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2007 forester SG manual
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24 Posts
Discussion Starter #1
Hi Guys,

for several months my car, when idling will surge from ~750 RPMs to ~1200 then drops to almost stall, then recovers back to 750 -this occurs about every 25 seconds , see linked video for rev counter footage -
Today the car has started actually stalling when the revs drop.
Car has had new plugs, oil change MAF sensor clean, issue occurss when cold or at normal temp
Anyone got any thoughts of where to investigate ?

Cheers
Al
 

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2007 forester SG manual
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24 Posts
Discussion Starter #3
Hi Bobby,

Thanks for the suggestion, I should have mentioned that i tried that when i swapped the plugs, but i will try it again at the weekend

Regards
Al
 

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2007 forester SG manual
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24 Posts
Discussion Starter #4
Just to muddy the waters - before i got a chance to relearn the idle, i've now got a CEL - P0030 HO2S heater control circuit low bank 1 sensor 1
Could this be the root cause of my idling issue ?
 

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2007 Forester Sports XT 4EAT
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2007 forester SG manual
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24 Posts
Discussion Starter #7
Finally got round to replacing the O2 sensor a couple of weeks ago which seemed to resolve all my issues, but the eratic idle has now returned, but without the stalling
Any more suggestions ?
 
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