I inherited this Sammi for $$ from sspence (so I think it's ok to hijack the thread). We drove it for a couple days and noticed an occasional engine stumble and infrequent backfire when off throttle. We also noticed a prevalent fuel smell and what seemed to be excessive fuel consumption (but haven't driven it enough to calculate). My wife was driving it and it stalled at a stop. She restarted and said it was missing and generally running very poorly. She tried to limp it, but it stalled out again and she had to get it towed home.
Recap: 1988 1/2 Samurai, 1.3 with 90 TBI conversion, ECU = 89 Tracker, coil/distributer is vintage 88, EGR valve & associated parts removed, NAG switch removed.
I've been trying to troubleshoot the problem: It starts and idles (a little rough) when cold, stalls once it starts to warm up. Plugs are black and exhaust is smoky (reeks of fuel). TBI looks wet inside (fuel seen streaming on throttle plate).
- No codes (not sure if the ECU to harness wiring is correct); CEL comes on steady prior to start and goes out while running. Diagnostic fuse in fuse box doesn't do anything (NAG removed). TBI wiring harness has a Diagnostic Switch Terminal behind the battery. Jumper does not produce any flash codes (no code 12). sspence said he never tried to check codes.
- Fuel pressure seems good (40 psi at filter port and 50 psi deadhead after FPR while cranking), FPR leakdown and vacuum checks (smoothly decreasing fuel pressure) seem OK, but TBI is flooding.
- Haven't done any other sensor/actuator checks yet. Not sure whether I should replace the ECU first or not.
- Not sure if the vacuum lines are routed correctly for this configuration (smog [EGR valve, VSV, dash pot, CAT] removed). Searching for a diagram or photo (mainly MAP connection).
Next step?
Recap: 1988 1/2 Samurai, 1.3 with 90 TBI conversion, ECU = 89 Tracker, coil/distributer is vintage 88, EGR valve & associated parts removed, NAG switch removed.
I've been trying to troubleshoot the problem: It starts and idles (a little rough) when cold, stalls once it starts to warm up. Plugs are black and exhaust is smoky (reeks of fuel). TBI looks wet inside (fuel seen streaming on throttle plate).
- No codes (not sure if the ECU to harness wiring is correct); CEL comes on steady prior to start and goes out while running. Diagnostic fuse in fuse box doesn't do anything (NAG removed). TBI wiring harness has a Diagnostic Switch Terminal behind the battery. Jumper does not produce any flash codes (no code 12). sspence said he never tried to check codes.
- Fuel pressure seems good (40 psi at filter port and 50 psi deadhead after FPR while cranking), FPR leakdown and vacuum checks (smoothly decreasing fuel pressure) seem OK, but TBI is flooding.
- Haven't done any other sensor/actuator checks yet. Not sure whether I should replace the ECU first or not.
- Not sure if the vacuum lines are routed correctly for this configuration (smog [EGR valve, VSV, dash pot, CAT] removed). Searching for a diagram or photo (mainly MAP connection).
Next step?