oleskool Posted March 15 Share Posted March 15 I have had this happen randomly twice in the past and now two days in a row. 29 degrees this morning and yesterday morning when I went to start the truck up. It fires up but idles rough (sound wise) (RPM wise it is fine) and noticeably sounds like it is skipping a little when you rev the engine. After a few minutes I get a Loop Fault code on the REM and this morning I got Injector 2 and 4 fault as well. If I let it idle and warm up to roughly 150~ water temp and cycle the ignition it fires up normally and runs great the rest of the day. It appears the O2 sensor is cycling properly from 0-5V depending on the condition but I will try to reverify this. It also appears that the O2 heater circuit is working and is at 14V. Is it possible for the heater inside the O2 to burn out and if so is there a quick way to test it? Or would there be another issue I am missing here. It appears the engine wants to go into closed loop but cannot or will not do so when its cold. After it warms up or the outside temps increase to ~40 or 50F its fine. Thanks for all the assistance! Quote Link to comment Share on other sites More sharing options...
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