Idle hunting issue - Page 2

Durandal · 07-17-2010, 09:06 PM

Yah removed the tape today and there are crimp connectors and all the wires are red striped black wires which are grounds i believe? I don't know why it is the way it is though.

pwpanas · 07-17-2010, 09:27 PM

Quote:

Originally Posted by Durandal

Yah removed the tape today and there are crimp connectors and all the wires are red striped black wires which are grounds i believe? I don't know why it is the way it is though.

Crimp connections in general are good (Toyota never uses solder - it's a less relaible connection over time on a moving/vibrating vehicle than a proper crimp). That said, I'd guess you're referring to a cheap plastic press crimp.

Regarding the wire colors in the harness, it's best to refer to the TSRM:
http://www.mkiv.com/manual/1995_elec...ual/index.html

Durandal · 07-18-2010, 12:31 AM

No the crimps were all metal and seemed very secure. I have seen mentions of some splices in some factory wiring diagrams so maybe they are normal.

After some more testing my recent problem of the CEL and MIL coming on after driving for awhile has got me thinking it could be something as simple as the O2 sensor on the way out. It seems to always come on after driving for about 15 minutes after the car has warmed up a bit. It still doesn't explain why when I check for codes it says there are none, or the trac off light flashes and my CEL doesn't even blink. The car definately runs rich when this happens. Ox1 reads above 0.9v, exhaust smells almost like straight gasoline. Can oxygen sensors work bad when warmed up but fine when cold? I always pegged them as a failing unit.

Durandal · 07-18-2010, 12:45 AM

I think the crimps are labeled on this picture as "E24" splices.

Durandal · 07-25-2010, 12:43 AM

At long last I traced all my problems to a bad battery. It had never been below 12 vdc when I checked it but after doing some testing, I found that it wouldn't hold a charge much past 12.15 volts. If you charged it up to around 12.7 volts with a charger and hooked a multi meter up to it with nothing else connected you could watch the voltage drop and in about 10 minutes it was at 12.05. It would never drop below 12 volts so I never thought much of it until this test.

Replaced it with a new battery and after a test drive the voltage is reading 12.9 and not dropping. Roughly 1 volt makes all the difference in the world after factoring in the resistance of the wires.

pwpanas · 07-25-2010, 05:24 PM

Quote:

Originally Posted by Durandal

At long last I traced all my problems to a bad battery. It had never been below 12 vdc when I checked it but after doing some testing, I found that it wouldn't hold a charge much past 12.15 volts. If you charged it up to around 12.7 volts with a charger and hooked a multi meter up to it with nothing else connected you could watch the voltage drop and in about 10 minutes it was at 12.05. It would never drop below 12 volts so I never thought much of it until this test.

Replaced it with a new battery and after a test drive the voltage is reading 12.9 and not dropping. Roughly 1 volt makes all the difference in the world after factoring in the resistance of the wires.

So it idles 100% consistently now?

Durandal · 07-25-2010, 06:33 PM

I haven't done as much extensive testing as I would have liked yet since I got hit with a down pour. However starting the engine from a cold start gave me 1300 RPM while it warmed up and then dropped down to 900 RPM when the engine had reached operating temperature. So I do in fact now have a working cold start system.

Durandal · 08-27-2010, 01:06 PM

Updating this since it's been fixed for awhile now. The problem came back and after looking inside my ECU found some burnt components, most likely from the time I boosted my car awhile ago when my battery died. At least that's what I think caused it. I got a second hand ECU from England to replace it. Really hard to find a JDM ECU around here.

pwpanas · 08-28-2010, 09:05 AM

Quote:

Originally Posted by Durandal

Updating this since it's been fixed for awhile now. The problem came back and after looking inside my ECU found some burnt components, most likely from the time I boosted my car awhile ago when my battery died. At least that's what I think caused it. I got a second hand ECU from England to replace it. Really hard to find a JDM ECU around here.

Glad you got it fixed. You sure went through a lot to finally track it down.

07-18-2010, 12:31 AM	#13
Durandal Intake Join Date: Aug 2008 Location: Canada Posts: 42	No the crimps were all metal and seemed very secure. I have seen mentions of some splices in some factory wiring diagrams so maybe they are normal. After some more testing my recent problem of the CEL and MIL coming on after driving for awhile has got me thinking it could be something as simple as the O2 sensor on the way out. It seems to always come on after driving for about 15 minutes after the car has warmed up a bit. It still doesn't explain why when I check for codes it says there are none, or the trac off light flashes and my CEL doesn't even blink. The car definately runs rich when this happens. Ox1 reads above 0.9v, exhaust smells almost like straight gasoline. Can oxygen sensors work bad when warmed up but fine when cold? I always pegged them as a failing unit. Last edited by Durandal; 07-18-2010 at 12:36 AM.

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07-17-2010, 09:06 PM	#11
Durandal Intake Join Date: Aug 2008 Location: Canada Posts: 42	Yah removed the tape today and there are crimp connectors and all the wires are red striped black wires which are grounds i believe? I don't know why it is the way it is though.

07-18-2010, 12:45 AM	#14
Durandal Intake Join Date: Aug 2008 Location: Canada Posts: 42	I think the crimps are labeled on this picture as "E24" splices.

07-25-2010, 12:43 AM	#15
Durandal Intake Join Date: Aug 2008 Location: Canada Posts: 42	At long last I traced all my problems to a bad battery. It had never been below 12 vdc when I checked it but after doing some testing, I found that it wouldn't hold a charge much past 12.15 volts. If you charged it up to around 12.7 volts with a charger and hooked a multi meter up to it with nothing else connected you could watch the voltage drop and in about 10 minutes it was at 12.05. It would never drop below 12 volts so I never thought much of it until this test. Replaced it with a new battery and after a test drive the voltage is reading 12.9 and not dropping. Roughly 1 volt makes all the difference in the world after factoring in the resistance of the wires.

07-25-2010, 06:33 PM	#17
Durandal Intake Join Date: Aug 2008 Location: Canada Posts: 42	I haven't done as much extensive testing as I would have liked yet since I got hit with a down pour. However starting the engine from a cold start gave me 1300 RPM while it warmed up and then dropped down to 900 RPM when the engine had reached operating temperature. So I do in fact now have a working cold start system.

08-27-2010, 01:06 PM	#18
Durandal Intake Join Date: Aug 2008 Location: Canada Posts: 42	Updating this since it's been fixed for awhile now. The problem came back and after looking inside my ECU found some burnt components, most likely from the time I boosted my car awhile ago when my battery died. At least that's what I think caused it. I got a second hand ECU from England to replace it. Really hard to find a JDM ECU around here.