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So I have a 2004 Saab 9-3 linear and and I'm no stranger to the P0300 misfire codes. I just changed the oil and filter, and spark plugs (NGK iridium). But my engine is still running rough at idle and my check engine light begins blinking after only a few seconds of running. Which (sputtering, flashing CEL) used to only happen around 5th gear when you give it some hard throttle.

I've read about the coil packs and tested the spark and changed different combos of coil pack and cylinder, and Leaving the coil on the plug and unplugging the wire harness to find cylinder #1 is the only one that doesn't change how bad the engine is running. So I buy a new coil pack for #1 and get it all hooked up only to find nothing has changed. The pack, when unplugged from the wire harness, doesn't change just like before. All of the other coil packs are arcing to the top of the coil when I pull them out (not nearly as bad as coil 1 which had scorched electric marks) but don't change when I disconect the wire harness. (Dielectric maybe?)

Can anyone shed some light on my situation? maybe Fuel injector for cylinder 1?

Please help!!!
 

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Did the actual coil have Saab and Mistubishi stamped on it?
 

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Check the T valve and line next to the oil dipstick for cracks.
 

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So I have a 2004 Saab 9-3 linear and and I'm no stranger to the P0300 misfire codes. I just changed the oil and filter, and spark plugs (NGK iridium). But my engine is still running rough at idle and my check engine light begins blinking after only a few seconds of running. Which (sputtering, flashing CEL) used to only happen around 5th gear when you give it some hard throttle.

I've read about the coil packs and tested the spark and changed different combos of coil pack and cylinder, and Leaving the coil on the plug and unplugging the wire harness to find cylinder #1 is the only one that doesn't change how bad the engine is running. So I buy a new coil pack for #1 and get it all hooked up only to find nothing has changed. The pack, when unplugged from the wire harness, doesn't change just like before. All of the other coil packs are arcing to the top of the coil when I pull them out (not nearly as bad as coil 1 which had scorched electric marks) but don't change when I disconect the wire harness. (Dielectric maybe?)

Can anyone shed some light on my situation? maybe Fuel injector for cylinder 1?

Please help!!!
Hi! I had the same problem and a herd of "specialists" had spent many hours trying to figure out what's going on. Then, after spending lots of money on things and fixes like those you'd tried, I found on YouTube a short clip recorded by the SAAB technician who pointed out that the misfiring of the cylinders may be due to the use of the low-octane gas. Turns out the 2.0T engine should run exclusively on 93 octane gas or higher. After switching to a higher grade gas the problem's disappeared and I enjoy a peace of mind since last November !!!!
 

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Rule #1 with our Saabs (aside from getting a Tech 2) is to run highest available octane fuel. Note on the linked map below that 93 octane is generally available only in the flatlands (< 2000' ASL). 91 octane is more than sufficient for a healthy motor.

Find 93 Octane Gas: Locate Gasoline Stations Selling Premium
 

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Perhaps 91 octane is fine, but when looking at the bottom of the gas filler cap of my SAAB there is a clear info: use 93 octane or higher only. BTW, the guy on YouTube video explains why and how a lower octane gas affects cylinder's function. But of course, I do not pretend to know or understand much about all this. I just shared my personal experience with the issue in question, that's all.
 

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And so did I, that there are places it is unavailable, like the US west, and 91 is the highest grade sold. FWIW, my gas cap says min. 87 octane. Do you have a tune or something?
 

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Hi! I had the same problem and a herd of "specialists" had spent many hours trying to figure out what's going on. Then, after spending lots of money on things and fixes like those you'd tried, I found on YouTube a short clip recorded by the SAAB technician who pointed out that the misfiring of the cylinders may be due to the use of the low-octane gas. Turns out the 2.0T engine should run exclusively on 93 octane gas or higher. After switching to a higher grade gas the problem's disappeared and I enjoy a peace of mind since last November !!!!
He was last seen in 2015.
 

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Damn, sucked in by a delayed zombie thread! 🤣

That'll teach me to look at last post only. 👍
 

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And so did I, that there are places it is unavailable, like the US west, and 91 is the highest grade sold. FWIW, my gas cap says min. 87 octane. Do you have a tune or something?
I'm just telling what I see in "my" cap. My SAAB is 2004 9.3 2.0T. convertible.
 

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Ya, you would have problems out here unless you brought your own fuel, or shopped at airports.

EDIT: Even airports wouldn't work. They are sill trying to develop an unleaded alternative to 100 octane leaded avgas. Best available is 96. That leaves, what, E15-25 and up?

EDIT2: octane ratings vary; see below.
 

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Mine came with hirsch upgrade and has a label that says 98.
Ya, I see you have 95 and 98 RON available to you. Here fuel octane is rated by (RON + MON)/2, called AKI (anti-knock index), and is 4-6 less than RON for the same fuel. So you would need 93 octane in US.
 

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I haven’t looked at my cap in ages but wonder if the vert cap is meant 93ron. Which is about 87US. They were built in Austria, so who knows what they were doing. heck, could say the same about trollhatten. also, not all 91 is the same. 91acn in out west is awful. western canada 94 is almost worse than that. some 93 has worse knock prevention than others. shouldnt be an issue on a stock car though.
 

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I had the same problem first I change the vacuum purge canister didn't change the spark plugs only to find out I had a crack holes in the vacuum leak line
 
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