I have a 2004 Ford Ranger 3.0 V6 with about 80k miles on it. A few years ago, while I was idling, the check engine light started flashing and it started running rough. The RPMs lowered to about 800 and the needle was bouncing a bit. Ten seconds later it picked right back up.
This would happen sporadically but it became more and more constant until it would do this anytime I stopped the truck and idled. However, whenever I started driving the power would kick right back in. The problem only happened when I idled.
The check engine light eventually stayed on. I used a code reader and it had two--that the truck was misfiring under 1000 RPMs and that the #6 cylinder was misfiring.
I took it to a shop and they diagnosed it as a bad plug (their code said it was the #4 cylinder). I paid them to replace the plug, drove off the lot and at the first stop the truck started running rough again.
The shop wants to tear down the engine and I'm not able to have it registered until it passes smog--which it won't because the check engine light is on. Any ideas? I've changed plugs and wires and I've cleaned the air sensors.
have the same problem?
Wednesday, May 11th, 2011 AT 5:31 AM