Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
My wife and I have a 2001 ford explorer 4.0 sohc with a p0171 code and I believe that's bank 1. I have already replaced the upper and lower intake gaskets. I now hear what sounds like an exhaust leak. Can a exhaust leak cause a lean code?
Hey Jay! Any chance you can look at scan data? Knowing what the O2 sensors and fuel trims are doing at different loads would go a long way towards diagnosing this code.
I think it's also worth saying that just because you have a bank one code, doesn't mean bank two is A-OK. It sometimes works out that both banks are running lean, but one bank happens to set a code before the other. Again, looking at fuel trims would help here.
Like Paul said, exhaust leaks are definitely a potential source of fuel trim issues. Just don't go nitpicking your exhaust too much - it's my experience that exhaust leaks needs to be pretty large in order to set lean codes.
Tyler wrote: Hey Jay! Any chance you can look at scan data? Knowing what the O2 sensors and fuel trims are doing at different loads would go a long way towards diagnosing this code.
I think it's also worth saying that just because you have a bank one code, doesn't mean bank two is A-OK. It sometimes works out that both banks are running lean, but one bank happens to set a code before the other. Again, looking at fuel trims would help here.
Like Paul said, exhaust leaks are definitely a potential source of fuel trim issues. Just don't go nitpicking your exhaust too much - it's my experience that exhaust leaks needs to be pretty large in order to set lean codes.
Here's a good video on the free channel that shows exactly what Tyler is talking about:
Can scan files be posted on here? That would give everyone a better chance on helping and understanding what his issue is. I"m new here so I don't know. I saw you can attach files at the bottom but what type?
If you take a screenshot and save it as jpeg or png you could paste it right in.
I know some of the members of the forum were/are using scanshare.com and linking to there.
