4.6 premaure spark issues

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Jun 4, 2012 | 09:56 PM

Franksporttrac

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4.6 premaure spark issues

have a 2007 sport trac with v-8. 92k check engine light comes up with premature spark, firing issues. Note light will go off for a couple of days after towing boat (4000 lbs with trailer) Dealer changed plugs at about 77k, coil has been replaced on noted cylinder. lifter that one side seems a little noisy.
Engine light started coming on intermittantly after spark plug change, but has been pretty much on with the exception of after towing, but comes back on after about 100 miles. I have been running synthetic since about 12k, can't quite figure this out. HELP emmision testing due soon

Jun 5, 2012 | 01:19 AM

aquanaut20

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From: BC Canada

The synthetic is OK.

What fuel are you using, Octane?

Sounds like you may have some pre-ignition! Carbon build up in cylinder or bad plugs (heat range)... Philip

Jun 5, 2012 | 06:16 AM

critterf1

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From: Newport, N.C.

What type/brand of plug was installed?

Jun 5, 2012 | 06:38 AM

shorod

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From: Cedar Rapids, IA

Is the code you are getting for a misfire (PO030x where 'x' is the cylinder number) or something different? I've not heard of a "premature spark" diagnostic code.

-Rod

Jun 5, 2012 | 10:11 AM

Franksporttrac

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codes

it is a misfire code, seems to run ok, but possibility of some mechanical noise (place screwdrive in that area you can feel something is off, like I said coil hads been replaced

Jun 5, 2012 | 10:47 AM