Join Date: Aug 2007
Location: atwater, cali.
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Another code, p0300, and p0303. Need help, what should i do next?
I think i've researched just about every thread on here but thought i should still post. Here's what i got:
p0303-misfire, #3 cylander.
98 tac. 2.7 4x4, all stock.
265,000 miles, but runs like a champ. Doesnt burn a drop of oil
Trucks been perfect but about a month ago i noticed it kind of started idleing just a tad rough. Passengers never noticed it but i did. Than all of a sudden it throws the codes mentioned above. Just had the battery changed because a guy at walmart said i needed a battery because the truck took about 1.5 seconds to start after turning the ignition. Changed, started exactly the same. So i started working on the check engine light. This is what i have so far.
Changed the oil, spark plugs, wires and thought the coil might be throwing the code, changed it, not it.
Every fluid has always been changed. Radiator, perfectly clear green. Gas filter changed 1.5 years ago.
No visible smoke coming out of the exhaust, but the pipe does have carbon build up.
Spark plugs have a light kind of a brownish tint on parts of them now, changed about two weeks ago. Thats normal right? NGK plugs that are recommended in the hanes manuel. Gapped according to hanes manual. THe ones prior were sorry bosh's that the truck ate up pretty good. I installed them last summer but i do commute. Probably put about 25,000 miles on them.
After all this, cleared the code again, and it came back next day.
On the bad side:
I decided to check the air filter, dusty as hell. Am going to buy one tomorrow. I cleared most of the dust off and put it back in and cleared the code. Just curious, drove it, light came on after about 10 min.s. I've never ran a cleaner through it or taken it into toyota or anybody for any type of services. I do them myself. The motor has never been opened up and always ran perfect. The only things that have been changed that havent been mentioned are the starter. This week i am going to run sea foam through it,gas,pvc tube and booster cable hose. After this, i just dont know what else to do? Any insights before i move onto the fuel injectors and motor????????????
Last edited by jaime7818; 08-12-2007 at 11:24 PM.