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rough idle 

 

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 Post subject: rough idle
Posted: Sat Nov 24, 2007 6:19 pm 
Getting Side Ways
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my sister has a EF which the idle is rough and keeps surging and slow for the revs to come down to idle ,changed all sensors and its was slightly better but getting bad again ,plugs and leads are new too ,have heard its a common problem is there any way to fix this.
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Posted: Sat Nov 24, 2007 9:26 pm 
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Have you clean the ISC?

 

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Posted: Sun Nov 25, 2007 9:57 am 
Getting Side Ways
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changed and cleaned am stuffed to know why it runs this way the car just shakes at idle would a computer reset help maybe ,even changed the engine mounts.
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Posted: Sun Nov 25, 2007 10:34 am 
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I've been trying to diagnose this problem for months now.. so far i've replaced the isc and oxy sensor and disconnected the isc and upped the idle - the problem still occurred.

The interesting thing i've found is that it doesn't seem to happen all the time - or sometimes its not as bad. I recently had my head gasket replaced and when i got it back after a few days the car ran sweet as for a day or so and gradually got worse till it had degraded back to running like absolute crap.
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Posted: Sun Nov 25, 2007 12:40 pm 
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Was wondering, when was the last time you had your injectors serviced. if an injector is leaking it can cause a rough idle. You will notice that when it comes to starting your car first thing in the morning, the fuel pressure has dropped over night cos of leaking injector. It would cause the car to take a little bit more to crank then normal. Cos one cylinder flooded.

But once your going, it gets easier to start for a while. Service your injectors and go from there.

Just an idea.

 

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Posted: Sun Nov 25, 2007 2:19 pm 
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I have my ef xr6 converted to dual fuel - the problem seems to happen on lpg aswell.

Is it possible that a leaky injector would affect the mix when on lpg and the injectors are cut off?

Also to service them - do i just put an injector cleaner through them or take them somewhere for a service?
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Posted: Sun Nov 25, 2007 4:04 pm 
Getting Side Ways
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ummmm mine was fixed by injectors and fuel pump :)

 

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Posted: Sun Nov 25, 2007 9:15 pm 
Getting Side Ways
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will get injectors cleaned next then fuel pump is new allready.
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Posted: Sun Nov 25, 2007 10:31 pm 
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If an injector is leaky it will cause problems on Lpg OR Petrol, as it is letting in fuel regardless of power being applied to it. This will cause a rich mixture. If you want to test this, unplug your fuel pump at the boot, and relieve the fuel pressure under the bonnet. Run it for a few days without fuel (if the LPG will start without it) and see if this helps.

BTW, Fizzer, timing gun is now fixed ;-)

 

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Posted: Mon Nov 26, 2007 1:39 pm 
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unless he had injected LPG.. then a leaky injector wouldn't be the problem.

I've got a dual fuel EB. I put shims in the HLA's after a re-grind and it started doing it. Idle was terrible and it would drop and surge or 'hunt' as some people describe it.

Anyways, took out the shims and it went back to normal.. I think it's more likely to be a vacume leak perhaps. It's never really idled the best since putting in the cam..

 

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Posted: Mon Nov 26, 2007 5:02 pm 
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I'm talking about the petrol injectors only. I don't see how injected lpg can stop a petrol injector from leaking unless they are a complete replacement for the petrol ones - but his is dual fuel. Can you explain how injected lpg differs?

If its leaking without power, its capable of leaking continuously, therefore providing a rich mixture on both lpg or petrol, regardless of how the lpg is getting in there.

 

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Posted: Mon Nov 26, 2007 11:05 pm 
Getting Side Ways
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there is a thread a guy came up with about changing a few caps in the ecu. apparently something to do with the caps having a smoothing effect on what the isc does as not to raise the idle way to quick

if it makes you feel better, got a mate, ef, with the same prob. he's been told its got something to do with a faulty ecu. so thats what i think it is

 

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Posted: Tue Nov 27, 2007 7:46 pm 
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hey have same prob mine hard start. rough idel, surging changed plugs ,leads,coil pack,fuel,air filter no difference looking around this site i have sorta come to the idea it has blown headgasket but donsnt loss water so im stumped
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