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EF missing on idle once warmed up 

 

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 Post subject: EF missing on idle once warmed up
Posted: Thu Apr 30, 2009 12:31 pm 
Getting Side Ways
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Ride: EF Gli Ghia, XP Fairmont

Location: Perth
WA, Australia

Have replaced plugs, leads and coil pack. Once it is warm it missings pretty bad while idling at lights etc, otherwise runs fine while driving and still gets great milage.

What would be the next things to try replacing?

Or does someone have a diagnostic module close to perth city I could use?

Thanks.

 

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 Post subject: Re: EF missing on idle once warmed up
Posted: Thu Apr 30, 2009 1:13 pm 
Smokin em up
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Ride: Fairlane Concorde 4.0

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How long since your injectors were serviced/replaced? Could have a dirty one that isn't showing up when cold (longer injector on time) but shows itself when things are a bit leaner (eng warm).
If it idles well when cold, that would probably rule out any problem with the ISC. It would idle crap all the time if the isc was gummed up.

 

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NF Fairlane: Non Factory Dual Fuel - New coolant tank, New fuel injectors, New fuel pump, New earth cable, ECU capacitors replaced, New O2 sensor, leads and plugs, New Radiator/Condensor cleaned. 483,000kms. AU I6 Powered. Struts, Shockies, Tie rods and ball joints replaced.

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 Post subject: Re: EF missing on idle once warmed up
Posted: Thu Apr 30, 2009 1:39 pm 
Getting Side Ways
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injectors are original and never been serviced .. would a diagnostic show up a faulty injector if that were the problem ?

 

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FACT: "Chuck Norris owns the greatest Poker Face of all-time. It helped him win the 1983 World Series of Poker despite him holding just a Joker, a Get out of Jail Free Monopoly card, a 2 of clubs, 7 of spades and a green #4 card from the game Uno."

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 Post subject: Re: EF missing on idle once warmed up
Posted: Thu Apr 30, 2009 2:18 pm 
Smokin em up
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Diagnostics will not show up a dirty injector. An oscilloscope can sometime show an increased mark to space ratio (on time versus off time) as the ecu attempts to compensate for poor injector spray patterns. The only way to check an injector is to have it tested on a flow bench. Most people just do an exchange set thru Bursons or similar. Works out roughly $30 each exchange. Also Ebay do exchange sets (and new occasionally) for a little less.

I can't guarantee this is the cause of your rough idle but it is something that should be done on a regular basis to keep your car in good shape.

 

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NF Fairlane: Non Factory Dual Fuel - New coolant tank, New fuel injectors, New fuel pump, New earth cable, ECU capacitors replaced, New O2 sensor, leads and plugs, New Radiator/Condensor cleaned. 483,000kms. AU I6 Powered. Struts, Shockies, Tie rods and ball joints replaced.

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 Post subject: Re: EF missing on idle once warmed up
Posted: Thu Apr 30, 2009 3:59 pm 
Getting Side Ways
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$30ea injector or for the whole 6?

Might anything else could be causing it - something cheaper ;)

 

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 Post subject: Re: EF missing on idle once warmed up
Posted: Thu Apr 30, 2009 4:36 pm 
Smokin em up
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Quote:
Works out roughly $30 each exchange


Well you've done some of the basics already (plugs, leads and coil pack). Check your electrical system (voltage drops across earth/battery cables under load and alternator output) to see if you have any resistive cables from chassis/engine, battery/alternator, battery/engine etc. Do a diagnostic check for codes. If you have a vacuum gauge, check for vacuum hose leak around the inlet manifold/hoses at the rear of engine bay. Vacuum leak at Inlet manifold gasket joints also possible.

Thats about it for the basics.

 

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NF Fairlane: Non Factory Dual Fuel - New coolant tank, New fuel injectors, New fuel pump, New earth cable, ECU capacitors replaced, New O2 sensor, leads and plugs, New Radiator/Condensor cleaned. 483,000kms. AU I6 Powered. Struts, Shockies, Tie rods and ball joints replaced.

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 Post subject: Re: EF missing on idle once warmed up
Posted: Thu Apr 30, 2009 8:50 pm 
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replace the o rings and injectors for a start.

check for vac leaks and maybe a blown intake gasket

 

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