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68mm TB - rev hang and idle surge 

 

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 Post subject: 68mm TB - rev hang and idle surge
Posted: Wed Apr 28, 2010 12:39 am 
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Just fitted a new 68mm TB on my EF 4.0... the ebay one. Idle revs now fluctuate around 900-1100rpm; after a stab on the throttle the revs stay above 1300rpm.

A brief search has only left me confused... does anyone have a surefire way to fix these issues?

 

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 Post subject: Re: 68mm TB - rev hang and idle surge
Posted: Wed Apr 28, 2010 12:46 am 
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have you adjusted the idle screw at all?, my one is backed off all the way. But to get my idle right i had to get it tuned with my SCT chip.

 

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 Post subject: Re: 68mm TB - rev hang and idle surge
Posted: Wed Apr 28, 2010 5:46 am 
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I backed off the idle screw but the rotating assembly does not spring back against it - there is a slight gap. The lowest the revs will go is about 700; if I hold it back against the screw it goes down lower (unsure but might be 500 revs; can't see the tacho while I do it!).

 

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 Post subject: Re: 68mm TB - rev hang and idle surge
Posted: Wed Apr 28, 2010 8:24 am 
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it should rest against the stop until the point its out far enough that the plate is %100 closed.

if it doesn't i'd say its been assembled incorrectly.

You should be able to disconnect the the ISC and set the idle to just above stalling, then turn it off and reconnect the ISC.
You might have issues with the TPS signal if the plate needs to be set more closed that the stock would need. in this case it means measure the TPS signal of a stock setup and adjusting the tps on the new one untill the signal at idle is the same.

 

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 Post subject: Re: 68mm TB - rev hang and idle surge
Posted: Wed Apr 28, 2010 11:08 pm 
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I have fitted a new home-made gasket to the ISC; it has smaller holes in it and now the revs are a lot better. Idle sits around 700-750 and does not fluctuate.

 

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 Post subject: Re: 68mm TB - rev hang and idle surge
Posted: Fri Apr 30, 2010 8:40 pm 
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metasaiah wrote:
I have fitted a new home-made gasket to the ISC; it has smaller holes in it and now the revs are a lot better. Idle sits around 700-750 and does not fluctuate.


+1 for this. By some cork gasket maker and use a hole punch to make the holes. That's what I did and the holes are just the right size no more rev hang and or surging at idle. It's the isc letting in more air than what the ecu is tuned for coz the larger throttle body has larger area around the butterfly that air can get in.

 

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 Post subject: Re: 68mm TB - rev hang and idle surge
Posted: Fri May 07, 2010 7:35 pm 
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I'm now using 3mm holes in the ISC gasket and the car now idles at 600 from startup; after a long drive the idle revs do not drop below 8-900rpm. The base idle has been reset by running the car without ISC connected for a while.

Any suggestions?

 

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 Post subject: Re: 68mm TB - rev hang and idle surge
Posted: Fri May 07, 2010 7:43 pm 
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with the isc disconnected what does it idle at??

if you cannot lower the idle anymore with the screw, i would be looking at the throttle plate to see if its closing properly..
you should be able to lower the base idle to the point of stalling..
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