Check engine with high octane??

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Mar 8, 2004 | 12:45 PM

sty

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Joined: Mar 2003

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From: Hamilton Ontario

Check engine with high octane??

My `92 F150 302 , pings and check engine light comes on when I burn 91 or higher octane. When I burn regular unleaded the check engine light does not come on. Why would the higher octane fuel cause the light to come on? It still pings going up a hill burning regular unleaded. I recently towed our (my wifes` TT) and it would ping above 50 mph burning 91 octane. I was told carbon removal would fix this.

Any opinions?

Thanks in advance for the replies.

Sty

Mar 8, 2004 | 01:47 PM

RTM

Cargo Master

Joined: Dec 2003

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From: Sunny Florida

Have you checked the base timing yet?

Mar 8, 2004 | 03:15 PM

sty

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Senior User

Joined: Mar 2003

Posts: 140

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From: Hamilton Ontario

Adjustable?

Is the timing done by the EEC , or does the EEC adjust the timing from the "base"?

Thanks,
Sty

Mar 8, 2004 | 07:39 PM

RTM

Cargo Master

Joined: Dec 2003

Posts: 2,734

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From: Sunny Florida

It adjust it from the base timing which is 10 to 12 degrees. I have read some people running a little more base timing.

Mar 8, 2004 | 08:14 PM

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,555

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From: Concord, NC

I would pull the codes to see exactly why the check engine light is coming on. That should at least point you in the right direction. I would also check base timing.

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