Capt301Ret
Newbie
Hi. I have a 98 K2500 with the 5.7. I pull a travel trailer around the country.
Recently the truck started running lean above 3500. First noticed it on a long steady pull up and over a pass. Pedal was floored, in second at around 4K. After the hill, I exited the highway, downhill and it continued to run lean (pooping through exhaust, no power, running rough). Even coming off an idle, truck just wouldn't go. Pulled over, shut it off. Let it sit for a few, then went on my way like normal.
It did this for the rest of the trip, every hill across I-10E in Texas!!
Once I got settled, I starting looking in to things. Here's what I found. Regardless of load, if I went above 3500rpm, it would start to **** all over itself. Both banks LTFT show 9.38 (it rarely will change). STFT stays at 0, and both sensor 1's show 0 volts. If I let off the gas, I would see voltage on both O2 sensors, but 0 STFT. In order to get out of this mode, I have to shut the engine off for a couple of minutes. No amount normal driving will clear it. I've seen lean bank codes, and will have a P0131 and P0151 codes during this time. The EGR code is because I disconnected it to see if it was causing the lean out.
Is this a PCM problem or something putting it in some type of mode?
Thanks!
Recently the truck started running lean above 3500. First noticed it on a long steady pull up and over a pass. Pedal was floored, in second at around 4K. After the hill, I exited the highway, downhill and it continued to run lean (pooping through exhaust, no power, running rough). Even coming off an idle, truck just wouldn't go. Pulled over, shut it off. Let it sit for a few, then went on my way like normal.
It did this for the rest of the trip, every hill across I-10E in Texas!!
Once I got settled, I starting looking in to things. Here's what I found. Regardless of load, if I went above 3500rpm, it would start to **** all over itself. Both banks LTFT show 9.38 (it rarely will change). STFT stays at 0, and both sensor 1's show 0 volts. If I let off the gas, I would see voltage on both O2 sensors, but 0 STFT. In order to get out of this mode, I have to shut the engine off for a couple of minutes. No amount normal driving will clear it. I've seen lean bank codes, and will have a P0131 and P0151 codes during this time. The EGR code is because I disconnected it to see if it was causing the lean out.
Is this a PCM problem or something putting it in some type of mode?
Thanks!
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