Sensors :: 1998 Chevy Cheyenne C1500 4.3L V6 - Codes P0420 And P0131
1998 Chevy C1500 4.3L V6 170,000 miles
My truck is stumbling and losing engine power sporadically. When this is happening I can usually drive it if I am real easy on the gas and slowly build up speed but if I mash it the engine will eventually just die completely. It has had this problem off and on for several years and now it's back with a vengeance. It always seemed to happen after a heavy rain but now I'm not sure.
Last week I had a mechanic look at the codes and he cleared them saying that once it happened again the code(s) that showed up would be a good indicator of the actual problem. The codes that were there were for a couple O2 sensors, catalytic converter and loss of vacuum I think. It happened again and his shop was closed so I got it read and cleared somewhere else and it was P0131 bank 1 sensor 1 and since I knew that one had come up before I went ahead and replaced it myself.
The next day the CEL came back on without any noticeable engine trouble. That was yesterday, this morning it rained and the problem is back and I went to get the code read and it was the P0420. There was also C0281 stop lamp circuit something or other that was new.
My gas mileage has stayed pretty good this whole time, always 15+mpg. Just wondering if my catalytic converter probably needs replaced, if I should replace other O2 sensors, or if this all might indicate something else in the engine.
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Got a weird one today. Everything was fine all day. Got the old girl smogged this afternoon and made one more quick stop. Got back on the freeway and up to speed and looked down. Speedo said I was 90? Yeah right. I was going with the flow.
So I plugged in my bluetooth ALDL dongle and fired up OBD Link. Well, OBD Link showed normal and accurate speeds. As did a second app on my phone for giving speed. So my VSS must be working correctly.
So my speedo is showing about 25 over actual. When the ignition if off the needle sits between 20 and 25. so did my speedo take a dump? Is there anything else I might try to see if it auto-calibrates?
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So, I repeated, but this time i just pushed very gently on the gas, getting up to between 5-10 mph before the car died again. At this point, it just stopped running completely. The engine would turn over, but would not keep running. When I got it into the shop, the mechanic said they put a fuel pressure gauge on there and the readings indicated that there was plenty of pressure, no problems the fuel pump or lines.
After further research, the mechanic said he thought it was an electrical problem, that it could be the crankshaft sensor or the ignition switch module, but he just did not really know for sure. I had him replace the crankshaft sensor, since it was the cheaper part, and it didn't fix the problem. So now I am just kind of stuck on what to do here.
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1996 Cheyenne 3/4 Ton 4x4 Long box
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Now I began to think... I can't just tap into the brake light wire at the rear bumper because the CHMSL will come on too when a signal light comes on. Do I have to run a CHMSL feed from the fuse box or somewhere up front, all the way down to the rear bumper? Where to locate this feed, or do I have to reference a schematic in the manual? Guess what? I don't have the manual.
While I was at it I installed a cargo light fixture inside the cap. I guess I could run that feed down from the front too while I am running the CHMSL wire.
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p0300
p0301
p0463
p1106
p1189
What happened to it since it was running just fine all yesterday and before...
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