.
4. Harmonic balancer.
5. Alt/fan pulley with belt.
6. A/c/water pump tensioner with belt.
7. Power steering belt.
8. Thermostat with the housing, radiator flush with mounts and new coolant.

The vehicle start like new, but when you press the gas pedal don't respond it has low power. You see and hear the revolutions in 3,500 but lack of power.
The vehicle have this obdii codes:
1) p0110.
2) p1105.
When I check it doesn't have the IAT sensor (someone eliminate that sensor)
Then I check the p1105 Nissan - manifold absolute pressure/barometric pressure switch solenoid valve and doesn't have voltage (4.3 volts) either on map sensor and the solenoid valve and a vacuum leak on the plenum.
What other possible problem I made have in this vehicle that make the engine lack of power?
If possible I need the fuse boxes identification diagram.
Thanks,
Juan Marin
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Thursday, May 21st, 2020 AT 5:26 PM

16 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

The IAT is located at the front bumper. Did you check there? See pic 1

As far as the fuses, I need the last 8 digits of the VIN number. Also, you indicated a vacuum leak at the intake. Is that the vacuum supply to the MAP sensor? Have you checked the catalytic converter for damage or restriction? When it is at 3500 RPM's, what happens? could it be the transmission slipping?

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Keep in mind, if sensors have been removed, it becomes a guessing game as to what all was done, why it was done, and how they were bypassed.

Let me know.

Joe
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Thursday, May 21st, 2020 AT 8:06 PM
Tiny
MONCHO6685
  • MEMBER
  • 118 POSTS
Hello Jacobandnickolas,

Yes, I locate where the IAT sensor suppose to be, but someone eliminate that part totally with the resonator too.
The VIN for this vehicle: Jn8ar07sx xw374550.
The MAP sensor was disconected too.
I'm looking if the vacuum leak I hear is from the MAP sensor or from other vacuum line under the plenum.
I look and test the catalytic converter with the information you supply to me, but they are work properly.
What I try to explain when I told you about the rpm's is that when you press the accelerator pedal the rpm's go high and you hear the effort of the engine, but you sense the lack of power, it doesn't respond or accelerate and the transmission slipping. I need to depress the accelerator pedal slow to make the transmission engage to overdrive.
I need (if possible) the wiring diagrams for the IAT sensor, MAP sensor to make the proper connection circuit.
I ask you 2 more things, the distributor and or the TPS sensor in this pathfinder can cause the symptoms (problem) that I explain.
Here I send to you a video from my scanner taking live data from the rpm's, throttle position sensor and the timing (grades) of cylinder #1.
Other observations are welcome.
Thanks for the help,
Juan Marin.
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Sunday, May 24th, 2020 AT 10:54 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

The engine sounds good in the video. Are you sure the lack of power isn't simply the result of a slipping transmission?

As far as the wiring schematics, I attached all of them for the power-train management. There were three pages of schematics. I cut them in half to make them readable, but I did overlap them to help you follow them easier. They include the distributor, IAT, and so on.

Let me know if this helps.

Joe
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Sunday, May 24th, 2020 AT 7:34 PM
Tiny
MONCHO6685
  • MEMBER
  • 118 POSTS
Hello Joe.

Thanks for the diagrams.
Let put this sensors where they suppose to be.
I think I had a bad ECM or a bad TPS.
I'm going for the TPS first and I let you know.
I'm sending you a video and see the changes on the readings on the TPD vs the rpm's.
Thanks,
Juan Marin
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Monday, May 25th, 2020 AT 7:00 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Juan,

I see the RPM's increase but the speed doesn't. Are you certain the transmission isn't slipping that bad?

Joe
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Monday, May 25th, 2020 AT 8:53 PM
Tiny
MONCHO6685
  • MEMBER
  • 118 POSTS
Joe,

what about the readings of the TPS? The voltage signal change as you see on the video.
Maybe a bad TSS? Or you think is time to repair/change the transmission?
A bad torque converter?
Bad solenoid? What other test I can make to the transmission to be sure is damage?
Thanks,
Juan Marin
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Tuesday, May 26th, 2020 AT 5:53 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Juan,

If I am correct and it is the transmission slipping, I would remove the trans pan and check for evidence of excessive dirt, metal shavings and so on. When you check the transmission fluid, what condition is it in? Is it still red or is it dark in color and have a burnt smell?

