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Discussion Starter · #1 ·
Hi Folks,

My first post. My 11th Saab. Just had 7 years trouble free motoring with a BMW 320d, but it was never a Saab, it was boring and perfect, not like my old 99's and 900's.
I've just got hold of a beautiful 08 black Aero convertible, but the dreaded 'bing bong' limited performance message is not letting me put my foot down. Bought this car from a guy who needed the cash asap, so i only paid £3k for it, full history, 138,000 miles everything, but limited performance when i try to accelerate hard. Tech 2 message reads p0001-75 low fuel pressure! :mad:

I'm lucky to know the guys at MerseySwede in Liverpool and they have a donor car just sitting there. To try and fix this problem, we replaced the swirl flaps with a brand new pack which were in pretty poor condition. Same problem, so as a process of elimination, bit by bit, we have replaced everything we can think of from the donor car. Both fuel pumps replaced, EGR valve, all the fuel lines, fuel filter and fuel pressure sensor.

The car drives a dream, but if I put my foot down, it picks up, then there is a little dip in acceleration, before 'bing bong': limited performance.
If i turn off my ignition to the left for a second then back again it resets itself.
We have ran a couple of forced regens without affecting anything.
The car runs lovely and smooth, but when it needs that extra push, it gives up. It is a superbly reliable problem, not intermittent. It is a pig to start in the morning, which may confirm low fuel pressure?

Any advice would be so welcome. Got a beautiful car here, but no turbo boost :( Guys at MerseySwede are scratching their heads too?

Thankks

Neil
 

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Hi there,

Also, could be the sensor that is at fault or possibly a blocked fuel filter.

138k depending on age it should be due a cambelt service and waterpump replacement if not done already (every 70k or 6 years whichever comes first - from memory). I wonder if it has jumped a tooth on the belt.

depending on the year it may be the dpf needs doing.
 

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Agree with above about the possibility of a DPF issue. Tech 2 or OPCOM will show what the DPF saturation current status is. If it's over 80 percent, you'll have a problem I suspect. If the DPF is knackered, don't despair, you can pick up a brand new one off the 'bay for £200 but you would need to reset the DPF value in either Tech 2 or OPCOM to show a new one had been fitted if that is what the problem is.
 

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Discussion Starter · #4 ·
Thanks for the replies. The cambelt was done at 78k.

Popped to Merseyswede yesterday because my soft top would not work, turned out that wiggling fuse No:5 (40amp) about fixed it, but first we put the car through a thorough test with their Tech2.
Clear as a whistle apart from message 0001-75 low fuel pressure again.
Fuel filter was changed along with all fuel lines from the donor car: still have the same problem.

Roy, the owner of MerseySwede is confident the DPF is not the issue. There is no indication on the Tech2, engine runs beautifully and we have done a couple of forced regens with no difference.
The car pulls lovely, but when I put my foot down to say hello to the turbo's, it picks up momentarily, but when it needs that extra bit of oomph, there is a little lull in power then that polite 'bing bong' : Limited performance message and as you know; limp mode.

Low fuel pressure is the issue, but we have change the high pressure and low pressure pumps, even replaced the whole bloody fuel tank. Roy has suggested a remap may fix it, because this would make the brain give the injectors more fuel when it craves it, but i spoke to Demon Tweaks who said no, its a car problem, not a map issue.

Its a beautiful car, and I always look back after i've parked it. If I can get this issue fixed, i'm going to be a very happy Saab owner, but at the moment, its just a straight 2 litre engine :confused:
 

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http://www.saabscene.com/forum/threads/148885-Low-Fuel-Pressure-9-3-1.9tid-Sport
As to a remap that in my mind would be a complete minefield ,
You woukd be paying 400+ for a remap that would not cure the cars fault .
So to suggest a remap to sort out the problem , that don't sound right to me .
Also the cambelt is way over due in my mind 40.000 miles or 4years , any more and your on borrowed time ( that's a personal thing ) it's cheaper than a complete engine rebuild .
Is the second turbo cutting in ? .
 

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as already said the cambelt,waterpump,tensioner and rollers are WELL over due a change with that mileage...fuel low pressure code is a minor inconvenience..you NEED to get the belt and associated parts changed ASAP..
 

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Discussion Starter · #8 ·
Sorry guys, cam belt and all gibbons done at £92k, I'll get it done again very soon.
Fuel rail is the same old one, how would I check this?
The turbo guage moves up with the increase in urgency from the throttle (my foot), but it just runs out of puff when things should get going. I've had a 99 Turbo, 900t 8v, 900 t16, so I know what a lovely boost is, but this gives up the ghost (bing bong) when things should get going.
Roy at MerseySwede says the turbos and pipes were checked along with the hoses, all all are spot on.

They have a Tech2, but I'm thinking because there is no specialist Saab training anymore, these specialist bits of kit are turning into glorified error readers now? (Mine is 0001-75 low fuel pressure). At the point of which my car asks for more oomph, it's just not there?
Tried to overtake a Fiat panda earlier and had to pull back in, Bing frigging bong! I'm starting to lose it! :-(
 

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Feels like you've been on a wild goose chase. There is a known issue with the wiring to the fuel rail pressure sensor connector (on a few vauxhall forums) Get this checked out before all else...
 

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Discussion Starter · #10 ·
Thanks Raj, Vauxhall forums have a code P0001-75 which guess what, is 'Low Fuel Pressure'. Attributed to Fuel pressure sensor on the rail. Investigation!! :thumbsup:
 

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check the plug for oxidization retracted pins etc and the pins on the sensor first, could be a break in the cable going to the sensor plug which is not uncommon. before getting a new sensor

p.s not sure if Vauxhall still do the repair kit or you could get a doner plug with x amount of cable attached
 

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Discussion Starter · #12 ·
Hello again,
My car still goes into limp mode (bing bong) whenever I put my foot down. Bought a replacement fuel pressure sensor which took a minute to change, hey presto, same damn problem. Traced the cable as far back as humanly possible, it looks perfect, no tears, splits or twists.

My friends at Merseywede have taken almost everything off a donor car, yet the only code which still comes up on their daignostic is P0001-75 Low Fuel pressure.

Got a gorgeous twin turbo here, that is not getting enough fuel. It will accelerate, but the moment something good starts to happen: bing, bong!

Does anyone in the NorthWest have a diagnostic that we can plug in. Someone who knows how to use it properly. Prepared to pay and travel?

Thanks!
 

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Discussion Starter · #17 ·
I'm still in the same boat. Foot down; bing bong; reduced performance message. Error code P001-75. Low fuel pressure?

As recommended; Fuel pressure sensor changed, same old problem.

Is there anyone out there with a good diagnostic Tech-2 or equivalent who 'knows' how to read and use it. Garages i have been to, get this code, and then the guys start Googling the answer?

Theres a steep hill on my journey home, bit embarrasing in my ttid Aero tootling up it in 2nd gear at 20mph to avoid the limp mode, with a line of small cars behind wondering why i'm driving so carefully? :(
 

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I'm still in the same boat. Foot down; bing bong; reduced performance message. Error code P001-75. Low fuel pressure?

As recommended; Fuel pressure sensor changed, same old problem.

Is there anyone out there with a good diagnostic Tech-2 or equivalent who 'knows' how to read and use it. Garages i have been to, get this code, and then the guys start Googling the answer?

Theres a steep hill on my journey home, bit embarrasing in my ttid Aero tootling up it in 2nd gear at 20mph to avoid the limp mode, with a line of small cars behind wondering why i'm driving so carefully? :(
OP/Com or Vaux/com will allow you to log the fuel rail pressures while driving.
 
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