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Codes: P0301, P0302, P0303, P300, P1399 help

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Old 03-20-2017, 07:19 PM   #101
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Default Re: Codes: P0301, P0302, P0303, P300, P1399 help

I searched a lot of threads to find my specific problem, so i apologize if this has been asked already. Just purchased a used 2001 Prelude base 5 speed. Test drove it a ton of times with no issues. Of course, on the way home the CEL comes on. My problem though seems different than some of the others I've seen on here. A lot of people are having this issue at idle. Mine only occurs under hard acceleration in 3rd, 4th, and 5th gear. sometimes it blinks and goes off. sometimes it blinks and stays on. OBD2 comes up with P0300, P0301, P0303, and P1399. I'm just looking for advice on where to start since the CEL only comes on under load when the gear ratio gets closer to 1:1. Used to do a lot of my own repairs, but I admit I'm very out of practice. Would not injectors, fuel pump, of fuel filter require the same demand in every gear? Does premium unleaded actually make that much of a difference in these engines? Still on first tank of regular, but still have half a tank left. The car sat for quite a while before we purchased it.
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Old 03-21-2017, 07:27 AM   #102
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Default Re: Codes: P0301, P0302, P0303, P300, P1399 help

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Originally Posted by regierd View Post
I searched a lot of threads to find my specific problem, so i apologize if this has been asked already. Just purchased a used 2001 Prelude base 5 speed. Test drove it a ton of times with no issues. Of course, on the way home the CEL comes on. My problem though seems different than some of the others I've seen on here. A lot of people are having this issue at idle. Mine only occurs under hard acceleration in 3rd, 4th, and 5th gear. sometimes it blinks and goes off. sometimes it blinks and stays on. OBD2 comes up with P0300, P0301, P0303, and P1399. I'm just looking for advice on where to start since the CEL only comes on under load when the gear ratio gets closer to 1:1. Used to do a lot of my own repairs, but I admit I'm very out of practice. Would not injectors, fuel pump, of fuel filter require the same demand in every gear? Does premium unleaded actually make that much of a difference in these engines? Still on first tank of regular, but still have half a tank left. The car sat for quite a while before we purchased it.
Sounds like you're on the same tank of fuel the car was stored with. I would definitely run that tank as dry as you can to get the old gas out and fill it with fresh fuel. Run at least a tank of fresh fuel through before you do much else. Your symptoms might just be a result of old, bad gas and might go away with fresh fuel.

If the car has been sitting you should consider a new air filter, spark plugs, and plug wires to get those out of the way. If the problem persists after a tank of fresh fuel, you could clean or replace the fuel injectors and EGR valve to start.

Hope this helps;
ck
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Old 03-23-2017, 10:08 PM   #103
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Default Re: Codes: P0301, P0302, P0303, P300, P1399 help

I've personally had a spark plug fail, in a matter of months in my Integra. That was a platinum plug. Since then I use the OEM recommended NGK copper plugs. (On the label under the hood, one for normal operation, another for constant high speed (hot plug) driving. It wouldn't be strange to assume the plugs could be crap if you're running the crummy fuel out of the tank. Personally, I prefer 91 octane or higher without ethanol in my 92, but newer cars are designed for ethanol. I feel it runs much smoother and more responsive on premium fuel. Once you get that bad fuel out reset your ecu/ clear your codes, put in some new OEM plugs, get to operating temp, check your ignition timing. Hopefully you'll be good after that!
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0301, 2001, 2004, accord, civic, code, honda, misfire, multiple, p0300, p0301, p0302, p0304, p1399, prelude

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