Passat engine pulsing

[Benjamin]

Re: Passat engine pulsing

Ben can probably replace the slushbox in 3 hours with his eyes closed. He's done it several times the past year of two lol.

Maybe with a lift and 3 extra hands...

Take 2.5 - 3 hours without a lift, 2 hours for removal with. Putting in back in takes a little longer due to getting the two together and aligning the sub frame.

Going to be doing it again soon as I should have a used trans that will actually work going in.

[100%VAGitarian]

Re: Passat engine pulsing

maybe in gear the idle is a little too low and the ecu is trying to compensate for it but then it starts hunting for the right value and causes your pulse.

just an idea to maybe take your mind off a bad transmission.

[stefan]

Re: Passat engine pulsing

maybe in gear the idle is a little too low and the ecu is trying to compensate for it but then it starts hunting for the right value and causes your pulse.

just an idea to maybe take your mind off a bad transmission.

Yes, I was giving this some thought. The neutral idle is a bit over 900 (have to check exact but needle looks like about 910). I think that is pretty normal. In gear, the trans naturally drags it down a little then it quickly levels out (when everything is working properly). So something could be pulling it down, and ECU trying to compensate, causing the hunting, but after everything I've checked, I am sort of thinking that something may be the transmission.

[witchcraftz]

Re: Passat engine pulsing

Possible:

with Vagcom

Special adaptations: Login code 12233:

These procedures do NOT apply to the PD engines, which use a completely different type of EGR system and for which there is no known modification. !

To perform the following adaptations (except idle) you need to use the Login function.
Enter 12233 as a Login code.
Misuse of some of the adaptations can lead to engine failure.
This is done at your own risk!
Note that the EGR setting is for off-road use only...
[Select]
[01 - Engine]
[Login - 11]
Enter 12233 to activate special adaptations,
[Do It!]

[Adaptation - 10]
Enter the "channel number" below to select each channel.
Put in the suggested value(s) in "new value".

[Test]
Observe the "test value" field to make sure the adaptation setting is acceptable.
[Save]


Channel 1: injected quantity

Check the injected quantity at idle, engine warm and all power consuming devices turned off.
Specification is 2.5 to 9 mg/h.
To change the amount of injected fuel perceived by the ECU, go to adaptation channel 1.
If you have driveability problems, you may want to increase it to 3-4 mg/h.
For slightly improved throttle response, you may try to decrease the value.

Channel 2: idle speed

No login required
The stock adaptation value should be 32768 (corresponds to 903 rpm).
Increase or decrease this to change idle speed.


http://www.ross-tech.com/vag-com/cars/tdi.html

[stefan]

Re: Passat engine pulsing

Possible:

These procedures do NOT apply to the PD engines, which use a completely different type of EGR system and for which there is no known modification. !

Have played with this on my previous car, but this one IS a PD.

[stefan]

Re: Passat engine pulsing

New Symptoms:

So on the weekend I was noticing that if (while stopped), I put some stress on the PS pump, the idle changes. Also, if I put just enough stress on the steering wheel to load up the PS pump, but not quite enough to turn the wheels, the steering wheel actually jerks around a little bit as the engine pulses. Do you think my PS pump could be the issue here?

[Benjamin]

Re: Passat engine pulsing

Ever done the alt pulley?

[Benjamin]

Re: Passat engine pulsing

This is why

http://forums.tdiclub.com/showthread.php?t=181381

[stefan]

Re: Passat engine pulsing

Checked the alt pulley. Seems to be working as it should

[100%VAGitarian]

Re: Passat engine pulsing

run it without the belt. if it still happens, at least you've eliminated that. if problem goes away, there's your answer.

[stefan]

Re: Passat engine pulsing

run it without the belt. if it still happens, at least you've eliminated that. if problem goes away, there's your answer.

Good point...

[stefan]

Re: Passat engine pulsing

Booked in with Tunedub. See if George can pin down the issue...

[witchcraftz]

Re: Passat engine pulsing

Sounds like a good idea.

[stefan]

Re: Passat engine pulsing

Sadly, it decided to behave for George. So pretty much just driving her till she gets worse at this point.

[stefan]

Re: Passat engine pulsing

Finally got a check engine light. Looks like torque converter. Seems like a good time for a 5 speed swap...