Are you referring to the torque converter clutch (TCC) above?

Joe
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Tuesday, May 26th, 2020 AT 10:49 AM
Tiny
MONCHO6685
  • MEMBER
  • 118 POSTS
Yes Joe, the torque converter clutch.

I'm going to drain the transmission fluid pan take it out and check for what you suggest to me. Maybe the shifting solenoids are clog. I can test them putting 12v directly and if they make a click there are okay or there's another way to test them?
The ones on the image, right?
I let you know what I found.
Thanks,
Juan Marin
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Tuesday, May 26th, 2020 AT 4:35 PM
Tiny
MONCHO6685
  • MEMBER
  • 118 POSTS
Joe, I really appreciate your help.
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Tuesday, May 26th, 2020 AT 4:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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You are very welcome. You know, I have even had a vehicle years ago where the transmission filter was plugging after it ran a few minutes causing first a slipping and then nothing at all. Lets hope it's something simple.

Let me know what you find.

Take care,
Joe
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Tuesday, May 26th, 2020 AT 9:43 PM
Tiny
MONCHO6685
  • MEMBER
  • 118 POSTS
Hello Joe,

I didn't find any visible damage on the transmission, no excessive dirt, no metal shavings, the filter is in good condition, it's smell normal (no burnt smell), the color of the fluid is okay. I send you photos.
Let's continue discarding things. Shifting solenoids (overrun clutch, EPC, SSA shift and SSB shift), throttle position sensor, torque converter clutch solenoid, speed sensor.
What can be the next step?
Thanks,
Juan Marin
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Wednesday, May 27th, 2020 AT 10:10 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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The next thing I would check is line pressure. Here are the directions for that procedure. The attached pics correlate with the directions.

______________________________________

1999 Nissan-Datsun Truck Pathfinder LE 2WD V6-3.3L (VG33E)
Line Pressure Test
Vehicle Transmission and Drivetrain Automatic Transmission/Transaxle Testing and Inspection Component Tests and General Diagnostics From VIN # 350001 Basic Inspections Line Pressure Test
LINE PRESSURE TEST
LINE PRESSURE TEST PORTS

pic 1

- Location of line pressure test ports.
- Always replace line pressure plugs as they are self-sealing bolts.

LINE PRESSURE TEST PROCEDURE
1. Check A/T fluid and engine oil levels. If necessary, add fluid and oil.

Pic 2

2. Drive vehicle for approx. 10 minutes or until fluid and oil reach operating temperature.
ATF operating temperature: 50 - 80°C (122 - 176°F)

pic 3

pic 4

3. Install pressure gauge to corresponding line pressure port.

Pic 5

4. Set parking brake and block wheels.
- Continue to depress brake pedal fully while line pressure test is being performed at stall speed.

Pic 6

5. Start engine and measure line pressure at idle and stall speed.
- When measuring line pressure at stall speed, follow the stall test procedure.
Line pressure: Refer to Specifications.

Pic 7

JUDGEMENT OF PRESSURE TEST
___________________

Let me know.
Joe
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Wednesday, May 27th, 2020 AT 9:01 PM
Tiny
MONCHO6685
  • MEMBER
  • 118 POSTS
Okay Joe, let's do it.
I let you know the results.
Thanks,
Juan Marin
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Thursday, May 28th, 2020 AT 7:20 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Sounds like a plan. Based on the video you provided, I feel the transmission is slipping. I wish I was there. It would make things much easier for me. LOL

Take care,
Joe
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Thursday, May 28th, 2020 AT 8:41 PM
Tiny
MONCHO6685
  • MEMBER
  • 118 POSTS
Hello Joe.

About the results for my vehicle I solved the problem with a brand new throttle position sensor, calibrated and like new.
Thank you very much for the all your help and for all of the information.

Thanks,
Juan Marin
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Wednesday, June 17th, 2020 AT 8:21 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Wow, I wasn't thinking in that direction. It sounded transmission related. That is one of the problems not having the vehicle in front of me. LOL Regardless, I'm glad it's running good for you. Please feel free to come back anytime in the future if you need something.

Take care,
Joe
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Wednesday, June 17th, 2020 AT 7:27 PM

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