Hi Guys - just got my car back from a service a few days ago and since then the car idles funny and misfires when cold. Took it Ferroli and it came up with some errors. something about misfire on all 4 cylinders . what could be the cause? I mean the car was fine before the service at VW grrrrr.
Mileage = 98000, REVO stage 2.

Maybe coilpacks?

Donnie Darko wrote:Maybe coilpacks?

+1

could it not be cam position sensor?

Just funny how all 4 coilpacks would go at the same time but also probably not impossible?

PoloGTIman wrote:could it not be cam position sensor?

Just funny how all 4 coilpacks would go at the same time but also probably not impossible?

yeah was also fine before the service

Do you have the error codes?

Shygolf wrote:Do you have the error codes?

did'nt think of saving them , saw them at Ferroli's. but it was basically misfire on every cylinder as well as somelow frequency on 02 sensor?

Take it back to VW, and make them sort it out with a smile

coils buddy

mine did the same when I had APR stage 2 on the car.
Took it to VW The Glen and when came back Misfired. Fitted new coils and plugs and was sorted.
Have not loaded software since.

Did you tell the dealer you have software?

Error Codes?
EPC light on,..Mayb they **** the HPFP Sensor

Perhaps Coolant temp sensor?

What exactly did VW do in the service? Any parts they replaced?

Burner1144 wrote:Perhaps Coolant temp sensor?

What exactly did VW do in the service? Any parts they replaced?

Oil change and rear brake pads.

If they washed engine then coil packs.
My buddy tooook his S3 in for oil change samething happend.
Does it also idle like it has a cam in it?

g60 golf wrote:If they washed engine then coil packs.
My buddy tooook his S3 in for oil change samething happend.
Does it also idle like it has a cam in it?

Eish - I think you're correct
it idles rough and the bay was washed

It's only when the car is cold though - this morning same thing, after 20 mins the car is 100% again.

Update -

replaced the coilpacks and plugs, replaced thrust sensor and cam follower.
the misfire is still there, but not as bad and as often as before.

any other advice would be appreciated.

Is it possible the dealer tried to update my software and messed up REVO?

GV wrote:Update -

replaced the coilpacks and plugs, replaced thrust sensor and cam follower.
the misfire is still there, but not as bad and as often as before.

any other advice would be appreciated.

Is it possible the dealer tried to update my software and messed up REVO?

possible!
Did you check HPFP Sensor?

Camo wrote:

GV wrote:Update -

replaced the coilpacks and plugs, replaced thrust sensor and cam follower.
the misfire is still there, but not as bad and as often as before.

any other advice would be appreciated.

Is it possible the dealer tried to update my software and messed up REVO?

possible!
Did you check HPFP Sensor?

nope - how do I do that ?
where is it located?
Thanks

PCV fine?

GV wrote:

Camo wrote:

GV wrote:Update -

replaced the coilpacks and plugs, replaced thrust sensor and cam follower.
the misfire is still there, but not as bad and as often as before.

any other advice would be appreciated.

Is it possible the dealer tried to update my software and messed up REVO?

possible!
Did you check HPFP Sensor?

nope - how do I do that ?
where is it located?
Thanks

On top of your HPFP!
Normally when it is cracked it will misfire and also give EPC light!
your car will starve from fueling. I got a permanent fix for it if broken.

Camo wrote: On top of your HPFP!
Normally when it is cracked it will misfire and also give EPC light!
your car will starve from fueling. I got a permanent fix for it if broken.

no EPC light.
is this not the same as the thrust sensor?

When last was the cam follower changed? Is it 100% still?

GV wrote:

Camo wrote: On top of your HPFP!
Normally when it is cracked it will misfire and also give EPC light!
your car will starve from fueling. I got a permanent fix for it if broken.

no EPC light.
is this not the same as the thrust sensor?

The HPFP has two Sensors,..The one on the TOP normally gives kak! I see you made mention that the Thrust Sensor and the Cam follower have been changed.
Do you have a pic of the old cam Follower and can you take a pic of the HPFP to see if the TOP Sensor not Cracked!
Mine never gave EPC light until the crack was worse. The car had very bad misfire and thought it was coils.

When I went to Shaheen @ E-Tuners we found TOP Sensor on the HPFP cracked.

I'm starting to see more misfires on my car as well. Will check the HPFP... m-plan ends in September ...

Any car needs 3-Things to function properly:
-Fuel
-Air
-Spark

That is your basic that you need to check when you have a misfire.

Camo wrote:Any car needs 3-Things to function properly:
-Fuel
-Air
-Spark

That is your basic that you need to check when you have a misfire.

This much I know.
My misfire count tends to increase when I blip the throttle at idle. Given that at that point the rail pressure changes suddenly and quickly, the HPFP would be a logical place to look.