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Old 04-10-2012, 02:41 PM   #1
hotford1970
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2000 L-Series 2.2L Sedan
Default 2000 Saturn LS 2.2l P0300 code

I have a 2000 LS with a 2.2L engine. Has anyone had problems with a misfire in cylinders #2 and #4? I have replaced all the plugs, the ignition module and the coil pack. I have also checked the fuel system and even went as far as checking the engine timing. It seems no matter what I do to try and fix it, nothing seems to work. Just looking for some fresh ideas on what to look for next, I have had this problem for about 2 months now. The car has about 112,000 miles on it, going down the road, it runs just fine with no problems at all. This problem only happens at idle in park or in gear at a light.

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Old 04-10-2012, 03:36 PM   #2
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Default Re: 2000 Saturn LS 2.2l P0300 code

What's your idea of "checking the fuel system"? If you didn't replace the fuel filter and/or used a fuel pressure gauge to measure actual pressure then you're guessing. Tried inspecting then swapping injectors around? And lastly, compression test? Wet and dry?

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Old 04-11-2012, 08:07 AM   #3
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Default Re: 2000 Saturn LS 2.2l P0300 code

I did check fuel pressure, its 55 psi. I also did the compression check, cyl#1 has 155 psi, #2 160, #3 175, and #4 170. I have also pulled the injectors and inspected them as well as swapped them around. According to the misfire data, cyl #2 and #4 and #1 show a misfire, cyl #2 has the highest count. The only code I get is a P0300. I'm kind of baffled because I can see misfires in a certain cyl, but I dont get a p0302 or any other code. I have also checked for vacuum leaks and I have replaced the intake and throttle body gaskets for good measure . Even after swapping the injectors, the misfires happen on the same cylinders.

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Old 04-11-2012, 10:17 AM   #4
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Default Re: 2000 Saturn LS 2.2l P0300 code

Well, you'll have to understand that one member said he "checked fuses" and after some more posts and misdirection, pulled and found a blown fuse. What isn't described clearly in these posts easily misleads anyone here. Posting numbers is removes all doubts.

Minimum compression is 180psi making your engine appear to be prematurely worn out. A wet (some oil added into each cylinder) compression test can help differentiate between worn piston rings or valves. Its unusual to see low numbers with only a little more than 100k miles and repeating the test again, dry then wet, may show higher pressures. If dry compression remains below 180psi then this may be the main cause of misfiring.

What condition were the old plugs when they were removed?

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Old 04-11-2012, 10:49 AM   #5
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Default Re: 2000 Saturn LS 2.2l P0300 code

I can totally understand when it comes to providing detailed info, kind of like diagnosing a noise over the phone, lol. So minimum compression is 180? I checked with alldata and they were a little vague on the minimum spec, something to the effect of no less than 70% of the highest reading and not below 100 psi. The old plugs were worn, but they didn't seem to be terribly bad. I didn't really see any oil fouling or excessive amounts of carbon build up.

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Old 04-11-2012, 11:41 AM   #6
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Default Re: 2000 Saturn LS 2.2l P0300 code

The vague compression description is most likely the explanation of no more than 5-15%(?) variation from the lowest to the highest as a quality issue.

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