Quote:
Originally Posted by jhv48
I’m no FI expert but could the problem be a failing/rusted/plugged 02 sensor?
Might be a simple cheap thing to try first.
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Yes, it could be, but only because it had a primary reason to fail.. O2 sensors rarely fail on their own, especially at this age...
Which does make me wonder. I'd get in touch with FAST support and see if there is an equivalent of a "check engine light" code that can be read. You mentioned it had an OBDII connector - how about getting a bluetooth OBDII reader and seeing if it's throwing codes???
Have you tried to download the documentation for that system??? They usually have some kind of troubleshooting tree.
You mentioned that it did backfire, so it's been running rich probably since the beginning. Instead of post-installation troubleshooting I'd start with verifying that the installation was done correctly.
One more... My very initial problem turned out to be that while the engine ran, the throttle position sensor cable was wired backwards (yes, it was a Roush part, and they told me it was likely mine was and it was.) That causes lots of problems because the DFI system at true idle thinks it's running WOT and at WOT is closed... That's really confusing to the software. Their software should give you real-time readouts of TPS and other sensors...