Fuel cut/MAF advice.......

[bakerboy-2007]

Hi guys just after some info...
My vr been playin a silly game over about 4 weeks, I will do my best to explain what has been happening...

Started on a long journey when at constant speed exhaust tone dips and car feels to loose momentum but rpm doesn't drop just a slight power loss an slight juddering if I hold the speed, I put accelerator peddle down car picks up and no issue untill sitting at steady speed it does it again,

Also if I boot it hard car goes like a train upto around 120mph then it's like hitting a wall the car jolts and power loss!!! If I accelerate steady she will hit 145 without missing a beat and hold it !!!

Iv pulled the codes nothIng flashing !!

My mechanic friend questioned fuel delivery so I changed the petrol pump and FPR for used items I sourced but car still playing up ,

I have been looking at threads on fuel cut and this could be the issue, questiOn being could my MAF be on the blink ????

As I understand it measures the amount of airflow and reports to ECU which then inputs enough fuel , It does sem to be runnning rich as working out 17-19mpg taking it easy !!!!

As always all advice much appreciated

[Davezj]

has you car been delimited for speed as 120 shows on the dash when you hit the 112mph speed limiter.
when i hit the speed limiter in first VR4 it was like hitting a brick wall all power gone for what seemed like 2-3 seconds then it come back. but i never tried to go any quicker than the displayed 120mph (on a private test track of course).
so i don't know if will let you increase your speed past the limiter if you accelerate more slowly.
have you turned the boost up, past the factory past the 0.6 bar standard. i have never hit fuel cut at staock boost.
the only time i have heard of people suffering with fuel cut is after the boost is turned up. if you have turned it up, turn it back down until you don't hit it.

[ianturbo]

Hi guys just after some info...
My vr been playin a silly game over about 4 weeks, I will do my best to explain what has been happening...

Started on a long journey when at constant speed exhaust tone dips and car feels to loose momentum but rpm doesn't drop just a slight power loss an slight juddering if I hold the speed, I put accelerator peddle down car picks up and no issue untill sitting at steady speed it does it again,

Also if I boot it hard car goes like a train upto around 120mph then it's like hitting a wall the car jolts and power loss!!! If I accelerate steady she will hit 145 without missing a beat and hold it !!!

Iv pulled the codes nothIng flashing !!

My mechanic friend questioned fuel delivery so I changed the petrol pump and FPR for used items I sourced but car still playing up ,

I have been looking at threads on fuel cut and this could be the issue, questiOn being could my MAF be on the blink ????

As I understand it measures the amount of airflow and reports to ECU which then inputs enough fuel , It does sem to be runnning rich as working out 17-19mpg taking it easy !!!!

As always all advice much appreciated

if you can cure this let me know mines been like that for 4 years !!if it don't do the cutout thing then go again ill miss it !!
ian

[bakerboy-2007]

Thanks guys

Car is runnIng stock boost now

Nick Mann will be along in a mO to correct me if I get this wrong but engne was replaced with nuttrjohns old one an was running 350bhp once, car was fitted with map 2 and updated FPR and fuel pump and ebc but this all removed and returned to stock before I bought the car

Iv looked for boost leaks but nothing

I might fit an mbc and guage over the weekend and see if I can cure it with messing with boost limit???

Could it be clutch slip ?? It's an auto!! Oil ruby red !!!

[ianturbo]

i put a MBC on mine and it does the same ,the engine missfires then after a few seconds picks up again , i went on rollin road day hopin to get some answers but no it ran like a dream !!
ian

[Nick Mann]

The cars history is pretty much as you have said. I wonder if an evo scan log would show anything up?

[bradc]

evoscan would make sense to see what happens to the maf values when the problem occurs.

[bakerboy-2007]

Anyone local with an evoscan?? Or is it cheaper to buy the cable n software ??

Thanks for your time chaps

[Davezj]

if you just want to log data the $25 for the software and £15 for a VAG COM cable from ebay is the cheapest way to do it.

unless evoscan software has increased in price but it cost me $25 with lifetime upgades.

[bakerboy-2007]

Cheers rave I have just found the thread

Ian have you tried swapping you MAF ???

[ianturbo]

yep swapped MaF but still , its hard to say but engine seems to shut off for a second and then goes again , am used to it now though ,

ian

[bakerboy-2007]

Yeh that's how it is pal ...

You say yours has bin doin it for 4 years ! No adverse affects on the engine???

[ianturbo]

Yeh that's how it is pal ...

You say yours has bin doin it for 4 years ! No adverse affects on the engine???

its not blown up !! (yet )
ian