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Wifes EL high revs on startup and slow to come down???? 

 

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 Post subject: Wifes EL high revs on startup and slow to come down????
Posted: Thu Mar 31, 2011 8:32 pm 
Oompa Loompa
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Hi there,im after some info on whats causing my wife el wagon to rev to 2000rpm on start up and slow to come down even when driving in traffic you give it a bit and it takes ages to come back to idle its got me stumped.cheers
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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Thu Mar 31, 2011 8:35 pm 
Tyre Shredder
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I would start by cleaning the throttle body and ISC with carbi clean spray..

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Thu Mar 31, 2011 8:52 pm 
Getting Side Ways
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Automatics have rev hang, mine does it worse than other falcons for some reason,

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Thu Mar 31, 2011 9:13 pm 
Oompa Loompa
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Yea its a total pain in the butt,the wife naggs me everyday about it i will give the throttle body a good clean on the weekend and see if that helps.I even reset the ecu it seemed to be allright at first but then it came back.thanks for your help
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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Fri Apr 01, 2011 8:01 am 
Getting Side Ways
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Check the condition of your throttle cable. It might be frayed, kinked or not moving freely. Also remove the TPS (throttle position sensor) on the side of the throttle body and see if it works properly.

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Sat Apr 02, 2011 2:58 pm 
Stock as a Rock
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fixed a guys the other day, unplug the bloody ISC altogether and bump up the idle manually with the idle screw if the revs drop too low. Ive had to do it to mine too and my ISC is brand new. The ECU will control the revs on decel and i believe the ISC stays open when disconnected which should allow it to idle fine without having to adjust the idle screw.

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Sat Apr 02, 2011 3:02 pm 
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Can also be faulty ISC controller in the ECU. If a clean or replacement of the ISC doesnt help, then next thing would be swapping out the ECU.

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Sat Apr 02, 2011 3:28 pm 
Stock as a Rock
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I've tried 2 ECU's and still no difference. But i have done mods which the computer doesn't like.

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Sat Apr 02, 2011 3:37 pm 
Getting Side Ways
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I unplugged my isc and now it wont start properly, once its running its ok tho

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Sat Apr 02, 2011 4:45 pm 
Stock as a Rock
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may need to bump up the idle screw to compensate for when its cold

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Sat Apr 02, 2011 7:36 pm 
Oompa Loompa
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Cheers fella,s i give it a crack tommorow and see what happens.
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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Sun Apr 03, 2011 10:35 am 
Getting Side Ways
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Waggin wrote:
Can also be faulty ISC controller in the ECU. If a clean or replacement of the ISC doesnt help, then next thing would be swapping out the ECU.



the step before wasting money on an ECU would to fix the huge vacuum leak that is confusing the crap of the ECU.

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Tue Apr 05, 2011 8:13 pm 
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is it only doing it when cold? cos most fuel injected cars bump up the idle when its cold until the ecu is confident enough that the engine car idle lower without stalling. if you disconnect the IAC and wind out the stop screw it may not want to idle on a very cold morning (like mine, doesnt bother me though). it might be worth resetting and relearning the IAC before you disconnect it, has worked for some (not me)

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Tue Apr 05, 2011 9:19 pm 
Getting Side Ways
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Vote 2 for vaccuum leak. Had same problem with the XH. Turned out I had inadvertantly fitted the rear intake manifold gasket upside down so the cutouts for the injectors were on the bottom. These created a vaccuum leak I could hear but couldn't track down. Tried everything else (as you have) then removed the manifold and found the problem.

 

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 Post subject: Re: Wifes EL high revs on startup and slow to come down????
Posted: Tue Apr 05, 2011 9:28 pm 
Getting Side Ways
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p****d'N'broke wrote:
is it only doing it when cold? cos most fuel injected cars bump up the idle when its cold until the ecu is confident enough that the engine car idle lower without stalling. if you disconnect the IAC and wind out the stop screw it may not want to idle on a very cold morning (like mine, doesnt bother me though). it might be worth resetting and relearning the IAC before you disconnect it, has worked for some (not me)

How do u reset or relearn the iac?

 

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