1998 Tracker, 16v, 3spd Stalling and Stumbing rears it's ugly head again.

[fixkick]

test 2,>? after below is , are all 4 spark plug tips black, if yes, below, no one is black , injector leaks or new spark plug bad there.
go to harbor FRIGHT (sp, lol)
then get this tool has , the 6mm suzuki hose there.

http://www.fixkick.com/INJECTORS/TBI-conn-1w.jpg


the top hose above, fits this suzuki,
http://www.harborfreight.com/fuel-inject...62623.html

at sealevel hot idle 800 rpm is

does vacuum hose on FPR leak fuel> yes, its bad.
off my pump page

Static: 36-43 PSI, keyon, not started ( you may have to key on 3 times to build enough pressure, pump runs on 3 seconds)
Running: 30-37 PSI , idling.
Residual :25 PSI , after 1min. drop test. key off , test. (running , key off, time it) I call it the leak down test. if fails, injectors may be leaking.



my FPR page
see this, using hand vacuum tool
get these results.
30psi then at wide open throttle 36psi
the FPR must show the 6psi dynamic range or its Bad,
http://www.fixkick.com/INJECTORS/PUMP/re...-mpi-g.jpg

the FPR is tricky
it changes for vacuum in the plenum and for altitude.
at high plenum vacuums it drops fuel pressure as much as 8psi. if not the engine floods.

if the FPR is stuck at WOT mode, at idle it will flood, go super rich and misfire badly.