Constant misfire

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Dec 16, 2007

pathfinder

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From: Butler, pa

Constant misfire

'92 Ranger developed a constant misfire at 45 mph when in high gear. Anyone have any ideas?

Dec 17, 2007

wydopnthrtl

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From: Ohio

So.. it sounds like you have a misfire under load? Can you reproduce this in a lower gear / heavy throttle?

If so.. I'd think you have a weak spark.

Rich

Dec 17, 2007

pathfinder

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From: Butler, pa

I did change plugs and wires whats next coil pack? Could it be in the computer?

Dec 17, 2007

graniteguy

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From: Texas

If it won't let you get over 45 mph it may be a clogged cat. I had that happen. It felt like a missfire and wouldn't let me get past a specific speed.