Idle & Low rpm miss fire - Bigport
AE82 Bigport motor only has 20,000 on it since rebuild.
TVIS is hooked up, RWD manifold from JDM biport, Installed and wired in by me ~2 months ago,
has developed a idle and low rpm miss fire in the last 2 weeks. Any thing over 4000~4500rpm is
clean and free revving, anything under 4000 will not hold even rev and misses. I changed plugs,
leads, dizzy cap and rotor but still does it. I didn't wire up the Diagnosis plug, so don't know if its
throwing a code
When driving if it has load on it then its OK, but cruise it will miss. It feels a
little bit rich, 1st to 2nd, 2nd to 3rd will pop a little back fire between gears driving sedately.
Timing is set to 0 on the marks, runs on 98 octane only, no pinging and has heaps of power, but yeah...
I noticed if I pinch the MAP sensor hose the revs clean up and the miss at idle
goes away, also it will hold clean even rev @ ~2500-3000rpm (can't see tacho).
I have the MAP and the stock FPR T pieced together off 1 brass fitting in the
back of the manifold. I was told that full vacuum signal to the FPR will make it
run choppy at low rpm? Could this be my issue?
Does anyone in Brisbane have a Bigport MAP sensor I could borrow and see if
this is my problem?
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