question .. who can help?

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pimptrizkit

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Dec 22, 2005
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alright , well im not sure what my car's problem is, but i want to get some feed back ..


my car wont start when the throttle is completly closed, witht he throttle linkage off. i would think the car should run with the throttle completly closed... all my other cars do... and my i hook up my maft pro i get an erratic idle. until i open the throttle a little more and she'll idle better..


is it possible that an japanse mechanic adjusted the idle speed to try to pass emissions?

should i be concerned about ajdusting my tps?

on my maft pro unit at fully closed it's around 1.84-1.86 and fully open around 3.56...



so can any one just unclip their afm and the thottle linkage and start their car and see what happens?
 
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pimptrizkit

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Dec 22, 2005
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alright i'll pull out my ohm meter tomorrow and test it, do i have to pull it off to test it?

i do hear clicking when my motor dies or shuts off, and it says to look for that..
 
jetjock

jetjock

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Jul 11, 2005
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Redacted per Title 18 USC Section 798
Does it start and run when you hold the throttle crack? If so it is, as IJ pointed out, an ISC problem. As for the TPS, the IDL contacts on it must be closed for the ISC system to work. Either measure them or jumper the diag block and crack the throttle. You should get an idle code when the throttle is cracked and a normal code when it's closed. That your ISC is stepping back at shutdown does not prove the IDL contacts are closed as the ecu will reset the ISC valve even with thecontacts open.

You can ohm the ISC out to see if it's electrically OK but the only way test it for sure is to remove it and step it of the car using some jumpers.

I believe the turbo and n/a ISC is identical so yeah, a swap would help. You have to remove it anyway. You could test in while it's out and still hooked up to the car too, just plug up the hole and restrict the airflow. Start the car and the ISC should step in an attempt to control idle. If you do this you should not be able to easily turn it by hand.
 
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pimptrizkit

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Dec 22, 2005
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alright that makes some sense. i'll see what i can do about it today..


does an n/a have the same part? i still have an n/a manifold would swaping it out help?
 
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pimptrizkit

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Dec 22, 2005
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well though this into the loop,

i tested the isc and it is such a bullet proff simple motor i dont belive how it could ever break.. i got it to work and move in and out, btw this is the slowest motor ive ever tester..

so i look to the tps and try to test it on car, i felt it just might have been out of ajdustment, so decided to pull the tb, and bring it inside , start testing it to see if it's working, and cant seem to get a good reading, pulled it off and noticed that is doesn't seem to spine freely.. and the one on the 7mge i have snaps back closed.
 
Dirgle

Dirgle

Conjurer of Boost
Mar 30, 2005
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The ISC is a stepper motor, and it is a fairly complex electric motor. The only one I have ever seen fail died from the inside out because of something similar to battery corrosion. It interfered with the movement and power of the motor. It is the only ISC that I have personally seen fail, and I have no idea why the corrosion occurred in the first place.
 
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IJ.

Grumpy Old Man
Mar 30, 2005
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I come from a land down under
pimptrizkit said:
well that would through it al out of wack right?


thats what i assumed so i stoped tring to adjust it.
Click to expand...
I think Carb cleaner works to degunk it Pimp!
(If I'm wrong someone will jump in and correct me as I use a different style valve)
 
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