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Old 20-03-2015, 02:57 PM   #1
xr8 007
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Default Another rough idle issue,,kinda

Hi all,

Got a SII Fairmont. Recently put a new alternator in which charges correctly according to my volt meter, on full and no loads etc.

However when stopped at lights, it develops a light rough idle under load when I have lights on, demister and heater/air con on etc. Is hard to describe because the idle itself is fine however it causes the car to give off a light vibration.

If alternator is charging correctly, what other things can I look out for? I have cleaned the throttle body and IAC valve and also changed the spark plugs.

Fuel mileage is perfect and spot on so my oxy sensor should be ok also.


Or am I expecting to much out of a 15 year old car? Expecting it to work like a brand new FG?
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Old 20-03-2015, 05:06 PM   #2
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Default Re: Another rough idle issue,,kinda

Hi xr8 007, i would probably check all bolt on's are bolted snug & tight under the bonnet & under the car especially the exhaust & cat. Good luck!

cheer's, Maka
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Old 21-03-2015, 10:26 PM   #3
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Default Re: Another rough idle issue,,kinda

Engine idle reset?

https://youtu.be/kN8Z5jOl2WQ?list=UU...0EW8-YuKL9a9VA

Mine runs like an FG....ONLY LOUDER!!!!!!!!!!!!!!!!
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Old 22-03-2015, 04:35 PM   #4
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Default Re: Another rough idle issue,,kinda

thanks dudes, will have a look.
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Old 14-07-2015, 09:53 PM   #5
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Default Re: Another rough idle issue,,kinda

So still having this issue even aftef ecu reset. Interesting that there was a slight improvement at the start but the issue is back. Any other suggestions??
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Old 14-07-2015, 10:40 PM   #6
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Default Re: Another rough idle issue,,kinda

try tightening the bolts on your TPS.
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Old 15-07-2015, 02:22 PM   #7
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Default Re: Another rough idle issue,,kinda

Long shot xr8 007, but is the battery the right amperage? Also have a suss of your inlet manifold bolts & clean your ics valve on the throttle body. If all fails consider getting a ecu scan to see if everything is all good sensor wise. Good luck!

cheer's, Maka
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Old 30-07-2015, 10:25 PM   #8
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Default Re: Another rough idle issue,,kinda

If its only happening under load should be power related. Coil pack, check HT leads. Could be battery failing. But it wouldn't hurt to make sure the idle control on the throttle body is definitely clean and working. Pull it out of the car and clean it out properly if you didn't already.
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