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81

Saab 9-3 Sport Saloon / Convertible / Combi (Wagon/Estate) / Turbo X / AWD (2003 on) / Re: 93 V6 fuel pressure release.

« Last post by sgould on 14 April 2024, 11:13:28 PM »

That's my assumption, but to add a bit of confusion, SWMBO was out at her concert last night and the gauge dropped to empty again.  So either the heat of the sun has expanded the fuel, or the level sensor has failed completely.  She has been using the car, and needs it tomorrow, so it may be a while before  I can investigate further.

In the meantime the 9-5 is playing up.  Erratic starting.  Starts and misses, then stalls, try again and it'd fine.  Hopefully not the CPS, that's barely a year old.  No codes.

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Saab 9-3 Sport Saloon / Convertible / Combi (Wagon/Estate) / Turbo X / AWD (2003 on) / Re: 93 V6 fuel pressure release.

« Last post by carrera on 14 April 2024, 09:15:32 PM »

I'll put the investigation on hold for a few days.  As the level sensor only fails to read when the tank is over ¾ full, I planned to check a reading at the connectors behind the left hand headlamp.

Seems to indicate that one of the rheostats has dead spots at the top of the range ??

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Saab 9-3 Sport Saloon / Convertible / Combi (Wagon/Estate) / Turbo X / AWD (2003 on) / Re: 93 V6 fuel pressure release.

« Last post by sgould on 12 April 2024, 04:40:22 PM »

I'll put the investigation on hold for a few days.  As the level sensor only fails to read when the tank is over ¾ full, I planned to check a reading at the connectors behind the left hand headlamp.  There's a 10 pin and a 24 pin shown beside the battery.

Two things have stopped me.  Firstly I can't see any connectors where the WIS shows them.  They may have been moved as that area has the control box for the swivelling headlamps.  Secondly, the fuel in the tank was high enough yesterday evening for the gauge to show zero.  Today the level seems to have dropped a teaspoonful in refilling the rail and the gauge is reading correctly, so there's no failed circuit to find. Frustrating...

I'll just have to wait for the next tankfill.  I know that i could go and do it now, but I resent driving a six mile round trip to Tesco for two gallons. 

But a bottle of Forte wouldn't hurt.   But after messing about with the sensor yesterday evening, I cleared the code and it hasn't returned.  I can record the fuel pressure with CarScanner and save the graph.  I will try that, but it will be a bit hit and miss as it's not the car I usually drive, so it won't be monitored all the time.

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Previous model ranges FOR SALE & WANTED / Wanted: OG 9-5 airbox from petrol car

« Last post by carrera on 12 April 2024, 03:18:38 PM »

I'm looking for an airbox / air filter housing, part number 45 72 509 for the OG 9-5, any model year so long as it's from a petrol car, B205,B235,B308, diesels are different

Not expecting the mounting bobbins to be intact   

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Saab 9-3 Sport Saloon / Convertible / Combi (Wagon/Estate) / Turbo X / AWD (2003 on) / Re: 93 V6 fuel pressure release.

« Last post by carrera on 12 April 2024, 03:05:37 PM »

I was thinking along the lines of two independent failure modes, but from you decription, but perhaps the main one is nothing more than an irregular sensor result.

From reading around, it seems that this issue does only occur at start up or shut down. Does your scanner app have a logging capability so you can "see" the DTC being thrown ?

I see where you are coming from on the injector. That could be dirt, or simply a "sticky" injector, in which case perhaps clearing the code and 1/2 tank of fuel plus Forte might just do the trick

https://www.forteuk.co.uk/product/petrol-specialist-injector-cleaner/

You can get this, along with the general system cleaner for £25 on ebay

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Saab 9-3 Sport Saloon / Convertible / Combi (Wagon/Estate) / Turbo X / AWD (2003 on) / Re: 93 V6 fuel pressure release.

« Last post by sgould on 12 April 2024, 01:26:28 PM »

Now it's a bit warmer and my fingers are working a bit better, I will investigate the two fuel level sensors.

But the P0089 code for fuel pressure error is recurring and was happening well before the level sensor failed.

It's difficult to pin down.  The word on the forums (mainly American) is that the fuel pump is failing and that you need to drop the tank and replace the pump.  But I was dubious that it was the cause as the car ran well on full throttle without any hesitation. And has done so in the 5 years since it first occurred  At first I thought it was the sensor.  A new one seemed to fix the problem, but it returned after 6 months.  The sensor is closed off and is easily wiped clean, but actually shows no sign of any coating.

Then someone else suggested cleaning the fuel rail.  I tried that and the light went out - again for about six months.  The last time the engine light came on I cleared it without doing anything and it stayed off for several months.

I'm inclined to think that there's a short intermittent fault.  I have run a pressure test on a drive with both Tech2 and CarScanner and the pressure stays high.  It's not constant on the V6 as the pump is controlled by the ECU and varies the fuel pressure depending on demand.

Since the fuel rail cleaning seems to work, I'm thinking along the lines that there's a deposit of fine particles nearer the  far end, and maybe they break off and briefly prevent an injector closing, reducing the fuel pressure momentarily.  I would take out the rail and clean it properly, but it's quite an involved process on the V6.

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New Saab 9-5 (2010 on) / Re: Another Ng 9-5 joins the forum

« Last post by carrera on 12 April 2024, 01:06:51 PM »

Oooh, look. New Toys 

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Saab 9-3 Sport Saloon / Convertible / Combi (Wagon/Estate) / Turbo X / AWD (2003 on) / Re: 93 V6 fuel pressure release.

« Last post by carrera on 12 April 2024, 10:04:50 AM »

I say your 2020 UKS thread and the video also linked there, then looked at WIS.

Do you have the kit to do the pressure checking with Tech II ?

I note in the instructions there is a mention of "unsecuring" and "safety on" with the adapter. Perhaps it isn't a simple Schrader valve & there is someting on the adapter that allows the valve to operate to be able to read pressure.... to stop people like me & you simply depressing it to get sprayed in fuel 

Rather than the multiple cleans, why not simply soak the sensor in a bath of fluid. I would be tempted to carefully clean it as well. Nothing stronger than a finger tip, so long as the fluid doesn't irritate you.

As to system cleaners, the best is Forte, last time I looked it was about £25 for a bottle, so probably £35 now, it's what the up market garages use, because it works

Final point. In the testing there are references to having a minimum fuel level of 12% and the DTC being set when you run out of fuel. I seem to remember you have a fuel gauge problem as well, perhaps one fault is falsely triggering another ?

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Saab 9-3 Sport Saloon / Convertible / Combi (Wagon/Estate) / Turbo X / AWD (2003 on) / 93 V6 fuel pressure release.

« Last post by sgould on 11 April 2024, 09:10:37 PM »

I've been playing with the fuel pressure sensor today as the P0089 code has returned.  It's the third time in the last few years.  I've found that running neat fuel cleaner through the fuel rail seems to work. 

However, access is via the fuel pressure sensor in the line.  There's a Schrader valve adjacent to the sensor.  I released the fuel pressure via the valve.  Pressed it several times and there is no pressure and no release of any more fuel.  But when I take the sensor out, fuel sprays everywhere.  I'm puzzled.

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New Saab 9-5 (2010 on) / Re: 9-5 NG Rescue project

« Last post by TomPaine on 10 April 2024, 08:49:18 PM »

I think they're vanishing everywhere really. Even in cities that I always thought very Saab - Bristol, Oxford - their presence is evaporating. Alas.