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Re: 2000 9-3 intermittent hesitation
Posted by TimF (more from TimF) on Thu, 26 Jul 2012 21:33:27
In Reply to: 2000 9-3 intermittent hesitation, David Hornstein, Wed, 25 Jul 2012 09:16:22
Do you have the right computer for the 2.3l engine? Assuming you do...

If during acceleration, best guesses are the the ECU detecting bad knock and then cutting spark or not enough fuel (which is the same thing because you'll go lean then knock).

Knock sense on these cars is done through the DIC and the spark plugs.

In order of cost:
Start with new spark plugs (must be NGK but cheap NGK copper BCPR6ES-11 or BCPR7ES-11 are fine) gapped correctly.

Then make sure you have a fresh tank of high octane gas.

Then there's the fuel system. If the car has the original fuel pump, it's time to change that out anyway. Do a new fuel filter at the same time, but honestly that's rarely a problem on these cars because it's the size of a coffee can.

Then check/replace the fuel pressure regulator.

For fuel system diagnosis, a good mechanic might be able to diagnose that pretty quickly by checking the pressure at the rail.

Finally replace the DIC.

After that I'm out of ideas.

This might be a case where a good Saab mechanic with access to a Tech 2 could figure it out pretty quickly.



posted by 24.6.4...
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