Question about 1993 Ford Explorer Limited

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Octane adjustment service pin open. what does this mean?

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SOURCE: Octane adjust service pin on

it means octane adjust (oct adj) out of self- test range

Posted on Aug 22, 2010


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Hi, I have a 2009 Husqvarna TE 250, spec states the engine as 12.9:1 compression ratio. The question I have, is what octane fuel rating is recommended for this bike? Thanks, Rob

91 or 95 octane is suitable for 9.5-10.5 ratios ( most engines)
for 12.9 you will find that it runs best on 98 octane
it may be good on 95 octane but generally the higher the compression ratio the higher octane rating
discuss the octane rating required with the bike service agent/service center

Apr 02, 2017 | Cars & Trucks


Why to Use a fuel with the lowest required octane in the car?

Low-octane "regular" gas is usually all that is required. Octane is only a rating of the fuel's resistance to engine-damaging pre-ignition ("knock") in high-performance engines (that few people have). Low octane gas is less expensive and a better value if that's all your engine requires. Best case scenario you're wasting money by filling up with a higher than recommended grade of gas. Worst case scenario that high octane fuel is building up damaging carbon deposits in your engine because it's not being burned as completely as lower octane fuel would be. Check your owner's manual to be sure. Modern high performance cars will sometimes recommend higher octane fuels because they are engineered to use those fuels. The use of lower than recommended octane will not make your car explode, the ECM (Engine Control Module, aka:computer) will adjust the fuel injectors and spark timing to save the engine and compensate for you cheaping out at the pump. Those adjustments will consist of retarding the spark (reducing power and efficiency) as well as dumping lots of extra fuel into the cylinders to cool them, potentially costing you more than getting mid grade or premium IF that's what your car requires. NOTE: Remember that engines need less octane at higher altitudes. If your engine does not "knock" on regular, paying more for a higher octane rating is a waste since the increased octane makes no significant improvement to gas mileage and it is no better for your engine. All available fuels have detergent and additive packages. This will help.good luck.

on Mar 08, 2010 | Toyota Prius Cars & Trucks

1 Answer

What petrol can I use

wow I get this question a lot especially when the prices for it go up and up , "what grade fuel can I use in my car?"

well this requires a quick lesson in "grades"

grades mean how much of a component in fuel called Octane is added (this is why it costs more) , octane is a simple way of saying how Hot it will burn In my car , simple one cylinder engines can run on just 12 octane and airplanes run on 110+ octane , your car is gonna be in the middle someplace , now lots of mfg tell you have to run fuel that is "this number" and nothing else this is because the ign system and emissions systems have been factory set for that amount , but now a trend of lately is for cars to run variable fuel this means car uses its computer to adjust itself to what ever fuel you add to it (with in a range) as for the simple answer I can give is run a fuel that makes your car perform to your liking and driving habits

Nov 21, 2015 | Cars & Trucks

1 Answer

My 72 beetle drives fine, but it is making a "clucking" sound when i accelerate. Any ideas?

buy the highest octane gas you can find. what you describe is valve knock due to pre ignition which is created by the lower octane gas (87 octane) I used to mix race fuel (105 octane) with 93 octane just for the heck of it, but that is totally uneccesary.

also check (or have checked)timing and timing advance at higher rpm/load(when you accelerate), very important on that little motor

make sure valves are adjusted properly too

Those motors run like a champ with frequent "tune ups" which include: point gap adjustment, timing check, timing advance check, and proper valve to rocker clearance>>>> used to be basic stuff, now it's a lost art........

good luck

Jan 05, 2011 | 2000 Volkswagen Beetle

1 Answer

For 2005 mitsubishi outlander which octane (87, 89 or 91) should be used?

lower octanes will not hurt your 2005 outlander truck at all... the engine computer adjusts to the lower octane... you may notice a slightly higher fuel consumption with the lower octane fuel but the money you save on lower octane fuel offsets the mileage.

Jul 28, 2010 | 2005 Mitsubishi Outlander

1 Answer

My 06 Navigator calls for premium 91 octane gasoline... But I have used Regular 87 octane and can feel no difference in performance of any kind. Am I hurting my truck?

You are not hurting your truck at all... the engine computer adjusts to the lower octane... you may notice a slightly higher fuel consumption with the lower octane fuel but the money you save on lower octane fuel offsets the mileage.

May 10, 2010 | 2006 Lincoln Navigator

1 Answer

1995 eagel talon engine code p1390

Octane Adjust Pin Out Of Self Test Range. This is a sensor fault.
I believe will run out after key cycle concludes.

Nov 28, 2009 | 1995 Eagle Talon

1 Answer

My celico has knocking noise from top part at 1000revs

If it is not the valve tappet adjustment, it could be intternal, like a defective piston pin or stuck valve that gets hit by the piston on each upward stroke. Or it could fuel, try to set the proper octane setting for the engine according to octane rating of the fuel being used. How about spark plugs ? It could be too long than the original. I need more info on this.

Oct 27, 2009 | 2002 Toyota Celica

2 Answers

Knocking on petrol

its pinking which means the timing is too far advanced ,try 98 octane petrol .what year is vehicle as older engines were designed to run on higher octane a MK2 jag or austin westminster need 101 octane.whats happening is the petrol has a lower anti knock additive than higher octane ,although the petrol is the same flame rate of burn its the amount of anti knock additive which gives it its octane value.just check timing and if a distributor is fitted ****** it a bit i would suggest 8 btdc but if still pinks on low grade then 6btdc

Nov 21, 2008 | Daihatsu Charade Cars & Trucks

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