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Old 04-07-2012, 03:02 PM   Thread Starter #1
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Default Lower Octane Causing Idle Stumble

Trying to determine what's going on here. I usually run 93 in my car. However I wanted to experiment by trying to ween the car down to a lower grade. I put a little over a half a tank of 89 in my tank and I noticed the acceleration is slower. Also if the engine gets hot, from hard accelerations, the idle will stumble while sitting at a stop light. The kind of stumble that makes you think the engine is gonna die. I went back and topped it off with 93 the other day and I got back a little more power and the idle stumbling stopped, even after I ran the car hard.

Also does the knock sensor throw a code if its not working right? I wonder if it needs replaced.
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Old 04-07-2012, 03:55 PM   #2
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Default Re: Lower octane causing idle stumble

Same thing happened with my 07 a while back. I always ran 93 and one day I tried 87 and it did the same thing but I just stuck with 93 since then.
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Old 04-07-2012, 04:21 PM   #3
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Default Re: Lower octane causing idle stumble

There's a reason why premium is recommended. I was getting the idle stumble using the 93 octane, but when my car was in at the dealership this last time, I asked them to take a look at that along with the other problems I was having. I'm not sure what they did, but the stumble is gone. I've only ever used 93 octane since I bought the car. Every now and then I'll throw a bottle of fuel system cleaner into the tank with a fillup. I use the LUCAS fuel treatment...
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Old 04-07-2012, 06:01 PM   #4
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Default Re: Lower octane causing idle stumble

93 Ahhh you east coast people are lucky. We top out at 91, so I put 89 in it and occasionally throw an octane boost in there. The performance is fine and it doesn't run any different between the 89 versus the 91. I get the stumble when I first start up for the day but after that it's fine.
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Old 04-08-2012, 01:49 PM   #5
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Default Re: Lower Octane Causing Idle Stumble

I have run nothing but 87 since I bought my car new and 119,000 miles later no issues and still get 23mpg avg.
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Old 04-08-2012, 01:58 PM   #6
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Default Re: Lower Octane Causing Idle Stumble

The reason this is happening is because your engine has become accustomed to 93, if you want to switch to a lower gas, you would need to go to autozone or auto parts store and buy gas flush liquid, put it in your gas tank and drive till your tank is empty this cleans your tank out of any 93 that might be there and then you can put w.e you want and it'll be fine
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Old 04-08-2012, 03:07 PM   #7
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Default Re: Lower Octane Causing Idle Stumble

I always use 91 because that is the highest octane available to me. I have one gas station that offers 93 but it's over 4 bucks, not thank you. The day I pay 4 bucks to gas up my car is the day I sell the mofo. Once I accidentally put 87 and the car ran fine, no idle issues .
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Old 04-08-2012, 03:09 PM   Thread Starter #8
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Default Re: Lower Octane Causing Idle Stumble

So either I have some carbon build up that's causing predetonation or the knock sensor isn't adjusting to the lower octane. Maybe it's time for seafoam.
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Old 04-08-2012, 03:31 PM   #9
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by Cheeto View Post
So either I have some carbon build up that's causing predetonation or the knock sensor isn't adjusting to the lower octane. Maybe it's time for seafoam.
How many miles you got bro? Higher octane is only recommended not mandatory.
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Old 04-08-2012, 04:28 PM   Thread Starter #10
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by RAZ76 View Post


How many miles you got bro? Higher octane is only recommended not mandatory.
123,900
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Old 04-08-2012, 06:24 PM   #11
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by RAZ76 View Post
I always use 91 because that is the highest octane available to me. I have one gas station that offers 93 but it's over 4 bucks, not thank you. The day I pay 4 bucks to gas up my car is the day I sell the mofo. Once I accidentally put 87 and the car ran fine, no idle issues .
Hey Raz, you're lucky out there in OKC! In the ATL here, my local fillup station is $4.00/gal. regular!!! Premium is $4.30. Man, in the FX it's recommended (yes, recommended not mandatory) premium, so at those prices, guess who's running mid grade? No problems yet, but I don't WOT either, sooo......

BTW- ATL has 93 octane premium, 91 mid, and 89 low octane....You think the lower octane messes up VQs short or long term???
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Old 04-08-2012, 06:47 PM   #12
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Default Re: Lower Octane Causing Idle Stumble

Yep gas is high in NC also 93 is $4.19 it cost me $60 bucks to fill up . I have been on the bike as much as I can .
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Old 04-08-2012, 07:16 PM   #13
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by conblac View Post
You think the lower octane messes up VQs short or long term???
Long, sometimes never if the car is taken care of.
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Old 04-08-2012, 07:27 PM   #14
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by Bassem92 View Post
The reason this is happening is because your engine has become accustomed to 93, if you want to switch to a lower gas, you would need to go to autozone or auto parts store and buy gas flush liquid, put it in your gas tank and drive till your tank is empty this cleans your tank out of any 93 that might be there and then you can put w.e you want and it'll be fine
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Old 04-08-2012, 08:08 PM   #15
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by Cheeto View Post
So either I have some carbon build up that's causing predetonation or the knock sensor isn't adjusting to the lower octane. Maybe it's time for seafoam.
You knock sensor will set a CEL code if it malfunctions. Also, on a side note, you knock sensor does not adjust the lower octane but rather sends a input signal to the ECM registering a detonation and then ECM pulls timing according to its timing tables until detonation is gone. If detonation still persist ECM triggers a misfire CEL.

