[Lionborg]

Hi fellow R32 owners.
Let me start by introducing my self, im Kasper and i'm from Denmark (sorry for my english, its not my first language), i've had my Golf V6 4M for about a year, when i swapped the engine for a R32 with 95.000 miles on it and new timing chains.
Now i've been driving it for about a month and what a diffrence! wow. Great engine.
BUT ! i have a little problem with hesitation. I read some other threads about R32 hesitation, but my problem is not the same as other discribe theirs.
When i drive normal in, lets say 2. gear, and give it full throttle, the car hesitates for a few seconds and then pull like it should. The funny ting is,its not allways but maybe 60% of the times i accelerate.
I've had my VCDS on and no DTC's :S
While driving i opend block 060 i mess. blocks and watched while accelerating, and when hesatating the throttle body is stuck at 35% for a few seconds and then opens full, and pulls like it should.
Now i just went for a longer hiway drive, and after 30min. i had an EPC lamp on (still no DTC's). When that lamp is on, the car no longer hesitates, why?
This EPC lamp resets itself and the car is back to hesitation.

I've tried changing brake-light switch, clutch switch, MAF and throttle body alignment but no difference.
What should i do now?

 

[PaulW]

Did you clean the TB? Or just re align?

 

[Steff]

Sounds like it could be a misfire, usually caused by a coil pack but that should show up when scanning.
Could also be a vacuum pipe? Worth a look!

 

[CorradoR32]

No need to apologise for your English. It's better than some English peoples' English

I would do a 20-30 min drive and data log as many sensors as you can. MAF, knock, injectors, misfire counter, throttle angle etc etc.

If you're seeing a lot of knock (more than 7 counts), it could be the ignition retard that's holding you back. I don't know if it pins the throttle at the same time or not, but it wouldn't surprise me.

At what temperature does this happen? R32s can be a bit hesitant whilst they warm up.

Any air leaks? Have you confirmed the intake manifold flap is working as it should?

 

[Lionborg]

Thanks for all the replys.
First, i cleaned the tb and then re align.
I'm pretty shure theres no vacum leaks.
I thought about the coils but then i think i would se a DTC.

Thanks CorradoR32. How do i data log? I havent got my vcds for vers long.
This happens at all temperatures.
Intake manifold flap will be inspected tomorrow, but i Think it works. It must chance at 1100 rpm and then again at 4200 right?

 

[CorradoR32]

Mine is very hesitant when it's warming up but is generally OK when hot, but not always. I do find the inconsistent power delivery of this engine quite frustrating at times. You'll go for a gap in traffic and the motor doesn't pull like you expect it to, and then you'll be driving slowly in a supermarket carpark and it tries to take your head off with savage acceleration! Strange!

Anyway, the data log function is in the Measuring Blocks page. It writes an MS Excel file to your laptop recording all the sensor values you chose to monitor for the whole journey, so make sure your laptop battery is well charged before setting off!

There's more info here - http://www.ross-tech.com/vcds/tour/logging.html

Yep, with an assistant stabbing the throttle at idle, you should see the flap pull down at 1100rpm. It's also load dependant, so a light throttle press might not move the flap. Press the throttle firmly.

 

[jon_R32]

Mine does the same kinda just waits for a second then it's off! In the car park when you dont want it too as above ill try to snap you neck.

 

[PaulW]

Mine does the same kinda just waits for a second then it's off! In the car park when you dont want it too as above ill try to snap you neck.

Why you gonna snap his neck?

 

[CorradoR32]

I might data log the pedal position and throttle position measuring blocks and see what's going on. Compare to requested throttle to actual.

I suspect it might be a nanny state thing. "You're requesting too much throttle for the road speed young man, tut tut".

I might try driving around with the ESP off and see if that makes a difference.

 

[Lionborg]

The changeover valve works.
Okay i will try the data log thing tomorrow, wich blocks do i need to log? I can only choose 3 right?

I think youre right about the nanny state thing, too bad you can't turn it off

I tried driving with ESP off, and no change.

 

[jon_R32]

I might data log the pedal position and throttle position measuring blocks and see what's going on. Compare to requested throttle to actual.

I suspect it might be a nanny state thing. "You're requesting too much throttle for the road speed young man, tut tut".

I might try driving around with the ESP off and see if that makes a difference.

Iirc BMW used to do something like this one the m3evo e36 model. But it's a good point on the ESP as tbh I rarely turn mind off!

 

[Lionborg]

Hi guys. New update, i still havent data log'ed anything because my pc has a bad battery so i need another.
But yesterday when i was driving on the highway, the EPC lamp and the one that shows an engine, came on. So i put my VCDS on and got 2 engine fault codes:
16825 - EVAP Emission Controle Sys: Incorrect Flow
P0441 - 002 - Lower Limit Exceeded - Intermittent
16485 - Mass Air Flow Sensor (G70): Implausible Signal
P0101 - 008 - Implausible Signal

And there was no hesitation, the car pulled like it should, GREAT to drive. Then when i started it today, the lamps were off and back to hesitation

So i tried pulling the connector to the MAF off, and same reaction as yesterday, pulls just like it should..! Do i have a wrong MAF?
I started out with a MAF from my 2.8 24V (because VW said it was the same one), then i changed it to a new one (bought for a R32) and still no change, so my MAF cannot be faulty, but it could be wrong?
MAF: 071 906 461 B

 

[CorradoR32]

Is it a MK4 R32 engine you fitted? MK4 and MK5 engines use different MAF sizes.

I think what you're describing there is symptoms of the ECU not liking the MAF signal, so it's bypassing it and using throttle position for load instead. Although it may feel better to you with the MAF bypassed now, it will be better still with a happy MAF signal

I would data log the MAF signal on a full throttle run in 4th gear. A working MAF on a standard engine should give a peak signal of around 195 grams/sec. If you are measuring a lot lower than that, there's definitely a problem.

With the EVAP emission control, check the connection on the solenoid for the carbon canister. You can also run an output test in VCDS for that valve. I think the ECU is not seeing the extra fuel it's expecting to see from the fuel tank vent.

 

[Lionborg]

Its a MK4 engine i've fitted, but the ECU was remaped by the former owner, and i did't get the MAF, the flex pipe from the throttle body or the airbox. so don't know if the former owner did the DSG MAF remap ? and of course now i cannot get in contact with him, because it was more than 1 year ago.

I will try data log when i get another pc hopefulle this week.

 

[Lionborg]

Problem solved!
Today i bought a DSG MAF, and it turns out the former owner got the ECU remaped for the DSG MAF. Now it drives perfectly !
Thanks for all the reply.

 

[CorradoR32]

Good news! It had to be something simple like that!