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Hey guys,
About a month ago, out of nowhere when I started my truck (97 3.0 Ranger) it started stumbling/misfiring and then stalled out on me about 30 seconds after running. When I tried to start it back up, it would start after longer than normal cranking and run for a very short period of time, misfiring and stumbling until it would stall out. After a few tries then it would not start at all. I scanned to see if it set any check engine lights, and there were no new ones. (I've had a P1443 (evap) and a P0175 (running rich) for a while that I haven't been able to fix yet but I haven't had any issues for as long as I've had those codes until now). I tried several times spraying starting fluid into the intake to determine if it was a fuel issue, but it made zero difference. Also, I replaced the fuel pump about 30k miles ago so it shouldn't be failing. After letting the truck sit for a few hours, I tried one more time and after a rough start, it quickly smoothed out and acted like nothing had happened. I drove it for another month with no problems, but then again this happened to me.
However, this time it acted a little different. It did stumble and die out, but it took way longer for it to happen and I was able to keep it running for probably 30 seconds misfiring and stumbling before it just finally would quit. I could keep getting it to start up and run normal for a short period of time, then it would repeat the stumbling and dying process. Again though, there were no new check engine lights. I really thought that having it misfiring and running so bad for an extended period of time should have at least thrown a misfire code, but to my surprise, still no new codes.
It's hard to diagnose this issue because it is intermittent, but I have a few suspicions. I'm guessing it's possibly the camshaft or crankshaft position sensor failing, or possibly the coil pack starting to fail. But, the fact that it's not throwing a misfire code after running like that for a long period of time is making me concerned that the ECU could be on its way out. What I'm wondering is, does anyone have information on how I can test the cam & crank sensors, the coil pack and the ECU? I haven't been able to find any voltage and/or resistance values for testing those sensors and circuits in my searches. Or, does anyone have any insight into what else could be causing the issue?
I know I should fix the other two codes that I have as well, but I don't believe either of those are causing this issue. I did try to fix the P1443 code, but didn't have any luck after basically going through the entire EVAP system. I also did have a P0172 code a long time ago that I was able to fix by replacing the intake manifold gaskets, so I'm surprised I now have a P0175 code for running rich on the other bank, but haven't been able to diagnose the issue yet.
You might want to change your idle control valveHey guys,
About a month ago, out of nowhere when I started my truck (97 3.0 Ranger) it started stumbling/misfiring and then stalled out on me about 30 seconds after running. When I tried to start it back up, it would start after longer than normal cranking and run for a very short period of time, misfiring and stumbling until it would stall out. After a few tries then it would not start at all. I scanned to see if it set any check engine lights, and there were no new ones. (I've had a P1443 (evap) and a P0175 (running rich) for a while that I haven't been able to fix yet but I haven't had any issues for as long as I've had those codes until now). I tried several times spraying starting fluid into the intake to determine if it was a fuel issue, but it made zero difference. Also, I replaced the fuel pump about 30k miles ago so it shouldn't be failing. After letting the truck sit for a few hours, I tried one more time and after a rough start, it quickly smoothed out and acted like nothing had happened. I drove it for another month with no problems, but then again this happened to me.
However, this time it acted a little different. It did stumble and die out, but it took way longer for it to happen and I was able to keep it running for probably 30 seconds misfiring and stumbling before it just finally would quit. I could keep getting it to start up and run normal for a short period of time, then it would repeat the stumbling and dying process. Again though, there were no new check engine lights. I really thought that having it misfiring and running so bad for an extended period of time should have at least thrown a misfire code, but to my surprise, still no new codes.
It's hard to diagnose this issue because it is intermittent, but I have a few suspicions. I'm guessing it's possibly the camshaft or crankshaft position sensor failing, or possibly the coil pack starting to fail. But, the fact that it's not throwing a misfire code after running like that for a long period of time is making me concerned that the ECU could be on its way out. What I'm wondering is, does anyone have information on how I can test the cam & crank sensors, the coil pack and the ECU? I haven't been able to find any voltage and/or resistance values for testing those sensors and circuits in my searches. Or, does anyone have any insight into what else could be causing the issue?
I know I should fix the other two codes that I have as well, but I don't believe either of those are causing this issue. I did try to fix the P1443 code, but didn't have any luck after basically going through the entire EVAP system. I also did have a P0172 code a long time ago that I was able to fix by replacing the intake manifold gaskets, so I'm surprised I now have a P0175 code for running rich on the other bank, but haven't been able to diagnose the issue yet.
I had already tried that at some point during the time I had been dealing with this issue with no change. Thank you though.You might want to change your idle control valve