2.7 misfire

hi, i have a 2003 taco with 2.7L and have recently had some misfire on cylinder 1. i have replaced the coil pack, spark plugs (last summer), cleaned the fuel injectors myself and had them cleaned by a mechanic. yet it still misfires in cylinder 1.

it misfires while idling for a short period, while cruising at a constant speed, but when accelerating it stops. the wiring on the coil pack and fuel injector both have power. it gives me a P301 code. any suggestions?

 

Fuel pump going bad? Injector one is the last one on the fuel rail and poor fuel pressure would certainly cause it to be a problem.

Try swapping your injectors around and see if the problem moves. Make sure to have new injector seals on hand as yours are probably gonna fail when your remove the injectors to swap em.

Welcome to TW

 

maybe do a compression check

 

swap the coils to see if its the coil. comp check, swap injector, but maybe have your fuel rail inspected before that to ensure your fuel rail isnt clogged.

 

coill pack is brand new. compression is good according to mechanic. i will remove the coil pack tonight and see if it has ignition. if it doesn't any ideas to fix?

 

what is the cylinder # pattern?

 

valve clearance? unless if it uses automatic type.