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4.0L slow to drop revs 

 

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 Post subject: 4.0L slow to drop revs
Posted: Wed Apr 27, 2005 6:31 pm 
Oompa Loompa
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Has anyone had any problems with engine revs taking ages to go down? ie: rev to 4000rpm in neutral and it takes ages to get back down to idle? just wondering if its just an injected engine thing, or if its not normal an i need to get it checked out. its really annoying-effects gear changes (its manual) and driveability of the car

 

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Posted: Wed Apr 27, 2005 6:33 pm 
Getting Side Ways
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check the throttle cable

it may be fraying and catching against the outter insulation

 

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Posted: Wed Apr 27, 2005 6:46 pm 
Getting Side Ways
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Is yours modded much???
Cause I have the same thing and I think its because of a vacuum problem. A vacuum canister should fix it.

I know its because my cam is pretty lumpy, but there could be something else behind it...Jonno said something about the idle control sensor???

Sorry that i can't help you much.

 

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Posted: Wed Apr 27, 2005 7:00 pm 
Oompa Loompa
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ill check the throttle cable this weekend.

nah i dont have many mods at the moment. only mods are exhaust and larger air intake so shouldnt have any effect on it, plus it was doing it long before i did anything to it.

 

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Posted: Wed Apr 27, 2005 7:38 pm 
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Idle speed controller. the thing on top of the throttle body. it has a black plug going to it. disconect the plug (while the engine is warm) and see if the problem goes away. Had the same prob in my mates i6, ended up we just left the ISC disconnected permantly (cleanig the bastard didnt help either)

 

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Posted: Wed Apr 27, 2005 7:41 pm 
Getting Side Ways
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Yep, sounds like the ISC.

Try disconnecting it, see how it goes. If it wont idle then you'll have to adjust the base idle. Prolly more important for autos...

 

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Posted: Thu Apr 28, 2005 4:08 pm 
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Yup.. ISC.

I have disconnected mine in my EL manual because its a pain in the a** to drive when the revs don't drop quick enough

 

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Posted: Thu Apr 28, 2005 6:44 pm 
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dammit, and here i was thinking I was special.

 

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Posted: Thu Apr 28, 2005 7:56 pm 
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Hey,

Try cleaning our your Idle Control Solenoid
located on top of the throttle body
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Posted: Thu Apr 28, 2005 8:13 pm 
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could also be a leak in your plenum chamber manifold.. but more than likely the ISC
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Posted: Thu Apr 28, 2005 8:56 pm 
Oompa Loompa
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ok, next stupid question: how do i adjust the idle? :oops:
ive fiddled with the black knob on the throttle body, but didnt seem to change anything

 

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Posted: Thu Apr 28, 2005 8:59 pm 
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dzynafalcon wrote:
ok, next stupid question: how do i adjust the idle? :oops:
ive fiddled with the black knob on the throttle body, but didnt seem to change anything


look over the back of the TB - you'll see the throttle cable, with a screw under it - thats the base idle screw! :wink: adjust it up or down how you need to! 8-)

 

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Posted: Thu Apr 28, 2005 9:03 pm 
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the black thing on the ISC isn't an adjuster its a valve Im pretty sure.


Cheers

 

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Posted: Thu Apr 28, 2005 11:20 pm 
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ive been driving with my isc disconected for the last few days now, and its much easier to drive. no more hunting at the traffic lights, revs drop while changing gears. just a bit tricky first thing in the morning, but ill just have to put up with it for now
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Posted: Fri Apr 29, 2005 12:29 am 
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how hard is the throttle cable to change?? was just goin to change it cos the plastic coating on the outsode is goin all s**t and its fraying a little near the throttle body.... and any idea how much they are......

 

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