Hey guys I work at a local repair shop in Waterloo, Il I have a diagnostics tech telling me I need to replace all 4 of my injectors & reprogram due to a TSB I have 2 of the 3 engine codes on and we can watch cyl. 4 misfire lots on idle approx. 1000 times in a 5 min span. so we ran the injector balance check and all came up ok. What do you guys think about this? I don't feel like dropping 300 bucks on a guess HELP!

 

misfire sounds like a coilpack

 

one is a random misfire code P0300 and the other P1174 is Fuel trim cyl. Balance B1

 

sounds like an out of wack tune then

 

I'm going to move the #4 coil to the #1 coil and check that to make sure its not a coil

 

Check for vacum leaks

 

Well I switched the coils over and still the same so I took the plugs out and check them and switched them and still the same...I'm running out of options looks like my tech is getting his guess right so far

 

If your p300 code is indicating which cylinder is misfiring, change the coordinating fuel injector. I had both these codes on mine, with a p301, I changed the cylinder 1 fuel injector and no more problems.