This isn't on my truck but on Kyles truck. It's also a 98 with the 4.0l. But he's been having a really rough idle that shakes the whole truck for close to 4 months now. And he keeps throwing parts at it. It's got new spark plugs, wires, IAC, MAF, Intake Gasket, EGR and the downstream O2 Sensor. Now most of that stuff it was throwing codes for. But now it's not throwing any codes any more and the rough idle continues. So I hooked up my scan gauge to it and to mine to compare what the readings on everything were and the Fuel trim on his was way richer than mine.
My readings are:
Bank 1 Long Term - 8.95%
Bank 1 Sensor 1 - 0% - 5.78%
Bank 1 Short Term - 0% - 3.91%
Bank 2 Long Term - 12.5%
Bank 2 Sensor 1 - -3.12% - 0%
Bank 2 Short Term - -2.34% - 2.34%
His readings were:
Bank 1 Long Term - 0%
Bank 1 Sensor 1 - 29.61% - 38.12%
Bank 1 Short Term - 35.94%
Bank 2 Long Term - 0%
Bank 2 Sensor 1 - 32.01%
Bank 2 Short Term - 11.01% - 16.41%
Not really sure where to go from here with it. He's tired of putting money into it and now there's no codes to go off of anymore.
Edit: Forgot to mention that it idles fine when it's in open loop. It's when it goes into closed loop is when it starts to idle really bad.
My readings are:
Bank 1 Long Term - 8.95%
Bank 1 Sensor 1 - 0% - 5.78%
Bank 1 Short Term - 0% - 3.91%
Bank 2 Long Term - 12.5%
Bank 2 Sensor 1 - -3.12% - 0%
Bank 2 Short Term - -2.34% - 2.34%
His readings were:
Bank 1 Long Term - 0%
Bank 1 Sensor 1 - 29.61% - 38.12%
Bank 1 Short Term - 35.94%
Bank 2 Long Term - 0%
Bank 2 Sensor 1 - 32.01%
Bank 2 Short Term - 11.01% - 16.41%
Not really sure where to go from here with it. He's tired of putting money into it and now there's no codes to go off of anymore.
Edit: Forgot to mention that it idles fine when it's in open loop. It's when it goes into closed loop is when it starts to idle really bad.