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Cameron Dearden
Tinkerer
South Australia
UZZ30

Posts: 37
Reg: 10-2010

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 Saturday, February 05, 2011 - 06:48 pm, by:  Cameron Dearden (Crskmd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
*Posted this in mechanical but might be better suited here*

Hey all,

my soarer has been acting up lately.

mainly when you put •• foot down the car wont accelerate smoothly and the revs jump all over the place.

i have tried bridging the fuel pump ECU trick, didn't help at all.

Anyone else had this problem

I filmed what the 2 different things that happen now. EVEN IN NEUTRAL.

please watch the videos and let me know if any one has had similar problems. i would rather go to a mechanic and tell him the problem. instead of him having to find it first then fix it.

trying to rev up
http://www.youtube.com/watch?v=pYZzUqKrecA

foot is actually on the floor most of this video
http://www.youtube.com/watch?v=cwHEejYNKmc
Nathan Richardson
TryHard
N.T.
UZZ32 #445 (V8 Supercherged 5Speed. 291RWKW)

Posts: 444
Reg: 02-2006

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 Sunday, February 06, 2011 - 09:55 am, by:  Nathan Richardson (Richtheblack) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Wow, that is interesting!!! The car isn't revving by it's self is it?

It is almost like the TRC butterfly in the throttle body is playing up. Do you have TRC?

If so, maybe try disconnecting it and see how it goes.

Have you run an OBD by chance? Possibly a faulty wheel speed sensor of something.
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 12009
Reg: 11-2004

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 Sunday, February 06, 2011 - 10:25 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
So it got worse since you showed me the other day?

To drive it, if you put your foot down, the car seems to cut out around 3500 RPM, then cut back in again - rinse, repeat.

The car has no TRC.

I was thinking fuel starvation, possibly the fuel pump?
Cameron Dearden
Tinkerer
South Australia
UZZ30

Posts: 38
Reg: 10-2010

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 Sunday, February 06, 2011 - 12:10 pm, by:  Cameron Dearden (Crskmd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
yeah peter it has gotten much worse these video's it is under no load IE stopped in neutral
Cameron Dearden
Tinkerer
South Australia
UZZ30

Posts: 39
Reg: 10-2010

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 Sunday, February 06, 2011 - 12:13 pm, by:  Cameron Dearden (Crskmd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
oh and i almost forgot. my car sounds like it has asthma or is just breathing heavily in and out. this makes me think AFM or similar.

how do i run an OBD
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 6105
Reg: 03-2006

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 Sunday, February 06, 2011 - 02:57 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Sounds like faulty AFM .
Cameron Dearden
Tinkerer
South Australia
UZZ30

Posts: 40
Reg: 10-2010

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 Sunday, February 06, 2011 - 03:01 pm, by:  Cameron Dearden (Crskmd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
is there a way to test without putting a new one in?
David Boyle
TryHard
NSW
Soarer GT limited

Posts: 195
Reg: 05-2009

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 Sunday, February 06, 2011 - 05:04 pm, by:  David Boyle (Amokzar) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
unplug AFM and see if it makes a difference
Cameron Dearden
Tinkerer
South Australia
UZZ30

Posts: 41
Reg: 10-2010

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 Sunday, February 06, 2011 - 05:43 pm, by:  Cameron Dearden (Crskmd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
i tried that one. just had the Engine Electric System light stay on and it spluttered.

how ever i just went filled it up with 98 as usual and the problem seemed to improve... not go away but u can drive it around like grannie now :-)
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 12011
Reg: 11-2004

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 Monday, February 07, 2011 - 01:23 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Which comes back to fuel. If the pump ECU is OK, that leaves the pump itself, or the filter may be clogged.
Nathan Richardson
TryHard
N.T.
UZZ32 #445 (V8 Supercherged 5Speed. 291RWKW)

Posts: 447
Reg: 02-2006

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 Monday, February 07, 2011 - 02:07 am, by:  Nathan Richardson (Richtheblack) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Peter Nitschke wrote on Monday, February 07, 2011 - 01:23 am:

Which comes back to fuel. If the pump ECU is OK, that leaves the pump itself, or the filter may be clogged.



