"1997 Tracker 4wd Auto, with a transplant 16v (G16B I believe)"
no 97 has map well that is...
sure it has a EGR map sensor, but has nothing to do with injection, at all, the EGR MAP used for the 2 EGR tests, A and B OBD2 does, p-400 A and B failures
ok , the 16v engine has a MAF, or the EFI will bee locked on to limphome for ever, burning fuel like a pig; (and side effects , red HOT cat if present, and blackend spark plug tips.
the Air clear has the maf attached. see here . DTC error P0102 if maf is missing. (output stuck low)
http://fixkick.com/sensors/92-95induct.jpg
the maf measure air flow (by MASS) and with that key fact the ECU matches fuel to the MAF air flow on all 16v and all OBD2 cars here.
it is not optional at all.
the fuel pressure on this car is controlled by the FPR, bolted to front of fuel rail.
as you idle engine, the pressure is very low, about 30psi at idle and drops to near 36 wide open throttle (or at key on, same 36psi)
When you key on it is at the highest pressure then with 19"Hg vacuum the pressure goes mid range about 30psi.
seems yours is working, the pressure drop key is caused by 3 things, bad check valve in pump, bad fpr leaking or leaking injectors. By pinching the return line we prove the FPR does not leak if pressure still drops. The tank cheap valve ball my be rusting and leaks making slower starts of engine until pressure goes higher.
The pumps sold there are just different quality factors.
here a graph i made.
![[Image: reg-graph-mpi-g.jpg]](http://www.fixkick.com/INJECTORS/PUMP/reg-graph-mpi-g.jpg)
no 97 has map well that is...
sure it has a EGR map sensor, but has nothing to do with injection, at all, the EGR MAP used for the 2 EGR tests, A and B OBD2 does, p-400 A and B failures
ok , the 16v engine has a MAF, or the EFI will bee locked on to limphome for ever, burning fuel like a pig; (and side effects , red HOT cat if present, and blackend spark plug tips.
the Air clear has the maf attached. see here . DTC error P0102 if maf is missing. (output stuck low)
http://fixkick.com/sensors/92-95induct.jpg
the maf measure air flow (by MASS) and with that key fact the ECU matches fuel to the MAF air flow on all 16v and all OBD2 cars here.
it is not optional at all.
the fuel pressure on this car is controlled by the FPR, bolted to front of fuel rail.
as you idle engine, the pressure is very low, about 30psi at idle and drops to near 36 wide open throttle (or at key on, same 36psi)
When you key on it is at the highest pressure then with 19"Hg vacuum the pressure goes mid range about 30psi.
seems yours is working, the pressure drop key is caused by 3 things, bad check valve in pump, bad fpr leaking or leaking injectors. By pinching the return line we prove the FPR does not leak if pressure still drops. The tank cheap valve ball my be rusting and leaks making slower starts of engine until pressure goes higher.
The pumps sold there are just different quality factors.
here a graph i made.
http://www.fixkick.com