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What else could cause P0302? Misfire help

Old 09-27-2012, 09:42 PM
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What else could cause P0302? Misfire help

The car feels weak above 5k and backfires when I abruptly let off the accelerator. Below 5k, it's perfect. It's throwing P0302 though. I've already replaced the coils, plugs, wires, cleaned ESS, MAF, and IAT. I also have a rattling CAT that I will be replacing (it's not blocked yet, I removed it to check), but I want to fix this misfire first. I had a stuck intake runner valve that was recently fixed, and that code is gone now (thank god). This leaves me with P0302 and P0420 (the cat). What else could cause P0302 besiides the fuel pump?

Thanks y'all
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Old 09-28-2012, 03:54 AM
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Fuel injector, blown engine
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Old 09-28-2012, 06:11 AM
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Originally Posted by MaD666MaX View Post
Fuel injector, blown engine
I don't think it's the engine, because it runs great below 5k and doesn't have starting issues
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Old 09-28-2012, 04:25 PM
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Seems like you've knocked off the usual suspects.
Not sure if it will help, but check this thread https://www.rx8club.com/tech-garage-...t-here-222280/

Have you actually verified that your engine is healthy? Compression test could help, if all else fails
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Old 09-28-2012, 06:35 PM
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No I haven't. Dealer wants $120 to do it and from what I understand, compression issues begin in lower RPMs first and my lower RPMs are flawless. I will have the fuel pressure tested soon though. And yeah, I know that thread practically by heart :/
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