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PostPosted: Wed Apr 17, 2019 6:10 pm 
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Joined: Fri Feb 12, 2016 4:53 pm
Posts: 28
Location: London
Car Model: Saab 9-3 SE 1999 V reg
V reg 9-3 SE 140.,000 ish miles on the clock.

When pulling away/changing up the gears if I don't change quickly eg I let the revs get too high the car begins to jolt/judder, it feels a bit like pulling away in 2nd gear. As soon as I change gear it's fine. I can be all the gears or just one depending on the day, somethings it doesn't happen at all.

It's been suggested by a petrol head friend that it's the clutch but my mechanic thinks that it could be electrical but he'd need to plug it into a diagnostic machine.

Anyone ha this happen?

Thanks.


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PostPosted: Wed Apr 17, 2019 6:16 pm 
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Saab Nut

Joined: Tue Mar 25, 2014 5:41 pm
Posts: 1205
Location: Kippen STIRLING
Car Model: 9-5 Aero Sportwagen and more
blockhead,

At V reg it's probably got T5 control system so will have an APC valve that gets a bit sticky. When this happens the ecu cuts fuelling to the engine momentarily because it 'thinks' that the turbo pressure is too high. Clean it out with carb cleaner and all should go fine again.

Paul @ Kippen


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PostPosted: Wed Apr 17, 2019 8:08 pm 
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Joined: Wed May 12, 2004 9:53 pm
Posts: 16589
Location: Devon
Or it could be ignition. How are the plugs? How old? Correct gap? Correct type (very important!)?

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PostPosted: Sat Apr 20, 2019 2:24 pm 
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Joined: Fri Feb 12, 2016 4:53 pm
Posts: 28
Location: London
Car Model: Saab 9-3 SE 1999 V reg
Thanks for the reply. Now you mention the fuelling it does actually feel like the fuel cutting out.

I assume I don't remove the APC to clean but just follwo the instructions on the can of carb cleaner (spray into the air intake)?

I poured a bottle of Wynns Xtreme Petrol System Clean into the tank and done an hour up and down the M3 but the problem was still there, hitting 2,800rpm (even in 5th gear at 70mph) and the needle started jumping and the feeling of the fuel not getting through, lowered the revs and the engine went back to normal.

Paul Anderson Kippen wrote:
blockhead,

At V reg it's probably got T5 control system so will have an APC valve that gets a bit sticky. When this happens the ecu cuts fuelling to the engine momentarily because it 'thinks' that the turbo pressure is too high. Clean it out with carb cleaner and all should go fine again.

Paul @ Kippen


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PostPosted: Sat Apr 20, 2019 2:26 pm 
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Joined: Fri Feb 12, 2016 4:53 pm
Posts: 28
Location: London
Car Model: Saab 9-3 SE 1999 V reg
Thanks for the reply.

I'll look at the plugs, they're probably a bit older than they is ideal.

BillJ wrote:
Or it could be ignition. How are the plugs? How old? Correct gap? Correct type (very important!)?


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