Engine keeps dying, troubleshooting and need help

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dafty84
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Engine keeps dying, troubleshooting and need help

Post by dafty84 » Tue Dec 05, 2006 2:23 pm

(1994 Stealth TT) For a while now, and it seems to get progressively worse over time, my engine keeps dying at idle. At cold startup, its fine, and in driving conditions its fine, but when its warm and i stop at a stop light, it will kill most of the time. Same with warm startup. If i park the car after its been driven for awhile and start it back up, it will start, rev up, and drastically drop down and kill. I have plugs and wires that have less than 10k on them (iridiums and msd's) so i know that is not the cause. Car ran fine for at least 8k until these symptoms starting happening. Ive had the injectors flushed, and ran sea foam through the fuel system and crankcase, and cleaned my air filter. Nothing has helped. Im not getting any check engine lights and unfortunately i do not have a scan tool. Do you guys have any ideas what might be the culpret?

Thanx and appreciate the help!

DJ
Last edited by dafty84 on Tue Dec 05, 2006 5:26 pm, edited 5 times in total.
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Post by curt_gendron » Tue Dec 05, 2006 3:39 pm

You should start by turning your BISS screw out a little. That should raise your base idle and might prevent it from dieing on you. The BISS screw is right on the throttle body. It might have a rubber stopper on it.

Here is a picture of it on a DSM: http://dsm.aenewton.com/images/biss.jpg Its in the same spot on a 3/S

If this doesn't fix it, you might have a bad ISC or TPS. Or one of them might need an adjustment.

later,
Curt
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Jon M

Post by Jon M » Tue Dec 05, 2006 3:59 pm

Could you please expand those acronyms?

BISS

TPS

ISC

Thanks.

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Post by curt_gendron » Tue Dec 05, 2006 4:21 pm

BISS = Base Idle Set Screw
TPS = Throttle Position Sensor
ISC = Idle Speed Controller
NEWB = Jon M
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Post by dafty84 » Tue Dec 05, 2006 4:37 pm

That makes sense, figures that i overlook the simple stuff lol. Appreciate the help Curt. Will post what i discovered.

Thanx!

DJ
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Jon M

Post by Jon M » Tue Dec 05, 2006 6:10 pm

curt_gendron wrote:NEWB = Jon M
Damn you!! Ha ha j/k It was funny. :D

Would the BISS be adjusted while the car is running or while shut off?

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Post by curt_gendron » Tue Dec 05, 2006 6:20 pm

Jon M wrote:
curt_gendron wrote:NEWB = Jon M
Damn you!! Ha ha j/k It was funny. :D

Would the BISS be adjusted while the car is running or while shut off?
You can adjust it when the car is running.
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Post by Machme72 » Wed Dec 06, 2006 2:32 am

if you want to test the IAC/ISC the website is very helpful :wink: i think that o ring on the biss is important and if its missing you wanna get that fixed.

http://rdmelton.autoeducation.com/cars/stealth/iac.html

good luck!!
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Post by dafty84 » Thu Dec 07, 2006 10:30 am

It ended up being the throttle position sensor. Voltage was haywire when i tested it. Replaced it and now the world is the way it should be. Thanks a bunch for the help guys!

DJ
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Re: Engine keeps dying, troubleshooting and need help

Post by LandonIsler » Tue Jun 23, 2009 6:08 am

I see this thread is very old but my car is having almost exact same problems. I have a brand new TPS ready to be pout in but I am not sure how to go about installing it. Do I just drop it in? I have read a few threads on this and it says it needs to be adjusted some how?

Thanks,
Landon

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Re: Engine keeps dying, troubleshooting and need help

Post by kelgalis » Tue Jun 23, 2009 6:32 am

LandonIsler wrote:I see this thread is very old but my car is having almost exact same problems. I have a brand new TPS ready to be pout in but I am not sure how to go about installing it. Do I just drop it in? I have read a few threads on this and it says it needs to be adjusted some how?

Thanks,
Landon
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Re: Engine keeps dying, troubleshooting and need help

Post by LandonIsler » Tue Jun 23, 2009 7:14 am

Yea I browsed through there but I don't really understand what they mean. Any one able to translate this? Haha, I tried exactly what it says but I don't get the circuit tester part.

Thanks,
Landon

(1) Install the throttle position sensor to the throttle body as
shown in the illustration.
(2) Turn the throttle position sensor 90” counterclockwise to
set it, and tighten the screws.
!I
(3) Connect a circuit tester between (1) (ground) and (3)
(output), or between (3) (output) and (4) (power). Then,
make sure that the resistance changes smoothly when the
throttle valve is slowly moved to the fully open position.
(4) Check for continuity across terminals (2) (closed throttle
position switch) and (1) (ground) with the throttle valve both
fully closed and fully open.
If there is no continuity with throttle valve fully closed, turn
the throttle position sensor clockwise, and then check
again.
(5) If the above specifications are not met, replace TPS.

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Re: Engine keeps dying, troubleshooting and need help

Post by curt_gendron » Tue Jun 23, 2009 12:42 pm

These pages in the manual will help with the TPS:
http://mn3s.org/tps1.jpg
http://mn3s.org/tps2.jpg
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