22 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHEngine check light
Leading reported evidence
Disconnect battery
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed · Original poster
On my Subaru liberty, when I disconnected the battery, it forgot how to idle the car, which caused me a heart attack until I googled it and google said yes the engine management forgets idle condition, go drive the car around for a while for it to reset.
Leading evidence: 'Disconnect battery' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check lights' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
But I've had the sudden rough idle before, but no engine check lights.
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Suggestion
yep, I was more suggesting being careful - like disconnecting the battery etc
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Suggestion · Original poster
My liberty won't even idle in the driveway after a battery disconnect, I had to rev it up manually to keep it running, silly thing.
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Performed · outcome unconfirmed · Original poster
On my Subaru liberty, when I disconnected the battery, it forgot how to idle the car, which caused me a heart attack until I googled it and google said yes the engine management forgets idle condition, go drive the car around for a while for it to reset.
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22 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Forum Australia: 1 discussions
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Outcome without a verified action link
ECU didn't like things for a second or two then all went back to normal.
So I was idling at the lights this morning, idle idle.
Then the car started running a bit rough.. just noticed it.
Then the Check Engine light came on!
lights turned green, I drove off looking at this Check Engine light... then it went off.
Hmmmmm.
What? what? What should I do?
Atm I am thinking maybe the fuel injectors might be a bit gummy and I should throw in a bottle of injector cleaner.
Or could it be because I pulled into a petrol station and it was out of 98 octane and I 1/2 tank filled with 95 Octane?
But I've had the sudden rough idle before, but no engine check lights.
my suggestion would be to plug it into a diagnostic computer and find out... CEL is the most non descriptive of lights! it could be any number of things from an O2 failure to something electrical
Please keep us updated Orion. According to the IMS diagnostics this can sometimes be and indicator of imminent IMS failure with the cam sensors reading themsleves being out of alignment. Good luck...lucky for warranty.
So I took my car into Porsche Center Melb this morning, and they hooked it up to the computer, misfire on 2nd cylinder was recorded.
Spark plugs were changed in Oct 2013..... could be the coil packs......
I got sent on my way with "nothing serious, let us know if it happens again and we'll keep the car for 2 days and diagnose more"
Simple. take one coilpack out, swap it with another cylinder and when the engine light comes on again. get it checked. if the cylinder changed with the same coil pack. That's the problem.
Yup... funny enough I have not jacked up my car yet!
I've put some injector cleaner into the tank, lets see if it's a sticky injector.
And yes I'll think about jacking up the car to look at the tail..
Hey I bought a Porsche so I don't have to get under the car !
lol
I spent so much time with my Elise in pieces and up on stands that I went for a 997C2 hoping that I wouldn't have to jack this one up.
yes i am now realising that this is not reality.....
Great advice from Pauly first up so follow it if you can.
If you did just fill up with any sort of fuel just beforehand then my solid bet is that there was some minor discrepancy with that given that it the CEL was only on for a moment. ECU didn't like things for a second or two then all went back to normal. I've seen a fair few CELs come on just after filling up If the CEL wasn't flashing then its not in the 'catastrophic' category.
Dont jump the gun and assume the worst (IMS) when one small thing occurs. Cars can be temperamental things remember, even 2nd hand 911s!
Enjoy your car
I've got my bet on fuel quality, and fuel filter and particles in the injectors, which is why I put in a bottle of injector cleaner.
We'll see how we go.
ah I get you.
But...
On my Subaru liberty, when I disconnected the battery, it forgot how to idle the car, which caused me a heart attack until I googled it and google said yes the engine management forgets idle condition, go drive the car around for a while for it to reset.
Any such hidden goodies in the 997 if I disconnect the battery for a while?
I'd say so, most current ECU's learn from conditions and reset to base when the battery is disconnected
easy way to sort it out on most cars
idle for 5 minutes
idle for 5 minutes with A/C and headlights on so it has a 'load'
if an auto do the above in both drive and park (with the park brake on obviously)
then go for a drive and see how it behaves
I've found it's much easier to do the above than drive around wondering if the thing is going to stall at the lights 'cause it's maps are all back to base
