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Truck kind of advances forward at stop light?

Tiny
HIDDEN4321
  • MEMBER
  • 2001 DODGE DAKOTA
  • 3.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
As I'm sitting at a light at times but not always. The truck kind of advances forward a tad. It only happens after about 45 seconds. I've changed the plugs wires, distributor cap, button, and cleaned up the IAC. It never does it in park and I went a day and it never did it all day. But it's back. Not often though.
What should I look at?
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Friday, April 28th, 2023 AT 7:06 PM

17 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
It sounds like the engine has a vacuum leak or you have a dirty throttle body that needs service, here are two guides to help you see how to test/fix it. Use this guide when the engine is cold only:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/throttle-actuator-service

Please go over these guides and report back.
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Saturday, April 29th, 2023 AT 12:49 PM
Tiny
HIDDEN4321
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  • 59 POSTS
Why does it advance forward so hard if air leak?
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Saturday, April 29th, 2023 AT 1:11 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Because the computer system will surge while it is trying to make adjustments. I did notice you said you cleaned up the IAC and did not replace it, I would get a new unit because sometimes they can "glitch" causing the situation you have. Check out the images (below). Please let us know what happens.
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Sunday, April 30th, 2023 AT 10:22 AM
Tiny
HIDDEN4321
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  • 59 POSTS
Is there a method for checking for air leak with spray? I'd like to rule that out a can carbon build up do it in throttle body. Also, can charcoal canister factor it.
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Sunday, April 30th, 2023 AT 10:33 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Yes, this guide will help the title is misleading, use this guide when the engine is cold only:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please go over this guide and report back.
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Monday, May 1st, 2023 AT 9:53 AM
Tiny
HIDDEN4321
  • MEMBER
  • 59 POSTS
I noticed something and wanted to ask. It seems like the level of fuel in tank factors if. I didn't see it happen all day yesterday in traffic off on all day, then later. As fuel level got to a low level where light comes on it started doing that again. I just put half tank of fuel bk in and will see if it does anything. Can that be the fuel pump? I didn't get to check air leaks, but it would have happened yesterday if it was.
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Wednesday, May 3rd, 2023 AT 11:01 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Yes, a weak fuel pump can cause this issue. Here is how to test the pump to confirm this is the issue. You can rent a fuel pressure gauge at the local auto parts store for cheap or free.

This guide can help walk you through the steps:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Regulated Pressure 339 +/- 34 kpa (49.2 +/- 5 psi)

Here is how to change the pump out in case you need it. Check out the images (below). Please let us know what happens.
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Thursday, May 4th, 2023 AT 10:49 AM
Tiny
HIDDEN4321
  • MEMBER
  • 59 POSTS
Turned out to be transmission code p1767. What sensor is it and how would I check circuit?
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Friday, May 5th, 2023 AT 2:27 PM
Tiny
KEN L
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Here is what is said: The P1767 code in a 2001 Dodge Dakota indicates a problem with the transmission's governor pressure solenoid circuit. This code is set when the Powertrain Control Module (PCM) detects that the governor pressure is not within the expected range.

The governor pressure solenoid is responsible for regulating the pressure in the transmission's hydraulic circuit, which controls the shifting of gears. When the solenoid malfunctions or its circuit has a fault, it can cause issues with the transmission's performance, including harsh shifting, slippage, and poor fuel economy.

I would check out the pressure control solenoid. Here is the location. Check out the images (below). Please let us know what happens.
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Saturday, May 6th, 2023 AT 11:21 AM
Tiny
HIDDEN4321
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Yes, I actually put one on it a few years ago as I put a used overdrive in an changed that broken accumulator Spring.
I just cleaned up the wiring harness to it on the outside. Had transmission like fluid and switched out the relay an checked fuses

if it does it again ill pull that gov solenoid.
Not a very common code.I looked in the service manual for techs and it skipped that code!

How do I check circuit on that harness outside the tranny pan.

If it does it again I will pull the pan an check it all out.
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Saturday, May 6th, 2023 AT 12:12 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
You must remove the pan to check the circuit. If the circuit is okay replace the solenoid. Here is a guide and the transmission wiring diagrams so you can test the connections:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Please let us know what happens.
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Sunday, May 7th, 2023 AT 11:02 AM
Tiny
HIDDEN4321
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  • 59 POSTS
Got it, what's the torque for each bolt and the torque screws to gov pressure body?
And to the pan gasket.
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Saturday, May 13th, 2023 AT 10:42 AM
Tiny
HIDDEN4321
  • MEMBER
  • 59 POSTS
Better pic. Should I go ahead with replacing both transducer and gov press solenoid and just switch out the body. Which have both intact already?
Any way to test them when off?
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Saturday, May 13th, 2023 AT 10:43 AM
Tiny
KEN L
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I would test the continuity through the coil. Please let me know if that fixes it.
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Monday, May 15th, 2023 AT 9:29 AM
Tiny
HIDDEN4321
  • MEMBER
  • 59 POSTS
I put another unit w both sensors in it.

How many quarts does the drain pan carry?
Is it 4?
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Monday, May 15th, 2023 AT 9:41 AM
Tiny
KEN L
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Yep, about 4 or 5 let me know if that fixed it.
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Tuesday, May 16th, 2023 AT 12:09 PM
Tiny
HIDDEN4321
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It took 6 quarts. I guess letting it sit a day drained out more.
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Tuesday, May 16th, 2023 AT 12:20 PM

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