Mechanics

HELP! MY CAR IS MISS FIRING BAD

2000 Ford Focus • 860,000 miles

I have a 2000 ford focus. It starting having a lot of trouble. The car only has 66k miles on it. It was idleing hard shaking and running very rough. I friend said it might be the mass air flow sensor. So I Replaced that, still did it so I replaed the oxygen sensor and the coil pack. Now it idle 's a bit smoother but you hear a poping noise out of the tail pipe. And when I try to move I can push the pedal to the floor and I only go 5mph. I need some help. The check engine light is off so they said they cant pull a code
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Ferrisj96
November 3, 2011.




I would start with a compression test to see if something failed internally in one of the cylinders. The valve seats are common for failing in these units.

Thats where I would start before throwing anymore parts at it.

Roy



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