Mechanics

FUEL ISSUES

1999 Ford Explorer • 206,400 miles

Hello, the engine is knocking like it has an octane problem. Also, it has a really rough start when starting cold as well. It will start up fine when warmed up. It seems to have no driving issues although it seems like its runs rough when taking off. There is no check engine light and the fuel filter has been replaced. The injectors have also been cleaned. Any ideas?
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Rmoore09
July 14, 2012.




Also the MPG has not been affected.

Tiny
Rmoore09
Jul 14, 2012.
Take a fuel pressure measurement and post what you find.

Wrenchtech
Jul 14, 2012.
A quick thing to try is to remove and maf sensor and clean the thin wire with cleaner
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Djcl
Jul 15, 2012.

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