P0430 Error Code

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Thread: P0430 Error Code

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    Default P0430 Error Code

    Hi Guys,
    I have a 2001Tundra 4x4 Access Cab 4.7l. It has high mileage (225k), but, has run great since I bought it about 10,000 miles ago. Last week I drove to Albuquerque, a 1600 mile trip one-way, I loaded a small trailer and towed it back home. About halfway back the truck began missing when it was put under any strain, the check engine light came on and flashed when it was actually missing, but I continued on. When I got home I went to Auto Zone and they said it was reading multiple misfires on cylinders 5 and 7. I replaced the spark plugs, which needed to be done badly, and reset the code. It ran great for about 60 miles when the check engine light came on again, it then started to miss again when accelerating lightly at speed. Went back to Auto Zone and this time it was a P0430 code. Any ideas on what to do next that I can try myself? Thanks in advance.

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    Rookie Rolilk's Avatar
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    Default Re: P0430 Error Code

    Sounds like the coil not the plugs. This has happend to me and with all new plugs in, it was the coil. If you do need new plugs use the denso's the truck came with, the 4.7 seems to love them the best. Just find out what number cyl is misfireing and swap out that coil. Give it a try and see if the misfire is now on a different cyl to confirm bad coil. Good luck!

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    Default Re: P0430 Error Code

    Thanks, I pretty much had come to that conclusion. I think the P0430 error code is independent of the misfiring and probably has to do with the O2 sensors. Now, I have three options on replacement of the coils, I could buy some aftermarket ones on-line for about $20ea, get some used ones at a local salvage lot for $25ea (Denso I think), or get Denso for about $75ea. I'm sure the Denso are better, but I could replace all 8 for the cost of replacing two OEM coils, I think two are bad. So what is the best route here

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    Default Re: P0430 Error Code

    OEM, even from the junk yard are better than aftermarket.
    All you Baja lovers check out: http://www.MasOlas.com


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    Default Re: P0430 Error Code

    Did you swap coils yet? No use replacing coils if the misfire doesn't follow the coil location.

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    Default Re: P0430 Error Code

    Thanks, I was leary of the cheap ignition coils online, I'm going to try the ones from the salvage yard tomorrow and see what happens. The check engine light has turned off now but still getting the occasional misfire, not nearly as bad since I changed the plugs though.
    I have gotten the P0430 code intermittently for a while now, after having read alot on this forum the last couple of days, if I can get the misfiring fixed, I'm going to try the acid wash on my catalytic converters. I just joined this forum a few days ago, and want to say what a tremendous resource this is. I love my Tundra and want to keep it running great for years to come!

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    Default Re: P0430 Error Code

    Yes...the best thing to try is the acid wash. It's cheap and easy compared to the other alternatives. Just make sure you git yer seals before you start and soak those fasteners with penetrating oil ahead of time.

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