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 Post subject: ISC
Posted: Sun Jul 22, 2007 7:00 pm 
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0just put new ecu in car and now the idle sticks up. takes ages to drop down. but with old ecu idle was fine. however if i disconect my isc then the idle is good. even cold. is this an ecu problem or an isc problem?

 

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Posted: Mon Jul 23, 2007 7:53 am 
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It may just be a matter of the ECU re-learning as its from another car. Check out attachment it may help.

 

 

Attachments:
Adjusting Idle Speed.doc [25 KiB]
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 Post subject: Re: ISC
Posted: Mon Jul 23, 2007 10:33 am 
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joshannon.7 wrote:
0just put new ecu in car and now the idle sticks up. takes ages to drop down. but with old ecu idle was fine. however if i disconect my isc then the idle is good. even cold. is this an ecu problem or an isc problem?


check your base idle speed..
if you disconect isc the engine should idle at about 500 rpm or it should stall..

if it idles fast when cold without the isc lower your idle by adjusting the butterfly stop screw on the throttle body untill the rpm drops to 500rpm or lower. once you have lowered the idle speed plug the isc back in and it should work ok again..

has anyone played with your idle screw ??
maybe your isc wasnt working before and someone has turned the idle up so the car will idle??
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Posted: Mon Jul 23, 2007 10:39 am 
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joolz wrote:
It may just be a matter of the ECU re-learning as its from another car. Check out attachment it may help.


i looked at the attachment above and im not sure where the info come from but according to the factory manual the base idle without the isc is 450 to 550 rpm..
and the idle speed with the isc connected is 650 to 725 rpm..

if your base idle is 650 to 725 when your isc is disconected when you plug it back in it will bump your idle up to 900 to 1100 rpm..
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Posted: Mon Jul 23, 2007 11:29 am 
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TROYMAN wrote:
joolz wrote:
It may just be a matter of the ECU re-learning as its from another car. Check out attachment it may help.


i looked at the attachment above and im not sure where the info come from but according to the factory manual the base idle without the isc is 450 to 550 rpm..
and the idle speed with the isc connected is 650 to 725 rpm..

if your base idle is 650 to 725 when your isc is disconected when you plug it back in it will bump your idle up to 900 to 1100 rpm..


Thats what the 0.75mm feeler gauge is for, once removed it will drop back to about 450rpm. I guess its so people cant have the idle speed too high and its easier to set at 650 rather than 450rpm.
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Posted: Mon Jul 23, 2007 4:05 pm 
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Thanx for that Joolz seemd to work perfectly.

 

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Posted: Mon Jul 23, 2007 7:08 pm 
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joolz wrote:
TROYMAN wrote:
joolz wrote:
It may just be a matter of the ECU re-learning as its from another car. Check out attachment it may help.


i looked at the attachment above and im not sure where the info come from but according to the factory manual the base idle without the isc is 450 to 550 rpm..
and the idle speed with the isc connected is 650 to 725 rpm..

if your base idle is 650 to 725 when your isc is disconected when you plug it back in it will bump your idle up to 900 to 1100 rpm..


Thats what the 0.75mm feeler gauge is for, once removed it will drop back to about 450rpm. I guess its so people cant have the idle speed too high and its easier to set at 650 rather than 450rpm.


ok i guess it still works out the same.. :)
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