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revs a lil jumpy at idle 

 

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 Post subject: revs a lil jumpy at idle
Posted: Tue Feb 07, 2012 8:23 pm 
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Hey guys, when at idle in park or N, my revs are a little up n down, when in park it sits a bit lower than 750, more like 650, coils?
also is it normal to feel your engine shake from time to time whilst at idle, feel it in the seat, like a lil jolt every 5 secs.

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 12:32 pm 
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I have an EF that's a bit lumpy on idle.
It's fine once underway - very smooth.
None of the mechanics have mentioned it being a problem, but it's not as smooth as I would have thought. My previous car, a little Pulsar, was smooth as.

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 6:01 pm 
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ba_xr6bw wrote:
Hey guys, when at idle in park or N, my revs are a little up n down, when in park it sits a bit lower than 750, more like 650, coils?
also is it normal to feel your engine shake from time to time whilst at idle, feel it in the seat, like a lil jolt every 5 secs.


it might have something to do with your custom tune, hunting up and down can be from your idle afrs being to lean or to much timing at idle.. but thats only if the idle was touched with your tune???
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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 7:09 pm 
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I spoke to joe and he said he didn touch the idle revs.

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 7:12 pm 
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take it to joe and ask his opinion on what it is, its hard to diagnose a problem over the internet.. we can only guess... :)
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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 7:16 pm 
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Sweet dude, how long does a diagnosis scan usually take? Is it costly?

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 7:35 pm 
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I have exactly the same issue with my car.
SWC told me that the CMS cam(s) are renowned for hunting heaps at idle.
So, I'm not sure that it can be fixed, providing your car is cammed with a CMS kit.

I've too been told by a work mate that nearly all the guys he knows that have a cammed Falcon have the same issue.

Does your car hold onto revs as well, when in neutral or park?

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 7:45 pm 
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Mate I haven't touched my cams. And I don't plan to.
It got nothing to do with cams. It's only occurred after my dyno tune.
No it doesn't hold 750 rpm in park.

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 7:56 pm 
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does it happen when it's warming up or when the engine is at running temperature?

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 7:57 pm 
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ba_xr6bw wrote:
Mate I haven't touched my cams. And I don't plan to.
It got nothing to do with cams. It's only occurred after my dyno tune.
No it doesn't hold 750 rpm in park.

Fair enough, then obviously it's something else...

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 8:00 pm 
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BEAR80 wrote:
does it happen when it's warming up or when the engine is at running temperature?

Running temp!!

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 8:10 pm 
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ba_xr6bw wrote:
It's only occurred after my dyno tune.


theres your answer! and the cause!
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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 8:11 pm 
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have you changed what ron fuel you use or the addatives since the tune was done?

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 8:14 pm 
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TROYMAN wrote:
ba_xr6bw wrote:
It's only occurred after my dyno tune.


theres your answer! and the cause!


ba_xr6bw go and talk to company who did your tune

 

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 Post subject: Re: revs a lil jumpy at idle
Posted: Wed Feb 08, 2012 8:21 pm 
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flogging a dead horse here, we all know hes just going to tell us we arent mechanics, and then go pay one to diagnose the problem

If you dont already run a higher octane fuel try that first, as the timing would of probably been advanced to get the most out of the better petrol...

 

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