S6 timing

[GrantGam]

Hi all, I was advised to repost in this thread with a bit of advice I posted today; worth a shot as it worked for me.

If having issues (like I was) with intermittent stuttering at high revs >3000rpm, this is caused by the fuel pump cutting out to protect the engine: "limp mode". One reason for this can be a dirty MAF sensor. The sensor is easily removed by removing the jubilee clip and two bolts, then using a cotton bud and contact cleaner, gently clean the metallic sensing element inside the chamber. This was the definite cause of intermittent 'limping' which I didn't even know existed at the time. I thought I had an engine timing/misfiring problem. Luckily, it was an easy and free repair that even I managed; albeit after having the fuel filter, air filter, oil filter, engine oil and spark plugs changed at the garage

Take it easy, Grant

[HMS-S6]

Hi. Mine isn't the fuel cut, it's far far less severe!

I just drove it on a very quiet wide road and WOT from below 3000 rpm it stutters and holds back all the way to 7,000rpm, very rarely clearing but sometimes does. HOWEVER if I take it on light throttle to 4,500 then hit WOT it pulls dead right EVERY TIME without fail. Any ideas anyone? Anyone? Please.

[HMS-S6]

Dmitri?

[newsh]

Are you getting a good solid 14v to the battery when the engine is running?

[HMS-S6]

Are you getting a good solid 14v to the battery when the engine is running?

Yes mate. Even checked it today while I was running my fuel pump for the flow test.

[newsh]

"Sigh" Well if it helps.. I'm thinking about your car all the time too

[HMS-S6]

Hahaha. Come have a drive of it if you wish?

[newsh]

S6 timing

Has Tonks seen the car?

[HMS-S6]

No mate. Nor has Danny from DNA. Both aren't far from me! I'm always worried of getting the response I've had before "it's not that bad" when I know full well it's definitely off the boil.

[newsh]

What's the wideband showing when it holds back? In comparison to when it pulls properly?

Is there a difference in boost?

Is the WG spring a stock item?

[HMS-S6]

Now the stock ECU has been on for a while I'm going to rig the wideband back up today and see what it's saying!

The boost is the same regardless of how it runs, it seems to have no bearing on its fault.

Yeh the WG spring is standard.

I do appreciate all the help, it really is the weirdest fault. If you were to drive it over 4,500 you'd never know the car had a fault. It seems to be related to the peak torque area!!!

Who would you suggest I ask to drive it for an opinion?

[newsh]

S6 timing

Edit. Yes, peak torque..

The difference I see between WOT at 3k and 4k5 is that at 3k you have full spool but only 3000 rpm to use the pressure. At 4k5 the motor can swallow 1.5 times the amount of fuel and air, in a way it's having an easier time dealing with the boost.
So what's happening that's sending the motor "out of tune" at 3k.
3k to 4k should be the most exciting rpms on a stock turbo, it's where you get the big push, or even 2k5 -3k5?
It's a long time since I drove a standard car.

[newsh]

Brian or Danny both know what these cars should go like. It's a bit far for me to come from Surrey.

[HMS-S6]

Edit. Yes, peak torque..

The difference I see between WOT at 3k and 4k5 is that at 3k you have full spool but only 3000 rpm to use the pressure. At 4k5 the motor can swallow 1.5 times the amount of fuel and air, in a way it's having an easier time dealing with the boost.
So what's happening that's sending the motor "out of tune" at 3k.
3k to 4k should be the most exciting rpms on a stock turbo, it's where you get the big push, or even 2k5 -3k5?
It's a long time since I drove a standard car.

That's right on the nail Bud. When it's right I love short shifting and using the mid range torque and I just don't have any!!!
It's like poor spark but with the Red COP conversion surely that's ruled out?

[newsh]

S6 timing

You'd think so, unless the voltage to the coils is low for some reason.
See what the WB says, it think if it's a misfire it will show lean.