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Old 01-10-2019, 09:08 PM   #1
merovie
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Default P0300 code. 2006 Saturn Ion 2.2

So I got a P0300 code on my Ion. It was driving fine. Went to work and back. (Which is 30 miles total) I parked it, went inside my house to grab my gym bag to go work out, and suddenly out of the blue the engine light started flashing and car was driving terribly. Went immediately back home. My mechanic said to replace the coil pack first.

Thing is, last time he was over to fix something, (to replace the starter) he said I might have a leak in my head gasket from the exhaust smell. But i am assuming it's a really small one if there is because it took five months for the coolant in the reservoir to go all the way down. Engine has never run hot so the coolant has always worked fine as far as keeping the engine from overheating. Pretty sure I can fix something like that with some Blue Devil or Steel Seal or something. Fixed my Mazda Protege (which WAS overheating) that way and it had a pretty bad blown head gasket. I know a P0302 code would mean a plug or wire or fuel injector in cylinder 2 is probably the problem.

So basically, if the coil pack (or more specifically the ignition module) doesn't fix the problem (cos I find it hard to believe two or three fuel injectors could go bad at the same time) and the Ion was running perfectly literally two minutes before I went back out to go to the gym what do you guys think it could be? It does have a lot of miles on it (177,000) which makes me wonder "how far was the previous lady was driving it?" My 96 Mazda Protege had 235,000 miles on it before it finally bit the dust.

I guess my question is: what is the worst case scenario?

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Old 01-11-2019, 03:46 AM   #2
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Default Re: P0300 code. 2006 Saturn Ion 2.2

Worse case scenario is a broken engine, mechanically. Best case? Worn out spark plugs never replaced. It wouldn't hurt to remove them for examination and replace them first. If misfiring remains on good old or new plugs, there's a choice - either coil pack or ignition control module (the small aluminum box with fins sitting to one side of the coil pack). Most ignition issues seem to be about faulty ignition control modules on 2.2L engines used in several GM models. My scientific wild ass guess is ther icm sits on engines heat cycling all year long and may suffer from heat exhaustion as hot summers cook them while subzero temps freeze 'em. A true test of thermal capabilities to withstand the wide temperature range. Coil packs seem to hold up better. You can search threads about 2.2L engines with icm failures.

To be sure this is an ignition issue, several starting attempts without the engine firing up should flood all cylinders with fuel. Removing plugs and checking each one for fuel would verify injectors are operating along with the fuel pump pressurizing and supplying fuel to injectors with the ecm pulsing each injector.

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Old 01-12-2019, 10:51 PM   #3
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Default Re: P0300 code. 2006 Saturn Ion 2.2

The thing is, the engine does fire up. But the whole engine shakes and you can obviously tell it is misfiring. I could probably go out there right now and turn the key in the ignition and it will start. I could probably drive it to the corner store two blocks away, but it would drive like crud.

When I first was going to the gym the car wouldn't start, it refused to fire up, but I turned the key a few more times and it did. I guess what you're saying is I should have checked the cylinders THEN.

But after it started I drove about a quarter mile and realized there was something really wrong with the car, engine light flashing, etc, so I turned right back around and drove it home, where it has stayed. My mechanic came over with the OBD reader and got the P0300 code. It is at his advice that I have ordered a new coil pack (module and ignition coil) And of course I am going to put in new plugs.

I am just glad I didn't fry the catalytic converter.

If it is the timing chain, I am just gonna have him replace the head gasket, timing chain, and water pump all at the same time.

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Old 01-13-2019, 10:45 PM   #4
19boneatock88
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2006 ION-2 Quad Coupe
Default Re: P0300 code. 2006 Saturn Ion 2.2

The misfire is more likely an ICM/coil pack than anything... these cars done usually count the misfires individually but if it could you’d likely be missing on either 1 and 4 or 2 and 3... a dealer level tool can read the misfire counters and see if this is the case...

...
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L61/F23(M86), 139k...
Too many mods to list in sig...

“Stock” is nowhere in my vocabulary...

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Old 01-14-2019, 03:01 PM   #5
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Default Re: P0300 code. 2006 Saturn Ion 2.2

My mechanic had a high-end OBD reader so maybe he knew exactly what it was. I didn't actually see the reading. I know the ones at autozone ONLY show the code. The higher-end ones show the code and probable cause.

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Old 01-14-2019, 03:12 PM   #6
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Default Re: P0300 code. 2006 Saturn Ion 2.2

Generic low cost readers are fine. Without translating error codes, all one has to do is plug in the error code and Google it. Many dedicated sites provide definitions so anyone can compare definitions with other places and not misled.

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