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Old 06-09-2004, 06:57   #1 (permalink)
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Rough Idle On Ef

Hey guys, I was wondering if anyone has any ideas on what may be wrong with my ef. The idle is surging 90% of the time and is worse with air con on and/or if it is in gear(auto). There are no other problems while driving only when stationary. I have a stage 2 crow cam with vernier gear set that were fitted about 12 months ago. These caused some mild surging however it has got progresively worse to the point that it almost stalls. So far I have only swapped the idle control switch that is bolted on the throttle body but if anything made it worse so I put the original back on. Thanks in advance for any thoughts/comments.
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Old 06-09-2004, 22:52   #2 (permalink)
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Re: Rough Idle On Ef

Sounds like a vacuum leak. Check the O rings on the injectors and replace them. It is uasual to need to replace them after 100,000 klicks. Not really hard to do, its a 2 to 3 hr job for a competent home mechanic.
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Old 06-09-2004, 23:11   #3 (permalink)
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Re: Rough Idle On Ef

Vacuum leak would usually make the car idle high rather than nearly stall. Have you tried adjusting base idle - was the ICS that you put on brand new? If it was from a wrecked car then it could need cleaning.
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Old 06-09-2004, 23:25   #4 (permalink)
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Re: Rough Idle On Ef

Or with the cam a lack of vacuum
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Old 06-10-2004, 00:18   #5 (permalink)
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Re: Rough Idle On Ef

Mate had a same symptoms with his EFII - all standard. It was a inlet manifold gasket leak.
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Old 06-10-2004, 00:27   #6 (permalink)
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Re: Rough Idle On Ef

Has the idle switch been reset properly?? As the book states.
You cant just go slap one on & wind the revs up without affecting something else elsewhere.
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Old 06-10-2004, 05:43   #7 (permalink)
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Re: Rough Idle On Ef

Firstly, Clean the ISC (see fordmods.com).
Still no good? Do the check for air leaks.
You'll need a can of butane(?) or was it Meathane... I think its the latter.
You then spray it around the inlet (whilst car is idling). If the car suddenly idles clean and smooth again, then rough... you know some extra air is getting in around the inlet gastket.

Mine died about 8 months ago. Its a fun job to replace, the bolts up the back underneath can go f themselves!

Good luck.
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