weird problems

[chehsgsx]

Ok so i have had an idle issue for quite some time now. I also have the code p1500, iv tested the alt. and it checks out. Even took it to pepboys to have it checked, all seemed good.
So i moved on to testing the wiring to he ecu from the alt. that was ok, i had continuity.


So i moved on to replacing the ecu, now the ecu is in and im waiting to see if the code comes back but my idle is no better?!?!???! I just started to connect the two problems but maybe there not, iv replaced the iac too and have a fiva block off but i didn't install that yet.

Just an fyi the idle is never the same, sometimes its nice and low others its at 2,000. Though it never goes above 2,000, and it can change very quick like in seconds or slowly over a long drive.


Im really at a dead end with this so if you guys can think of anything that would be great.

 

[twdorris]

Im really at a dead end with this so if you guys can think of anything that would be great.

While the car is idling poorly, check to see if the idle switch is active or not.

Thomas Dorris

 

[chehsgsx]

how do i check that?

 

[twdorris]

how do i check that?

That depends on what you have available to you. If you have a logger, then simply log IdleSw and observe its operation. If you do not, then you'll need to break out the volt meter and measure it directly. I find it easier to do that by measuring directly off the ECU backplane. Pin numbers you'll need can be found here:

ecuwiringinformation [ECMTuning - wiki]

You'll put the positive terminal on +5v and the negative terminal on the idle switch input then monitor operation. The idle switch input is grounded (and the volt meter will show near 5v) when the idle switch is active.

Thomas Dorris

 

[chehsgsx]

hmmm ok ill take a look at this.

As a side note, i have a scanner .. but that's not a logger rite?

 

[mikelv]

Well, this could be a billion things so I hear your fustration.

Try looking into these pages on the ISC:

Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)

2G BISS Adjustment

DmTaLoN's Idle Speed Control Test/Fix Page!

Idle Surge FAQ

There are multiple pages to read under the intake link here:

Visual Frequently Answered Questions - Home Page


Lots of good information there. Now after you've tested the ISC, made you adjustments with the BISS, and looked over everything, make sure you look at your base timing. Throw a timing light on there and give it a shot.

Is your profile updated? A little more revelant information on what you're running would help as well.

 

[chehsgsx]

My profile is up to date, and just a little back round i have already replaced the tps and the isc.

My car is down rite now (see my other active post) but i believe when i first got the tps i was dumb and tried to adjust it like you would on the 1g. (my bad) i redid it the rite way and im hoping after the cars back up and running ill see and improvement.


And i book marked all the links just in case

Thanks for the help guys