xcmountain80

I got a pocket code reader and this is what I have line by line......

P300
P303
Mil On
Monitrs
2 Inc
Catalyst
Evap
5 Ready
Misfires
Fuel
Comp
02 Sensr
02 Htr

I think one of my coil packs or power packs (whatever they are called) are going as the truck runs like crap when cold. If I have to guess it would be the pack closest to the firewall. I have a spare packs and will replace all 3 tomorrow, I also have another 02 sensor assuming they are the same for the front on a 02 Tacoma. The rear O2 sensor might be going but it could also be the cat, I have a URD O2 sim on that so the #'s down stream are fixed. I assume if a coil pack was bad the mix could be wrong and then set the front O2 off, but gimme a hand please.

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xcmountain80

So no one had any insight on this?

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xcmountain80

I replaced Cylinder #2's coild with another one and still get weird readings on the OBII reader, though check engine lights go figure.

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xcmountain80

Aww SOB now it's cylinder #4, I went and bought new plugs and wire JIC this ends up being simple and cheap.

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Thelast83inNJ

PO300 is ramdon misfire. PO303 is cyl#3. P304 is cyl#4 etc etc. Plugs first, wires second or put your timing light on each wire it and see it flash tells you wire and/or coil pack ok. Cat efficiency code is P0420,most time cat is bad not O2. Your ready monitors say that all have run ok including heated o2s

xcmountain80

Awesome info had I read my manual that came with the code reader it might have told me that. I bought new plugs, wires and I Have some pre-owned coil packs. Will transfer tonight..............

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xcmountain80

So I might have found the problem..................




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xcmountain80

Anyone?