Quote:
Originally Posted by Squidward
Where is JLMounce? I'm pretty sure he listens to efi audio books while he sleeps!
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Lol, I’ve been away from the computer!
OP the very first thing I would check is that there isn’t a vacuum leak at the throttle body base. That’s one of the more common issues that can cause a lean pop.
In regards to the o2 fault you’re seeing, that is normal on cold start. Original FiTexh models warmed the o2 sensor but that can cause shortened life. Later models have that feature turned off, so for about 20-30 seconds after start you’ll get an o2 temp fault. You can ignore that.
Are you running timing coontrol through the FiTech? If that’s the case, I would check to make sure the distributor hasn’t moved and that the advance is still locked out. If you do run timing control try unhooking that system and run the car traditionally with the distributor. If the problem is solved, you’ve gotta figure out what’s going on with the spark.
Off idle lean stumble is somewhat common with these systems after about 500-700 miles of learning. Watch what your AFR is doing when you try to come off idle. Do you have a rich or a lean bog occurring? Figure out which direction the AFR is running and go the opposite direction in the accel pump settings.
There are four settings that correlate to accel pump fueling. dTPSgain hits first and correlated to slow tps movements. Next is dTPS acc max. This is the maximum modifier for the dTPSgain. Try adding a couple percent to these which can help you out.
Next is Accel Pump and Fast Accel for the three temperature breakpoints. Accel pump is added after dTPSgain and correlates to the MAP signal. Fast Accel is last and uses a combination of the MAP and Alpha N maps with tps and correlates to your sharp transient situations, like stomping the throttle off idle.
These stack so work in order of dTPS > Accel > Fast Accel.
More often than not this situation is a lean stumble, but every once in a while the system will push rich in the transient event.
You’re going to also need to verify fuel pressure with a gauge. Considering this happened originally at a higher rpm, it’s possible you’ve got a fuel delivery issue. What fuel system are you running?