Octane question.
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Postmaster
Joined: Dec 2003
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From: The County
Octane question.
A friend at work has a 91 Ford Explorer XLT.He claimes he can't use the super blend of unleaded gas because it spits and sputters if he uses anything but regular unleaded.I thought it was strange,so I posted this to find out what would make it do that.Is this possible or does he have some sort of problem causing this.He said it was a 300-v-6,fuel injected.Any ideas?Thanks.
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Joined: Jun 2003
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From: Cleveland, TN area.
I have a '91 Ford Explorer, 4.0L pushrod engine. The timing is not adjustabe except for a 4 degree spout that can be removed.
My truck doesn't like the regular. Has some sprark knock up a grade in overdrive. I know some knock is normal but this is more than that. I run the high octane to get the power and milage that I just can't get from regular and no knock.
Now, my truck was built for and sold in California and I think the computer is different. Even though the manual says it should run ok with all grades of gasoline it dosen't.
When I try different grades or even brands I will unhook the battery for at least 5 min. to reset the computer. Got to have a clean start.
Just my $.02.
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Tom
My truck doesn't like the regular. Has some sprark knock up a grade in overdrive. I know some knock is normal but this is more than that. I run the high octane to get the power and milage that I just can't get from regular and no knock.
Now, my truck was built for and sold in California and I think the computer is different. Even though the manual says it should run ok with all grades of gasoline it dosen't.
When I try different grades or even brands I will unhook the battery for at least 5 min. to reset the computer. Got to have a clean start.
Just my $.02.
_________________
Tom
Last edited by TomCarperNGiles; Mar 3, 2004 at 05:20 PM.
Thread Starter
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Postmaster
Joined: Dec 2003
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From: The County
Thanks Tom.I'm not sure where his was made.I find my vechicles all run better with the super in them.He never mentioned any thing about sparkknock,which I usually get with the lower grade of gas.The way his acted was just opposite of what mine act.I thought it was strange.I figured someone in this forum might have an idea on it.I appreciate the reply. thanks.
Postmaster
Joined: Dec 2001
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From: UT
I've heard of people whose engines ran worse on higher octane fuels. Personally, I can't tell a difference, so I run the lowest grade, since that's what the owner's manual calls for. Some say running a higher octane than what the engine is "tuned" for can increase carbon buildup (Octane is a measure of how well gasoline resists burning -- why lower octane fuel create "sprak knock" they burn quicker).
If you are getting spark knock on the 4.0 OHV on regular 87 octane gas, it's quite common, and there are several common (an inexpensive) fixes.
If you are getting spark knock on the 4.0 OHV on regular 87 octane gas, it's quite common, and there are several common (an inexpensive) fixes.
