I need some help

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I need some help

Postby RossW » Tue Dec 28, 2004 5:26 pm

I'm trying to get my 88 AllTrac running. So far I've replaced the turbo, intake pipes, cap, rotor, plug wires, plugs, knock sensor, O2 sensor, alternator, starter, and TPS. It still doesn't want to idle. It fast idles at 2k for about 20 seconds and then drops to 600 RPM, stumbles, and dies. If I unplug the TPS it drops more slowly, but ultimately it still dies. I'm running real short on ideas and the river near my house is looking tempting...

Does anyone in CT have experiance in troubleshooting the Gen1 3SGTE or have things like a known good TPS, ECU, or AFM lying around (just about the only things I haven't tested or replaced) that I could borrow to see if it fixes the problem? Thanks guys.
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Postby RIalltrac » Tue Dec 28, 2004 7:30 pm

Do you have the repair manuals? (BGB) I believe there is a procedure in there for diagnosing a bad afm. I remember seeing somewhere that you can test the resistance in the unit while moving the flapper door. Not sure which wires you have to tap into though. To me your problem sounds afm related, not sure if you can interchange the afm's between generations of the 3s either. sorry i couldnt be more help.
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Postby RossW » Tue Dec 28, 2004 7:37 pm

Yeah, that's what I've been thinking. Lol, this car has run 4 days and I've owned it for like 9 months.
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Postby RossW » Tue Dec 28, 2004 7:39 pm

http://www.dellmfg.com/celvid/100_1063.MOV

That's a vid of it trying to idle. Figure it might help with diagnosis. Sorry about the .MOV file format, stupid cheapass camera.
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Postby Mafix » Fri Dec 31, 2004 8:54 pm

sounds to me like a bad AFM.
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Postby alltracman78 » Fri Dec 31, 2004 10:32 pm

Is the 1st and 2nd g afm the same?
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Postby illGT4 » Fri Dec 31, 2004 11:58 pm

What are you referring to when you say:

"you can hear the exhaust leaks."

what exhuast leaks?

what are you pulling for vacuum at 2k and at 600 rpm?
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Postby illGT4 » Sat Jan 01, 2005 12:01 am

here is my 2 psi...


your intial 2k is because of a leak.. this is sucking unmetered air.

your 600rpm deal is related.

you may have a stuck iac valve.

have you checked the throttle cable is functioning properly?
have you tried bringing the idle up?
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Postby alltracman78 » Sat Jan 01, 2005 5:15 am

if it's sucking unmetered air, why would it idle high? That makes no sense. It should idle low all the time, or even have to have the throttle held open to idle.
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Postby illGT4 » Sat Jan 01, 2005 5:19 am

alltracman78 wrote:if it's sucking unmetered air, why would it idle high? That makes no sense. It should idle low all the time, or even have to have the throttle held open to idle.



it's the same as having the throttle plate open.

when working on 4 runner the other day.. we started it with the cold start injector out , but connected to watch it's spray pattern. As soon as the motor is started, the gapping hole in the intake manifold is sucking in air after the AFM. (3ZV-E)

I understand your train of thought. This experience the other day has made me rethink things also.
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Postby alltracman78 » Sat Jan 01, 2005 5:28 am

But why would it be the same? if the throttle plate is open, the vaccum from the engine will open the flapper in the afm. If you have a hole, it will bypass the afm, which will stay closed, unless you give it some hellacious vaccum. :D
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Postby alltracman78 » Sat Jan 01, 2005 5:29 am

your still not on aim :(

the chatroom anyways.
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Postby illGT4 » Sat Jan 01, 2005 5:39 am

alltracman78 wrote:But why would it be the same? if the throttle plate is open, the vaccum from the engine will open the flapper in the afm. If you have a hole, it will bypass the afm, which will stay closed, unless you give it some hellacious vaccum. :D


I understand what you are saying.. should make it die.. this time it didn't.. odd.
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Postby alltracman78 » Sat Jan 01, 2005 6:01 am

Damn, we really were following each other around :D

Yeah, sometimes wierd stuff happens. :shrug:
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Postby RossW » Sun Jan 02, 2005 2:50 am

Problem has been traced to flakey TPS and IAC, the car idles great now that that's been fixed. Now I just need a new mid-pipe so I can pass emissions (damn rotted flexpipe).
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