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1998 Chevy problems

1K views 4 replies 3 participants last post by  Phildirt 
#1 ·
Hello everybody I'm am new to these forum, I'm in desperate need of knowledge, so I have a 1998 Chevy Silverado k1500 5.7l..I've had a running lean code pop up in bank 2, also random misfire I've have dumped so much money into this truck to keep her running but now I'm stuck.My truck has been idleing rough when it warms up. I've have replaced the fuel injectors, fuel filter,fuel pump, spark plug and wires, cap and rotor are less than 2 years old. Cleaned the throttle body and iac valve, checked egr it's not stuck. I've sprayed carb cleaner on vacuum lines and intake for leaks.. i tool a multi meter to my o2 sensors I took the prongs to both hot(black) wires it measured good, on the second o2 sensor i took the prongs to the Black wires I didn't get a reading but I tried the other 2 white wires and I got a reading.. if any of you can help and point me in a direction I would really appreciate it. Thankyou
 
#2 ·
My guess out of the gate would be the O2 sensors.

Is it possible you have a bad exhaust leak where the manifolds meet the y-pipe? That could mess with things as well.

Also, did you replace your ignition parts with AC Delco stuff? Prior experience with a Vortec 4.3 and 5.7 has taught me that they hate anything but the OEM parts and/or NGK plugs (which I think NGK makes the Delco plugs for those applications anyway).
 
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