My next thoughts also.

Probably more so the pump. You haven't had stale fuel through it lately have you? Might be unrelated but stale fuel will kill a fuel pump.

If not the pump it's self maybe something in the electrical side of things like the relay. A test light would probably be worth while in this case.
Cameron Dearden
Tinkerer
South Australia
UZZ30

Posts: 42
Reg: 10-2010

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 Sunday, February 13, 2011 - 04:40 pm, by:  Cameron Dearden (Crskmd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
ended up taking it to sinergy for a diagnostic. came up with AFM error code, so they swapped it out for a new one just to test and the same problem was still there.

it seems to get better the more fuel there is in it.

my theory (probally wrong) is that when there is more fuel the weight of it helps push the fuel through the pump. and then when there is less fuel there is less pressure helping the pump and it struggles to provide enough fuel.

any way i can test if a new pump will fix it without having to buy one?
Matt Petersen
DieHard
NA
V8

Posts: 873
Reg: 01-2008

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 Sunday, February 13, 2011 - 04:55 pm, by:  Matt Petersen (Mattmannz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
I doubt the weight of the fuel in the tank is making it run better but to diagnose the fuel system you need a pressure gauge on the fuel rail to show you the operating pressure.

Matt.
Cameron Dearden
Tinkerer
South Australia
UZZ30

Posts: 43
Reg: 10-2010

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 Sunday, February 13, 2011 - 05:42 pm, by:  Cameron Dearden (Crskmd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Any idea why the less fuel there is the worse the problem gets then?
Matt Petersen
DieHard
NA
V8

Posts: 874
Reg: 01-2008

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 Sunday, February 13, 2011 - 05:49 pm, by:  Matt Petersen (Mattmannz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Nope but I would check the fuel rail pressure and volume to work out what's going on.
Ben Lipman
Goo Roo
SA
Soarer TT manual, plus TT track car

Posts: 2631
Reg: 04-2006

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 Sunday, February 13, 2011 - 05:59 pm, by:  Ben Lipman (Ben12a) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Broken or damaged fuel pick up? Some sort of blockage on the fuel pickup? Heaps of sediment in the tank? Crap fuel? Could be a lot of things.

No idea what the internal pump in the soarer looks like, but I can guarantee that the weight of fuel pushing on the intake versus the forces generated by the fuel pump will be negligable.
Matthew Weaver
TryHard
Victoria
Soarer TT

Posts: 441
Reg: 01-2010

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 Monday, February 14, 2011 - 07:16 pm, by:  Matthew Weaver (Spinna) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
the error code reads - Engine Electrical System
Cameron Dearden
Tinkerer
South Australia
UZZ30

Posts: 44
Reg: 10-2010

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 Monday, February 14, 2011 - 08:32 pm, by:  Cameron Dearden (Crskmd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
already knew that i posted it above.... but thanks anyway
Cameron Dearden
Tinkerer
South Australia
UZZ30

Posts: 46
Reg: 10-2010

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 Saturday, February 19, 2011 - 09:15 pm, by:  Cameron Dearden (Crskmd) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
seems fixed!

ended up draining fuel tank to find a whole load of rust sediment and other junk in there. the fuel pump turned out to be rooted and only pumped 100 lph if lucky. and it had the stock fuel filter/prefilter.

also needed new pickup lines as the where completely clogged up with CR*P
Matthew Weaver
TryHard
Victoria
Soarer TT

Posts: 451
Reg: 01-2010

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 Saturday, February 19, 2011 - 09:19 pm, by:  Matthew Weaver (Spinna) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 12028
Reg: 11-2004

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 Sunday, February 20, 2011 - 01:26 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Every few years, when doing a long trip, add some metho to the fuel tank.

It allows any water in the tank to blend with the metho and go through the system to be burnt along with the petrol.

Water by itself won't fit through the fine petrol filter.

Do it on a long trip so you use the contaminated fuel up and don't have the metho in contact with rubber seals etc any longer than required.

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