33 gtst - clutch and full exhaust (bellmouth)
Had issues for a while when I fill up tank with fuel and start the car it won't idle correctly and hunts (sometimes stalls)
This issue I was always a bit whatever about it. Hit the throttle and she settles ok.
Major concern is:
I have had a very intermittent issue where the exhaust will pop when I decelerate with no throttle and then touch the throttle it will pop no matter how many times I go on an off throttle. Sometimes it will get so bad it will pop whilst decelerating down revs without touching the throttle.
Through the revs doesn't miss a beat.
Did it with 2 different motors in it. (blew motor) Only things that remained on change of engine was afm, tps, coils and loom. (fuel pump of course)
Cas, plugs, fpr, injectors all changed.
I got consult to find O2 sensor sitting at .3 when cold then when at temp sits around .1-.2V. Had a spare sitting around so tried that and it just read 0.0-0.15V. So I Bought O2 sensor and found readings Fluctuated from .28-.80V. Which a mates car also did. Got better fuel consumption of course.
Car still popped intermittently.
Tested for vac leak and all good.
Tested tps voltage and all good.
Also I originally had exhaust studs snapped so gathered that would cause popping. Changed all studs and gasket. Still popped intermittently.
It was very intermittent so hard to diagnose but of course now I am in QLD on holidays it is doing it a lot more then normal.
I have found that when I'm low on fuel it doesn't pop at all no matter how much I cruise or thrash it. I pull into servo and put fuel in and I pull out to check if it pops and it does.
So I am thinking fuel pump but why or can u guys think of something else?
Sorry for massive read but wanted to give as much info as possible.
I also understand if u all are not in the mood to think as it is Easter and u may be drunk or hungover.