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Misfire after redline sl1 #5312911 01/04/20 08:10 AM
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D1dad Offline OP
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Just like the title says. I ran a bottle of sl-1 through and after I ran the whole tank and refueled, I got a p0300 code for random misfire. Coincidence or is this somewhat normal? The car is an 08 impala 3.9 with new plugs and wires 5k ago. No abnormal idle and car runs smooth and fuel eco is normal. I cleared the code and will see if it returns.

Re: Misfire after redline sl1 [Re: D1dad] #5312925 01/04/20 08:23 AM
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atikovi Offline
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Probably means it's working, burning up stuff and causing temporary misfire codes.

Re: Misfire after redline sl1 [Re: D1dad] #5312999 01/04/20 09:37 AM
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D1dad Offline OP
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Probably. I pulled the front plugs and caught a strong whiff of the redline.

Re: Misfire after redline sl1 [Re: D1dad] #5313049 01/04/20 10:56 AM
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Olas Offline
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I doubt it was the redline itself, misfires are coil/plug/lead related. maybe the plugs are temporarily fouling and cleaning off?


Cable ties should hold it
Re: Misfire after redline sl1 [Re: D1dad] #5313056 01/04/20 11:03 AM
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carviewsonic Offline
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I recently ran a bottle of sl-1 through my Honda, and my '05 Buick 3.8. I noticed with each car that they idled smoother immediately after refuelling to replace the sl-1 treated fuel. I think that sl-1 is a good cleaner, but that it might affect idle quality during the treatment. That's only one tank of fuel, so not a big deal.


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Re: Misfire after redline sl1 [Re: D1dad] #5313093 01/04/20 11:59 AM
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gathermewool Offline
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Redline SI-1 (pronounced Ess-Eye-One).

I've used it a bunch of times, but never noticed any change in idle quality, knock, etc. in my Subarus.


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Re: Misfire after redline sl1 [Re: D1dad] #5313233 01/04/20 03:00 PM
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D1dad Offline OP
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I just ran it 130 miles and all is well. I’m sure something came loose on a car with 117k on it.

Re: Misfire after redline sl1 [Re: D1dad] #5313281 01/04/20 04:05 PM
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Truckedup Offline
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I just put the redline in my 2002 Honda CRV...All was fine then after a 15 mile ride, a two hour shutdown, then a restart, the engine briefly refused to accept commands from the accelerator pedal..It just continued to idle...Then less than a minute, the problem cleared and never returned..Very odd... Random misfire codes can be igntion ,fuel delivery, valves sticking or not seating and various other causes...


World's second fastest vintage Triumph 650, 133 MPH
Re: Misfire after redline sl1 [Re: D1dad] #5314546 01/06/20 08:29 AM
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D1dad Offline OP
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Not redline but when I used kreen on my 09 altima the cel came on and then went away as it neared the bottom of the fuel tank. I pulle the plugs out and they were pretty nasty at only 30k so obviously something was amiss in the fuel system.

Re: Misfire after redline sl1 [Re: D1dad] #5315783 01/07/20 12:31 PM
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nicholas Offline
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Take er out for a 30-45 min highway drive with some full throttle pulls.................up to the speed limit of course.

Clear out the junk and get it good and hot!!!!!!!!!!1


2019 2.0T Santa Fe
2010 3.5 Santa Fe
Re: Misfire after redline sl1 [Re: D1dad] #5315912 01/07/20 03:07 PM
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Pew Offline
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It did the same to my focus both times I put SI-1 in it. After the tank was done and I filled it up again, the codes didn't come back.

Re: Misfire after redline sl1 [Re: D1dad] #5316062 01/07/20 06:35 PM
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D1dad Offline OP
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Yeah nothing since. I filled up at the sunoco that sells non ethanol 90 and the cars never ran better.

Last edited by D1dad; 01/07/20 06:36 PM.
Re: Misfire after redline sl1 [Re: D1dad] #5316066 01/07/20 06:39 PM
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D1dad Offline OP
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Idle is so smooth you can set a full shot on the dash and wouldn’t spill a drop. Impressive over the Lucas and Chevron I’ve ran in the past.

Re: Misfire after redline sl1 [Re: D1dad] #5316811 01/08/20 01:30 PM
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nicholas Offline
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Redline is the real deal - - - probably the best pour in fuel / combustion cleaner you can buy.


2019 2.0T Santa Fe
2010 3.5 Santa Fe
Re: Misfire after redline sl1 [Re: D1dad] #5318674 01/10/20 01:28 PM
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painfx Offline
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It smooths out my idle, no misfires.

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