Went to Northwest meet today but have noticed some hesitation. Only seems to occur over 100mph in 4th & 5th when pulling hard, kinda misses a beat for a second making the whole car judder. :rolleyes:

 

I've renewed the injector connectors recently hoping this would sort it but it hasn't.

 

As I say car pulls sweet upto 100mph in 3rd problem only occurs from there on. Also seems a bit on the weak side over a 100mph, just doesn't seem to want to accelerate as it used to.

 

I've checked fuel pressure and that is spot on.

Runs 1 bar boost.

 

Could it be PTU on it's way out, or maybe a coilpack?

 

ECU diag says all clear magic 55 :rolleyes:

 

cheers Jon. ;)

 

Anybody have any ideas what to look for.

if you wanna swap ptu to try just ask jon

 

Mike

if you wanna swap ptu to try just ask jon

 

Mike

 

Might take you up on that! Only really became evident today having a blast out something not quite right...

I had similar and it was fuel pump, as I got up to speed it used to have to tink about it!!! not the case on yours as the fuel pressure is ok.

As the weather is sh1te at the mo could the MAF be playing up, I understand they do this.

Hope you get it sorted.

I had similar and it was fuel pump, as I got up to speed it used to have to tink about it!!! not the case on yours as the fuel pressure is ok.

As the weather is sh1te at the mo could the MAF be playing up, I understand they do this.

Hope you get it sorted.

 

When I say I've checked the fuel pressure I mean at idle, I suppose I need to check it at load to see if it's still the same. Would a consult be of any use here anybody have one that could perform a test.

Sounds really MAFish to me... mine did that once I had a cone and whanging tubs on it. It was sucking in so much air the MAF lost the plot. :D

 

If your MAF is dicky you'd see the same thing even at stock flow...

:rolleyes:

 

Tried Kirbz AFM did'nt make any difference, checked timing which was way out at 8 deg BTDC :shock:

set that to 15 deg BTDC wow what a difference.....so much more torque now...

 

But still have a problem. Changed spark plugs to see if that made any difference but still the same.

 

Seems to be boost related but only really shows up in 4th and 5th gears.

In 4th doing about 80mph at around 4K Rpms starts to kangaroo and splutter, and by just holding the acc pedal in that spot will make the engine jerk between 4K - 4.5 Krpms, really weird.

 

Doesn't seem so bad with my boost controller off on stock boost but it is still apparent.

 

Anybody have any more suggestions, guess I really need to put it on a consult... :rolleyes:

 

cheers Jon.

It's not pinking a bit, is it ?

It's not pinking a bit, is it ?

 

No doesn't appear to be, it's as though the engine is cutting out momentarily, and similarly again when coming off power...

 

cheers Jon.

4-4.5k is peak torque... could the clutch be slipping slightly so it's as if you're kangerooing? This would explain why it's only 4th and 5th...

Sounds like fuel pump on its way out. It can manage pressure fine on lower flow rates but once you get onto seriously high load it must provide the pressure at much higher flow rates - harder work... Not that difficult to swap to try that theory out. Could also be the fuel pump controller not switching to high output for WOT...

Sounds like fuel pump on its way out. It can manage pressure fine on lower flow rates but once you get onto seriously high load it must provide the pressure at much higher flow rates - harder work... Not that difficult to swap to try that theory out. Could also be the fuel pump controller not switching to high output for WOT...

 

 

Cheers guys, Andy that was on mine mind M8 tbh, all very well checking fuel pressure at idle but when on full load i.e 4th & 5th....

The clutch isn't slipping, besides I put an RPS jobby in...

 

I think next step is to swap the fuel pump and if ain't that I'll try the fuel pump controller....

 

cheers

 

Jon.... :)

looks like my fuel pump is going for a ride in another car ;)

looks like my fuel pump is going for a ride in another car ;)

 

Aha, nice one M8, hopefully it will be that or the controller, I will give you a buzz.

 

cheers Jon...

:( :cry:

bugger, bugger, remembered that I had an old fuel pump bit noisey but worked OK, swapped it tonight and no change still same problem.... :(

 

Tested the volts at fuel pump connector, I got 3V when first turning ignition on (priming) then 13V when idling, so would this rule out the fuel pump controller i.e seems to be supplying correct volts to the pump or would it be worth swapping that just in case. :confused:

 

cheers Jon.. :)

any joy with his?

Where is the fuel pump controller located?

just done this on mine

its behind the passagaers seat area behind the side pannel 2 10mm bolts hold it on

Cheers Mate

Anyone know if this problem was solved, was reading with interest but as usual there's no ending!

 

Mine developed a similar problem last night, and am searching for what to try.