2010 Ford Escape check engine light on. Replaced 4 spark plugs, light still on. Now what?

[BLS2753]

Usually, if you fix the problem, the CEL will go off on it's own after a couple of days of driving and engine start/stop cycles.

[BostonMike7]

Originally Posted by AlfredB1979

Work less harder.

Just pull the computer fuse in the underhood box and pop it back in a few minutes later. Seeing where some of those cables lead to in unibodies, I don't get why people do all those gymnastics over relatively nothing.

Some cars don't have a fuse for the EEC. I know my Infiniti does not.

Pulling the neg cable resets a lot of variables that the car has learned over hundreds of miles of driving. Shift points, timing curves, etc.


Best way to erase the code is a scanner. They are under $20 these days. No excuse not to have one if you do your own vehicle work.

[larrying]

i have a misfire 301 and 302 on a 2011 ford escape. the mechanic said plugs, coil whic we did twice. reset. still comes on and misses. next changed mass air flow sensor.reset. came back on and still missing. lost on what to do next.

[BostonMike7]

Originally Posted by larrying

i have a misfire 301 and 302 on a 2011 ford escape. the mechanic said plugs, coil whic we did twice. reset. still comes on and misses. next changed mass air flow sensor.reset. came back on and still missing. lost on what to do next.

Misfires are troubleshot by checking 4 things

Air - usually a blockage such as a rodent building a nest in the intake. Doesn't happen really all that often on a car regularly being driven.

Spark - plug and coil.

Fuel - Verify the injectors are firing and not clogged. Verify proper fuel pressure at the injectors

Compression - Check compression of each cylinder to ensure a head gasket hasn't blown.



With the plug and coil changed out, my next tast would be to check fuel pressure and injectors and then run a compression test. The last car I did this procedure to I discovered one cylinder had no compression and found a valve had actually cracked and was missing a huge chunk.