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.
Engine Miss on 2001 Ford Ranger
by Visitor in Shelbyville, IL on April 09, 2011
ANSWER by DaveJHM on April 09, 2011
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.
The engine may misfire and/or buck while driving at freeway speeds with no fault code stored in the powertrain control module (PCM). This can be caused by an intermittent fault with the camshaft ...
1999 Ford Ranger 3.0L new plugs gapped correctly. began running rough at start up- after warm up ran well. Problem now much worse-wont run smooth- engine analysis says not firing 1 & 5. What should...
while driving at hiway speed tranny stopped and engine rpms revved up. i can turn the flexplate with my hand through the acess port. is this a tranny issue or flexplate issue?