metal4life
Member
- Joined
- December 22, 2011
- Messages
- 20
- Reaction score
- 0
- City, State
- Idaho
- Year, Model & Trim Level
- 1996 Ford Explorer Sport
Hello everybody, I'm new to this site as I just bought an old '96 and need some advice/suggestions...she's got a ton of miles, and an engine rebuild is definitely in her future next summer, but for now, I have a few DTCs that stand in the way of a decently smooth running engine.
When I bought it, it had 197,000 miles on the old OHV 4.0. But the previous owner DEFINITELY took care of it as the engine bay is spotless and mostly mechanically sound. Anyways, I was told it had failed emissions test and that codes P0133 and P0304 were responsible...ok...I drove it home and it definitely runs rough and noisy at highway RPM, and noticeably down on power(I think). It's also stalled a few times at lights when I'd slow down and disengage the clutch...
I recently took it to Autozone to scan it myself as a project baseline so to speak, and suddenly the misfire code was gone, and it just said bank 1 was running lean....ok...I took it back today and plugged it in, and it just says that O2 sensor 1, bank 1 code again, nothing else.
So I'm gonna pull that sensor anyway, but my question is, would a bad O2 sensor cause a misfire code? As well as that kind of effect on the engine? The prior owner said all the plugs and wires had been replaced to no effect...however she did mention that she happened to get some bad gas in it at one point, though I personally don't think it's related...
Or is perhaps the misfire the true cause and the sensor was the first component to rat it out? Seems unlikely since the misfire code is gone now...
I'm also going to try and clean/replace the MAF sensor as I've read it is a common cause of issues...but I'd love to get some expertise on this from someone who's had similar problems...
When I bought it, it had 197,000 miles on the old OHV 4.0. But the previous owner DEFINITELY took care of it as the engine bay is spotless and mostly mechanically sound. Anyways, I was told it had failed emissions test and that codes P0133 and P0304 were responsible...ok...I drove it home and it definitely runs rough and noisy at highway RPM, and noticeably down on power(I think). It's also stalled a few times at lights when I'd slow down and disengage the clutch...
I recently took it to Autozone to scan it myself as a project baseline so to speak, and suddenly the misfire code was gone, and it just said bank 1 was running lean....ok...I took it back today and plugged it in, and it just says that O2 sensor 1, bank 1 code again, nothing else.
So I'm gonna pull that sensor anyway, but my question is, would a bad O2 sensor cause a misfire code? As well as that kind of effect on the engine? The prior owner said all the plugs and wires had been replaced to no effect...however she did mention that she happened to get some bad gas in it at one point, though I personally don't think it's related...
Or is perhaps the misfire the true cause and the sensor was the first component to rat it out? Seems unlikely since the misfire code is gone now...
I'm also going to try and clean/replace the MAF sensor as I've read it is a common cause of issues...but I'd love to get some expertise on this from someone who's had similar problems...