SpeedAddict62
15+ Year Contributor
- 321
- 4
- Jun 5, 2006
-
Corvallis,
Oregon
Ok, posting this here because the 4G61T is basically a downsized 4G63T and I need all the help I can get. Already posted this on 4g61t.org, but figured I would get more responses here. Car is a 1989 Mitsubishi Mirage Turbo. Here is the issue:
- low idle, hot or cold
- idle surge
- stalls when stopping (clutch in or neutral)
- very hard to start after stall
- starts right up when cold
The car hasn't always done this, just started recently. ISC tests good, I tested it with a multimeter and it was in spec (about 31 ohms) and plugged it in and turned the key on and off to verify movement. The only thing that doesn't seem right is the timing - right around TDC at low idle. This showed on the logger and I verified it with a timing light. When the idle surges, timing jumps to 8 degrees (where it should be) and idle is right where it should be (around 750 rpm). Then it falls back to a low idle, barely running, and 0 degrees timing. I also logged a WOT run with timing maxing out at 3 degrees without knock. I'm at a loss of what to look for here. ECU maybe? Any suggestions are appreciated.
- low idle, hot or cold
- idle surge
- stalls when stopping (clutch in or neutral)
- very hard to start after stall
- starts right up when cold
The car hasn't always done this, just started recently. ISC tests good, I tested it with a multimeter and it was in spec (about 31 ohms) and plugged it in and turned the key on and off to verify movement. The only thing that doesn't seem right is the timing - right around TDC at low idle. This showed on the logger and I verified it with a timing light. When the idle surges, timing jumps to 8 degrees (where it should be) and idle is right where it should be (around 750 rpm). Then it falls back to a low idle, barely running, and 0 degrees timing. I also logged a WOT run with timing maxing out at 3 degrees without knock. I'm at a loss of what to look for here. ECU maybe? Any suggestions are appreciated.
