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Old 02-19-2014, 12:02 AM   #1
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Default P300 again :(

Hi all, a couple of weeks I posted about a P300 code I had and it looked like I fixed the problem....but it just happened again tonight. I got P300 and P300 P. Although it wasn't as bad, it still stumbled. The symptoms today were, I was at Frys and I started my car and it took a while and it felt as if it was going to die but eventually it started fine. But when I drove it started stumbling. The RPM meter was fluctuating a lot at the stop light but it was just one. The rest of the stop lights were just fine. And I got home and everything seemed normal. I replaced the UIM/LIM gaskets already and it did seem like it solved the problem.

What I did do yesterday was clean the throttle body with cleaner and I cleaned the idle air control valve with the cleaner. Did I do something wrong? Idk but what else can be the problem?
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Old 02-19-2014, 07:13 AM   #2
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was it after or before you cleaned it
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Old 02-19-2014, 10:45 AM   #3
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was it after or before you cleaned it
After I cleaned it. I used the throttle bottle cleaner and it actually felt a lot smoother when I drove it. It started idling a lot smoother and it drove smoother on the highway. But the problem was when I went from store to store and at the last stop when I started the car it sort of hesitated and then the misfire check engine light flashed again.

Looks like I made a big typo, the code is P0300 and I also get a P0300 P. I also still have the P0171 and P0171 P. I hate these codes so much.
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Old 02-19-2014, 11:32 AM   #4
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if its lean and misfiring there is air getting in after the maf. maybe the iac is not sealed or there is some other gasket that is leaking
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Old 02-19-2014, 11:50 AM   #5
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if its lean and misfiring there is air getting in after the maf. maybe the iac is not sealed or there is some other gasket that is leaking
Could the little o-ring be the problem? When I took it off, I noticed it slipped and it wasn't "snapping" back on. But I put it back on thinking nothing of it. I might have to replace the IAC because it looked awfully old. But would a faulty IAC cause the random misfires?
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Old 02-19-2014, 03:25 PM   #6
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it could. i would make sure the iac is air tight first then see what you have from there
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