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cant get modified el xr8 to idle properly 

 

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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Tue Jun 12, 2012 8:36 pm 
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Seems ok.
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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Mon Jun 25, 2012 9:39 pm 
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yeh my tps is is fine its a brand new one. I have come to the conclusion its most likely a vacuum leak. That and my tune is not going to help the cause. O2 sensors shouldnt cause the car to hunt and stall all the time should they? I thought the side affect is running rich/lean etc
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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Mon Jun 25, 2012 9:50 pm 
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O2's can cause a dodgy idle but it's usually a symptom of something else. A vac leak could certainly cause this sort of problem.
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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Wed Jul 18, 2012 9:46 pm 
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I figured i'd keep this thread going,

I just spent the weekend taking off upper manifold, blocked EGR, replaced hoses that were cracked, made sure pcv was secured properly.

It was really good yesterday when i drove it,behaved like a stocker with a tuff idle......

However,

Today/tonight when i drove it,it is now starting to stall when i let go of the accelerator to turn a corner, it seems worse when lights are on.

I blocked up the hole on the TB that comes from oil filler, i noticed that the hose from the rocker cover was sucking air, i blocked it up for a few seconds and the pressure got higher, i realeased the oil cap and it sucked a lot of air.

Is the rocker covers supposed to be under a vacuum??


Any pointers guys would be greatly appriciated as this problem is doing my head in

Cheers,

Al

 

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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Wed Jul 18, 2012 10:20 pm 
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On std EEC the crankcase is fully sealed with NO venting to atmo..
If there is venting the engine could be recieving un-metered air and NOT idle properly..

 

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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Wed Jul 18, 2012 10:45 pm 
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My car is an el, I was under the impression that the tb should suck any fumes from the rocker, not the rocker be sucking, could there be that much vacuum coming through the PCV?

 

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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Thu Jul 19, 2012 7:28 pm 
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Ok, so the vacuum was caused by the pcv, i disconnected that and blocked up the manifold side so it was inoperable and that makes no difference to the idle issue.

What makes the motor idle high when you pull up to a set of lights? Usually it used to sit a few hundred higher for a few seconds when i stopped than dropped down to the normal idle, what would stop that from happening?

 

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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Thu Jul 19, 2012 10:45 pm 
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Is the ISC and TPS set correct ???
Any fault codes..??

 

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Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Thu Jul 19, 2012 11:02 pm 
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How do you set isc? Tps voltage at .975 ish

 

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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Thu Jul 19, 2012 11:16 pm 
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PCV goes to intake manifold.
Rocker cover breather goes to t-body.
Done a self test yet?
I've seen a few cases of blown ISC drivers in EF/L EEC's but I'd check the actual ISC valve itself.
You cannot set an ISC valve itself but you can set the idle speed as described in the sticky.
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 Post subject: Re: cant get modified el xr8 to idle properly
Posted: Fri Jul 20, 2012 5:46 am 
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XR9UTE wrote:
PCV goes to intake manifold.
Rocker cover breather goes to t-body.
Done a self test yet?
I've seen a few cases of blown ISC drivers in EF/L EEC's but I'd check the actual ISC valve itself.
You cannot set an ISC valve itself but you can set the idle speed as described in the sticky.



How do I do a self test?

 

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