361UZ
Member
- Messages
- 167
- Location
- Canberra ACT
HI guys. Hope all is getting better in whatever neck of the woods you are from!
My 1UZ (powering the Chev hot rod) has developed a problem. I am completing the wiring, using the Crown loom and eliminating parts I dont need. But the engine, ECU, ECT etc wiring is absolutely stock. I work on the wiring, then do a test start/run to make sure everything is still ok. But recently over the last few starts, the engine progressively idles worse and worse. Ok when cold started, but as the temperature rises, the idle drops and eventually stalls. Now: it is ok cold, then begins to "lope". The revs drop from about 1000, to almost stalling, then it corrects, then drops again, but it is also very rough, like its running rich.
If I rev it up to about 1500 to 2000RPM, it is very smooth.
This issue has been getting progressively worse over the last few starts and I have made no wiring changes in this time. Yesterday it wouldn't idle at all (temperature about 1/2 way between cold and normal). It also threw a code! I cannot find the diag codes for a Crown anywahere. I have a set from an LS400 (1990). The code I am getting is 31 which on the LS400 is Air Flow Meter. (Makes sense given the conditions I am getting the problem under).
I have checked the wiring (all bog standard) from the AFM to the ECU. Agrees with the wring diagrams. I am seeing +5Volts on the AFM. At the ECU end I see +5Volts going to the AFM, +3 Volts on the inlet air temp wire (very cold day), +5Volts on the AFM output (car not running, just IGN on).
Questions: If I scope the AFM output to the ECU, what should I expect? Is it a waveform or a voltage level?
I have checked for corroded pins etc, removed and checked the AFM etc, all looks like new. The ECU pins are all good and bright brass coloured. Checked inside the ECU, no swollen/leaky caps. Well, very few caps in there at all. None around where the AFM wiring plugs in.
If I clear the code, it will re-occur at next start. Although the problem has been around for a while, the error code only happened yesterday, but now is solid. If I clear it, it will re-occur again straght away at the next start.
Summary: Am I interpretting the error code correctly (Is 31 a bad AFM on a 1989 Crown)? Anything else to check?
Thanks heaps!
My 1UZ (powering the Chev hot rod) has developed a problem. I am completing the wiring, using the Crown loom and eliminating parts I dont need. But the engine, ECU, ECT etc wiring is absolutely stock. I work on the wiring, then do a test start/run to make sure everything is still ok. But recently over the last few starts, the engine progressively idles worse and worse. Ok when cold started, but as the temperature rises, the idle drops and eventually stalls. Now: it is ok cold, then begins to "lope". The revs drop from about 1000, to almost stalling, then it corrects, then drops again, but it is also very rough, like its running rich.
If I rev it up to about 1500 to 2000RPM, it is very smooth.
This issue has been getting progressively worse over the last few starts and I have made no wiring changes in this time. Yesterday it wouldn't idle at all (temperature about 1/2 way between cold and normal). It also threw a code! I cannot find the diag codes for a Crown anywahere. I have a set from an LS400 (1990). The code I am getting is 31 which on the LS400 is Air Flow Meter. (Makes sense given the conditions I am getting the problem under).
I have checked the wiring (all bog standard) from the AFM to the ECU. Agrees with the wring diagrams. I am seeing +5Volts on the AFM. At the ECU end I see +5Volts going to the AFM, +3 Volts on the inlet air temp wire (very cold day), +5Volts on the AFM output (car not running, just IGN on).
Questions: If I scope the AFM output to the ECU, what should I expect? Is it a waveform or a voltage level?
I have checked for corroded pins etc, removed and checked the AFM etc, all looks like new. The ECU pins are all good and bright brass coloured. Checked inside the ECU, no swollen/leaky caps. Well, very few caps in there at all. None around where the AFM wiring plugs in.
If I clear the code, it will re-occur at next start. Although the problem has been around for a while, the error code only happened yesterday, but now is solid. If I clear it, it will re-occur again straght away at the next start.
Summary: Am I interpretting the error code correctly (Is 31 a bad AFM on a 1989 Crown)? Anything else to check?
Thanks heaps!