1999 Mazda Truck MISS FIRE

1999 MAZDA TRUCK

140,000 MILES • 6 CYL • 4WD • AUTOMATIC

HUNT

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Problem is truck is miss firieing on #3 cylinder, replaced coil plugs and wires and check compression and its good. After replacing coil plugs and wires still shows weak spark on #1,2,3 on the coil pack. Also haveing same troulble on a ford exploder.
Why would it show weak spark on one side of coil pack?

Mar 21, 2008 at 6:26 PM

MASTERTECHTIM

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4,750 POSTS

is it actually misfiring? when you say weak spark, what do you mean? does the misfire go away when driving?

Mar 21, 2008 at 7:04 PM

HUNT

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[quote:9999128796="mastertechtim"]is it actually misfiring? when you say weak spark, what do you mean? does the misfire go away when driving?[/quote:9999128796]

yes its actually misfiring, even when driving it is running rough. took a ignition firing tester that test spark through the wire. and it shows weak spark on the 123 and strong spark on 456.

thanks
jeff

Mar 22, 2008 at 4:43 PM