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AU1 Runs Rough on Regular Unleaded 


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 Post subject: AU1 Runs Rough on Regular Unleaded
Posted: Mon Aug 20, 2012 7:23 pm 
Stock as a Rock

Age: 34

Posts: 157

Joined: 20th Nov 2004

Gallery: 13 images

Ride: 2008 BF MKII SR

Location: Brisbane
QLD, Australia

A while ago my AU1 Falcon began running rough whenever I filled the tank with regular unleaded (91 octane I think). The problem was most noticeable when taking off. There was very noticeable shuddering and hesitation. Switching to premium unleaded (95 octane) fixed the problem. It seems strange that a car designed to run on regular unleaded petrol would all of a sudden run rough on it.

Does anyone have any ideas?
 Post subject: Re: AU1 Runs Rough on Regular Unleaded
Posted: Wed Aug 22, 2012 8:46 pm 
Fordmods Newbie

Posts: 17

Joined: 21st Feb 2012

Location: Adelaide
SA, Australia

Here is a little story about my au tickford 6I fairlane.

Ran fine around Adelaide and country, but when towing a caravan and after first top up after entering Vic or NSW car would ping its head off on heavy acceleration or pulling big hills, the only thing that would help was using 98 octane fuel.

I did 3 trips and some 15,000 in three separate trips over 18 months with the same issues.

The only other issue was a slight miss on a cold morning if the car was parked on grass over night.

Then one day the coil failed, replaced coil and leads and while doing that also changed fuel filter.
Have done two more trips since and no more issues, not sure if it was the coil cross firing under heavy load or the old fuel filter couldn’t supply enough fuel and causing a lean state

Plugs and leads would be a good place to start
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