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2nd gen 3sgte problem thread... - 6G Celicas Forums

Topic #80183 16 posts Started by garin
garin
#1
first off sorry if this is a repost. i put my 2nd 3sgte back together tonight. went to start it and found that it doesn't hold an idle. if i give it gas every thing is fine, but when i let off the pedal idle falls and eventually the car dies.

eliminated the neutral safety switch as well as boost/vacuum leaks as being the problem. not a fuel issue, or battery concern either! i have two or three grounds in the engine bay. wanna say it's the air flow sensor. any suggestions, or advice is appreciated!

This post has been edited by garin: Jul 24, 2011 - 10:26 PM
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Smaay
#2
could the the MAF or the idle air control valve
2001 Celica GT-S Turbo1997 Supra TT 6speed1997 Celica 3MZ/1MZ swap1990 Celica All-Trac
presure2
#3
Is your mechanical timing set properly?
Former Team 5SFTE pro member ;)13.6@108MPH, 5SFTE Powered
garin
#4
i was thinkin along those lines.
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garin
#5
ok so i got a different afm on the car. seemed to have helped, but the car eventually dies still. looking into the iac valve/ throttle position sensor. what kinda current should this have to assure that it is good?
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lagos
#6
>
QUOTE (garin @ Jul 18, 2011 - 1:04 AM) *
>ok so i got a different afm on the car. seemed to have helped, but the car eventually dies still. looking into the iac valve/ throttle position sensor. what kinda current should this have to assure that it is good?



It sounds like you have a loose coupler or some type of air leak in the system. Did you recently disconnect any vac lines or intercooler piping? The 2nd gen is very sensitive to these things and will not idle if there is an air leak somewhere.
15PSI - 30MPG - Megasquirt Tuned
lagos
#7
... and as for those sensors, you can just unplug them. If they are somehow causing an issue, unplugging them will make the car run/idle at its default values. But 99% of the time (assuming you didn't mess with the timing belt), this sort of thing is caused by an air leak in the system.
15PSI - 30MPG - Megasquirt Tuned
Stambo
#8
Mine does the same thing, my iac isn't doing anything and a new one isn't a cheap date... $200 list price for me from napa, or car quest. I just set idle by setting the idle screw to about 900 rpm
2nd Gen 3s-gte.... It lives!97celiman"92-gt-quit making up random acronyms that dont mean anything. the only real acronym is JDM"
lagos
#9
>
QUOTE (Stambo @ Jul 19, 2011 - 8:44 PM) *
>Mine does the same thing, my iac isn't doing anything and a new one isn't a cheap date... $200 list price for me from napa, or car quest. I just set idle by setting the idle screw to about 900 rpm



He actually fixed his issue but I guess didn't update here. It was just a vac leak.
If you really do need an IAC, I can get you a toyota one for well under list price.
15PSI - 30MPG - Megasquirt Tuned
Stambo
#10
well i mean cost price w/e. Just went to the next thing since he said he ruled out boost/vac leaks. Good to hear its done tho
2nd Gen 3s-gte.... It lives!97celiman"92-gt-quit making up random acronyms that dont mean anything. the only real acronym is JDM"
garin
#11
oh yes thanks for the update lagos! it was boost leak. no i have my next issue. my downpipe cracked. i broke two manifold studs while taking it out. any suggestions, or special techniques for removal?... i got a ceramic coated berks on the way!
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presure2
#12
>
QUOTE (garin @ Jul 24, 2011 - 6:03 PM) *
>oh yes thanks for the update lagos! it was boost leak. no i have my next issue. my downpipe cracked. i broke two manifold studs while taking it out. any suggestions, or special techniques for removal?... i got a ceramic coated berks on the way!

If there is anything sticking out of the head, stud remover, and a propane torch, lots of pb blaster, and patience will get them out, if they are flush with the head, it gets harder.
Former Team 5SFTE pro member ;)13.6@108MPH, 5SFTE Powered
garin
#13
they do stick out! i figured heat and some pb would work. i didn't know if anyone had any special tricks. thanks manny!
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lagos
#14
>
QUOTE (garin @ Jul 24, 2011 - 11:09 PM) *
>they do stick out! i figured heat and some pb would work. i didn't know if anyone had any special tricks. thanks manny!



I dont bother taking off the exhaust manifold for that exact reason. I just take the turbo off the manifold. Its actually not that hard to do.
15PSI - 30MPG - Megasquirt Tuned
garin
#15
>
QUOTE (lagos @ Jul 25, 2011 - 9:33 PM) *
>>
QUOTE (garin @ Jul 24, 2011 - 11:09 PM) *
>they do stick out! i figured heat and some pb would work. i didn't know if anyone had any special tricks. thanks manny!



I dont bother taking off the exhaust manifold for that exact reason. I just take the turbo off the manifold. Its actually not that hard to do.


one of the nuts to get the turbo off was stripped! d'oh.
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garin
#16
got one stud out. one more still stuck. i used propane. pb blaster and craftsman bolt out.
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