A few weeks ago I had my truck in the shop due to an engine miss. They replaced the plugs, wires and fuel filter. The truck ran great for a few days and now it's doing the same thing again. The check engine light had come on before it went to the shop, but has'nt come on this time around. What could be the problem with it? One person told me it could be a bad catalytic converter and another says the EGR Valve could be bad. Any help would be greatly appreciated by me.
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2001 Ford Ranger Question: Engine Miss
Answer #1DaveJHM April 10, 2011, 00:23Master
The 3.0L V6 is also susceptible to having valve issues in the cylinder heads. This could cause a misfire without a check engine light.
Catalytic converter issues will typically cause a lack of power, not a misfire.
EGR Valve could cause a cold engine rough idle, but typically not a misfire.
As to why the engine ran well for a few days - not entirely sure. Certainly have the parts that were replaced rechecked for correct installation and quality.
Then, have a compression test performed - with a manual gauge. If/when you find a low cylinder, have a cylinder leak down test performed.