Question about 2003 Saab 9-3

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Saab 2006 1.9tid 150 acceleration problems to 2000 revs when turbo kicks in and accelerates well from then on recently had new EGR valve fitted fuel filter and fuel solenoid poor running at idle been told probable air mass meter

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This is usually the first (cheapest) place to start. The MAF (mass air flow) meter is designed to sense and adjust the vehicle engine to changes in air temperature, speed, density etc. to keep your vehicle running properly. Since you already had your EGR replaced (yet another possible source of this sort of problem) I would tend to lean more toward the MAF. If you run any sort of aftermarket intake such as a k&n etc. these can cause problems for certain vehicles that are very sensitive to air flow as Saabs tend to be. Also the oil used on filter elements such as k&n can ruin the sensitive MAF. This unit is generally easy to fix (it's the little box with wires running to it) mid way up your air intake tube just past the filter. They aren't too terribly expensive either. Try this and hopefully this gets you up and running.

Posted on Dec 12, 2009

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My saab 95 1.9 tid revs fine in neutral when put in drive and pull of there's no power won't go above 3000 ram any ideas


HI Derek.

There are a few possibilities that come to mind.
3K RPM is generally about the break-even point for when Turbo boost would kick in. There is a dump valve on the turbo system that opens up and vents the extra turbo pressure under high-rpm situations where the boost isn't needed - say high but steady speed on a freeway. If the dump valve system is malfunctioning, then that anticipated turbo run-up in power won't happen.

Revving fine when in neutral may not tell you much, other than that the engine can rev. The gating system will (or should) run differently under load - whether climbing a hill or accelerating, this is where you want the turbo boost to give you the extra power. THat's where the exhaust gate should stay shut, or mostly shut, to allow the turbo to force more air into the pistons.

You might want to check whether the APC (Automatic Performance Control) for the turbo has a separate fuse. (The name might be different on your model, I'm remembering from my 80s/90s era Saabs). If the fuse is blown, that could also lead to lame performance, especially as I'd imagine that the system would be built to fail or go to full open if the APC fails or loses power - that'd keep people from having run-away power that they can't manage.

Hoping this helps

D

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1 Answer

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Three areas you should look for: o2 sensor, MAF sensor and the EGR valve. Try cleaning the EGR and MAF and also clean the fuel injectors using injector cleaners. This should solve your problem. If required, also replace the air and fuel filters.

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Before you end up with a huge repair bill I would strongly advise you to have the fault codes read by a main VW dealer. A faulty EGR valve will show up immediately in this case or the diagnoses will quickly point elsewhere.

Main dealers have the proper software for reading faults stored in the cars computer and it is not that expensive to have this done. Most will do it for around £40 - check with them beforehand of course! Small independents usually have a generic fault reader which is generally quite unreliable at diagnosing this type of fault.

In this particular case the best case scenario is a faulty EGR valve. Worst case scenario is that either the injector pump or turbo is faulty. These can all cause the symptoms you describe. Get the fault read then take the car back to the local garage to have the work done and so save on labour rates.

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1 Answer

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Check your fuel filter and engine air filter. Sounds like your engine cannot breath or is not getting the proper amount of fuel to run well. Possibly also check your fuel pressure regulator.
Justin
Strictly Saab
Melbourne, FL

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