daveauth21

ok i checked my ecu for codes and this is what i got - 0702,0703,0302,0304,0504 ok should i just go ahead and change my knock sensor,egr valve,all oxygen sensors and possible 6 new coil packs(they where changed but where bought used) now the 0504 code says automatic transmission control unit signal to ecu what does that mean?

BigDogJonx

iTrader: (7)

There cant be that many things wrong with this car. Almost seems like the ecu is taking a crap. 504 code is when its not getting a signal from the TCM to the ECU.

But the knock sensor, oxygen sors and egr valve and coil packs cant be all bad.

Dixit

crewchief264

your tranny is fu***d up I would say go to a good tranny shop. however in past experience with my 4wd lifted jimmy automatics suck, and I havent gone to one tranny shop that can really give a damn about fixing your customized car. they'll take your money and then fix it under warranty a couple of times and call it quits, and blame it on your modifications and that you run it hard. to me it sounds like you probably have a some type of fuel problem stemmed from you probably trying to hammer it in an attempt to see if your fixes are working, however your messed up tranny could be the main problem????, if you've been running real rich your o2 sensors are probably just clogged and just need cleaned- i'd try that first. next make sure your not running rich, I plugged an air/fuel ratio gauge into the last o2 sensor and it reads really well,and tells me how it's running. it doesn't jump around much either. if your egr valve is stuck closed that could make you run slow cause it is sending hot exhaust back through to heat the intake charge up. chevys would get stuck alot and the best thing to do is just get rid of it, however on our maxes I wouldn't as the ck engine light would come on all the time, I would try cleaning the all the connection really well and the sensors themselves asl sometimed they just get correded, my friends thunderbird has 240,000 mi and his fast idle sensor got clogged up with carbon---a little cleaner and it was fixed for a while, it just wore out and needed replaced soon after.