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Old 04-08-2012, 08:14 PM   #16
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by Danski6MT View Post
You knock sensor will set a CEL code if it malfunctions. Also, on a side note, you knock sensor does not adjust the lower octane but rather sends a input signal to the ECM registering a detonation and then ECM pulls timing according to its timing tables until detonation is gone. If detonation still persist ECM triggers a misfire CEL.

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Bad knock sensor does not really throw a code. I only found out that mines was bad because I took off the lower intake manifold.

People tend to only notice when their performance starts to diminish a bit.
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Old 04-08-2012, 08:23 PM   #17
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Default Re: Lower Octane Causing Idle Stumble

I've used both. When I first got my Max all I ran was 87. It seemed to run fine. One day I decided to switch to premium, really for no reason,but the price difference is that much so I just kept using it.

BTW, I paid 4.59 for premium. It's down to 4.45 now.
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Old 04-08-2012, 09:11 PM   #18
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by EddyMaxx View Post
Bad knock sensor does not really throw a code. I only found out that mines was bad because I took off the lower intake manifold.

People tend to only notice when their performance starts to diminish a bit.
In some sence, you're correct Eddy. But don't forget that P0327 Is a knock code and it does get thrown....

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Old 04-08-2012, 09:15 PM   #19
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by Danski6MT View Post
In some sence, you're correct Eddy. But don't forget that P0327 Is a knock code and it does get thrown....

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I wasn't disagreeing bro. Just an fyi from my experience and a few cars I've work on. They all had bad knock sensors.
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Old 04-08-2012, 09:21 PM   Thread Starter #20
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Default Re: Lower Octane Causing Idle Stumble

I'm going to change the knock sensor and put new intake gaskets while I'm at it. I'm also going to pour some seafoam down the spark plug holes and let it sit.
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Old 04-08-2012, 09:50 PM   #21
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by smittybizzle View Post
Yep gas is high in NC also 93 is $4.19 it cost me $60 bucks to fill up . I have been on the bike as much as I can .
It costs me $78 to fill up the 7th gen, and $70 to fill up my 6th gen, depending on what level of gas I have in the car at time of fill-up.

Originally Posted by Bassem92 View Post
The reason this is happening is because your engine has become accustomed to 93, if you want to switch to a lower gas, you would need to go to autozone or auto parts store and buy gas flush liquid, put it in your gas tank and drive till your tank is empty this cleans your tank out of any 93 that might be there and then you can put w.e you want and it'll be fine
Mistar axbert here got it cleared out. lol
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Old 04-13-2012, 11:34 PM   Thread Starter #22
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Default Re: Lower Octane Causing Idle Stumble

SUCCESS!! I spent about 4-5 hours installing a new knock sensor and replacing both upper and lower manifold gaskets. I cleaned as much oil and carbon out of the intakes as I could. I also sprayed into the valves themselves, so much so that I had to take the spark plugs out and turn the engine over for a few seconds. Good thing I did because a bunch of carbon cleaner shot out of the spark plug holes like a geyser. I found out my injectors were pretty clean by running cleaner through all the injectors using a 9 volt battery and a small syringe. After I put everything back together and let the car relearn its idle, I drove it around for 3 hours. I have better throttle response, more power and the car idles so smooth that you can barely tell the engine is running. I mean she really pulls when it hits the upper rpms unlike before. Basically what I'm saying is...I'M BACK BABY, I'M BACK
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Old 04-13-2012, 11:51 PM   #23
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Default Re: Lower Octane Causing Idle Stumble

Originally Posted by Cheeto View Post
SUCCESS!! I spent about 4-5 hours installing a new knock sensor and replacing both upper and lower manifold gaskets. I cleaned as much oil and carbon out of the intakes as I could. I also sprayed into the valves themselves, so much so that I had to take the spark plugs out and turn the engine over for a few seconds. Good thing I did because a bunch of carbon cleaner shot out of the spark plug holes like a geyser. I found out my injectors were pretty clean by running cleaner through all the injectors using a 9 volt battery and a small syringe. After I put everything back together and let the car relearn its idle, I drove it around for 3 hours. I have better throttle response, more power and the car idles so smooth that you can barely tell the engine is running. I mean she really pulls when it hits the upper rpms unlike before. Basically what I'm saying is...I'M BACK BABY, I'M BACK
Congrats. Glad you got her fixed up.
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